Views: 266 Author: Site Editor Publish Time: 2024-05-06 Origin: Site
| Wastewater Type | Recycling and recycling of lithium batteries |
| Implementation time | |
| Processing scale | 120m3/h |
| Project name | Zhejiang New Era Zhongneng Technology Wastewater Station Project |
| Product name | RDAF High Efficiency Dissolved Air Flotation |
| Process |
Zhejiang Xinshidai Zhongneng Technology Co., Ltd. was established in 2015. It focuses on providing high-value services to the new energy industry, carrying out exceptional businesses such as the cascade recovery and recycling of retired power lithium batteries, and promoting the closed-loop circulation of resources. It is a dual-license enterprise of the Ministry of Industry and Information Technology's "Industry Standard Conditions for Comprehensive Utilization of Waste Power Batteries of New Energy Vehicles" (allowlist), a national-level specialized and new small giant enterprise, a high-tech enterprise, a green factory in Shaoxing City, one of the top 100 industrial enterprises in Shangyu District, and a hidden champion enterprise.
The company's retired lithium battery and cobalt-nickel resource recycling project has been completed. It now has two production bases in Shangyu, Shaoxing, and Shangrao, Jiangxi. It has an annual production capacity of 12,000 metal tons of cobalt salts, 10,000 metal tons of nickel salts, 5,000 tons of manganese tetraoxide, 8,000 tons of lithium carbonate, and 3,000 tons of iron phosphate. It can dismantle 50,000 tons of retired lithium batteries annually. The process technology is mature, the degree of automation and environmental protection level is high, and the cost is relatively reasonable.
Retired lithium batteries can improve the resource recycling rate through cascade utilization and recycling. In the recycling process of retired lithium batteries, the commonly used pyrometallurgical and wet processes have advantages and disadvantages. The primary pollutants of the pyrometallurgical process are waste gas, and the primary pollutants of the soaking process are wastewater.
The wet process has low energy consumption, high recovery rate, and product purity, so it is widely recognized. Its main steps include pretreatment, acid/alkali leaching, leaching liquid impurity removal, separation and extraction, and element precipitation. The core of the wet process is the leaching of metal materials, using inorganic acid or organic acid to recover metals in the form of ions into the acid solution.
The wastewater in the positive electrode workshop mainly comes from the acid leaching process, and its main components are sodium sulfate, sodium phosphate, copper, iron, aluminum, fluoride, etc.; the wastewater in the negative electrode workshop mainly comes from the copper foil washing and pickling process, and the main components of the pickling wastewater are iron sulfate, copper sulfate, sodium sulfate, aluminum sulfate, etc. These acidic wastewaters are pre-treated by adding liquid alkali, and the precipitate residue is produced through a neutralization reaction to remove copper, iron, aluminum, fluoride, sulfate, etc., in the wastewater. After filtration, the wastewater enters the comprehensive wastewater treatment system for treatment. The washing wastewater generated in the negative electrode workshop directly enters the comprehensive wastewater treatment system.
The high-efficiency dissolved air flotation produced by our factory is used in this project to control the end of wastewater discharge. After the pH of the slurry is adjusted at the sewage treatment station, it is first coagulated and precipitated, and then flotation is used. This can effectively remove most fluoride ions in the slurry and control the fluoride ion content within the industry standard of 5ppm. The process is simple, occupies a small area, and is costless.
