218 results about "Calcium Chloride Dihydrate" patented technology

The invention relates to a compound chloride-based environment-friendly snowmelt agent, which comprises a main component of a chloride mixture of calcium chloride dihydrate and magnesium chloride hexahydrate, contains various additives of sodium citrate, disodium hydrogen phosphate, sodium metasilicate, urea and the like and can contain abscisic acid or indoleacetic acid or a mixture thereof, sodium tartrate, humic acid or a salt thereof. The snowmelt agent in the invention can reduce the corrosivity to a metal object and a concrete structure effectively, improves the anti-salinization capabilities of a seed, a plant and soil, can be used when the temperature is as low as -25 DEG C, and solves the problems of bad snow melting effect caused by an autologous freezing point characteristic when a sodium chloride-based snowmelt agent is used and high cost caused by using an anhydrous calcium chloride-based snowmelt agent under the condition. The invention also provides a use method of the snowmelt agent, which places the main component and each additive separately without preparing a finished product of the snowmelt agent in advance and compounds the snowmelt agent on the spot before using. The method can avoid the problems of wetting, hardening and the like of the finished product of the snowmelt agent in the processes of storing and transporting, can avoid the defects of high-temperature energy consumption in the process of preparing compound granules (such as coating and granulating) and the capability of causing decomposition of the additives, has simple operations and a low cost, and is particularly suitable for on-site mechanical shed work.

The invention discloses a method for removing SO2 by utilizing soda ash waste liquid and carbide waste slag. CaCl2 in the soda ash waste liquid is utilized to react with the SO2 in flue gas, white CaSO3 settlement is generated, HCl is released and dissolved in water to form hydrochloric acid with very low concentration; Ca(OH)2 in the carbide waste slag is used for neutralizing HCl and generating CaCl2 and water, and CaCl2 is recycled. The desulphurization process mainly consumes Ca(OH)2 in the carbide waste slag. If no local soda ash waste liquid, calcium chloride dehydrate (CaCl2*2HO) produced by the soda ash waste liquid can be purchased for preparing CaCl2 solution. The carbide waste slag can be replaced by lime. The process is characterized by one high, two low and three points of environmental protection. The process firstly has high desulphurization rate, secondly has low fixed-asset investment and low running costs and thirdly utilizes the waste liquid and the waste slag to reduce the environmental pollution. Compared with all prior desulphurization processes, the process has great advantages.

The invention belongs to the field of gas drying, and provides a drying agent. The drying agent comprises 1-5 parts by weight of anhydrous calcium chloride, 0-8 parts by weight of calcium chloride dihydrate, 1-5 parts by weight of polyacrylamide and 0-1 part by weight of vegetable starch by weight. The drying agent provided by the invention adopts an organic macromolecule component, and is low in raw material cost; higher hygroscopicity can be obtained and can be up to over 400% through the structural characteristics of macromolecules; the drying agent is long in effective time; no liquid water oozes.

The invention discloses an improved drying agent. The improved drying agent is prepared from the following raw materials in parts by weight: 4-8 parts of polyacrylamide, 5-20 parts of bentonite, 8-16 parts of silica gel, 3-7 parts of plant starch, 7-10 parts of calcium chloride dihydrate, 3-6 parts of lime powder, 2-6 parts of anhydrous calcium chloride, 3-15 parts of bamboo charcoal powder, 5-15 parts of refined iron powder, 5-10 parts of high water-absorbent resin, 6-11 parts of refined manganese dioxide, 5-10 parts of quick lime, 2-7 parts of calcium propionate, 7-13 parts of magnesium sulfate, 4-18 parts of attapulgite and 5-11 parts of calcium sulfate. The improved drying agent disclosed by the invention can be used for improving the moisture absorption capacity, is long in valid time and high in drying speed, and is not easy to cause a water return phenomenon.

The invention relates to a sodium alginate and calcium ion modified charcoal composite material as well as a preparation method and application thereof. The composite material is prepared by modifyingthe surface of charcoal serving as a matrix through calcium chloride dehydrate and sodium alginate. The preparation method comprises the following steps: based on a preparation order, mixing biomasspowder with calcium chloride dehydrate in a solution, thus obtaining a calcium ion loaded biomass, then performing pyrolysis to obtain calcium ion-loaded charcoal, and obtaining the product through crosslinking reaction of the sodium alginate and calcium ions. The sodium alginate-calcium ion-modified charcoal composite material disclosed by the invention has the characteristics of rich raw materials, low preparation cost, large number of adsorption sites, large adsorption amount, zero secondary pollution and the like, and is relatively high in lead ion removal efficiency.

The invention belongs to the field of snow melting and deicing and particularly relates to an efficient-corrosion-inhibition compound chloride salt type snow-melting agent and a preparation method thereof. The efficient-corrosion-inhibition compound chloride salt type snow-melting agent comprises sodium chloride, calcium chloride dihydrate, a corrosion inhibitor and auxiliaries, wherein the corrosion inhibitor comprises sodium hexametaphosphate, sodium molybdate, sodium benzoate, sodium gluconate, zinc dihydrogen phosphate, sodium tartrate, sodium tripolyphosphate, sodium silicate, sodium lignin sulfonate, sodium citrate, benzotrizaole and thiourea; the auxiliaries comprise sodium carboxymethyl cellulose, urea and povidone. The efficient-corrosion-inhibition compound chloride salt type snow-melting agent which is granular solid has the advantages that the snow-melting agent is suitable for large-scale mechanical throwing operation and excellent in corrosion inhibition effect, and the deicing and snow melting ability of the snow-melting agent can be brought into full play in aspects such as city and rural roads, highways, rail transit, airports, squares, courtyards and bridges.

A method for recovering triethylamine from triethylamine hydrochloride aqueous solution comprises allowing calcium oxide and the triethylamine hydrochloride to react, and distilling at 50-150 DEC C to obtain the triethylamine; adding the calcium oxide into the collected triethylamine, refluxing under heating to remove water, and distilling to collect the triethylamine having water content smaller than 0.5%, distilling to obtain the triethylamine, separating solid from a turbid aqueous solution residual in a reaction kettle, adjusting the pH value of the aqueous solution to 7 with hydrochloric acid, and removing water to respectively obtain calcium chloride hexahydrate, calcium chloride dehydrate and anhydrous calcium chloride; and allowing the calcium oxide after drying the triethylamine and the triethylamine hydrochloride to react to obtain the triethylamine. Compared with the prior method for recovering the triethylamine from the triethylamine hydrochloride aqueous solution, the method has the advantages of simple operation, low price, high recovery rate, and no three wastes discharge.

The invention discloses a flow cytometry-based sperm acrosome reaction detection reagent which comprises acrosome reaction induction fluid and staining fluid, as well as sperm capacitation fluid, the pH value of the sperm capacitation fluid is 7.0-7.8, the sperm capacitation fluid contains sodium chloride, potassium dihydrogen phosphate, glucose, potassium chloride, magnesium sulfate heptahydrate, calcium chloride dehydrate, N-2-piperazine-N-2-ethanesulfonic acid disodium salt, sodium bicarbonate, sodium acetone, bovine serum albumin, and sodium lactate solution, the sperm capacitation fluid replaces the current sperm culture fluid, so that the capacitation effect is good and the induction is facilitated; the sperm acrosome reaction can be detected by using flow cytometry, and the flow cytometry-based sperm acrosome reaction detection reagent is accurate in the sperm acrosome reaction detection result, stable and reliable, good in repeatability, and clinically easily popularized.

The invention belongs to the field of rapid propagation and tissue culture method of plant, more particularly relates to a culture medium of Prunus serrulata Lindl. and a method of rapid propagation and tissue culture. The culture medium consists of a large number of elements, micro elements, ferric salt, organic components, sycrose, agar and a plant growth regulating agent, a large number of elements thereof comprise: ammonium nitrate, potassium sulfate, monopotassium phosphate, magnesium sulfate heptahydrate, calcium nitrate tetrahydrate and calcium chloride dehydrate; the ferric salt thereof comprises: ferrous sulfate heptahydrate and dihydrate sodium ethylene diamine tetracetate; the plant growth regulating agent is 6-benzyladenine and has concentration of 0.5-1.0 milligram / liter; other components are the same as MS culture medium. The pH value of the culture medium is 5.6-5.8. The culture medium of rapid propagation and tissue culture and the method of rapid propagation and tissue culture, provided by the invention, are simple, convenient and easily feasible aiming at characteristics of Prunus serrulata Lindl.. The tissue culture seedling is free from malformation, elongated in internode, enhanced in propagation coefficient, short in propagation period, which is about 50 days, good in culture effect and high in survival rate.

The invention relates to a method for producing calcium chloride dihydrate, which is characterized by comprising the following steps: putting hydrochloric acid (31%) and limestone powder into a reaction vat according to the mixture ratio of 2.2:1, and stirring for reaction to generate an acid calcium chloride solution; transferring the obtained solution into a clarification tank, adding lime emulsion, regulating the pH value of the solution to 8.9-9 to precipitate out iron hydroxide and magnesium hydroxide; and transferring filtrate into an evaporation dish after clarifying and filtering, heating to the temperature of 172-174 DEG C, evaporating, drying and dewatering at the temperature of 200-240 DEG C after crystallizing and separating, to obtain the calcium chloride dihydrate. The invention has the following advantages of no pollution, high recovery rate and product cost reduction.

A nutrient solution for rejuvenating trees in gardens is a nutrient solution, containing macroelements, trace elements, organic substances, physiologically active substances and exogenous hormones required for the growth of plants, prepared from ammonium nitrate, potassium nitrate, urea, magnesium sulfate heptahydrate, potassium dihydrogen phosphate, calcium nitrate, calcium chloride dihydrate, sucrose, ferrous sulfate heptahydrate, disodium ethylenediaminetetraacetate, zinc sulfate, copper sulfate, manganese sulfate tetrahydrate, sodium chloride, boric acid, vitamin A, vitamin C, vitamin B1,vitamin B6, humic acid, naphthaleneacetic acid, indolebutyric acid, 6-benzyladenine and gibberellin. The nutrient solution for rejuvenating trees in gardens can improve the survival rate of transplanted trees and promote and accelerate the self-recovering ability of nursery plants in order to make the nursery plants reach an expected landscape effect. The nutrient solution has a good rejuvenatingeffect on famous and old trees planted for many years and having poor growth vigor, and can enhance the resistance, break the dormancy, promote the germination of new shoots and new sprouts and delayaging.

The invention provides a production technology of recovering a glycine acid-binding agent triethylamine employing a triethylamine method. An industrial calcium chloride product can be coproduced. The production technology comprises the following steps: washing a triethylamine hydrochloride crystalline solid by using an aqueous solution to remove impurities; dissolving the washed triethylamine hydrochloride crystal into water; adding calcium hydroxide or calcium oxide, adjusting the PH value to 10-12, so as to obtain a calcium chloride layered solution with a triethylamine layer; separating out a crude product triethylamine, and dewatering and standing to obtain qualified triethylamine; pumping a calcium chloride solution into an evaporation device for evaporation concentration, and recycling condensate containing triethylamine to dissolve washed triethylamine hydrochloride; adjusting the PH value of the residual calcium chloride solution to 7.5-9 with hydrochloric acid, and then feeding to an evaporator to evaporate; cooling and crystallizing, filtering and drying at about 200 DEG C, so as to obtain a calcium chloride dihydrate product; adding concentrated sulfuric acid and urea to a washing solution to process, so as to respectively obtain calcium sulfate, hydrochloric acid and a chemical fertilizer material product.

The present invention relates to a comprehensive utilization method of bittern. Said method uses bittern as raw material and adopts the following steps: making the bittern undergo the processes of mixing reaction with calcium liquor, synthesis reaction with lime cream, evaporation concentration crystallization, four-step evaporation, aerifying chlorine, filtering and removing impurity and solid-liquid separation, etc, so as to make the bittern into several products of hemi-hydrate calcium sulfate, magnesium hydroxide, industrial salt, potassium chloride, industrial bromine and dehydrate calcium chloride.

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 provides an in vitro culture medium for culturing human embryos, and a preparation method of the in vitro culture medium, belonging to the field of human assisted reproduction. The in vitro culture medium is mainly prepared from the following components: 0.01-0.05g / L of gentamicin sulfate, 0.005-0.01g / L of phenol red, 0-0.01mM / L of disodium ethylenediaminetetraacetate, 90-116mM / L ofsodium chloride, 2.5-10.0 mM / L of potassium chloride, 0-1.8 mM / L of calcium chloride dihydrate, 0-7.16 mM / L of potassium dihydrogen phosphate, 0.2-1.51M / L of magnesium sulfate dihydrate, 20-25 mM / L of sodium bicarbonate, 0.1-7.27 mM / L of sodium pyruvate, 0-20 mM / L of sodium lactate, 0-3.25 mM / L of glucose, 0-1.0 mM / L of sodium citrate, 0-1.0mM / L of L-alanyl-L-glutamine, 0-2.7mM / L of inositol, 0.05-5mM / L of taurine, 5g / L of human serum protein, essential amino acids and non-essential amino acids.

The invention discloses a growth retardant treatment based potted drumstick tree dwarfing and fertilizing method. The method comprises the following steps of: selecting full and non-moth-eaten drumstick tree seeds, putting the drumstick tree seeds in an illumination incubator to undergo primary culture, according to different growth periods of drumstick trees, taking peat soil, perlite and vermiculite as matrices, applying a nutrient solution and reasonably controlling water and carrying out composite foliage spray and root application by using growth retardants including paclobutrazol and chlormequat chloride, wherein the nutrient solution contains potassium nitrate, ammonium nitrate, magnesium sulfate heptahydrate, monopotassium phosphate and calcium chloride dehydrate. The problems that the branches and trunk of the potted drumstick trees are single and too high and are easy to fall, the branches and leaves are scarce and are easy to fall off, the leaves are small and are easy to fall and the leaves are a bit yellow are effectively solved by adopting the growth retardants and the fertilizing method.

The invention belongs to the technical field of treatment and utilization of chemical 'three wastes', in particular to a method for co-production of raw gypsum in the preparation of Yengsu calcium chloride dihydrate by phosphogypsum. In the main technical scheme, phosphogypsum is purified and synthesized to obtain mixed solution of calcium chloride and calcium sulfate, a crystal calcium chloride dihydrate product can be obtained through distillation, washing, crushing and packaging of calcium chloride, and a white raw gypsum product can be obtained through washing, dehydrating, drying, crushing and packaging of the filter cake. The invention has the advantages of low production cost, high profit, large market demand and simple process and production equipment, and is a practical method for treatment and utilization. Moreover, the invention not only needs low investment, but also can create considerable economic value, eliminate the chemical waste residues, and protect the environment.

The invention discloses a three-dimensional network-like chitosan-calcium carbonate nano composite material as well as a preparation method and cell compatibility thereof. In the preparation method, the chitosan-calcium carbonate nano composite material is prepared by taking chitosan as a carbon source, calcium chloride dehydrate, ammonium bicarbonate and secondary distilled water as raw materials on the surface of stainless steel by virtue of a one-step coelectrodeposition method. The biocompatibility of the chitosan-calcium carbonate network-like nano composite structure is studied by virtue of in-vitro cell culture. The electrodeposition method is simple and controllable; and the chitosan-calcium carbonate fibrous network-like structure is firmly combined with a substrate, and has strong mechanical performance and excellent biocompatibility. A good experimental result is achieved by using the chitosan-calcium carbonate fibrous network-like structure as a cytoskeleton material. The preparation method is simple in process, low in cost and environmentally-friendly; and the three-dimensional network-like chitosan-calcium carbonate nano composite material is in accordance with the standard of a biomaterial of a cell culture medium in tissue engineering, and can be applied to bone repair.

The invention relates highly effective fireproof dust suppression material and method. The material comprises 60% calcium chloride dehydrate, 20% magnesium chloride hexahydrate, 20% water and surface active agent. The surface active agent comprises wetting agent, dispersing agent and inhibitor. The calcium chloride-dehydrate and magnesium chloride hexahydrate have hydroscopicity and fire-retardancy, and the surface active agent has the advantages of reducing surface tension, humectation and thickening action. The invention has the advantage of reducing corrosion. It can be used in anti-dust, fireproof fields.

The invention relates to the technical field of steel pickling waste liquid, and especially relates to a treatment method of hydrochloric acid waste liquid from steel pickling. The iron grade in the treated waste residue reaches 44-50% and can meet the requirements of steel mills on the iron grade quality, and a calcium chloride solution can meet the requirements of other enterprises. Zero pollution emission after hydrochloric acid waste liquid treatment is achieved, and resources are recycled. An oxidation neutralization method is improved and upgraded to enable liquid calcium, calcium chloride dihydrate, anhydrous calcium chloride and sludge produced after the treatment to meet the standard requirements and the industrial demands, so as to recycle the resources. The project investment is little, the treated products can be used in industrial production to both achieve zero emission of treated pollution wastes and recycle the resources, and moreover the operation cost is low, so that the treatment method is suitable for the development demands of small and medium-sized enterprises.

The invention relates to a pharmaceutical-grade calcium chloride production process, which comprises 1) soaking light calcium carbonate in pure water, dewatering by a sedimentation centrifuge and collecting the precipitate; 2) adding the washed light calcium carbonate into a reactor, neutralizing by hydrochloric acid to obtain subacidity, preparing 40% calcium chloride solution, boiling, precipitating while keeping at a given temperature for a few hours, filtering, adjusting pH to 9-11 by lime water, precipitating for a few hours, filtering, adjusting pH to 3-5 by hydrochloric acid and precisely filtering; 3) evaporating the solution until a thin film appears at the surface of the solution, cooling for a while and stirring for crystallizing; and 4) breaking the crystal, putting into a vacuum oven, and heating for drying to obtain calcium chloride dihydrate with uniform particle size.

The invention discloses a human in-vitro seminal liquid. The human in-vitro seminal liquid comprises 90-113 mM / L of inorganic salt of sodium chloride, 4.20-5.18 mM / L of potassium chloride, 1.80-2.28 mM / L of calcium chloride dihydrate, 0.26-0.48 mM / L of monopotassium phosphate, 0.18-0.87 mM / L of magnesium sulfate heptahydrate, 20-30 mM / L of pH buffering agent sodium bicarbonate, 0.01-0.05 g / L of bacteriostat component gentamicin sulphate, 0.21-0.45 mM / L of energy substance sodium pyruvate, 18.50-24.3mM / L of L-sodium lactate, 2.56-3.00 mM / L of glucose, 0.45-1.05%(v / v) of other components of non-essential amino acid, 0-1.0 mM / L of glutamine dipeptide, 0-0.01 mM / L of ethylene diamine tetraacetic acid, 0.05-0.10 mM / L of taurine, 5-10 g / L of human serum protein and 42-58 IU / L of human recombinant insulin.

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 an electric heating membrane comprising the following components in percent by weight: 20-40 percent of stannic chloride, 25-35 percent of titanium tetrachloride, 0.2-0.3 percent of calcium chloride dihydrate, 0.1-0.3 percent of bismuth trichloride, 20-40 percent of alcohol and 5-7 percent of water. The invention has the advantages of high heat efficiency, stronger physical and chemical properties, suitability for various environments, no oxidation or ageing phenomena after being heated, convenience for production, high yield, capability of being made into various forms according to the requirement of carrier shapes and convenience for application.

The invention discloses a method for preparing a monocrystalline CaTiO3 dendrite by using a hydrothermal method. The method comprises the following steps: firstly dissolving a titanium compound in an ethanol solvent to obtain an A solution; then mixing calcium chloride dihydrate, distilled water and an ethanol solvent to obtain a B solution; and slowly and dropwisely adding the A solution into the B solution, adjusting the pH value to 10-11, stirring and mixing, placing the mixture in a hydrothermal kettle, and keeping the temperature at 180-260 DEG C for 1-36 hours to obtain the CaTiO3 dendrite. Through the method, the pure CaTiO3 dendrite is prepared by a one-step hydrothermal method by using inexpensive butyl titanate and calcium chloride dihydrate as the raw materials and water-ethanol as the solvent under low-temperature non-equilibrium conditions, the process route is simple, and the morphology of the CaTiO3 dendrite can be conveniently controlled by adjusting the process parameters.

The invention provides sheep embryonic cell culture fluid. The sheep embryonic cell culture fluid comprises the following components: calcium chloride dehydrate, anhydrous magnesium sulfate, potassium chloride, monopotassium phosphate, sodium bicarbonate, sodium chloride, bovine serum albumin, glucose, sodium pyruvate, sodium lactate and phenol red sodium salt. Embryonic fluid at a volume by concentration of 10% is also added to the culture fluid so that the culture fluid has a great cell culture effect. According to the culture fluid, the components collaborate with each other, so that the irritation to an early embryo is reduced, and the embryo can grow well; and in addition, 10% of uterine embryonic fluid of a ewe is added to the culture fluid, so that the fusion rate of a reconstructed embryo can be remarkably increased. Compared with the culture fluid without the embryonic fluid, the culture with the embryonic fluid has the capability of obviously increasing the survival rate and blastocyst rate of in-vitro cultured embryos; and the culture fluid provided by the invention also can improve uterine receptivity, therefore, the lambing percentage is increased obviously.

The invention relates to plant propagation, and in particular relates to a year-round strawberry hybridizing and breeding method which comprises the following step of: taking fragaria orientalis and rupee strawberry test tube seedlings as test materials. A regulating and controlling method for male sterile line of the rupee strawberry is as follows: selecting a plurality of runner tips of the rupee strawberry test tube seedling, controlling the temperature at 10-13 DEG C, controlling illuminating hour as 4-5h.d<-1>, and processing for 16-25 days, to promote the rupee strawberry to generate the male sterile line; and a method for preparing fragaria orientalis pollen mother liquid comprises the following steps of: setting volume of distilled water mixing liquid of 5.2g of fragaria orientalis pollen and boric acid, 150g of sucrose, 12.5mg of calcium chloride dihydrate and 36g of polyethylene glycol 4000 to 1L, and using the distilled water mixing liquid as mother liquid for further, wherein the pollen accounts for 8-12g; diluting mother liquid by distilled water; and keeping for 6 hours at 18-22 DEG C, uniformly shaking, spraying on the rupee strawberry male sterile line, and collecting seeds and planting after the rupee strawberry fruits are mature.

The invention discloses a method for comprehensive reclaiming elements by treating laterite-nickel ore by combination of chemical waste sulfuric acid and waste hydrochloric acid. The method comprises the following steps: stirring and extracting the prepared laterite-nickel ore with granularity of less than 0.15mm in a solid-liquid ratio that waste hydrochloric acid to minerals is (3-5):1; neutralizing extract with calcium carbonate or lime to remove iron, and precipitating nickel with lime; precipitating magnesium by adding lime after nickel is precipitated to obtain magnesium hydroxide, evaporating and crystallizing the liquid after magnesium is precipitated to produce calcium chloride dehydrate; soaking the prepared laterite-nickel ore of 2-10mm in a liquid-solid ratio of 0.5:1 for multiple times in a countercurrent manner, and neutralizing the extract with magnesium hydroxide to remove iron, and precipitating magnesium with sodium hydroxide; evaporating and crystallizing the solution after nickel is precipitated to produce magnesium sulfate heptahydrate. The process is adjustable in production scale, wide in resource utilization, simple in process flow, small in investment and low in energy consumption, can be used for comprehensively reclaiming elements, does not pollute the environment, has the advantages of high nickel reclaiming rate, simple operation and low production cost, and provides an extremely effective and economical way to effective utilization of waste sulfuric acid and waste hydrochloric acid and comprehensive reclaiming of laterite-nickel ore.

The invention relates to a drying agent for a vehicle lamp. The drying agent comprises components in parts by mass as follows: 15-18 parts of calcium chloride dehydrate, 28-40 parts of limestone, 25-36 parts of polyacrylamide, 20-24 parts of carbon powder, 10-18 parts of anhydrous cupric sulfate, 8-14 parts of activated carbon and 40-45 parts of water. The drying agent can control the humidity environment in the vehicle lamp, the phenomenon that condensation fog appears in an inner lampshade of the vehicle lamp due to change of the environment temperature when the vehicle lamp is turned on is eliminated, and the probability that steam enters the vehicle lamp is greatly reduced. The inside temperature of the vehicle lamp rises when the lamp is turned on at ordinary times, by means of the characteristic, the drying agent of a breather valve can be activated, and the purpose of prolonging the service life is achieved.

The invention discloses a shell-based air purifying material and a preparation method thereof. Raw materials include 100 parts of shell powder, 60-80 parts of calcium chloride dihydrate, 30-40 parts of ammonia water with the concentration of 20%, 180-250 parts of hydrogen peroxide with the concentration of 30%, 20-80 parts of gypsum-based gelatinization powder and 50-180 parts of water. The preparation method comprises the following steps: carrying out pretreatment, in-situ reaction and combination to obtain a powdery material with an air purifying function; adding 0.1-3.5 parts of a reinforcing filler and 0.1-73 parts of a hydration liquid-phase medium into the powdery material, then moulding, drying, maintaining, and then carrying out finishing treatment, so that powdered granulated, shaped granular or plate-shaped shell-based air purifying material is obtained. The preparation method disclosed by the invention has the advantages that the in-situ reaction is carried out on the shell powder, so that micro-scale calcium peroxide is produced in porous channels of the shell powder, the shell powder has the capability of directly oxidizing and decomposing harmful gases such as formaldehyde, the problems that an existing air purifying material is low in purification rate and poor in purification persistence are solved, and functionality and decorativeness such as self humidity control, antibacterial and mouldproof properties, fire resistance, noninflammability, sound absorption and noise reduction can be achieved.