427 results about "Bleaching powder" patented technology

The wet combined fume desulfurizing and denitrifying process with chloric strong oxidant enhanced urea has the fume to be treated contacted sufficiently with the mixed absorbent liquid containing urea and chloric strong oxidant inside the absorbing reactor so as to eliminate NOx and SO2 through absorption before being exhausted. The chloric strong oxidant is sodium chlorite, sodium hypochlorite, bleaching powder or their mixture. The process has high denitrifying efficiency, high fume purifying effect, simple structure, easy operation and small occupied land. The said process can reach NOx eliminating rate of 75-98 % and desulfurizing efficiency over 95 %.

The invention discloses a lead-zinc floating recycling method from gold ore cyanation tailings, which comprises the following steps: (1) predisposing: adding water in the cyanation tailings; stirring to form ore paste; adding active carbon, Y0 agent, FeSO4+ammonium persulphate in the ore paste; (2) asynchronous mixing-selecting: sending the predisposed ore paste to the floater group I to proceed first roughing separation; adding Y0 agent, limestone, butyl airpotato yam to float galena; sending the tailings in the first roughing separation to floater group II; adding Y0 agent, limestone, cupric sulfate, butyl airpotato yam to float zincblende; (3) recycling and purifying tailing water: adding chlorinated lime in the tailing water to decompose CN- less than 0.5 mg per L; recycling the tailing water.

The invention relates to a method for cultivating organic green crab. Wherein, its cultivate water meets international standard as year temperature is 7-32Deg. C, salt density is 5-32, and bottom is mud or sand mud. And the invention selects the manual crab seed cultivated at organic cultivation or the natural crab seed; and it mixed cultivates the green crab with at least one of prawn, etc; it at least cultivates 2 times in one year; and the food is fresh natural biology, as acorn barnacle, oyster, etc, while the shelf feed amount is 20-35% of crab weight, and the fish feed amount is 6-12% of crab; and it uses burnt lime, bleaching powder to disinfect the substrate, and uses micro biological agent to improve the water quality.

A container for dry particulate material, such as tablets or pills, beans, cereals, coffee, sugar, fish food, fertilizer, bleach powder etc, which, when it is turned upside down, dispenses a customer defined volume amount of material, or a predefined number of pills (e.g., one pill at a time).

The innocent treating process of waste drilling mud includes the following steps: 1. adding industrial hydrochloric acid, sulfuric acid and / or oxalic acid into waste drilling mud through stirring in a mud pit to neutralize sodium hydroxide and sodium carbonate and complex metal ion; 2. adding oxidant bleaching powder, hydrogen peroxide and / or sodium hypochlorite through stirring to eliminate or reduce organic matter content, lower CODCr and chroma and eliminate sulfide; and 3. adding adsorbent polysodium silicate, aluminum sulfate, gypsum powder and / or magnesia through stirring to adsorb water, destroy emulsion balance of mud, alter mud performance, block outward penetration of pollutant and form solid. The present invention has relatively low treatment cost.

The invention relates to the water quality purification field, and especially relates to a method for purifying water quality; the method achieves a purpose of purifying the water quality by pond culture of Chinese mitten crab. The method for purifying the water quality includes the following steps: desilting and tidying a pond, namely carrying out desilting treatment on excessive silt in the crab pond; clearing and drying the pond, namely mixing quick lime, a bleaching powder and tea meal and clearing the pond; putting aristichthys nobilis and a first generation of freshwater shrimps in the middle ten days of February; putting crab seedlings in the first ten days of March; putting margarya melanoides before and after Tomb-sweeping Day in batches; harvesting the freshwater shrimps with a ground bamboo cage in the middle ten days and the last ten days of June; putting a second generation of freshwater shrimps in the first ten days of July; harvesting the crabs, the freshwater shrimps and the aristichthys nobilis from October to November; and during the culture process, carrying out fertilization water treatment and planting waterweeds in the crab pond. Through the intercropping breeding mode, aquatic products are cultured while the water quality is purified, and the obtained cultured river crabs have good quality.

The invention discloses a litopenaeus vannamei and fish mixed culturing ecological breeding method. A pond with brackish water is selected, during a slack winter season, spiral shell harm is removed, filiform algae are cultured in a directed mode, deposit phosphori in the pond bottom are adsorbed and removed, on around the Tomb-sweeping Day in spring, quick lime dry method pond poisoning is carried 20 days before culturing, 10 cm water adding is carried out before fry adding planning, bleaching powder is used for soaking a disinfecting tank bottom for 12 h, 80 cm water adding is carried out, after water adding is completed, oil tea cakes which are soaked by warm water for 24 h in advance are splashed, and organic fertilizer obtained through microbial fermentation is hung at the side of the pond. After water cultivating, young shrimps are subjected to out-of-cage breeding, after seven days, small-specification mixed-culturing fingerlings obtained after salinization are subjected to out-of-cage breeding, on the 35th day, large-specification mixed-culturing fingerlings are subjected to out-of-cage breeding, then the water level is deepened gradually, the water level is controlled to be 1.1 m-1.2 m, in the early period, feeding is carried out 2 times a day, in the medium-later period, feeding is carried out 3 times a day, computing is carried out according to 2%-8% of body weight, breeding is carried out for 80-100 days, and litopenaeus vannamei is harvested. Mixed fishes with the proper matched density are used for eliminating sick and weak shrimps, the infection source of sick shrimps is removed, prawn abnormal group swimming is avoided, sick shrimps are reduced, and the success rate of culturing is improved.

The invention discloses a method for producing industrial grade calcium chloride by taking calcium carbide slurry as raw material, comprising the following steps: firstly, the calcium carbide slurry and hydrochloric acid are reacted to produce calcium chloride, secondly, Fe<2+> produced by oxidation-reduction reaction is oxidized into Fe<3+> by bleaching powder, H2S produced in the reaction is partially removed, and then calcium carbonate and ammonium phosphate in NP residues are reacted with free hydrochloric acid, FeCl3 and MgCl2 in the reaction completion solution to produce calcium chloride, iron phosphate octahydrate and magnesium phosphate hexahydrate, calcium chloride thin slurry is subjected to sedimentation, rough filtration and fine filtration, so fine calcium chloride solution is obtained, the fine calcium chloride solution is subjected to evaporative concentration and granulation drying, so granular calcium chloride product is prepared, and finally, ferrous chloride solution containing sodium hydroxide is adopted to absorb hydrogen sulfide in the tail gas, and the tail gas is enabled to reach the treatment standard. According to the method for producing industrial grade calcium chloride by taking calcium carbide slurry as the raw material, wastes are treated by using wastes, the wastes are turned into useful things, and the serious pollution problem caused by calcium carbide slurry and by-product hydrochloric acid is radically solved, the benefit of environmental protection is very remarkable, the technological process is short, the product quality is good, and the economic benefit is high.

The invention discloses a wastewater centralized treatment system and method for toilet wastewater collectors of high-speed railway passenger cars, and belongs to the technical field of wastewater treatment. A rotating drum grille is used for removing toilet paper and bulk manure in wastewater of the toilet wastewater collectors; a pretreatment regulation pool is arranged and bleaching powder is added for removing a part of ammonia nitrogen and suspended matters in wastewater, and the water quality and water quantity can be regulated; an internal circulation micro oxygen reactor is arranged for receiving 2 / 3 wastewater of the toilet wastewater collectors, 100 to 150-mesh micro electrolysis catalytic carrier particles are added, and shortcut nitrification can be realized through granular sludge; an internal circulation anaerobic reactor is used for removing a part of ammonia nitrogen and nitrate nitrogen; a double-circulation aerobic reactor is arranged for realizing simultaneous nitrification and nitrogen removal by denitrification of aerobic granular sludge; a special nitrogen removal aerated filter is arranged, and advanced treatment of wastewater is realized by using a micro electrolysis catalytic biological carrier; and then treated water is disinfected through ClO2 to achieve standardized discharge.

The present invention relates to a solid chemical pipe cleaning agent and its preparation method. It is characterized by that it is formed from 52-68% of granular sodium hydroxide, 11-19% of sodium carbonate, 15-21% of high test bleaching powder, 4-10% of sodium dodecyl benzene sulfonate and 0.02% of essence. Said invention has no need of adding metal aluminium, can obtain good cleaning effect, and can be used for killing pathogenic bacteria and insect eggs. Said invention also provides its preparation method and production steps.

The invention relates to a dephosphorization method of phosphorus-containing waste water. The invention provides a dephosphorization method of the phosphorus-containing waste water, which can remove inorganic phosphorus and organic phosphorus and has low cost of equipment and raw materials. The invention adopts bleaching liquor or bleaching powder to remove total phosphorus; free chlorine released by the bleaching liquor or the bleaching powder combines with phosphorus atoms to cause organic phosphine to be converted into phosphate radical or hypophosphite; calcium ions in the bleaching liquor or the bleaching powder react with the phosphate radical or the hypophosphite to generate sediment and then are removed; and the inorganic phosphorus and the organic phosphorus are removed together. The method of the invention has simple equipment, small investment, greatly reduces the cost investment of treatment facilities, has low cost and easy acquisition for the bleaching liquor or the bleaching powder, and is easy to be popularized and used; in addition, the sediment taking calcium phosphate as the main component can be used as the raw material for producing phosphatic fertilizers in phosphate fertilizer plants.

The invention discloses a method for cultivating dendrobium officinale. Problems can be solved by the aid of the method. The method includes accurately restricting the diameters of meshes on plastic plain nets on planting frames; combining processes for laying substrates with one another; irrigating a large quantity of water on the dendrobium officinale at least once every month from March to November every year by the aid of core technologies. Water irrigation time in each procedure is 30-50 minutes. The water is irrigated on the dendrobium officinale until water which flows out of the dendrobium officinale is clear water, and is required to be spring water without bleaching powder. Owing to a technical means, the method has the advantages that the growth speeds and the yield of the dendrobium officinale can be greatly increased, and the problem of rotted roots can be solved.

The invention relates to a method for separating cadmium, lead, chromium, arsenic and mercury in paddy field soil, which belongs to the technical field of agriculture soil restoration. The method employs a degumming agent and a polymerization displacement agent, the method comprises the following steps: 1)sampling soil in field; 2)analyzing oil sample; 3)weeding and immersing; 4)activating; 5)displacing and absorbing; 6)stirring; finally collecting through concentration to reach the purpose of separating and detoxifying. According to the invention, source of harmful heavy metal in paddy field can be eliminated at large limitation, so that problem of secondary dissolving of deposition formed by a lime emulsification method and a bleaching powder oxidation process can be avoided.

The invention provides a disease comprehensive prevention and control method for greenhouse-cultured penaeus vannamei. The disease comprehensive prevention and control method for the greenhouse-cultured penaeus vannamei is characterized by comprising the following steps: 1, water body regulation and control: (1), matching one culture pond with one disinfection tank, and disinfecting culture water by a bleaching powder, wherein the disinfected culture water can be used after three days; (2), properly irrigating the culture water to the culture pond before putting young shrimps, splashing bacillus preparations and effective microorganisms (EMs) over the whole culture pond, and putting the young shrimps into the culture pond after three days, wherein the bacillus preparations are activated by brown sugar, and the EMs are subjected to fermentation culture by utilizing aerated water of the disinfection tank; (3), no needing of discharging wastewater within 20-40 days before culturing, only adding water once at every three days, and adding the bacillus preparations and the seawater-cultured EMs at every six days; (4) starting discharging a small amount of wastewater once at the morning and the afternoon of every day after culturing for 20-40 days, changing the water once at every three days, and the like; 2, feed management: (1), ensuring the fact that the feeding frequency is different according to different culture time; (2), adding shrimp and crab nutrients, immune polysaccharides and rice vinegar to the fed feed after culturing for 30 days; (3), controlling the feeding amount after the total feeding amount per mu at every day is stable; 3, emergency processing and the like. According to the disease comprehensive prevention and control method for the greenhouse-cultured penaeus vannamei, the explosion of shrimp diseases can be prevented, and the survival rate and the growth rate of penaeus in the culture procedure can also be remarkably increased.

The invention discloses a material circulating system formed in the chlor-alkali industry by using waste carbide slags and chlorine water. The system is specifically as follows: after being preprocessed, the waste carbide slags react with hydrochloric acid and the reactant is filtered to obtain calcium chloride solution; the filtrate and sodium hydroxide generated in electrolysis in chlor-alkali plants generate high-purity calcium hydroxide; bleaching powder concentrate is produced after the calcium hydroxide is chloridized, centrifuged, dried and broken; filter cakes react with the hydrochloric acid to produce active carbon; calcium chloride generated in the reaction can be produced into calcium chloride dehydrate and calcium chloride anhydrous; after being processed, sodium chloride serves as a raw material for electrolysis. The system effectively solves the processing and disposal problems of the waste hydrated limes and the raw material problems in the chlor-alkali industry, embodies the circular economy, produces the byproducts including the bleaching powder concentrate and the active carbon and the products including the calcium chloride dehydrate and the calcium chloride anhydrous and improves the deep processing capabilities of the enterprises.

The invention discloses a water treatment method for oxidation algae removal with high-activity singlet oxygen, and relates to methods for algae removal. The problems that in a pre-oxidization (chlorine and ozone) algae removal method, equipment needs to be additionally arranged, the operation is complex, and poisonous and harmful by-products are easily produced are solved. The water treatment method for the oxidation algae removal comprises the steps that solid bleaching powder and inorganic solid peroxide are added to water with algae, stirring is carried out, and coagulation, precipitation, filtration and disinfection are carried out in sequence. Hypochlorite ions provided by the bleaching powder in the method for the algae removal fast react with hydrogen peroxide released after the peroxide is dissolved in water to generate the high-activity singlet oxygen, algae cells can be fast killed, algae inactivation is achieved, and the aim of the algae removal is achieved. The high-activity singlet oxygen can be directly added for use as a solid reagent, equipment does not need to be additionally arranged, the operation is simple and easy to carry out, transport and storage are convenient, the poisonous and harmful by-products are not produced, and the method can be applied to water plants in a large scale and is more suitable for emergency treatment in the algae large-scale bloom process.

The invention discloses a culturing method for odontobutis obscuras, comprising the following steps of: arranging a fishpond: selecting a pond, arranging a fish nest in the pond, and cleaning and sterilizing the fishpond by using quick lime or bleaching powder; putting fish fries into the fishpond: putting preliminarily acclimated and cultured fish fires of odontobutis obscuras into the fishpond, and meanwhile, and putting river prawn, spotted silver carps and silver carps into the fishpond to carry out mixed culture; and breeding: breeding by using feeds with the protein contents of 35-40% for 10 months to obtain the odontobutis obscuras. By using the method provided by the invention, the culturing survival rate of the odontobutis obscuras is increased; in addition, the fish fries are bred by using a pellet feed, so that the culturing cost is reduced, the income of an aquatic product culturing farmer is increased, and the industrial development prospect of the odontobutis obscuras is wide.

The Kuimai picture making process includes the following steps: 1. drying Kuimai straw in the sun, fumigating with sulfur and bleaching in oxalic acid solution; 2. dyeing in hot basic dye solution after washing; 3. washing, soaking in solution of sulfurous acid and oxalic acid, washing, soaking in hot sodium pyrophosphate solution, washing and bleaching in hot bleaching powder solution; 4. dyeing in hot basic dye solution after washing; 5. ironing to flatten at regulated temperature for reaching required color depth; 6. cutting based on the requirement of the pattern; and 7. collaging into Kuimai picture. The present invention has expanded making range of handicraft.

The invention discloses a method for cleaning membrane pollution with high-activity singlet oxygen, and relates to methods for cleaning membranes. The method for cleaning the membrane pollution with the high-activity singlet oxygen comprises the steps that solid bleaching powder and inorganic solid peroxide are added to a pool with a polluted membrane component, and the polluted membrane component is stirred, soaked and then bleached. The peroxide is calcium peroxide, magnesium peroxide, barium peroxide, sodium percarbonate and potassium percarbonate. Hypochlorite ions provided by the bleaching powder in the method for cleaning a membrane fast react with hydrogen peroxide released after the peroxide is dissolved in water to generate the high-activity singlet oxygen, the high-activity singlet oxygen directly acts on biological cells with the membrane pollution, the enzymatic structure is fast damaged, and the membrane cleaning effect is good. The high-activity singlet oxygen is an environment-friendly reagent, poisonous and harmful by-products cannot be generated in the cleaning process, and waste liquid can be directly discharged after the cleaning. The high-activity singlet oxygen can be directly added for use as a solid reagent, equipment does not need to be additionally arranged, the operation is simple and easy to carry out, the agents are convenient to transport and store, the price is low, and the agents are easy to obtain.

The invention belongs to the technical field of articles of daily use, and more specifically relates to a toilet cleaning agent. The toilet cleaning agent comprises following raw materials, by weight, 10 to 20 parts of a bleaching powder, 8 to 12 parts of alkyl glycoside, 6 to 10 parts of hydrogen peroxide, 6 to 10 parts of a surfactant, 4 to 8 parts of sodium tripolyphosphate, 5 to 10 parts of tea seed powder, 5 to 10 parts of algal polysaccharide, 1 to 5 parts of a phosphating solution, and 80 to 120 parts of deionized water. The formula of the toilet cleaning agent is reasonable; removing performance on urine alkali stain is excellent; decontamination effect is excellent; acidity is low, the toilet cleaning agent contains no corrosive ingredient, corrosivity on closestools and sewer tunnels is low, and corrosion resistance of closestools and sewer tunnels is improved; cleaning process is simple; the toilet cleaning agent is convenient to use, and is high in working efficiency; a preparation method is simple; raw material cost is low; the toilet cleaning agent is not harmful to hands and skin, and is friendly to the environment; and environmental pollution is not caused.

The invention discloses a purified water production technology, which belongs to the field of water purification. The purified water production technology comprises a heating boiling step, wherein boiling time is 3-30min. The process of the purified water production technology does not use alums, chlorine, bleaching powder and the like, so that purified water does not threaten the body health of people. In addition, the technology disclosed by the invention adopts the heating boiling way, on one hand, a sterilization function is performed, and on the other hand, plain boiled water is obtained and is safe, nontoxic and beneficial for the body health.

The invention discloses a material circulating system formed by waste acetylene sludge and the chlor-alkali industry. The system comprises: pretreated waste acetylene sludge is reacted with hydrochloric acid, the reaction product is filtered to obtain a calcium chloride solution; the filtrate is reacted with sodium hydroxide generated by electrolysis of a chlor-alkali factory to generate high-purity calvital; the calvital is chloridized, centrifugated, dried and crushed to prepare bleaching powder; and filter cakes are reacted with the hydrochloric acid to generate active carbon. The calcium chloride generated in the reaction can be prepared into calcium chloride dihydrate and anhydrous calcium chloride; and sodium chloride after treatment can be taken as a raw material for electrolysis. The material circulating system effectively solves the problem of treating the waste acetylene sludge and raw material problem in the chlor-alkali industry, embodies recycling economy; and byproducts of the bleaching powder and the active carbon and calcium chloride dihydrate products improve deep processing capacity of an enterprise.

The invention discloses a domestic wastewater rapid treatment device utilizing ultraviolet ray sterilization. The domestic wastewater rapid treatment device utilizing ultraviolet ray sterilization comprises a tank body and a sedimentation tank, wherein the upper part of the tank body is fixedly provided with two filtering plates the outer diameters of which are adaptive to the inner diameter of the tank body; the two filtering plates are in semispherical structures; the openings of the semispherical filtering plates are formed upward, and a filter core made of a fiber ball filter material is arranged between the two filtering plates; the outer side wall of the tank body is provided with a water intake pipe positioned above the filtering plates; an ultraviolet ray light emitting body is arranged in the middle of the tank body; a stirrer is arranged at the lower part of the tank body; the side wall of the lower part of the tank body is provided with a bleaching powder injection opening; the sedimentation tank is communicated with the lower part of the tank body. The domestic wastewater rapid treatment device utilizing ultraviolet ray sterilization, which is provided by the invention, can rapidly kill bacteria in wastewater rapidly so as to achieve the aim of treating wastewater rapidly.

The invention relates to a rotary kiln production method and equipment for a bleaching powder product. The production method is characterized by comprising the following steps: pouring slaked lime into a rotary kiln with inclination during a chlorination process of slaked lime and chlorine, continuously winnowing and spreading slaked lime through a plurality of winnowing plates arranged in the rotary kiln and capable of rotating along with the rotary kiln so that the slaked lime and refluent chlorine are fully contacted and chlorinated, wherein the adopted rotary kiln is a cylinder with two closed ends and can axially rotate, a feed inlet is formed in one end of the rotary kiln, a discharge outlet and a chlorine inflation inlet are formed in the other end of the rotary kiln, the cylinder has a gradient as a whole, and a plurality of L-shaped winnowing plates which are axially arranged and have bends are evenly arranged on the inner wall of the cylinder. The defects and deficiencies of the traditional central screw chlorination technology can be fundamentally overcome, the technological process and the adopted equipment are simpler, the chlorination effect is better, the products have higher quality and are energy-saving and environment-friendly, and the rejection rate of products and the production, installation, and maintenance costs of equipment can be greatly lowered.

The invention relates to a freshwater fish pollution-free green cultivation method which includes the following steps: step 1 is that a pond is cleaned in early days of April, and bleaching powder is used to disinfect the pond bottom of the fishpond; step 2 is that fish fries are placed into the fishpond when water temperature reaches 10 DEG C -12 DEG C, a mixed breeding method is adopted in the fish fries, and various fish fries are disinfected by disinfectant before release; step 3 is feeding fish feed, and the amount of fish feed is 2% of the amount of the fish fries; step 4 is that water in the fishpond is disinfected and insects in the water are killed; and step 5 is that disinfecting and insect killing are carried out once each month and new water is injected once each month since May, one third of water in the fishpond is replaced each time until October, and then adult fish can be caught. By means of the mixing breeding method, the freshwater fish pollution-free green cultivation method improves breeding efficiency and disease prevention and disease resistance abilities between various fishes at the same time, and promotes health of the fish.

The invention discloses a water treatment compound agent for removing organic pollutants in an oxidation mode with high-activity singlet oxygen and a water treatment method of the water treatment compound agent, and relates to water treatment agents and methods for removing pollution in oxidation modes. The problems that when the singlet oxygen is produced through a photosensitization method, a light source needs to be added, secondary pollution is generated, and the use efficiency of the singlet oxygen in a chemical method is low are solved. The water treatment compound agent is composed of bleaching powder, inorganic solid peroxide and powdered activated carbon, and the mass ratio of the bleaching powder to the inorganic solid peroxide to the powdered activated carbon is (1-10):1(1-10). According to the water treatment compound agent, hypochlorite ions provided by the bleaching powder reacts with hydrogen peroxide slowly released after the peroxide is dissolved in water to generate the high-activity singlet oxygen, and through a micro-interface provided by the powdered activated carbon, the self-decomposition of the singlet oxygen can be restrained, the survival time of the singlet oxygen can be prolonged, and the use ratio of the singlet oxygen is improved. The water treatment compound agent is high in efficiency of removing the organic pollutants in the oxidation mode, cannot generate poisonous and harmful by-products, and is convenient to transport and store and more suitable for emergency treatment.

A method for cultivating green crabs for two harvests in one year relates to an aquiculture method, which provides a method for cultivating green crabs with two harvests in one year. The first harvest begins to stock spring seedlings from the last ten days of February to the first ten day of March, and harvests in September or October of the same year after cultivating; or the first harvest begins to stock summer seedling in May or June, and harvests in October or November of the same year after cultivating. The second harvest begins to stock autumn seedlings from September to November, and harvests from February to May of the next year after cultivating. The method includes: pool cleaning: cleaning the pool before stocking with one of quicklime and bleaching powder, etc.; water quality: dissolving at least 3mg of oxygen in each L of water with a water temperature of 18 to 25 DEG C, a salinity of 10 to 30, a pH value of 8.0 to 8.5 and a diaphaneity of 20 to 25cm; stocking density: 1000-2000 / mu for the spring or summer seedlings and 3000-5000 / mu for the autumn seedlings; the baits are fresh baits of small and miscellaneous fish and shrimp and low cost shellfish, etc., and are grounded twice a day in the morning or in the afternoon.

The invention discloses an in-situ remediation method for cyanide-containing contaminated soil and underground water. The method includes the following steps that lime and bleaching powder or sodium hypochlorite is used as a permeable reactive barrier medium under the indoor temperature condition; and according to the cyanide content in the soil and underground water and the thickness of the cyanide-containing contaminated soil, a continuous channel is adopted for conducting in-situ remediation on the cyanide-containing contaminated soil and underground water. The in-situ remediation method for the cyanide-containing contaminated soil and underground water has the advantages that the technological process is simple, implementation is easy, the applied range is wide, cost is low and efficiency is high; and remediation of the cyanide-containing contaminated soil and underground water can achieve good social benefits and ecological benefits.

The invention discloses a method for preparing bleaching powder and anhydrous calcium chloride by utilizing carbide slags to treat chlorine water. The main technical proposal of the invention is as follows: utilizing hydrated lime and the chlorine water in the chlor-alkali industry for slow chemical reaction, carrying out filtration to obtain filter cakes and then carrying out drying and crushing to obtain the finished product of bleaching powder; carrying out vacuum distillation on filter liquor to obtain the finished product of anhydrous calcium chloride. The method thoroughly eliminates the pollution of the waste chlorine water in the chlor-alkali industry and simultaneously creates certain economic benefits for the enterprises.

The invention discloses a preparation method of asphalt modified by waste tire rubber powder, and belongs to the technical field of modified asphalt preparation. The preparation method comprises the steps that firstly, asphalt is molten and subjected to a substitution reaction with chlorine under ultraviolet light catalysis; secondly, a reaction product reacts with a sodium hydroxide solution, so that active groups are generated on the surface of the asphalt; thirdly, the waste tire rubber powder and bleaching powder are mixed with deionized water to generate an oxidation reaction, and a large number of active groups are generated on the surface of the rubber powder; fourthly, the activated asphalt and the rubber powder are mixed to react, and sulphur is added to serve as a stabilizing agent; lastly, extrusion molding is conducted, and then the asphalt modified by the waste tire rubber powder is obtained. According to the preparation method, the preparation steps are simple; the rubber powder and the asphalt are activated, so that the active groups are generated on the surface of the asphalt; the rubber powder and the asphalt are chemically bonded in the preparing process, the compatibility is good, uniform dispersion is achieved, and no segregation phenomenon is generated between the rubber powder and the asphalt.