Continuous leaching system for anode powder of waste lithium batteries and leaching technology

Abstract

The invention provides a continuous leaching system for anode powder of waste lithium batteries. The continuous leaching system comprises a first reaction kettle, a second reaction kettle, a stirringtank, a first continuous solid-liquid separator, a second continuous solid-liquid separator, a third continuous solid-liquid separator, a pickle liquor storage tank and a waste residue storage tank; the first reaction kettle is connected with the first continuous solid-liquid separator through a first pipeline; the second reaction kettle is connected with the second continuous solid-liquid separator through a second pipeline; the stirring tank is connected with the third continuous solid-liquid separator through a third pipeline; the first continuous solid-liquid separator is connected with the pickle liquor storage tank through a fourth pipeline and is connected with the second reaction kettle through a fifth pipeline; the second continuous solid-liquid separator is connected with the first reaction kettle through a sixth pipeline and is connected with the stirring tank through a seventh pipeline; the third continuous solid-liquid separator is connected with the second reaction kettlethrough an eighth pipeline and is connected with the waste residue storage tank through a ninth pipeline. The continuous leaching system is high in leaching rate and is capable of solving the problemof excessive dosage of sulfuric acid.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium batteries, in particular to a continuous leaching system and leaching process for positive electrode powder of waste lithium batteries. Background technique [0002] With the rapid development of the new energy industry, the application range and market size of lithium-ion batteries are increasing year by year. With the increasing scarcity of natural resources such as lithium nickel cobalt, the price of lithium nickel cobalt salt, which is a raw material for batteries, has increased rapidly. Therefore, the lithium-nickel-cobalt resource market based on the recycling of waste lithium-ion batteries will become larger and larger. [0003] At present, in China, the positive electrode powder treatment process in waste lithium batteries is mainly based on wet recovery technology. In the wet process, in order to obtain valuable elements such as nickel, cobalt and lithium in the positive...

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Problems solved by technology

But at the same time, subsequent processes such as separation, impurity removal, and purification need to adjust the pH of the solution. Therefore, excessive sulfuric acid will consume a large amount of sodium hydroxide, and will also introduce a large amount of sodium sulfate into the system at the same time, resulting in a reduction in product purity. It has formed a contradiction with the purpose of battery recycling, and none of the existing domestic technologies can solve this problem

At the same time, in the existing wet recovery technology, the leaching process is intermittent leaching. This process has more transfer storage equipment and occupies a certain number of operators, which limits the utilization rate of equipment to a certain extent and reduces production. efficiency

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