168results about How to "Improve safety and environmental protection" patented technology

Apparatus and method for fail-safe high-speed-pneumatic valve is disclosed. Fail-safe dependability is provided by a spring-loaded normally-closed pneumatic actuator. When the spring-loaded actuator is pressurized, the normally closed mechanism is actuated to the valve active position. Concurrently, the pressure is directly applied to deflect a diaphragm or a bellow-assembly back to sealing position. Ultra high purity embodiments with standard dome shaped diaphragms are disclosed. Additional high conductance diaphragms and bellows embodiments are employed for higher conductance valves. Novel flow path layouts are disclosed. The valves are applicable for fast gas and fluid switching and are particularly suitable for high productivity Atomic Layer Deposition (ALD) applications. Additional embodiments cover improved diaphragm and seal reliability, externally adjustable valve conductance, improved valve safety and high temperature valve seals.

The invention discloses a mechanical equipment cleaning liquid, which consists of monohydric alcohol, glycol, complexing agent, anionic surfactant, nonionic surfactant, compound corrosion inhibitor, coloring agent and water. The mechanical equipment cleaning liquid is prepared by using environmental-friendly substances, is a universal cleaning fluid for mechanical equipment maintenance and repair, does not have inflammables and explosive characteristics during use, does not cause higher adverse influences on a working environment, does not contain environmentally hazardous substances such as nitrite, phenol and formaldehyde, is nonflammable, is nontoxic to operators and has a better effect of cleaning inorganic fouling such as asphalt, better safety and environmental friendliness are realized, the processing environment and sanitary conditions can be improved, the working efficiency can be improved and the cost can be reduced.

The invention discloses a water-based organosilicon coating. The water-based organosilicon coating comprises the following components in percentage by weight: 2.00-40.00 percent of an organosilicon emulsion, 12.00-40.00 percent of nano-silicon sol, 0.50-5.00 percent of a dispersant, 0.10-1.50 percent of a wetting agent, 1.00-45.00 percent of a packing, 10.00-25.00 percent of a pigment, 0.30-5.00 percent of a thickening agent, 0.00-1.50 percent of a flatting agent, 0.30-3.00 percent of a coalescing agent, 0.08-0.20 percent of a disinfectant, 0.00-0.50 percent of a foam killer and the balance of deionized water, wherein the solid content of the organosilicon emulsion is 50% and the nano-silicon sol is epoxy silane modified silica sol. The invention also discloses a preparation method of the water-based organosilicon coating. The water-based organosilicon coating is low in cost and excellent in environment-friendly performance, and a paint film with the water-based organosilicon coating is favorable in adhesion and strength and extremely good in heat resistance of up to 750 DEG C.

Apparatus and method for fail-safe high-speed-pneumatic valve is disclosed. Fail-safe dependability is provided by a spring-loaded normally-closed pneumatic actuator. When the spring-loaded actuator is pressurized, the normally closed mechanism is actuated to the valve active position. Concurrently, the pressure is directly applied to deflect a diaphragm or a bellow-assembly back to sealing position. Ultra high purity embodiments with standard dome shaped diaphragms are disclosed. Additional high conductance diaphragms and bellows embodiments are employed for higher conductance valves. Novel flow path layouts are disclosed. The valves are applicable for fast gas and fluid switching and are particularly suitable for high productivity Atomic Layer Deposition (ALD) applications. Additional embodiments cover improved diaphragm and seal reliability, externally adjustable valve conductance, improved valve safety and high temperature valve seals.

The invention relates to a water-borne cable anti-icing paint containing water-borne perfluoroalkyl fluorocarbon emulsion, which comprises the following raw materials in percentage by weight: 58 to 62 percent of aqueous perfluoroalkyl fluorocarbon emulsion, 1.5 to 2.5 percent of water-borne polytetrafluoroethylene emulsifying wax, 15 to 20 percent of water-borne color paste, 0.1 to 0.5 percent of pH regulator, 1 to 2 percent of amino resin cross-linking agent or water-borne polyurethane cross-linking agent, 0.1 to 0.2 percent of antiseptic preservative, 1 to 1.2 percent of cellulose and the balance of deionized water, wherein the water-borne color paste is the mixture of the water-borne color paste with one color or the water-borne color paste with more than two colors. The water-borne cable anti-icing paint of the invention is big in water repellent angle, low in surface energy, excellent in water repellent and oil repellent properties, safe and environment-friendly, can firmly adhere to the surface of a cable in a low temperature and cold environment and is obvious in anti-icing function.

The invention relates to the technical field of chemical products, in particular to ultrasonic water-based cleaning fluid for hardware products. The ultrasonic water-based cleaning fluid for hardware products comprises, by weight, 1-5 parts of dimeric surfactant, 10-20 parts of nonionic surfactant, 1-10 parts of alcohol ether compound, 1-5 parts of alkylol amine compound, 1-5 parts of a builder, 0.1-5 parts of auxiliaries and 60-80 parts of water. The water-based cleaning fluid is low in manufacturing cost, safe, environmentally friendly, efficient, convenient, fast, low in toxicity, and easy to biodegrade and wash away, the residual quantity of the fluid on the surface of metal is extremely low after the fluid is washed away, the metal cannot be corroded, the metal can keep good colour and luster, and the quality of metal products is improved.

The invention belongs to the technical field of cat litter, and provides deodorant plant cat litter and a preparing method thereof. The deodorant plant cat litter is prepared from, by weight, 60-70 parts of soybean fibers, 25-35 parts of corn starch, 10-20 parts of sodium bicarbonate, 5-10 parts of zeolite, 4-6 parts of citric acid, 1-3 parts of sodium phenylpropionic acid, 3-7 parts of active carbon, 2-5 parts of ammonium persulfate, 2-4 parts of guar gum, 1-5 parts of a garlic extract, 1-3 parts of tea residues and 0.5-1 part of polyethyleneimine. By means of the deodorant plant cat litter and the preparing method thereof, the technical problem that cat litter in the prior art is poor in antibacterial deodorant effect is solved.

The invention provides a combined solvent and application thereof. The combined solvent comprises the following components in percentage by weight: 1 to 99 percent of terpenoid and 1 to 99 percent of isoparaffin. The combined solvent has good compatibility with pesticides, good safety and environmental performance, high biodegradability, low freezing point and high flash point, is eco-friendly and is safe and reliable for production, storage, transport and use, and can be applied to pesticide preparations.

The invention relates to a waterproof and oilproof agent as well as a preparation method and application thereof. The waterproof and oilproof agent is prepared from the following components in percentage by weight: 30%-50% of styrene acrylic polymer, 5%-10% of beeswax emulsion, 2.5%-4.5% of polyvinyl alcohol, 2%-5.5% of modified starch, 0.5%-2% of plasticizer and 28%-60% of deionized water. The waterproof and oilproof agent is good in film-forming property; beeswax emulsion in a formed coating and the styrene-acrylic acid polymer are combined to form a hydrophobic and oleophobic surface layer;meanwhile, the hydrophobic and oleophobic surface layer is compounded with the modified starch, so that the waterproof and oilproof effects of the waterproof and oilproof coating on food-grade raw paper are obviously improved; the waterproof and oilproof properties of the waterproof and oilproof agent are extremely good; the waterproof and oilproof agent can completely replace traditional waxing,silicon coating and laminating processes; and the paper can directly enter a papermaking pulping system to be recycled when being recycled, the pollution of the laminated paper to the environment isreduced; and therefore, the waterproof and oilproof agent is an environment-friendly material.

The invention provides a preparation method for waterborne polyurethane. The preparation method comprises the following steps: (A) isophorone diisocyanate and polyester dihydric alcohol are reacted to obtain prepolymers; (B) the prepolymers, alcohol chain extenders and hydrophilic chain extenders are mixed and subjected to chain extension; (C) the compounds obtained from the step (B), salt forming agents and water are mixed and reacted to obtain waterborne polyurethane. The waterborne polyurethane is prepared through an internal emulsification method and has good hydrophilicity because the waterborne polyurethane contains hydrophilic groups. The invention also provides a waterborne transfer painting. The waterborne transfer painting comprises waterborne polyurethane, deionized water, antifoaming agents, wetting dispersants, flatting agents and antiseptics. The waterborne transfer painting employs waterborne polyurethane as a waterborne transfer resin. Because hydrophilic groups are introduced into polyurethane macromolecule, The waterborne transfer painting is soluble in water. The waterborne transfer painting employs deionized water as a dispersion medium, so the waterborne transfer painting has high safety and environmental protection.

The invention discloses a simulation test system for the temperature resistance and the pressure resistance of a packer rubber sleeve. The simulation test system comprises a sleeve induction heating device, a middle-frequency power supply and control system, a pressurizing device and a computer monitoring system. The sleeve induction heating device comprises a surface sleeve, a heating sleeve arranged in the surface sleeve and an induction heating mechanism arranged on the surface of the heating sleeve, wherein heating sleeve is connected with the pressurizing device, and the induction heating mechanism is connected with a middle frequency power supply and control system. The middle frequency power supply and control system and the pressurizing device are both connected with the computer monitoring system. A pressurizing and heating experiment for an underground tool to be tested is finished in the heating sleeve. The simulation test system uses a middle frequency induction heating method, an induction heating coil is wound on the heating sleeve, the heating speed is quick, and accordingly the testing efficiency is improved. The simulation test system is simple in equipment structure, small in disposable equipment investment, low in operation management cost and good in safety and environmental friendliness.

The invention relates to a solvent-free epoxy coating for the inner wall of a petroleum storage tank and a preparation method. Solution A comprises E-51 epoxy resin, butyl glycidyl ether, KH-560 silane coupling agent, ALCOPHOR827 anti-corrosion auxiliary agent, BYK-085 flatting agent, Efka-722 defoamer, 400 mesh rutile type titanium white, 325 mesh baryte powder, 400 mesh talcum powder, carbon black and 881-B organic bentonite. Solution B comprises polyamide EU8235 epoxy hardener, dimethylbenzene and normal butanol. The weight percent of the solution A is 80% to 90%. The solvent-free epoxy coating is safe and environment friendly, the coating volume shrinkage is 1.15% to 1.5%, the pull-off adhesion is 16.5MPa to 20.0MPa, a chemical media resistance 90d paint film is in good condition, anda salt spray resistance 3000h paint film is in good condition. With the adoption of the solvent-free epoxy coating, corrosion of the storage tank can be greatly reduced, and the service life of the storage tank can be greatly prolonged.

The invention provides hard-water-resisting semi-synthetic metal processing fluid and a preparation method thereof. The hard-water-resisting semi-synthetic metal processing fluid is prepared from thefollowing components in parts by weight: 25 to 60 parts of basic oil, 3 to 20 parts of emulsifier, 3 to 20 parts of antirust agent, 2 to 6 parts of corrosion inhibitor, 5 to 30 parts of alkali value storage agent and 8 to 40 parts of water. The hard-water-resisting semi-synthetic metal processing fluid provided by the invention has the advantages of good hard water stability and excellent antirustperformance, safe and odorless working environment and no irritation on human body skin and respiratory tracts.

The invention belongs to the technical field of coatings, and relates to a waterborne high temperature resistant paint and a preparation method thereof. The waterborne high temperature resistant paintcomprises the following components in parts by mass: 55-65 parts of waterborne modified silicone resin, 15-30 parts of waterborne aluminium silver paste, 1-8 parts of a drier, 2-7 parts of a levelingagent, 2-7 parts of a dispersant and 8-15 parts of water. The waterborne high temperature resistant paint has excellent high temperature resistance and excellent corrosion resistance, adhesive forceand impact-resistant strength.

The invention provides ternary peroxide fluororubber and a preparation method thereof, and an intelligent wearable material and a preparation method thereof. The invention aims to solve the technicalproblem that wrist strap and watchband materials in the prior art cannot well meet requirements for swimming pool water resistance, sweat resistance, artificial sebum resistance, oleic acid resistanceand dirt resistance required by intelligent wearable wrist straps and watchbands at the same time. According to the preparation of fluororubber in the invention, iodine is used as a crosslinking active point, iodine used as the crosslinking active point is bonded to the tail end of a fluororubber polymer molecular chain or the tail end of a side chain of a vulcanization point monomer, and vulcanization crosslinking can be easily carried out with peroxide. A polymer prepared in the invention is used for preparing the intelligent wearable material. The prepared intelligent wearable wrist strapmaterial or watchband material can meet the requirements for swimming pool water resistance, sweat resistance, artificial sebum resistance, oleic acid resistance and dirt resistance, and a intelligentwearable wrist strap or watchband prepared from the material is safe, environmentally-friendly and durable to use, soft in hand feeling, good in texture and comfortable in somatosensory feeling and can better meet the high technical requirement for continuous changing of the material for the intelligent wearable wrist strap or watchband.

The invention discloses a multi-energy complementary heat pump drying device suitable for a low-temperature working condition. The device comprises a refrigerant loop, a water loop and an air loop. When the device operates, especially under the low-temperature working condition in winter, hot water prepared by solar energy is sent to a second evaporator to heat a refrigerant to provide an auxiliary heat source for a heat pump, the total heat production amount of the heat pump is increased, and the technical problem that the heat pump is low in efficiency under the low-temperature working condition is solved; and in addition, solar energy is provided for independent heat supply, a heat pump condenser and a gas-water heat exchanger are simultaneously or independently put into operation to heat and dry air, and the purpose of drying in multiple modes and multiple energy sources is achieved. The invention provides a novel multi-energy complementary drying system suitable for the low-temperature working condition based on solar energy and the heat pump, through combined utilization of the heat pump and the solar energy, the operation efficiency of heat pump drying is further improved, electric energy consumption is reduced, and pollutant emission is reduced.

The invention discloses a latex pillow with a plastic shape and a preparation method thereof. The latex pillow comprises a latex pillow inner made from natural latex through foaming and a stainless steel wire mesh arranged in the latex pillow inner, the shape of the stainless steel wire mesh is matched with that of the latex pillow inner, when the stainless steel wire mesh is bent or curled into a special shape, the special shape can be kept, and therefore the latex pillow inner is located at different use states. The latex pillow with the plastic shape is simple in structure, convenient to operate, safe, environmentally friendly, convenient to wash and plastic in shape. The preparation method of the latex pillow comprises the steps of prepared material mixing, bubbling and mold filling, heat curing, cleaning and drying and the like; during bubbling and mold filling, foam is guided into an inner cavity of a pillow mold containing the stainless steel wire mesh, therefore, the stainless steel wire mesh is directly embedded into the latex pillow inner, and processing is easy and convenient.

The invention relates to the field of synthetic leathers, and concretely relates to a silicone rubber synthetic leather and a production technology thereof. The silicone rubber synthetic leather comprises a surface rubber layer, a bottom surface layer and a substrate from top to bottom; the surface rubber layer comprises, by mass, 0.1-60% of poly(methylhydrogensiloxane), 1-20% of polyvinylsiloxane, 0.1-20% of silica, 0.1-10% of vinyl silicone resin, 0.01-1% of a platinum catalyst, 0.001-0.1% of an inhibitor and 0-0.1% of a color paste; and the bottom rubber layer includes, by mass, 0.1-80% ofpoly(methylhydrogensiloxane), 0.01-1% of polymethylsilsesquioxane, 1-20% of polyvinylsiloxane, 2-8% of trimethylchlorosilane, 0.01-1% of the platinum catalyst, 0.001-0.1% of the inhibitor and 0-0.1% of the color paste. The silicone rubber synthetic leather has the advantage of good wear resistance, good flame retardation property, good antifouling property, good hydrolysis resistance, high stability, high safety, small environmental pollution and beautiful appearance.

The invention discloses a paving method of a durable tunnel pavement. The paving method comprises the following steps: (1) carrying out sand blasting treatment on a cement concrete plate, spreading rubber asphalt and gravel on the surface of the cement concrete plate, and grinding to form a rubber asphalt and gravel seal coating; (2) grinding to form an asphalt mixture substrate on the rubber asphalt and gravel seal coating, pouring cement-based mortar, and naturally curing to form a poured semi-flexible paving lower layer; (3) spreading modified emulsified asphalt so as to form a modified emulsified asphalt layer; and (4) paving a fine-grain type asphalt mixture or a medium-grain type asphalt mixture to form a high-modulus warm mixing inflaming-retarding asphalt mixture paving upper layer. According to the invention, the paving method is strong in universality and simple in construction process, adopts a relatively conventional material, is strong in operability, and has good construction peaceability; with the whole paving structure, design service life can be obviously prolonged and can achieve 20-30 years, and good fireproofing, skid resistance, safety, as well as energy conservation and environment protection effects are achieved.

The invention discloses an environment-friendly polyolefin hot melt adhesive for cigarettes and a preparation method thereof, and belongs to the technical field of high polymer material synthesis. The adhesive is mainly prepared from the following raw materials in percentage by weight: 20-40% of POP resin, 5-20% of modified resin, 5-15% of a modifier, 20-50% of tackifying resin and 0.1-1% of an antioxidant. The invention also provides a preparation method. The prepared hot melt adhesive has the advantages of high safety, environmental protection, high aging resistance, high lasting adhesion, low density, low softening point, low viscosity and good sealing performance, can be used in the high-speed sealing packaging fields of cigarette industry, food industry and the like, is especially suitable for the fields of novel tobacco, food industry sealing packaging and the like, and is suitable for popularization and application.

The invention provides a phosphorus-free composite corrosion and scale inhibitor, which comprises active components, auxiliary agents and water. The active components include polyacrylic acid, polyepoxysuccinic acid, maleic acid-acrylic copolymer, polyaspartic acid, benzotriazole and inorganic sodium salt. The auxiliary agents include alkanolamide, long-chain fatty amine and micromolecular alcohols. The phosphorus-free composite corrosion and scale inhibitor is excellent in corrosion and scale inhibition effect and high in market competitiveness; by adding of alkanolamide and long-chain fattyamine, dirt particle dispersion performance can be improved, and corrosion and scale inhibition and rust prevention performances can be improved; by adding of the micromolecular alcohols, dissolvability of alkanolamide and long-chain fatty amine can be effectively improved, long-term stable storage is promoted, synergistic effects of components can be promoted, and the corrosion and scale inhibition performances are further improved; due to freeness of any inorganic phosphorus and organic phosphorus compounds, excellent safety and environmental friendliness and a promising practical application prospect are realized.

The invention provides a vacuum microwave drying recycling treater of a high temperature-resistant communication cable insulation process. The vacuum microwave drying recycling treater is characterized by comprising a microwave dryer (1), a coil heat exchanger (2), a vacuum pump (5), an auxiliary recovery storage tank (3), an infrared temperature detector (22) and a feedback and control system (23), wherein the microwave dryer (1) comprises a microwave emission device (6), and a cable transmitting and microwave heating cavity; the coil heat exchanger (2) is connected with the vacuum pump (5) by use of a vacuum pipe (19); the microwave emission device (6) is composed of a microwave emitter (7), a waveguide tube (8) and a resonant cavity (9). The vacuum microwave drying recycling treater has the advantages of high drying efficiency, and evener and more thorough volatilization of auxiliaries, and more dispersive and evener pores formed in an insulating layer, and therefore, the low dielectric constant and the good quality of the insulating layer are guaranteed; in addition, the auxiliaries can be recycled after vacuum condensation and reflux, and therefore, the production cost can be reduced and the economic benefit can be improved.

The invention discloses a magnesite concrete which is prepared from the following raw materials in parts by weight: 50-60 parts of magnesite, 320-400 parts of ordinary Portland cement, 6-10 parts of bentonite, 10-20 parts of coal gangue, 5-8 parts of novel water reducing agent, 3-5 parts of rosin, 500-600 parts of river sand, 3-4 parts of magnesium chloride, 30-50 parts of blast-furnace cinder, 5-10 parts of dry carbide slag, 1-2 parts of sodium lauroyl sarcosine, 3-5 parts of bone coal, 170-200 parts of water, 3-5 parts of glass powder, 1-2 parts of ferrous sulfate, 4-6 parts of calcium phosphate, 1000-1100 parts of limestone rubble, 1-1.6 parts of air entraining agent and 1-2 parts of ethylenediamine tetraacetic acid. After the magnesite is mixed in the magnesium chloride solution and mixed with the solution a, the hardness and surface water resistance are effectively enhanced. The concrete has the advantages of high overall quality, high wear resistance, high impact resistance, high hardness, favorable crack resistance, long service life, high safety and environment friendliness.

The invention discloses a method for preparing a modified polyacrylamide water treatment material. Stearic acid and triethanolamine are subjected to blending reaction, obtained ester amine is mixed with a dimethyl carbonate solution of hydroxypropyl methylcellulose to perform quaternarization, obtained quaternary ammonium salt is used to treat acrylamide monomer, and polymerization is performed under the action of an initiator, so that quaternary ammonium salt grafted polyacrylamide is obtained. The method is high in finished product stability, good in water treatment effect, safety and environmental friendliness, and excellent in overall performance.

The invention discloses a water-based rubber treating agent. The water-based rubber treating agent is prepared from raw materials in parts by weight as follows: 3-5 parts of nano-silica, 80-100 partsof methyl methacrylate, 10-15 parts of rosin, 3-5 parts of polyethylenimine, 4-7 parts of oleic acid, 0.3-1 part of 2-mercapto-benzimidazole, 20-30 parts of a rubber matrix, 2-4 parts of ammonium persulfate and 0.7-1 part of a dispersant. The treating agent improves a traditional organic solvent treatment method and is high in safety and environmental protection property and good in effect.

The invention discloses a neutral environment-friendly putty powder which has the air purification property and is free of coating brushing and smooth in appearance. The putty powder is prepared from,by weight, 7-23 parts of ultra-high-strength gypsum, 16-40 parts of calcium carbonate powder, 15-35 parts of calcium carbonate, 6-19 parts of non-calcined kieselguhr, 0.2-1 part of hydroxypropyl methyl cellulose, 2-8 parts of redispersible latex powder, 0.1-0.5 part of starch ether, 1-6 parts of sodium bentonite, 5-15 parts of sepiolite, 2-8 parts of attapulgite and 0.1-1 part of mixed crystal titanium dioxide. Accordingly, the putty powder has the properties of good safety, environmental protection, water resistance, respiratory hygroscopicity, formaldehyde and harmful gas elimination and the like, and has good capacity of improving the quality of the living environment; meanwhile, the surface of the putty powder is smooth, firm and white, other coating or wallpaper can be omitted, and the effects of protecting the environment and reducing the cost can be achieved.

The invention discloses continuous chloride production device for continuous production of chlorinated paraffin, chloroacetic acid, methyl chloride and the like. The device comprises all or several ofan absorption tower, a reaction kettle, a refining kettle, an absorption tank, a heat exchanger and an exhaust gas treatment device, wherein the absorption tower is connected with the reaction kettleand the heat exchanger is arranged therebetween; and the reaction kettle is connected the refining kettle and the absorption tank in sequence. Under a stable production state, a gas phase continuously enters the absorption tower and the refining kettle, respectively; a liquid phase is continuously added through the absorption kettle, pre-reacted with the unreacted gas phase, introduced into the reaction kettle, and sequentially introduced into the refining kettle after circularly absorbing the gas phase in the reaction kettle and the absorption tower, and the formed liquid crude product or deactivated catalyst is continuously discharged; the gas formed in the absorption tower sequentially collects the gas in the reaction kettle and the refining tank and then enters the absorption kettle,and after pre-reaction, exhaust gas is removed or collected by a gas product collection device. The device realizes the continuous production of chlorides, improves production efficiency and product yield, and enhances the control performance of reaction.

The invention provides binary peroxy fluororubber, a preparation method thereof, an intelligent wearable material and a preparation method thereof. Therefore, a technical problem that in the prior art, a wrist strap material and a watchband material cannot well meet the requirements for swimming pool water resistance, sweat resistance, artificial sebum resistance, oleic acid resistance and dirt resistance required by an intelligent wearable wrist strap and watchband at the same time is solved. According to the preparation of the fluororubber, iodine is used as a crosslinking active point; theiodine used as the crosslinking active point is bonded to the tail end of a fluororubber polymer molecular chain or the tail end of a side chain of a vulcanization point monomer, and vulcanization crosslinking can be easily carried out with peroxide. The polymer used by the invention is used for preparing intelligent wearable materials. The prepared intelligent wearable wrist strap material or watchband material can meet the requirements for swimming pool water resistance, sweat resistance, artificial sebum resistance, oleic acid resistance and dirt resistance, and the prepared intelligent wearable wrist strap or watchband is safe, environmentally friendly, durable, soft in hand feeling, good in texture and comfortable in somatosensory feeling and can better meet the high technical requirement for continuous change of the material of the intelligent wearable wrist strap or watchband.

The invention discloses a construction method for a tunnel crossing through a backfilling zone of super high-rise buildings. The construction method includes the following steps of conducting construction preparation; conducting advanced support on multi-layer self-advancing anchor bolts; conducting construction of sectional drift headings; and conducting construction of a similar cantilever reinforcing liner structure. By adopting advanced support of the multi-layer self-advancing anchor bolts, annular grouting reinforcement of small pipes and construction of the similar cantilever reinforcing liner structure, the problem that ground subsidence caused by backfill falling down in the tunnel construction process is effectively solved, safety risks are greatly reduced, constriction period cost is saved, and safety, environment protection, and economic benefits are improved dramatically.

The invention discloses a process for preparing a cement clinker additive from stainless steel pickling sludge, wherein the process comprises the following steps: S1, adding ferrous sulfate and liquidenvironment-friendly alkali into stainless steel pickling wastewater to obtain stainless steel pickling sludge; S2, adding fly ash into the stainless steel pickling sludge, uniformly mixing, and carrying out high-temperature dehydration treatment; S3, crushing and grinding the dewatered sludge into fine powder, adding 4%-6% of kaolin, uniformly mixing, and granulating; and S4, carrying out high-temperature calcination on the granulated material, and then crushing to obtain the clinker additive. According to the method, heavy metal ions in the pickling sludge generated in the stainless steel production process can be converted into harmless substances meeting the national environmental protection requirements; the content of metal Cr in the cement clinker obtained through the method is lower than 0.47%, the content of Ni in the cement clinker is lower than 0.06%, the quality of the cement clinker meets the index requirements of corresponding national product standards, reliability is high, and operation cost is low.