Harmless treatment of the most abandoned lithium b

Harmless treatment of waste lithium batteries

waste lithium batteries contain a large number of non renewable and high economic value metal resources, such as cobalt, lithium, nickel, copper, aluminum, etc. if the waste or unqualified lithium batteries can be effectively recycled, it can not only reduce the pressure of waste batteries on the environment, but also avoid causing cobalt and Nickel 3 Avoid the waste of metal resources such as closing and reopening the refrigeration unit within 3 minutes

waste lithium batteries contain a large number of non renewable and high economic value metal resources, such as cobalt, lithium, nickel, copper, aluminum, etc. if the waste or unqualified lithium batteries can be effectively recycled, it can not only reduce the pressure of waste batteries on the environment, but also avoid the waste of cobalt, nickel and other metal resources

Changzhou Jinchuang Bofan new energy materials Co., Ltd. has cooperated with colleges and universities to establish a research group with Jiangsu Normal University of technology and Jiangsu Provincial Key Laboratory of precious metal deep processing technology and its application as the technical support. It has set up a project to study the recovery of valuable metals from waste lithium-ion batteries. After three years of research and development, it has solved the adverse factors such as complex operation, long process and the harm of organic solvents to the environment in production, and shortened the process flow, The power consumption is reduced, the metal recovery rate, purity and recovery amount are improved, and a fully enclosed clean recovery process and its application results of 8000 tons of waste lithium battery metal per year are formed

the project belongs to the application field of resource utilization of solid waste. The technical principle is to use hydrometallurgy technology for the separation of non-ferrous metals and the recovery of the characteristics of spring tension compression testing machine, including leaching, solution purification and enrichment, solvent extraction, etc. in addition, it also uses electrometallurgy technology, that is, electrowinning, to finally obtain elemental metal products

the technical route is: first, the waste lithium battery is pretreated, including discharge, disassembly, crushing and sorting; Recycling of disassembled plastic and iron shells; The sorted electrode materials are extracted after alkali leaching, acid leaching and impurity removal. Extraction is the key step, separating copper from cobalt and nickel; Copper enters the electrowinning tank for electrowinning to produce electrowinning copper products; The extracted cobalt and nickel solutions are extracted and separated. At this time, cobalt salt and nickel salt are directly obtained through crystallization and concentration; Or cobalt and nickel separated by extraction enter the electrowinning tank respectively to obtain electrowinning drill and electrowinning nickel products. The recovery rate of drilling, copper and nickel in the electrodeposition process is 99%, and the grades are 99.98%, 99.95% and 99.2% - 99.9% respectively. Cobalt sulfate and nickel sulfate products all meet the relevant standards

under the premise of optimized research results, the project will carry out large-scale and industrialized R & D and construction, build a fully enclosed and clean production line of waste lithium ions with an annual recovery of 8000 tons, and recover 1500 tons of cobalt, 1200 tons of copper and 420 tons of nickel, with a total output value of more than 400million yuan. The large-scale application of the wet recovery of heavy metals technology with a slight increase in tensile strength has not been seen at home and abroad. This achievement has a certain guiding role for the recycling of waste lithium battery metal resources in China, and has successfully filled the domestic gap; It is clean and environmentally friendly, with low cost and high profit, and has a great competitive advantage in similar enterprises

adopt the wet recovery process, integrate and simplify the process flow, and the whole process has low energy consumption and high product recovery rate. The leaching process adopts three times of reflux leaching to improve the leaching rate to 98.7%; Efficient copper and cobalt extractants extract and separate copper and cobalt, and integrate high concentration copper sulfate solution and cobalt sulfate solution to meet the process requirements of electrolytic deposition, and improve the efficiency of heavy metal recovery. The voltage and current density in the electrodeposition process are reduced to save power consumption. The recovery rate of the whole process is high, which is a high-value production process

in the electrowinning process, a small amount of sulfuric acid mist waste gas is collected and treated by negative pressure suction of the gas collector, which reduces the waste gas emission; After the electrowinning, the copper ion content is very low and the sulfuric acid concentration is increased. It is recycled as stripping washing solution or leaching solution, and the comprehensive utilization rate is high. The production process is mostly transported by pumps. All storage tanks, circulation tanks, washing tanks, extraction tanks and electrowinning tanks are closed. The process control is tight, and the degree of mechanization and automation is high, which reduces the loss of raw and auxiliary materials caused by running, emitting, dripping and leaking, and also reduces the unorganized discharge of pollutants

sulfuric acid mist and hydrochloric acid mist produced by electrowinning process and extraction process and perpendicular to the axis are treated by alkali spray absorption, with high removal rate and low waste gas emission. After treatment, the waste water is discharged up to the standard. The filter residue and waste residue are used as building materials such as cement and bricks. The solid waste treatment and disposal rate reaches 100%, and the pollution is discharged up to the standard

waste lithium batteries are hazardous wastes, but heavy metals are recovered from them, and finally high value-added products such as electrolytic cobalt, electrolytic copper and electrolytic nickel are obtained, which can be used as raw materials for lithium batteries. At the same time, a large-scale production line is formed, which better realizes the recycling of resources in the region. China is only in the research stage, and there are no reports of large-scale production

the project adopts the crushing separation leaching extraction electrowinning and concentration crystallization process to recover valuable metals such as copper, cobalt and nickel from waste lithium batteries. It not only optimizes each process, improves the acid leaching rate and product purity, but also integrates and reduces the process flow, reduces the complexity of process operation, reduces the recovery cost, and improves the flexibility of the process. Adjust the product types according to the market, and finally get high value-added products such as electrodeposited cobalt, electrodeposited copper and electrodeposited nickel, as well as raw materials for lithium batteries such as cobalt sulfate and nickel sulfate, realizing the recycling of resources. In addition, taking into account the waste gas, waste water, waste residue, etc. produced in the production process, we should add environmental protection treatment links to carry out cleaner production, so as to achieve the goal of pollution discharge up to the standard. The scientific and technological achievements of the project were identified by an expert group organized by the China Association for comprehensive utilization of resources, and the level was determined to be internationally leading