43results about How to "Single process" patented technology

A method for extracting lithium salt in an aluminum electrolyte by fluorination roasting and acid leaching, belonging to the technical field of inorganic chemistry, comprising the following steps: step 1: mixing materials; step 2: fluorination roasting; step 3: (1) acid leaching, Filter to obtain primary filtrate and primary filtrate; (2) process primary filtrate and primary filtrate respectively to obtain secondary filtrate and secondary filtrate; (3) process secondary filtrate and secondary filtrate respectively to obtain three times filtrate and Three times of filtrate; (4) process three times of filtrate and three times of filtrate respectively. The method of the present invention can effectively extract the lithium element in the electrolyte, reduce the energy consumption of electrolytic aluminum production; recycle high value-added lithium carbonate chemical raw materials, all of which are common raw materials in the chemical industry, and the comprehensive average extraction cost is low; can separate a variety of Substances, the purity of the obtained substances is high; it solves the problem of the influence of lithium elements for the aluminum electrolysis industry, also increases the benefits, and improves the comprehensive level of my country's aluminum electrolysis industry.

The invention relates to a method for preparing FexPO4 by electrolyzing ferrophosphorus, which comprises the following steps: by using ferrophosphorus as the anode and providing an oxygen source by using oxygen in water as the product, electrolyzing to obtain a FexPO4 solution, wherein only ferrophosphorus and water are consumed in the reaction process; adding basic oxides to regulate the pH value of the solution so as to settle out FexPO4; and granulating, filtering and washing to obtain the finished FexPO4 product. In the method, cheap ferrophosphorus is converted into high-value FexPO4 by using the electrolytic reaction process; the source of ferrophosphorus is not limited; the influence of impurity elements on the product can be eliminated; the product can be granulated into controlled shape and particle size; the byproduct H2 can be recycled; the treated filtrate can be used cyclically; the obtained finished FexPO4 product has the advantages of high purity, small particle size, easily controlled shape, and low power consumption; the reaction process has low requirements for equipment and is easy to operate; and the preparation method has the advantages of simple technique, high resource utilization rate, low cost, low investment, good benefit, high cleanness and environmental protection, can be easily industrialized, and is suitable for high-value comprehensive utilization of byproducts in chemical industry and large-scale industrial low-cost clean production of high-end phosphates.

The invention discloses a harmlessness and reclamation treatment method of aluminum scrap electrolyte and belongs to the technical field of inorganic chemistry. The method comprises the main steps that 1, aluminum scraps are electrolyzed and subjected to crushing and screening, and aluminum electrolyte particles are obtained; 2, acid liquor with the concentration of 1 mol / L and an aluminum salt solution with the concentration of 1 mol / L are prepared for standby application; 3, the aluminum electrolyte particles obtained in the step 1 are placed in the acid liquor prepared in the step 2 and leached on the heating and stirring conditions, the PH of the solution is controlled to be smaller than 5, when the fluorinion leaching rate is higher than 94%, leaching is finished, impurities are filtered, and a leaching solution is obtained; 4, the aluminum salt solution prepared in the step 2 is added to the leaching solution in the step 3, the mixture is heated and stirred, Al3+ / Na+ is controlled to be larger than 0.3, when sediment is generated in the solution, the solution is filtered, filter residues and filter liquor are obtained, and the filter residues are washed and dried to obtain alkali type aluminum fluoride products; and 5, the filter liquor in the step 4 is evaporated and crystallized to obtain sodium salt products.

The invention discloses a method for refining and purifying caprolactam. Through crystallizing low-water-content crude caprolactam at a constant temperature, one part of caprolactam with high qualityis obtained, through crystallizing room-temperature-crystallization high-water-content mother liquor at a low temperature and then performing distillation, the other part of caprolactam with high quality is obtained, wherein the low-temperature-crystallization mother liquor is evaporated to obtain circulation materials which participate in constant-temperature crystallization. A constant-temperature and low-temperature combined crystallization way is adopted and is matched with distillation and evaporation processes to realize the efficient refining and purification of the caprolactam. The constant-temperature and low-temperature crystallization has the advantages of low energy consumption, small effluent discharge, lowered production cost and improved safety. The method has the advantagesof high product yield, short technical process and low equipment investment. No inorganic solvent is used, the process is simple, and production cost is greatly lowered. The obtained caprolactam hasgood quality, each index is superior to the standard of a national standard premium grade; three waste (waste gas, waste water, industrial residue) discharge amount is small, and environment pollutionis low.

The invention discloses a harmless separating method of a waste cathode carbon block in aluminum electrolysis, and belongs to the technical field of inorganic chemicals. The method comprises the mainsteps of S1, crushing and screening the waste cathode carbon block in aluminum electrolysis to obtain carbon block particles; S2, preparing 1mol / L by concentration of acid liquid for later use; S3, leaching the carbon block particles obtained in step S1 in the acid liquid prepared in step S2 under heating and stirring conditions to obtain a leaching solution; S4, filtering the leaching solution obtained in step S3; separating filtrate and filter residues; and washing and drying the filter residues to obtain a carbon powder product; S5, adding the filtrate obtained in step S4 to a salt solution, and performing fluorine deposition to obtain a fluorine deposition solution; and S6, filtering the fluorine deposition solution obtained in step S5; separating the filtrate and a filter cake; and washing and drying the filter cake to obtain an alkaline metal fluoride product. With the adoption of the method, high-purity aluminum electrolyte applicable to industrial aluminum electrolysis production can be obtained; and villiaumite is recovered, so that the whole process is free from wastes.