51 results about "Precipitated sulphur" patented technology

The invention relates to the technical field of friction materials, and particularly discloses an electromagnetic brake friction material prepared from granules and a preparation process of the electromagnetic brake friction material in order to solve the problem that an existing electromagnetic brake friction plate is difficult to prepare or insufficient in performance. The reinforcing material comprises plasma modified aramid pulp, coupling modified composite mineral fibers, SiO2 coated tetrapod-like zinc oxide whiskers and carbon fiber-aluminum silicon whiskers; the filler comprises modified needle-like wollastonite and organic modified precipitated barium sulfate; the adhesive comprises boron-silicon synergistic modified phenolic resin and modified carboxy nitrile rubber. The raw materials are improved, and granules are prepared by adopting a mixing and crushing process, so that the content of an adhesive can be greatly reduced, meanwhile, the die filling efficiency can be improved, the die thickness and the high-temperature heat fading of the friction material can be reduced, a cold press molding process can be omitted, and the qualification rate of finished friction materials can be improved.

The invention discloses a water-based single-component super-amphiphobic refrigeration coating, a coating and a preparation method of the coating, and relates to the technical field of coatings. 20-35 parts of a second filler; 5-10 parts of a third filler; 20-35 parts of a film-forming substance, 1-9 parts of an auxiliary agent and 3-50 parts of water; the first filler comprises fluorine-containing silane modified fumed silica; the second filler comprises at least one of long-chain silane modified precipitated barium sulfate, long-chain silane modified calcium carbonate and long-chain silane modified hollow glass beads; the third filler comprises an infrared emission filler treated by an organic silicon modifier. By modifying the filler, the purposes of stable dispersion and functional synergy of low-surface-energy substances and high-proportion inorganic nano filler in a water-based system are achieved.

The invention provides a method and system for recovering phosphate radicals, fluorine ions and sulfate radicals from phosphogypsum washing water step by step, and belongs to the technical field of industrial wastewater resourceful treatment. The method comprises the following steps: (1) adjusting the pH value of the wastewater to 3.0 + / -0.5, adding ferric sulfate according to the molar ratio of Fe to PO4 < 3-> of (1.0-1.5): 1, and selectively precipitating phosphate radicals to generate iron phosphate with the purity of more than or equal to 97%; (2) adjusting the pH value of the first filtrate to 4.7 + / -0.5, adding calcium fluoride seed crystals with the particle size of 50-200mm and CaCl2 (the molar ratio of Ca to F <-> is 0.5: 1-0.6: 1), and carrying out induced crystallization to recover calcium fluoride with the purity of more than or equal to 96%; and (3) adding Ca (OH) 2 (Ca: SO4 < 2-> molar ratio of 1.0: 1-1.2: 1) into the second filtrate, and directionally precipitating sulfate radicals to generate calcium sulfate dihydrate with the purity of more than or equal to 98%. According to the method, the pH and the precipitation sequence are controlled step by step, so that the problem of polyanion competition is solved, the recovery rates of phosphate radical, fluorine ion and sulfate radical respectively reach 98.8%, 96.3% and 97.5%, the content of PO4 < 3-> in purified water is less than or equal to 10 mg.L <-1 >, the content of F <-1 > is less than or equal to 5 mg.L <-1 >, and the content of SO4 < 2-> in purified water is less than or equal to 100 mg.L <-1 >, and the purified water can be directly recycled.

The invention discloses a self-crosslinking exterior wall coating containing reinforcing fibers and a preparation method thereof. The coating comprises the following components by mass: 10-20% water, 0.1-0.5% bentonite, 0.1-0.5% cellulose, 3-8% reinforcing fibers, 0.5-2% ethylene glycol, 0.5-1.5% dispersant, 0.1-0.5% wetting agent, 0.1-0.3% multifunctional additive, 15-25% titanium dioxide, 8-15% precipitated barium sulfate, 2-8% silane-modified nano-silica, 5-10% water-based polyurethane emulsion, 30-40% organosilicon-modified acrylic emulsion, 1-3% film-forming aid, 0.1-0.3% bactericide, 0.1-0.2% preservative, 0.5-1% mildew inhibitor, 0.3-1.1% defoaming agent, and 0.5-1.8% leveling agent. By compounding silicone-modified acrylic emulsion and water-based polyurethane emulsion, and adding silane-modified nano-silica and reinforcing fibers, the coating has excellent resistance to artificial weathering, wear resistance, impact resistance, corrosion resistance and high hardness.

The invention relates to an interferometric pigment comprising a layer of zinc sulfide-based material. The pigment advantageously comprises a low refractive index core and at least one high refractive index layer comprising zinc sulfide. The invention also proposes a method for synthesizing these pigments by non-homogeneously precipitating zinc sulfide on a powdered support, by adding a zinc salt solution to a reaction medium containing a dispersion of the powdered support, titrating a sodium sulfide solution having a fixed pH at a moderate temperature to obtain a precipitate. The invention also relates to cosmetic compositions comprising these interference pigments free of titanium dioxide, titanium dioxide being typically introduced as a filler or by providing a cosmetic ingredient containing titanium dioxide.

The invention discloses a production and preparation process of a heavy-duty water-based epoxy primer applicable to a high-salt and high-humidity environment, and relates to the technical field of production of water-based epoxy primers. Comprising the following raw materials in parts by mass: 30-50 parts of bisphenol A type water-borne epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum triphosphate, 10-15 parts of precipitated barium sulphate, 3-6 parts of silica powder, 0.8-1.2 parts of a sodium polyacrylate dispersing agent, 0.4-0.8 part of an organic silicon defoaming agent and 0.3-0.7 part of an acrylate flatting agent. And 0.6-1 part of a polyurethane thickening agent. The bentonite and the modified zirconium phosphate silicate powder in the reinforced anti-settling agent can improve the microstructure of the primer in a primer system, so that a coating is more compact and can be conveniently applied to a high-salt and high-humidity environment, and the salt spray resistance of the waterborne epoxy primer is enhanced.

To provide an aqueous ink composition capable of forming a coating film having excellent coating film properties such as substrate adhesion, abrasion resistance, wet abrasion resistance, heat resistance, and scratch resistance.SOLUTION: An aqueous ink composition comprises an acrylic emulsion resin (A) having an acid value of less than 40 mgKOH / g, an acrylic emulsion resin (B) having an acid value of 40 mgKOH / g or more and 250 mgKOH / g or less, and at least one of titanium oxide and precipitated barium sulfate.SELECTED DRAWING: None

This invention provides a method for the synergistic recovery of sulfuric acid and copper and zinc from waste acid from copper strip washing, comprising the following steps: S1, waste acid pretreatment; S2, novel bipolar membrane electrodialysis separation; S3, copper-targeted precipitation separation: adding a copper-targeted precipitant to the heavy metal concentrate to form a stable precipitate, followed by filtration and washing to obtain a copper-enriched precipitate; S4, zinc sulfate preparation: adjusting the pH of the filtrate after copper precipitation separation and removing reducing impurities, then evaporating and concentrating to a solution density of 1.4-1.5 g / cm³, cooling and crystallizing, and centrifuging to obtain zinc sulfate crystals, with the mother liquor returned to the evaporation and concentration unit for recycling. This method can achieve efficient recovery and recycling of sulfuric acid, while simultaneously achieving precise separation of copper and zinc ions and the preparation of high-value products, significantly improving the resource utilization efficiency of waste acid and reducing treatment costs.

The invention relates to an interferometric pigment comprising a layer of zinc sulfide material. The pigment advantageously comprises a low refractive index core and at least one high refractive index layer comprising zinc sulfide. The invention also proposes a method for synthesizing these pigments by heterogeneously precipitating zinc sulfide on a powdered support by adding a zinc salt solution to a reaction medium containing a dispersion of the powdered support and titrating a sodium sulfide solution having a fixed pH at a moderate temperature to obtain a precipitate. The invention also relates to cosmetic compositions comprising these interference pigments free of titanium dioxide, wherein titanium dioxide is typically introduced as a filler or by providing a cosmetic ingredient containing titanium dioxide.

The invention relates to a cathode plate protective coating for electrolytic zinc hydrometallurgy and a preparation method thereof. The invention relates to a cathode plate protective coating for electrolytic zinc hydrometallurgy. The cathode plate protective coating is formed by mixing a component A and a component B, the component A comprises self-made radix asparagi polyurea resin, GS-615 fumed silica, chromium oxide green, 2000-mesh mica powder, titanium dioxide, 500-mesh precipitated barium sulfate, KH792, BYK-306, BYK-163 and BYK-066N, and the raw materials are subjected to high-speed dispersion and ball milling to obtain a material system with high solid content and low viscosity (S = 97 + / -2%, and eta < 2000 mPa.s); and the component B is an N-3300 isocyanate curing agent with high solid content and low viscosity (S is 90 + / -2%, and eta is less than 1500mPa. S). By optimizing the formula design, the coating has high adhesive force, excellent permeability resistance, strong corrosion resistance and moderate flexibility, and can be brushed, sprayed or roller-coated on an easily-corroded area of a cathode plate, so that the service life is remarkably prolonged. The preparation and construction processes are simple and efficient, complex multi-layer coating or high-pollution solvents are not needed, the coating is suitable for industrial batch production, and the contradiction between the protection performance and the production cost in the traditional technology is effectively solved.

A method and system of providing seawater into a subterranean formation, including adding chloride salt having a metal cation to the seawater (having sulfate), precipitating sulfate salt (of the metal cation and sulfate), removing the sulfate salt as precipitated to give treated seawater having less sulfate than the seawater, and injecting the treated seawater into the subterranean formation.

The invention discloses a composition for a breathable waterproof coating, the coating and a preparation method of the coating, belongs to the technical field of building coatings, and aims to solve the problem that a coating is bubbled and stripped due to low water vapor permeability of an existing waterproof coating. The composition is prepared from the following raw materials in parts by weight: 35 to 45 parts of acrylic emulsion, 0.1 to 0.3 part of cross-linking agent, 5 to 10 parts of diatomite, 0.2 to 0.5 part of wetting agent and 0.1 to 0.3 part of carbon nano tube. The preparation method comprises the step of sequentially dispersing and mixing the acrylic emulsion, the defoaming agent, the cross-linking agent, the water, the preservative, the diatomite, the heavy calcium carbonate, the wetting agent, the carbon nano tube, the precipitated barium sulfate and other raw materials at a specific rotating speed. The coating keeps excellent waterproof performance, tensile strength and flexibility, meanwhile, the water vapor permeability is remarkably improved, and the coating has good constructability and durability and is suitable for building waterproof engineering with high requirements for air permeability.

The invention discloses a method for synergistically recovering valuable metals from copper-lead-zinc smelting slag through a wet process, which comprises the following steps: crushing smelting slag, scum and intermediate slag until the particle size is less than or equal to 0.15 mm, mixing according to a mass ratio of 3: 2: 1, adding 5-10% of sodium citrate, and ball-milling until the specific surface area is more than or equal to 500m / kg to break an inclusion; a graded leaching process is adopted, specifically, in the acidic stage, copper and zinc are synergistically leached through sulfuric acid with the concentration of 1.5-2.5 mol / L and hydrogen peroxide with the concentration of 0.1-0.3%, in the alkaline stage, lead and silver are leached through complexing of NaOH with the concentration of 2-4 mol / L and EDTA with the concentration of 0.05-0.1%, fractional precipitation is conducted through sodium sulfide, and in the thiosulfate stage, gold is catalytically leached through ammonium thiosulfate with the concentration of 0.5-1.0 mol / L and Cu < 2 + > with the concentration of 0.02- And finally, 5-8% of phosphate curing agent is added into tailings for stabilizing treatment. According to the method, the copper-zinc recovery rate is larger than or equal to 95%, the lead-silver recovery rate is larger than or equal to 90%, the gold recovery rate is larger than or equal to 85%, and the comprehensive The non-cyanide process is combined with closed circulation of wastewater, so that the heavy metal curing rate is more than or equal to 99%, the leaching toxicity reaches the GB5085.3-2007 standard, and the method is suitable for multi-metal cleaning recovery and resource utilization of smelting slag.

This invention discloses an anti-corrosion coating for plastic-coated composite steel pipes and its preparation method, relating to the field of coating preparation technology. The coating comprises the following raw materials in parts by weight: 48-52 parts of E-12 epoxy resin, 12-16 parts of E-20 epoxy resin, 15-17 parts of low-temperature curing agent, 0.6-1.0 parts of leveling agent, 0.2-0.4 parts of defoamer, 8-10 parts of precipitated barium sulfate, 2-4 parts of mica powder, and 0.2-0.4 parts of fumed silica. The low-temperature curing agent used in this invention is obtained by mixing aromatic amine compounds, fatty acid esters, and imidazole-containing compounds in a certain mass ratio. By combining the low-temperature curing agent with other raw materials, the roller coating temperature of the anti-corrosion coating on the inner wall of the plastic-coated composite steel pipe is reduced to 150-160℃, and curing can be completed quickly at 160-165℃, reducing the processing temperature. The coating exhibits high storage stability and good anti-corrosion performance.

According to one embodiment of the present invention, provided is a method for preparing a lithium compound, the method comprising: a step for adding sulfuric acid to a raw material containing lithium and magnesium to leach out lithium and thereby obtain a sulfuric acid leachate; and a step for heating the sulfuric acid leachate to precipitate magnesium sulfate and thereby remove magnesium.

The invention relates to the technical field of paint, in particular to a stain-resistant internal olefine acid finish paint coating material for a refrigerated container and a preparation method of the stain-resistant internal olefine acid finish paint coating material. Comprising the following preparation raw materials: deionized water, a pH regulator, a high-hydrophobic dispersant, a polyether siloxane defoaming agent containing hydrophobic particles, titanium dioxide, 3000-mesh precipitated barium sulfate, a hydrophobic modified acrylic emulsion, an environment-friendly coalescing agent, a bactericide, a mildew preventive, a high-efficiency emulsion defoaming agent with good compatibility of a polyether siloxane technology, and a non-silicon wetting agent. According to the environment-friendly water-based paint, through the synergistic effect of the super-hydrophobic dispersing agent, the hydrophobic emulsion and the optimized wetting system, the stain resistance close to that of a solvent-based paint is achieved while the water-based environment-friendly advantage is kept; the appearance problem of the refrigerated container is effectively solved.

The invention relates to the technical field of powder coatings, in particular to a preparation method and application of a coiled material powder coating for a soilless planting pool, and aims at solving the technical problems that an existing coating is poor in hydrolysis resistance, harmful substances are separated out and the like. The preparation method comprises the following steps: pre-mixing high-hydrolysis-resistance polyester resin, a curing agent, a hydrolysis-resistance stabilizer, a hydrolysis-resistance metal substrate adhesion promoter, a pigment, precipitated barium sulfate, active silica powder, a leveling agent, a degassing agent, a wetting dispersant and a wax aid in a high-speed mixer, feeding into a double-screw extruder, melting and mixing, and extruding, tabletting by a tabletting machine, cooling, crushing, and feeding into an ACM mill for fine crushing, so as to obtain a coiled material powder coating; the coiled material powder coating not only can meet the requirements of a metal coiled material pre-coating process, but also can tolerate long-term soaking of a hydroponic nutrient solution and an alkaline cleaning agent, and meanwhile, all components meet the hygienic standards of food contact materials and drinking water, so that the special powder coating is safe, environment-friendly and durable.

This application relates to the field of coating compositions, specifically disclosing an environmentally friendly epoxy coating that is phosphorus-free and resistant to salt spray for 1000 hours and its preparation method, comprising component A and component B, including the following raw materials in parts by weight: epoxy resin 35-40 parts, n-butanol 2-2.5 parts, xylene 5-5.5 parts, dispersant 0.1-0.5 parts, iron oxide red 10-12 parts, heavy calcium carbonate 4-6 parts, zinc oxide 2-4 parts, rust-inhibiting silica powder 4-6 parts, kaolin 4-6 parts, talc powder 3-4 parts, rust-inhibiting pigment 7-8 parts, precipitated barium sulfate 12-15 parts, petroleum resin 4-5 parts, leveling agent 0.02-0.06 parts; curing agent 12-15 parts, n-butanol 1-2 parts, xylene 1-1.5 parts, dispersant 1-3 parts, mica iron oxide 0.4-0.6 parts; talc powder including one or more of calcium ion exchange talc powder, cerium ion exchange talc powder, and lanthanum ion exchange talc powder. The coating in this application is environmentally friendly, phosphorus-free, and has good salt spray resistance.

The invention provides a dry powder thin coating type coating compatible with a dark pigment as well as a preparation method and preparation equipment of the dry powder thin coating type coating. The coating comprises the following components in parts by mass: 35-45 parts of modified latex powder, 10-20 parts of modified talcum powder, 20-30 parts of modified calcium powder, 5-10 parts of modified wollastonite, 5-15 parts of modified precipitated barium sulfate, 5-15 parts of modified titanium dioxide, 5-10 parts of modified quartz powder, 1-5 parts of nano magnesium oxide, 0.5-2 parts of nano zinc oxide, 0.5-1 part of a flatting agent, 1.5-2.5 parts of sodium dodecyl benzene sulfonate, 0.8-1.2 parts of sodium lignosulfonate, 0.8-1.6 parts of sodium chloride, 1-2 parts of cellulose and 0.3-0.5 part of a defoaming agent. The modified talcum powder, the modified calcium powder, the modified wollastonite, the modified precipitated barium sulfate, the modified titanium dioxide and the modified quartz powder are respectively obtained by modifying with a modifier. The coating can overcome the defects of traces and floating caused by mixing of an inorganic coating and a dark pigment.

The invention belongs to the technical field of ardealite resource utilization, and particularly relates to a pretreatment and resource recovery method of ardealite leacheate. The pretreatment method comprises the following steps: carrying out rough filtration and flocculating settling treatment on the ardealite leacheate, then adding an alkaline precipitant to adjust the pH value to 9.5-11.5, stirring to carry out precipitation reaction, then adding a reducing agent and / or a vulcanizing agent, stirring to carry out reduction and / or vulcanization reaction, and filtering to remove precipitated floc and colloid after the reaction is completed; and carrying out adsorption and fine removal on the obtained filtrate to remove residual dissolved heavy metals so as to obtain the pretreated phosphogypsum leacheate. According to the method, traditional precipitation, vulcanization, adsorption and other methods are organically integrated, various metal impurities and interference ions easy to co-precipitate in the ardealite leacheate are efficiently and selectively removed, and subsequent recycling (F / P recovery) coupling is facilitated.

The invention relates to the field of railway vehicle brake materials, in particular to a wheel shaping block for a locomotive and a preparation method of the wheel shaping block. The wheel shaping block for the locomotive comprises an upper-layer shaping part and a lower-layer supporting seat which are integrally connected, the shaping part comprises the following raw materials in parts by weight: 12-14 parts of phenolic resin, 2-4 parts of graphite, 10-12 parts of bauxite, 8-9 parts of silicon carbide, 5-8 parts of brass powder, 36-40 parts of iron powder, 10-16 parts of copper fibers, 5-7 parts of steel fibers, 2-3 parts of precipitated barium sulphate, 20-25 parts of nano SiO2 modified PEEK and 10-15 parts of graphene modified PPS; the supporting seat comprises the following raw materials in parts by weight: 80-85 parts of iron powder, 6-8 parts of copper powder, 2-3 parts of molybdenum powder, 4-6 parts of nickel powder and 1-2 parts of zinc stearate. The modification part in the modification block has a lower friction coefficient and higher impact strength and wear resistance, and is long in service life and high in safety.

The invention discloses a bio-based modified alkyd resin odorless coating and a preparation method thereof, and belongs to the technical field of coatings, and the bio-based modified alkyd resin odorless coating is characterized by being prepared from the following raw materials in parts by weight: 55-70 parts of bio-based modified alkyd resin, 10-20 parts of rutile titanium dioxide and 10-20 parts of precipitated barium sulphate. The coating is prepared from the following raw materials in parts by weight: 6-12 parts of an odor removing solvent, 0.2-0.5 part of fumed silica, 0.3-0.5 part of a wetting dispersant, 0.3-0.6 part of a high-efficiency composite drier and 0.25-0.45 part of an anti-skinning agent. The coating is lasting in odor removal effect and low in VOCs discharge amount, the obtained coating has good adhesive force and flexibility, high hardness, good acid resistance and excellent wear resistance, meanwhile, the coating has good weather resistance and construction performance, the development trend of environment-friendly coatings is met, the industry technology blank is effectively filled up, and the market requirement is met.

A method of producing hydrogen gas and separating sulfur from hydrogen sulfide including contacting the hydrogen sulfide with a catalyst in an aqueous solution to form a hydrogen gas and a reaction solution including sulfur; mixing the reaction solution and a sulfur solvent to form a sulfur solution; separating the sulfur solution into a first stream including the aqueous solution and a second stream including sulfur; and precipitating sulfur from the second stream.

The invention relates to the technical field of daily chemicals, in particular to a colloidal sulfur targeted oil control composition and application thereof. The colloidal sulfur is prepared from the following raw materials: an Arabic gum extract. According to the invention, a natural extract from Arabic gum is used as a stabilizer of colloidal sulfur, the extract is rich in natural polysaccharide and glycoprotein, has excellent surface activity and colloid protection capability, and replaces traditional petrochemical polymer stabilizers (such as PVA, polyvinyl alcohol and the like), so that the biosafety and environmental friendliness of the product are greatly improved; the method is suitable for development of green cosmetics or organic personal care products. The particle size of the prepared colloidal sulfur system can be controlled between 20 nm and 150 nm, after auxiliary adjustment of sodium citrate and ultrasonic homogenization treatment, the particle size distribution is concentrated, the Zeta potential is high, the system does not have obvious flocculation or sedimentation after standing for 90 days, and the colloidal sulfur system shows excellent storage stability and dispersing performance and is obviously superior to conventional precipitated sulfur or roughly separated sulfur dispersion liquid.

The invention relates to the technical field of chemical engineering, and discloses a method for efficiently preparing precipitated barium sulfate. The method comprises the following steps: by taking witherite raw ore as a raw material, crushing, performing targeted impurity removal, and calcining and activating to obtain witherite powder; then carrying out surface treatment by using a specific modifier to form an activation system; and carrying out a speed-controlled reaction with a sulfuric acid solution, and carrying out post-treatment to obtain precipitated barium sulfate. The modifier is prepared through a reaction of gamma-glycidyl ether oxypropyl trimethoxy silane, double-end amino polyethylene glycol and nicotinic acid, a siloxane group of the modifier can be anchored to the surface of powder, a long chain of polyethylene glycol provides steric hindrance, and a pyridine ring can reduce impurity adsorption. The precipitated barium sulfate prepared by the method is high in purity, low in impurity content, good in dispersion stability and low in process energy consumption, used equipment is conventional equipment in the field of chemical engineering, industrial production is easy to realize after operation adaptation of a solvent system and a purification unit, and application requirements in the high-end field can be met.

The invention provides a water-based acrylic coating with early water resistance as well as a preparation method and application thereof, and relates to the technical field of water-based coatings. The coating is prepared from the following raw materials in parts by mass: 50 to 60 parts of waterborne acrylic emulsion, 10 to 20 parts of deionized water, 8 to 12 parts of surface modified coarse-grained rutile titanium dioxide, 5 to 10 parts of surface modified fine-grained rutile titanium dioxide, 6 to 10 parts of precipitated barium sulfate, 0.2 to 0.5 part of dispersing agent, 0.3 to 0.5 part of defoaming agent and 1.5 to 2.5 parts of coalescing agent, 0.2 to 0.5 part by mass of a thickening agent, 0.2 to 0.5 part by mass of a leveling agent and 0.05 to 0.15 part by mass of ammonia water. KH-570 and A-151 are compounded with a silane coupling agent to perform synergistic surface modification on rutile titanium dioxide of different particle sizes, and a double-particle-size pigment step-by-step dispersion preparation process is combined, so that the synergistic improvement of the coating film density and the interface hydrophobicity is realized, the early water resistance of the water-based acrylic coating is remarkably improved, and the water-based acrylic coating has a wide application prospect.

The invention provides a dry powder thin coating type coating compatible with a light-color pigment and a preparation method of the dry powder thin coating type coating. The waterproof paint is prepared from 30-45 parts of modified latex powder, 8-20 parts of talcum powder, 18-30 parts of calcium powder, 4-15 parts of wollastonite, 5-15 parts of precipitated barium sulfate, 5-18 parts of titanium dioxide, 5-13 parts of quartz powder, 1-5 parts of nano magnesium oxide, 0.5-2 parts of zinc oxide, 1.5-2.5 parts of sodium dodecyl benzene sulfonate, 0.8-1.2 parts of sodium lignosulphonate, 0.8-1.6 parts of sodium chloride, 1-2 parts of cellulose and 0.3-0.5 part of a defoaming agent. The sum of the total parts by mass of the modified latex powder, the talcum powder, the calcium powder, the wollastonite, the precipitated barium sulphate, the titanium dioxide and the quartz powder is 100, and the modified latex powder is prepared by mixing ash calcium powder, superfine mineral powder and latex powder. The coating can overcome the defects of traces and color floating when an inorganic coating is mixed with a colored pigment.

The application discloses a production and preparation process of a heavy-duty water-based epoxy primer suitable for a high-salt and high-humidity environment, and relates to the technical field of water-based epoxy primer production. The raw materials are as follows: 30-50 parts of bisphenol A type water-based epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum tripolyphosphate, 10-15 parts of precipitated barium sulfate, 3-6 parts of silicon powder, 0.8-1.2 parts of a polyacrylic acid sodium salt dispersing agent, 0.4-0.8 parts of an organic silicon defoaming agent, 0.3-0.7 parts of an acrylic ester leveling agent and 0.6-1 part of a polyurethane thickening agent. The bentonite in the reinforced anti-settling agent and the modified phosphosilicate zirconium powder can improve the microstructure of the primer system, the coating is more compact, the primer can be conveniently applied to a high-salt and high-humidity environment, and the salt mist resistance of the water-based epoxy primer is enhanced.

The invention discloses a resourceful treatment and recovery method for high-concentration sulfate wastewater, and belongs to the technical field of sewage treatment. The method comprises the following steps: after being homogenized by a regulating tank, wastewater sequentially enters a coagulative precipitation tank I and an air floatation tank to remove suspended solids and colloids; lime milk is added into the primary sedimentation tank to precipitate most sulfate radicals, and a gypsum product is recycled; enabling the supernate to enter an advanced oxidation pond, and degrading organic matters by adopting alkali-activated sodium persulfate; the effluent passes through a secondary sedimentation tank, barium hydroxide is added to deeply precipitate sulfate radicals, and a high-purity barium sulfate product is recovered; and finally, adding sodium carbonate into the third-stage sedimentation tank to remove residual calcium ions, wherein the obtained high-quality effluent can be used as a recycled water resource. According to the method, graded conversion of sulfate radicals and collaborative recovery of gypsum and barium sulfate are realized through a cascade process of lime milk precipitation, advanced oxidation, barium salt precipitation and effluent reuse, and the method has the comprehensive advantages of low treatment cost, high product purity and environmental friendliness.

The invention relates to the technical field of titration in gold smelting, in particular to a method for eliminating interference of impurities in titration of sodium cyanide by using lead oxide as a pretreatment agent, which comprises the following steps: selectively precipitating low-valence interferents such as sulfide through a specific reaction of lead oxide in an alkaline leaching solution, so that a titration system is recovered to a measurable state; the method has the advantages that the method is simple, the measured sodium cyanide concentration is accurate, and the like.