200 results about "Precipitated sulphur" patented technology

The invention relates to the technical field of coatings, and particularly discloses a water-based DTM polyurethane coating and a preparation method thereof. The water-based DTM polyurethane coating is prepared from a component A and a component B. The component A is prepared from, by mass, 40-60 parts of hydroxyl acrylic acid dispersion, 15-20 parts of titanium dioxide, 3-5 parts of modified zincphosphate, 3-5 parts of zinc aluminum phosphate, 5-10 parts of precipitated barium sulfate, 1-2 parts of a salt spray resistant auxiliary agent, 0.5-1 part of an anti-flash-rust auxiliary agent, 1-2parts of a dispersant, 0.2-0.4 parts of a defoaming agent, 0.5-1 part of a wetting leveling agent, 0.2-0.5 parts of a thickening agent, 2-5 parts of a coalescing agent, and 5-10 parts of deionized water. The component B is prepared from 10-25 parts of a water-based isocyanate curing agent. The coating provided by the invention is low in VOC content, has good water resistance, acid and alkali resistance, artificial aging resistance and salt spray resistance, and can meet the requirements of corrosion resistance and weather resistance.

The invention relates to a preparation method for an aqueous floor coating. The aqueous floor coating is prepared from the components in parts by weight of 80-100 parts of a component A and 40-50 parts of a component B, wherein the component A is prepared from the following components in parts by weight of 30-35 parts of water, 15-25 parts of an aqueous epoxy curing agent, 1-3 parts of an adjuvant, 0.1-0.7 part of an antifoaming agent, 10-15 parts of quartz powder, 5-10 parts of precipitated barium sulfate and 0.2-0.8 part of a thickening agent; the component B is prepared from the following raw materials in parts by weight of 15-18 parts of liquid epoxy resin, 1-3 parts of a reactive diluent and 3-4 parts of an environment-friendly type organic solvent. The preparation method comprises the following steps: dispersing the raw materials of the component A at a high speed of 1000-2000rpm for 5-10 minutes; grinding the raw materials of the component A until the fitness is 10-30 microns; mixing the raw materials with the residual water at a speed of 500-800rpm for 3-10 minutes, so as to obtain the component A; mixing the raw materials of the component B at a speed of 200-600rpm for 10-20 minutes, so as to obtain the component B; mixing the component A and the component B at a ratio ranging from 1:1 to 1:3, so as to obtain the aqueous floor coating. The aqueous floor coating can avoid the environment pollution and damage on human health, has strong air permeability, is applicable to wet basal plane, and meets the requirements on the environmental friendliness.

A system and method for reclaiming nutrients from dairy manure includes a centrifuge for separating a liquid fraction of the manure from a solid fraction comprising organic material; a mechanical vapor recompression evaporator (“MVR”) to receive the liquid fraction from the centrifuge and evaporating the liquid fraction by mechanical vapor recompression to produce ammonia-laden water vapor and a concentrated nutrient slurry; a dryer for drying the nutrient slurry to a selected moisture content to be available as an ingredient in compounded fertilizer; and an ammonia stripping tower assembly to receive ammonia-laden water vapor from the MVR and from it to precipitate ammonium sulphate salt and condense water as separate products.

The invention discloses a method for recovering rhodium from a homogeneous waste catalyst containing rhodium. The method of acidification oxidation-complex precipitation-sulfide precipitation is adopted. Firstly acidification-oxidation is adopted to interrupt the 'bridging' of rhodium in rhodium-phosphine catalyst in the waste catalyst, and then a specific complexing precipitant is adopted to generate a complex precipitate of rhodium, so that the recovery rate of rhodium reaches 95.23% in one step, the main body of rhodium in the waste catalyst is recovered in one step, the dispersion of the rhodium is effectively reduced, and the recovery rate of the rhodium is improved; and in addition, in the acidification-oxidation process step, a small part of rhodium is directly oxidized into Rh3+, the part is recovered by a vulcanization precipitation method, and the final recovery rate of the rhodium can reach more than 97% by combination of the two kinds of recovery. The complex precipitate and the sulfide precipitate generated in the recovery process are easy to treat, toxic substances are not generated, and the method is safe, green and environmentally friendly.

The invention discloses a chemical magnesium removal method for collophanite and free of tailings, and belongs to the technical field of phosphorite magnesium removal. According to the method, dilutedhydrochloric acid is used for chemical magnesium removal, and phosphate concentrate, CO2 and magnesium removal liquid are obtained. The method comprises the steps: introducing CO2 into a NaOH solution to obtain a sodium carbonate solution; mixing the sodium carbonate solution with calcium sulfate for reaction to obtain a sodium sulfate solution and light calcium carbonate; adding sulfuric acid into the magnesium-removed solution to precipitate calcium sulfate to obtain calcium sulfate and a diluted hydrochloric acid solution containing phosphorus and magnesium, wherein the hydrochloric acid solution is used for preparing diluted hydrochloric acid and continuously used for removing magnesium from collophanite, and the process is repeated; when the molar concentration of calcium ions in themagnesium removal solution and the molar concentration of phosphate radicals reach 3: 2, precipitating calcium sulfate by using a sodium sulfate solution, adding ammonia water into the obtained filtrate to adjust the pH value, and precipitating to obtain a nitrogen-magnesium-phosphorus fertilizer and a phosphorus precipitation filtrate; adding a sodium carbonate solution into the phosphorus precipitation filtrate to obtain magnesium carbonate and a sodium chloride solution; and concentrating and crystallizing the sodium chloride solution to obtain sodium chloride.

A process for making polyol alkyl ether involving: (a) providing a polyol; (b) deprotonating the polyol with a base to form a first reaction product; (c) continuously removing water from the first reaction product to form a second reaction product; (d) providing an alk(en)yl (ether) sulfate; (e) reacting the alk(en)yl (ether) sulfate with the second reaction product to form a third reaction product containing a sulfate salt; (f) precipitating the sulfate salt from the third reaction product by adding from about 10 to 20 mol of water per mol of alk(en)yl (ether) sulfate to the third reaction product, at a temperature of from about 50 to 100° C.; (g) forming an aqueous and / or solid phase containing the polyol alkyl ether; and (h) separating the polyol alkyl ether from the aqueous and / or solid phase.

The invention belongs to the field of metallic barium compounds, and particularly relates to a preparation method of extinction barium, which comprises the following steps: a. selecting barite with the barium content of higher than 95%, cleaning, and airing; b. pulverizing the aired barite, carrying out Raymond milling on a Raymond mill to obtain a product A of which the granularity is up to 400-500 meshes; c. adding sodium polyacrylate dispersing agent and allyl phenoxyacetate into the product A, and milling with a sand mill while controlling the particle diameter of the mixture within 5-10 mu m, thereby obtaining a product B; and d. adding calcium carbonate, titanium dioxide and allyl phenoxyacetate into the product B, and thoroughly mixing to obtain the extinction barium product. The method provided by the invention does not need heating, thereby saving the burning coal and being beneficial to energy saving and emission reduction; and no toxic or harmful substances are generated inthe production process. Compared with the prior art, the high-dispersivity precipitated barium sulfate provided by the invention has the advantages of small granularity, high dispersivity, low cost, and low environmental pollution in the production process.

The invention discloses a formula of high-glossiness filled PP. The formula comprises the following components, by weight, 31-65 parts of PP, 30-60 parts of barium sulfate, 0.5-1.5 parts of a titanate coupling agent, 0.2-1 part of an antioxidant, 0.5-1 part of a lubricant, 3-5 parts of POE (polyethylene octene elastomer), and 0.5-1 part of other processing assistants. The invention also discloses a preparation method of the high-glossiness filled PP. The preparation method comprises the following steps: 1, stirring the raw material barium sulfate, and adding the titanate coupling agent drop by drop to obtain a processed precipitate barium sulfate; 2, stirring the raw material PP, adding white oil, adding the oxidant, the lubricant and other processing assistants, adding the POE, finally adding the processed precipitate barium sulfate, and stirring to obtain semi-finished filled PP; and 4, extruding the semi-finished filled PP, cooling, and pelletizing to obtain the filled PP. The filled PP produced in the invention has the advantages of good appearance, uniform dispersion, high glossiness, good physical properties, and long service life.