39results about How to "Meet the requirements of clean production" patented technology

The invention relates to an aqueous environment-friendly insulation coating of anti-settling electric steel and a preparation method thereof. The insulation coating is formulated from the following components by mass percent: 20-60% of aluminium dihydrogen phosphate, 0.5-5% of silica solution, 1-10% of phosphoric acid, 0.3-2% of nitric acid, 1-5% of magnesium oxide, 0.3-5.5% of rare earth-salt blended solution, 0.5-5.5% of silane coupling agents, 3-20% of anti-settling additives, and the balance of solvent water. In the invention, conventional roller painting technology is adopted for coatingand then a film can be made by proper high-temperature solidification. By multiple actions of physical covering, chemical passivation, phosphorization and the like, a surface insulation coating of a cold rolling electric steel plate without orientation has the advantages of good adhesiveness, high insulativity (namely resistance and puncture voltage between high-rises), high corrosion resistance,high temperature resistance and the like, as well as environmental protection without chrome or harmful ions. The insulation coating is widely applicable to the surface coating of the cold rolling electric steel plate without orientation, has a better anti-settling property, better dispersity and a better levelling property, leads coating operation on site to be more convenient and faster, and can effectively avoid the segregation of paint ingredients and the fluctuation of coating performances.

The invention provides a method for extracting valuable metal elements in niobium-tantalum ore. The method comprises the following steps: (1) grinding the niobium-tantalum ore till the particle size is -200 to -500 meshes, and batching according to the mass ratio of the niobium-tantalum ore to concentrated sulfuric acid to disulfate being 1: (0.1-4):(0.1-4); (2) uniformly blending, and baking for 1-5 hours at the temperature of 200-800 DEG C to obtain a baked material; and (3) pickling the material obtained in the step (2) in sulfuric acid at the temperature of 30-100 DEG C, filtering, washing, and enabling niobium, tantalum and rare earth to enter a solution, wherein the concentration of the sulfuric acid is 0-40wt%, the leaching time is 1-4 hours. The method has the advantages that niobium, tantalum and rare earth elements are extracted simultaneously and efficiently, the leaching efficiency of the niobium and tantalum is above 95%, and the leaching efficiency of the rare earth element is approximate to 100%. The method is easy to operate and pollution-free and meets the requirements of environment-friendly metallurgy for cleaning production.

The invention provides a method for recycling zinc and iron in zinc oxygen pressure leaching slag. The method comprises the following steps that ingredient preparation is conducted according to mass ratio of zinc oxygen pressure leaching slag: concentrated sulfuric acid: bisulfate being 1: 0.4-2: 0.1-2; the ingredients are uniformly mixed, and roasting is conducted at 200-40 DEG C and lasts for 0.5-5 hours to obtain a roasted product; the roasted product is subjected to sulfuric acid solution leaching at 20-95 DEG C, concentration of the sulfuric acid solution is less than 5 wt%, and the leaching time is 0.5-4 hours; filtering is conducted, zinc and iron are placed into filter liquor I containing zinc and iron, iron powder is added into the filter liquor I containing zinc and iron, the Fe<3+> is restored to Fe<2+>, and filtering is conducted to obtain filter liquor II containing zinc and iron; and the filter liquor II containing zinc and iron is subjected to zinc extraction, and therefore zinc can be recycled. The rest liquor containing iron is subjected to evaporation, refrigeration and crystallization, and therefore byproduct ferrous sulfate heptahydrate crystal can be obtained.The zinc and iron in zinc oxygen pressure leaching slag can be efficiently extracted. The recycling rate of the zinc is greater than 96%, and the recycling rate of the iron is greater than 95%. The method has the advantages that recycling rate is high, operation is convenient, and energy consumption is low.

The invention provides a cyanide-free gold plating technology after nickel plating and priming of an electronic component. The cyanide-free gold plating technology comprises the following steps of: taking the electronic component, soaking in hydrochloric acid, cleaning, carrying out chemical polishing, cleaning, neutralizing, clamping, cleaning and removing oil; activating, and cleaning with deionized water; carrying out impact nickel plating, wherein the impact nickel plating temperature is (10-30) DEG C, and the current density is (1-8) A/dm2; carrying out nickel electroplating, wherein thenickel electroplating temperature is (40-55) DEG C, and the current density is (0.1-1) A/dm2; recycling, cleaning with deionized water, and activating; carrying out gold plating (putting into a tank with electricity), wherein the gold plating temperature is (38-45) DEG C, and the current density is (0.1-0.3 ) A/dm2; recycling, cleaning with deionized water, unloading a clamp, dewatering, and drying; and carrying out heat treatment and after treatment. According to the technology, a gold-plating layer on a nickel-plating layer has good bonding force and good coating performance.

The invention provides a method for efficiently recovering zinc and iron from a zinc ferrite-containing material. The method includes the following steps that the zinc ferrite-containing material is ground, and blending is performed according to the mass ratio of the zinc ferrite-containing material to sulfuric acid to sulfate being 1:(0.1-1):(0.01-1); the blended materials are mixed to be uniformand roasted for 0.5-4 hours at 150-400 DEG C; the roasted materials are subjected to agitation leaching for 0.5-4 hours at 25-90 DEG C, and filtration is performed to obtain a zinc-iron-containing solution and filtration residues; the zinc-iron-containing solution is subjected to iron removal through a goethite method to obtain goethite slag; and a zinc-containing solution obtained after iron removal is subjected to extraction electrodeposition to obtain an electrolytic zinc product, raffinate is cyclically subjected to agitation leaching, circuit opening is performed after many cycles for evaporative cooling crystallization to obtain sulfate crystals, and the sulfate crystals are returned to the blending section. The method can realize efficient decomposition, leaching and recovery of the zinc ferrite-containing material, the zinc recovery rate is greater than 98%, the iron recovery rate is greater than 95%, and the method has the advantages of being high in recovery rate, low in energy consumption, capable of recycling the solution and the like.

The invention discloses a method for synthesizing creatinol-o-phosphate, which comprises the steps as follows: (1) N-methyl-2-amino ethanol is taken as a raw material, and reacts with phosphoric acid so as to obtain N-methyl-2-amino ethanol phosphate ester; and (2) the N-methyl-2-amino ethanol phosphate ester obtained in the step (1) reacts with O-methyl isourea sulfate under an alkaline condition so as to obtain the creatinol-o-phosphate. The method is simple and feasible to operate, technological conditions are mild, the productivity and the purity of the obtained product are high, waste gas and waste acid are not generated during the whole process, the safety of equipment and operating staff are ensured, environment cannot be polluted, economical efficiency is achieved, and the requirements of clean production are satisfied.

The invention relates to an enzyme unhairing assistant in tanning production, particularly an enzyme unhairing assistant and a preparation method thereof. The enzyme unhairing assistant is prepared from effective quantities of potassium hydroxide, sodium percarbonate, sodium hydroxide, calcium hydroxide, composite phosphate and deionized water. The preparation method comprises the following steps: evenly mixing the sodium percarbonate and sodium hydroxide to prepare a mixture, preparing the calcium hydroxide into a 45-65 wt% water solution, adding the calcium hydroxide water solution and composite phosphate into the suspension prepared in the step A, adding the deionized water, stirring the room temperature, adding the potassium hydroxide and the rest of deionized water, and uniformly mixing to obtain the slightly alkaline enzyme unhairing assistant. The enzyme unhairing assistant solves the technical problem that the enzyme unhairing assistant in the prior art can not be easily popularized on a large area, can easily cause environmental pollution and the like, has the advantages of favorable unhairing effect, simple preparation method and the like, and satisfies the requirement for clean production in the unhairing process.

The invention discloses a method for one-step oxidation synthesis of 2-chloronicotinic acid. The method consists of: taking 2-chloro-3-dichloromethylpyridine as the raw material, adding alkali, using the mixture of water and a polar organic solvent as the solvent, adopting Ru/C as the catalyst, and carrying out oxygen oxidation to obtain a 2-chloronicotinic acid solution, then conducting acid precipitation, pumping filtration, washing and drying so as to obtain white solid powder 2-chloronicotinic acid. The method has the advantages of simple process, high yield up to 90% or more, use of oxygen as the oxidant, and environmental friendliness. The repeatedly applicable heterogeneous Ru/C catalyst is employed, and the product is easy to separate. The oxidation reaction system is a non-acidic system, overcomes the environmental pollution problem, and meets the requirements of clean production.

The invention discloses a pretreatment technology for linen fabric, and belongs to the technical field of the dyeing and finishing pretreatment in the textile processing. The pretreatment technology comprises the following steps: firstly padding the linen fabric in complex enzyme solution containing amylase, pectinase and a non-ionic surfactant, and through steaming and piling, washing, squeezing,ozone-processing, hot-washing, and cold-washing, finally drying. The treated fabric has not residual impurities of starch slurry, hemicellulose, xylogen and pectin and the like, the loss of strengthis small, and the fabric has the fluffy, thick and soft effects. Compared with a traditional technology, because of the application of biological enzyme and a physical pretreatment technology, the pollutant discharge is remarkably reduced, the technology is beneficial to the environmental protection, and a water supply volume of washing the fabric can be reduced. Especially the ozone treatment hasthe remarkable energy-saving and water-saving effects because the treatment is performed in a room temperature and a damp state.

The invention relates to a water-dispersible granule and a processing method for clean production thereof. A certain amount of urea is added to the formula of the water-dispersible granule, and after air-flow crushing, the medicinal powder is heated to make the medicinal powder in a hot-melt state. After being granulated, it can be transferred to the vibrating fluidized bed for cooling by cold air; the invention saves the process of drying and drying the fluidized bed in the traditional water-dispersible granule preparation process, which greatly saves energy consumption , better environmental protection. The invention can prepare water-dispersible granules containing epoxiconazole, dimethomorph, pymetrozine, azoxystrobin, imidacloprid and other active ingredients.

The invention discloses a method for continuously purifying a rubber vulcanization accelerator M by using a solvent, which comprises the following steps: adding a vulcanization accelerator M crude product into a toluene washing solution for perform purification, filtering, sending the filtrate into a toluene mother solution tank to cool and recover the accelerator M, distilling the residual mother solution to recover the toluene, washing the filter cake with the recovered toluene, and drying to obtain the rubber vulcanization accelerator M pure product, wherein the toluene washing solution cooled filtrate formed by washing the filter cake enters a washing solution collecting tank for extracting and purifying the vulcanization accelerator M crude product. The method is simple in process, and the toluene is recoverable, thereby reducing the total amount of the toluene mother solution, lowering the energy consumption and enhancing the yield. The method has the advantages of low cost and small environmental pollution, provides technical supports for continuous production of the accelerator M, has favorable economic and environmental benefits, and conforms to the requirements for national clean production.

The invention provides a method for reusing the by-product ammonia gas produced in production process of cationic blue X-BL. The production process of cationic blue X-BL comprises the preparation of the intermediate thiosemicarbazide and the intermediate 2-amino-1,3,4-thiadiazole. The method comprises the following concrete steps: applying a great amount of by-produced ammonia gas generated in a reaction for preparing thiosemicarbazide via an ammonia discharging process to a reaction vessel I, and when a reaction vessel II does not use ammonia gas, starting an air pump to bring the by-producedammonia gas to an ammonia absorption tower for generation of ammonia water which may be used as alkaline liquid for adjusting a pH value in the reaction vessel II; after completion of heating refluxof raw materials consisting of thiosemicarbazide, formic acid and hydrochloric acid in the reaction vessel II, opening a corresponding valve, introducing the by-produced ammonia gas or adding the ammonia water in the ammonia absorption tower and adjusting a pH value to 8-9; and carrying out cooling to obtain high-purity 2-amino-1,3,4-thiadiazole. The method of the invention effectively utilizes the by-product ammonia gas produced in production process of cationic blue X-BL, reduces the emission pollution of ammonia gas, reuses existing resources, has high product yield and is simple in operation.

The invention provides a method for comprehensively recovering valuable metals in goethite slag. The method comprises the following steps: levigating the goethite slag, and proportioning the goethiteslag, chlorine-containing salt and carbon powder according to the mass ratio of 1: (0.05-1.0): (0.05-1.0); uniformly mixing the proportioned materials, and pelletizing, wherein the pellet diameter is10-20 mm; roasting and volatilizing at 500-1100 DEG C for 1-6 hours; collecting zinc-indium-containing dust generated in the volatilization process, thereby obtaining the roasted product; and after the reaction finishes, cooling the roasted product to room temperature, and grinding to the particle size of undersize of a 200-mesh sieve; and carrying out magnetic separation on the ground material toobtain the iron ore concentrate product, wherein the magnetic field intensity is 160-350 mT. The method provided by the invention can implement high-efficiency volatilization recovery of valuable metals zinc and indium in the goethite slag in a low-temperature hot field, and is coupled with the magnetic field to obtain the iron ore concentrate product. The method has the characteristics of high valuable metal recovery rate, low energy consumption and the like, and is simple to operate.