57results about How to "No solid waste generated" patented technology

The invention discloses a method for removing arsenic and antimony from zinc smelting leach liquor, and relates to a method for removing arsenic and antimony from a solution produced during zinc smelting by purifying. The method is characterized by comprising the following steps: comprehensively recovering valuable components of zinc, indium, iron and the like by purifying in an arsenic and antimony removing process consisting of pre-reduction, neutralization of precipitated indium and a hematite process under the condition that zinc smelting low-acid leach liquor is taken as a raw material; turning high-valence iron into low-valence iron by taking zinc concentrate, zinc sulfite, sulfur dioxide and the like as reducing agents in the low-acid leach liquor, wherein the content of high-valence iron (Fe<3+>) in the reduced liquor is lower than 2g / L; performing two-stage neutralization by using lime, limestone, secondary zinc oxide, calcined sand and zinc oxide to regulate the pH value of reduced liquor to 4.0-5.4 in order to enrich indium precipitate; and removing arsenic and antimony from indium-precipitated liquor to fulfill the aim of efficiently cleaning and purifying the solution. The method has the advantages of high indium metal recovery rate, high arsenic and antimony removing rates, small residue amount, stable performance and environmental friendliness.

The invention discloses a method for extracting aluminum, silicon oxide and rare earth from waste rare earth polishing powder. The method comprises the following steps that (1) strong acid is added into the pretreated waste rare earth polishing powder, the aluminum and the rare earth are dissolved, and silicon oxide powder is left in leaching residues; (2) the leaching residues containing the silicon oxide powder are washed and purified so as to obtain the silicon oxide powder; (3) a precipitant is added into a leachate so as to precipitate the rare earth, and filtering is carried out so as toobtain a rare earth salt and an aluminum salt solution; (4) after the aluminum salt solution is neutralized, standing and settling are carried out for 2-12 hours so as to obtain an aluminum-containing product; and (5) the rare-earth salt is subjected to fluorination and is burnt so as to prepare rare earth polishing powder. According to the method, silicon, aluminum and the rare earth in the waste rare earth polishing powder are comprehensively recovered to form the superfine silicon oxide powder, the aluminum salt and the rare earth polishing powder, no solid waste is generated, and all valuable elements are utilized.

The invention belongs to the field of chemical engineering and particularly relates to a method of decomposing phosphate tailings by hydrochloric acid to produce Mg(OH)2 and CaSO4. The method includes the steps of: soaking the phosphate tailings in hydrochloric acid and water to perform a complete mixing reaction, and performing primary filtration to obtain a mother liquid (I); adding diluted sulfuric acid to the mother liquid (I) and performing secondary filtration to obtain a mother liquid (II) and filter cake, water-washing and crystallizing the filter cake to generate CaSO4 crystal whiskers; adding ammonia water to the mother liquid (II) to perform primary and secondary neutralization to obtain a Mg(OH)2 product and a mother liquid (IV); and mixing the mother liquid (IV) with residue (II), which is generated in primary neutralization, to produce ammonium chloride-phosphate. With the phosphate tailings and hydrochloric acid as raw materials, the method can produce the Mg(OH)2 and CaSO4 and can by-produce the ammonium chloride-phosphate. The whole process is simple and is in a total-closed circulating manner. The method can turn waste into resources and achieves clean production.

The invention provides a method for synthesizing p-aminobenzamide, comprising the steps of: 1) taking a container, adding p-nitrobenzoic acid, triphosgene and a solvent, after the reaction is completed, collecting the solvent to obtain p-nitrobenzoyl chloride; ) take another reaction vessel, add ammonia and phase transfer catalyst, drop p-nitrobenzoyl chloride toluene solution to obtain p-nitrobenzamide; 3) take the reaction kettle, add p-nitrobenzamide, and add water, Catalyst, obtains described p-aminobenzamide. In the method, the amount of raw materials used is small and the reaction speed is fast. After the hydrogen chloride gas produced by the reaction is absorbed into hydrochloric acid by water, it can be used for other purposes, which effectively reduces the production cost. In the reduction reaction, the iron powder method is replaced by the hydrogenation method, so that the production The cost is reduced, no solid waste is generated, the labor load is greatly reduced, the process is environmentally friendly, and the economic benefit is good.

The invention provides a preparation method of battery-grade iron phosphate. The preparation method comprises the following steps: adding high-purity iron powder into hydrochloric acid with a proper concentration, and carrying out a reaction until the iron powder is not dissolved any more; filtering, adding a proper amount of hydrogen peroxide, and reacting until no ferrous ions exist in the reaction solution; adding phosphoric acid, uniformly stirring, and carrying out spray drying to obtain iron phosphate dihydrate; and sintering at a high temperature to remove crystal water to obtain anhydrous iron phosphate. According to the invention, the method comprises the steps of ferrous solution synthesis, oxidation, ferric phosphate dihydrate synthesis and high-temperature sintering, so that the procedures of ferric phosphate precipitation, aging, filtering, washing and the like are reduced, the procedures are reduced, the flow is shortened, the production period is shortened, the production efficiency is improved, water resources are saved, and the cost is low; the raw materials are recycled, no solid waste is generated, and the cost is reduced; and a neutralizer is not needed, the useof raw materials is reduced, the opportunity of impurity introduction is reduced, the obtained product is high in purity and low in impurity content, and the market requirements of battery-grade rawmaterials can be well met.

The invention discloses a method for producing intensive bus ducts. According to the method for producing the intensive bus ducts, disclosed by the invention, the intensive bus ducts are riveted into a whole through dedicated riveting equipment, a riveting technology of the dedicated riveting equipment is verified through a tension test, 4000-N tension force can be borne by riveting bodies of shells of the intensive bus ducts, the riveting bodies can be separated by a tension force which is greater than 4000N, and the riveting strength is reliable; riveting contact surfaces are in close contact while the riveting strength is reliable, the effect of heat transfer during load operation of the intensive bus ducts is enhanced, the temperature rise of the intensive bus ducts during normal use is effectively reduced, the electric conductivity of a busbar of the intensive bus ducts is increased, the working efficiency of the intensive bus ducts is ensured, and looseness due to vibration during transit cannot be generated.

The invention discloses a treatment method of spray washing water in an activated carbon production process, and belongs to the technical field of wastewater treatment, and the method includes: 1, chemical precipitation, to be more specific, adding magnesium ions to form a precipitate, and performing solid-liquid separation to obtain a liquid phase entering the next step for treatment; 2, magneticflocculation and sedimentation, to be more specific, adding a flocculant and magnetic powder for flocculation and sedimentation, and performing magnetic separation to obtain a liquid phase entering the next step for treatment; and 3, persulfate oxidative degradation, to be more specific, adding a persulfate for reaction, wherein after the reaction is sufficient, macromolecular organic matters arebasically removed, and ammonia nitrogen and total phosphorus contents are low, and residual organic matters are small molecular components. The treatment method is used for treating the spray washingwater containing a large amount of tar and phosphoric acid and a relatively high concentration of the ammonia nitrogen in the activated carbon production process, can effectively remove the higher concentration of the ammonia nitrogen and total phosphorus in wastewater, and has high efficiency, simple process and reaction, mild and easy-to-control conditions and other characteristics.

The invention discloses a production process of glycine. The production process comprises the following steps of: S1, performing ammonification; S2, performing alkaline hydrolysis ammonia distillation; S3, performing decolorizing with activated carbon; S4, performing ion exchange acidification separation, specifically, performing ion exchange reaction on metal ions of discolored glycinate and H < + > on ion exchange resin to generate glycine, discharging the glycine out of a system along with an aqueous solution, performing ion exchange reaction on iminodiacetic acid disalt and the H < + > to generate iminodiacetic acid monosalt, adsorbing the iminodiacetic acid monosalt on the resin, discharging the iminodiacetic acid monosalt and an inorganic salt solution generated in a resin regeneration process out of the system; S5, concentrating and crystallizing glycine, and when the iminodiacetic acid monosalt in circulating mother liquor is accumulated to 10% or above of the total solute, pumping out the mother liquor, concentrating and crystallizing the inorganic salt, and when iminodiacetic acid monosalt in the solute of the circulating mother liquor is accumulated to 15% or above of the total solute, extracting the mother liquor; S6, mixing the extracted mother liquor, and carrying out continuous chromatographic separation; and S7, recycling the iminodiacetic acid. The production process of the glycine provided by the invention has good glycine synthesis and separation effects.

The invention discloses a method for producing zinc oxide for ceramic glaze by using hot-dip galvanizing ash, which comprises the following steps: wet ball milling, filtering to remove iron, wet dechlorination, drying and calcining, wherein zinc in the hot-dip galvanizing ash is recovered in the form of zinc oxide which can be directly applied to the ceramic glaze. According to the method, the dechlorinated zinc ash is directly dried and calcined to prepare a zinc oxide product, high-temperature reduction volatilization and reoxidation are not needed, the recovery rate of zinc is increased and can reach 99%, meanwhile, a large amount of energy materials such as high-quality anthracite (or coke powder) are saved, the production cost is reduced, and good economic benefits are achieved; and the production process is clean and environment-friendly, no solid waste is generated in the whole process, no smoke is discharged, zero wastewater is discharged, good environment-friendly benefits are achieved, and the prepared zinc oxide is large in specific gravity, good in flowability, low in volatile matter and capable of being directly applied to the ceramic glaze industry.

The invention discloses a device and a method for removing organic sulfur and inorganic sulfur in coal gas by a wet method. The device comprises a supergravity rotating bed, a coal gas liquid removal tank, a blade separator, a desulfurizing agent buffer tank, a desulfurizing agent sedimentation tank and a fresh desulfurizing agent preparation tank, the method comprises the following steps: S1, removing organic sulfur and inorganic sulfur in sulfur-containing coal gas; s2, treating and utilizing the desulfurized rich desulfurizer; and S3, removing liquid drops entrained in the desulfurized coal gas, and recovering the desulfurizer. The device and the method can solve the problems of large gas pressure loss, high energy consumption, high desulfurization cost and difficulty in solid waste treatment in a dry desulfurization process, and the problems of short service life of a solid hydrolysis catalyst, high desulfurization cost and difficulty in waste liquid treatment in a semi-dry desulfurization process, so that the effects of short process route, small equipment quantity, low device investment, simplicity and convenience in operation and low cost are achieved. The treated coal gas has no pressure loss, the liquid desulfurizing agent is automatically and continuously replaced, no waste gas or solid waste is generated, and the desulfurization cost is low.

The invention provides a desulfurization wastewater zero discharging process with a carbon dioxide method. The process comprises the following steps: collecting desulfurization wastewater; performing a pH primary reaction; adjusting the pH value to an alkaline condition by adding lime, so as to precipitate magnesium ions, fluoride ions, sulfate ions and heavy metal ions; finally, enabling chlorine ions and ammonia gas to react through an organic substance catalytic reaction, so as to obtain an ammonium chloride product. According to the process, the problem that the wastewater cannot be recycled as the desulfurization wastewater is high in the content of chlorine ions is solved.

The invention discloses a method for reducing dehydrolincomycin in lincomycin hydrochloride, and the method comprises the following steps: S1, dissolving lincomycin hydrochloride in purified water with the weight of 2 to 4 times of the weight of the lincomycin hydrochloride to obtain an aqueous solution; S2, adding a Raney nickel catalyst with the weight of 1 / 10 of the weight of the lincomycin hydrochloride to the aqueous solution of the step S1; S3, introducing hydrogen into the aqueous solution of the step S2 for reaction for 6-8h to obtain a reaction liquid; S4, filtering the reaction liquid to filter out the Raney nickel catalyst to obtain a filtrate; S5, using purified water to wash the reaction liquid attached to the surface of the Raney nickel catalyst away to obtain a washing liquid; and S6, combining the filtrate and the washing liquid, and crystallizing to obtain the lincomycin hydrochloride; the method adopts the Raney nickel catalyst for hydrogenation reaction, the cost issuccessfully reduced, and the method is suitable for industrial production; the hydrogenation reaction is carried out under normal pressure, and the safety production coefficient is improved.

The invention relates to a production method of water-soluble monoammonium phosphate, which belongs to the technical field of clean processing and utilization of phosphate rock. A method for producing water-soluble monoammonium phosphate, comprising the following steps: a. mixing nitric acid and rock phosphate, reacting at 30-70°C for 0.5-2 hours, and separating solid and liquid to obtain an acidolysis solution; b. and until the pH is 6.5-8, solid-liquid separation, solid phase I and liquid phase I are obtained; c, solid phase I and sulfuric acid solution are mixed, 30-70 ° C for 0.3-2h, solid-liquid separation, solid phase II and Liquid phase II; neutralize the liquid phase II until the pH is 4.0-4.5, and then separate the solid and liquid to obtain solid phase III and liquid phase III; wherein, the liquid phase III is water-soluble monoammonium phosphate after processing. The method of the invention completely separates phosphorus and calcium in the phosphate rock, greatly improves the utilization rate of elements such as calcium and phosphorus, and can directly produce water-soluble monoammonium phosphate.