Waste lithium battery cathode chip recycling and processing equipment
Release Time：2022-11-17 Source：Battery Recycling Machine Share：
The production and sales of new energy vehicles are in a period of rapid growth, and the demand for nickel, cobalt and lithium is very large. Controlling the total amount of mineral resources alone is not the way to go, and we have to look for ways on other roads. The level of China's non-ferrous metal refining and processing is relatively advanced, although there is still room for improvement, but the magnitude of the improvement is very limited, and it is difficult to reduce the unit carbon emissions to achieve significant results. Changing the energy structure becomes a more feasible method.
The emergence of waste lithium battery recycling technology can not only make up for the problem of decreasing total mineral resources, for one thing, waste lithium battery recycling technology can recover these metals to achieve recycling, the main elements in the waste battery Fe, Al and Li are efficiently recovered. Secondly, it will not produce secondary pollution can also significantly improve economic efficiency. The treatment method of lithium battery cathode sheet and the recycling process of waste lithium battery, using the physical high-speed friction method of the technical process, effectively recovered copper, aluminum, plastic film in the waste lithium battery.
Waste lithium battery cathode sheet recycling treatment technology process.
1. charged lithium battery by poor oxygen crushing into poor oxygen heating volatilization, dual volatilization first for nitrogen-free thermal volatilization, can reduce the amount of nitrogen, the second channel for heating nitrogen volatilization and automatic extraction of volatile gas system (hot volatile material temperature is less than 140 degrees to avoid plastic film softening into a mass), volatilization to ensure that the oxygen content of 1% or less. Heating volatile use cracking combustion tail gas heating and charged lithium power generation heating, so as to achieve charged discharge and cracking tail gas waste heat reuse; and explosion-proof combustion system to improve the safety of equipment operation, the volatile electrolyte gas negative pressure lead to separate transport to cracking combustion system for heating (separate transport to prevent organic gas containing oxygen explosion), to achieve sorting waste gas and volatile gas comprehensive utilization.
2, comprehensive sorting cycle wind system: volatile lithium materials into the comprehensive sorting can be sorted into four categories of lithium batteries ① magnetic materials (iron and nickel) ② plastic diaphragm ③ copper block aluminum block stainless steel shell ④ positive and negative electrode sheet material; electrode sheet directly into the frictional depowdering equipment, sorting wind for full recycling; a small amount of exhaust gas into the cracking combustion system for supplemental oxygen use.
3, high-speed friction decomposition system: the pole piece into the high-speed operation friction rotor to generate strong airflow, so that the materials collide with each other friction, so that the positive and negative pole piece on the positive and negative pole powder from the metal foil off, off the copper and aluminum natural formation of small round particles, different materials in the friction of different particles formed in the powder, so that the separation rate of copper and aluminum foil and positive and negative pole powder reached more than 99%, and so that the copper and aluminum foil to form different particles and plastic almost No crushing, can be separated by screening; the friction decomposition wind recycling to reduce the exhaust gas and power consumption. Air flow classification of the positive and negative powder and copper and aluminum particles after the friction decomposition by wind adjustment, the positive and negative powder and metal particles for classification, reduce the screening load pressure.
4. The gas produced in cracking and crushing and volatile sorting produce various exhaust gases to complement each other, fully combusted in the combustion chamber, to achieve mutual combustion and full utilization of exhaust gases, combustion tail gas 400 degree residual heat by heat exchange to nitrogen and water liquid heating, so that the residual heat is used again to reduce production costs, the utilization rate of the entire assembly line exhaust gas is more than 90%, reducing the investment costs and operating costs of exhaust gas emissions and exhaust gas treatment. Costs. The exhaust gas after combustion is cooled, sprayed with two alkaline liquids and sprayed with one clear water to remove the trace powder, hydrogen fluoride and phosphorus fluoride from the exhaust gas, and then remove the water by aerosol separation, in order to ensure that the exhaust gas is harmless and discharged by adsorption to the standard.
5. The secondary use of charged recycling electricity. The charged lithium battery crushing into volatile discharge heat volatile electrolyte, as well as the pole powder in the cracking system again discharge heat, prompting the rapid cracking organic volatilization and cracking, charged recycling discharge heat is fully utilized.
6. Positive and negative electrode separation: separation of positive and negative electrode pieces after thermal volatilization sorting, [① according to the magnetic separation of positive and negative electrode pieces by strong magnetic separation to separate (strong magnetic separation can separate positive and negative electrode pieces purity of about 95%), ② hydrophilic and hydrophilic flotation method to separate positive and negative electrode, flotation selection flotation agent (kerosene as auxiliary collector) (methyl isobutyl methanol as foaming agent) in the best flotation (kerosene 0.12kg / t.) MIBC with 0.114kg/t, pulp solids concentration 10%). The lithium and cobalt content in the flotation recovered lithium cobaltate product is higher than 93%, and the difference of aerophilicity and hydrophilicity between lithium cobaltate and graphite in electrode material powder is separated and recovered by flotation]. After the separation of the electrode sheet, because the negative electrode sheet also contains lithium, the separated positive and negative electrode sheets need to be separated for wet lithium extraction, resulting in two sets of powder removal and lithium extraction equipment, thus increasing the equipment investment, the cost is relatively higher, and the significance of the recovery value is not too great; if the repair of cathode material is the main, it can be processed separately (but the ratios of cathode materials of different manufacturers of lithium electricity are different, and the treated cathode material cannot avoid the presence of other impurities, resulting in the repair of (But the ratio of different manufacturers of lithium battery cathode material is different, and the treated cathode material can not avoid the presence of other impurities, resulting in the repair of cathode material complexity, which brings greater difficulty and cost to repair, pole piece repair Tianjin Sedmax has overcome the technical bottleneck for industrialization).
The full set of waste lithium battery recycling processing de-powdering cracking technology process has been tested, the above waste lithium battery cathode material recycling processing method is not only simple and effective, low recycling cost, high efficiency and the advantages of the resulting product purity.
Waste lithium battery recycling equipment technology not only caters to the current development trend of power battery recycling , effectively regulates the requirements of power lithium battery recycling and treatment production line, construction assembly and acceptance, but also well implements the construction policy of green environmental protection, energy saving and emission reduction, avoids power battery waste and promotes the green intelligent ecological sustainable development of the industry.
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