The recycling technology of "low-temperature roasting - water dissolving - remanufacturing" for discarded lithium batteries is briefly introduced

On April 17, by the Chinese battery league, China association of electronic energy saving technology professional committee, the Chinese society for the study of high-tech industrialization, tsinghua university, Beijing university of technology, "the seventh auto motive battery recycling and secondary battery recycling and regeneration technology seminar" held ceremoniously in Beijing, lanzhou university of technology professor da-hui wang made at the meeting entitled "scrap lithium ion power battery" low-temperature roasting - water dissolving - remanufacturing recycling technology of speech. The following is the full text of the speech.

(the following content is based on the transcript of the scene, and has not been reviewed by the speaker. It is only for reference.)

Thank you, Mr. President, and good afternoon. I am a researcher from the state key laboratory of advanced processing and reuse of nonferrous metals, lanzhou university of technology. Now our team in the power battery recycling technology research results to give you a communication. This technology is aimed at the point where the scrapped batteries cannot be used in echelon, or in terms of recycling. This technology is mainly realized in three aspects, one is burning, the other is water soluble, and then remanufacturing, the characteristics of this technology hope to be introduced clearly through these three aspects. The first aspect is that I will talk about it a little faster. The first aspect is that the application field is very wide now. In terms of new energy vehicles and energy storage, power batteries are currently the focus of application.

At present, the state attaches great importance to the industry of new energy vehicles. Therefore, under the guidance of the state, the production and sales volume of new energy vehicles are increased by a very large amount. Power battery with the development of new energy vehicles, output also increased year by year, from the investment project of a power battery found online, it is to want to invest in chengdu to establish a base on new energy vehicles, this is in lanzhou district gree group invested in the construction of a new energy base, with the use of power battery, will certainly to BaoFeiQi, is a large amount of scrap, expect the 2026 recovery scale is very large. The power battery itself, or the electric vehicle itself is to solve the advantages of energy and environmental pollution, but if the battery is not recycled well, from the perspective of the government, it will affect the construction of a low-carbon society and an economically friendly society. For companies, not recycling power batteries would mean a big loss of business.

I'm not going to go through the Numbers. This is a series of policies formulated by the state on the recycling of power batteries in 2012-2018. Released on February 26 this year, including the state support batch released on March 3, nurturing a batch of benchmark enterprises. Enterprises in the power battery cascade utilization and recycling have done, the current is very large, processing capacity is also very large.

In terms of this recycling system, European, American and Japanese countries actually started earlier in terms of recycling network, and established their own recycling channels with industry associations and third-party companies.

Our country has also done a lot of work in the policy system of promoting the recycling of discarded batteries. At present, from the perspective of the country, the recycling of power batteries, including the industry, has formulated the cascade utilization in advance, and finally it is the link of resource utilization. In terms of technology, the fire method is widely adopted in foreign countries, while the wet method is mostly adopted in China.

On the left, it is typical for domestic recycling. This technology route has its advantages, running very stable and very mature. However, from the perspective of recycling cost and added value, we think it has room for improvement. So far waste lithium batteries from apart to acid dissolved in the separation of the element product is lithium carbonate, sulfate and so on to the precursor for hot forging, the right recycling enterprise temporarily not involved mainly to the carbonate, lithium carbonate and sulphate link, the product is the link, why this process implementation elements separation process is very complicated, the more complex the process means that the higher the cost of recycling, in order to improve, the domestic universities, research institutes and enterprises to do a lot of work, such as with other elements instead of inorganic acid, and physical Zhao Zong mentioned repair, I think these are very good technologies to fix, to improve on today's technology, and our lab has improved around this. What is the difference between the perspective of improvement and the technology mentioned above? The principle of technology. I think this technology is different from other technologies or has its advantages. The principle of technology is different. Reflect where, acid soluble link, fuse, we don't have to be at present to dissolved sulfate, we are the part of these materials are separate, separate later for manufacturing, product is no longer sulfate is given priority to, the road map, that is waste lithium batteries after dismantling, after dismantling element separation, this element separation and the link above though elements are separated, but the implementation is not the same, I just need to separate lithium, but on the other, through to manufacturing this conforms to the demand of battery anode materials, essence, this method is one of the pyrometallurgy. But, pyrometallurgy is a big type, which means that our method also belongs to the pyrometallurgy type, but at present, the recycling technology mentioned by other companies is different from the technical principle of pyrometallurgy, which is a new method of pyrometallurgy. This is some of our experimental phenomena in the process. We collected the disassembly of the waste battery, separated the materials of the positive electrode and the negative electrode, and burned them. After burning, we found that the color changed, which means that it happened correspondingly. , of course, this research, we not only do technology, in the process of this theory, in the declaration of national 973 project and national natural fund, etc., made a lot of theoretical research, what on earth is this process, the need to control, from the aspects of theory, we have done quite a lot of work, and finally formed the technology, we put forward its flow chart is what kind of, first to disassemble, after dismantling a surface to remove impurities, as I have to deal with the positive electrode material is mainly refers to three yuan, lithium manganese acid and so on, then calcined at low temperature, holds, then dissolve with water, After the solution is filtered, two kinds are obtained, one is the filter field, and the other is the filter residue. The filtrate passes through the recovery body, and then the filter residue is adjusted for processing. The filtrate gets the lithium carbonate solution, which is processed and then used as the raw material for the burning process. The technology we experience time is very long, actually began in 2008 to 2015 years to be fully integrated, patents, and this technology is closely related to the authorized in 2016, up to now the authorized 13 patents, this technology is closely related to this technology in the burning of temperature is less than six baidu, that is the highest burning to six baidu, actually very fast, is much less than an hour, burn is primarily to the water, of course from the purity of water is higher, the normal temperature water soluble, technology to improve to some engineering work, mainly including the process of calculation, the calculation and valuable components Material balance calculation and need of energy balance calculation and corresponding processing scale, the size of the main equipment design and selection of auxiliary equipment, including our processing scale corresponding to the amount of plant configuration Settings, this work is under way, we now have the corresponding complete, very detailed economic and technical analysis, now the work is going on, hope have a chance to give your boss a report, this is we are currently carrying out the work.

Now, we take the ownership of this technology as our school, and communicate with domestic industrial parks and enterprises based on this technology, hoping to reach cooperation and promote development. Thanks again for the exchange platform provided by the host and the conference. Thank you.

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