Method for recycling valuable metals in lithium battery through wet process
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A technology for recovering valuable metals and lithium, applied in battery recovery, recycling technology, recycling by waste collectors, etc., can solve the problems of high metal loss rate, time-consuming and laborious, long extraction process, etc.
Active Publication Date: 2021-12-17
GUANGDONG BRUNP RECYCLING TECH +2
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In the impurity removal process, multi-stage extraction is required for the separation of some metal ions. The extraction process is long, the metal loss rate is high, and it is time-consuming and laborious.
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Embodiment 1
[0032] A method of wet recovery of valuable metals in lithium batteries, with reference to figure 1 , the specific process is:
[0033] The contents of each metal in waste battery powder are: nickel 16.76%, cobalt 10.33%, manganese 7.52%, lithium 4.01%, iron 1.13%, aluminum 1.28%, copper 1.63%. Valuable metals can be recovered through the following steps:
[0034] First, leaching 100g of waste lithium battery powder collected in a sulfuric acid solution with hydrogen sulfide gas, the solid-liquid ratio is controlled at 250g / L, the reaction temperature is 20°C, the pH is 3.0, and the pressure is 3MPa. After 7 hours of reaction , through solid-liquid separation, to obtain L first stage leaching residue and 400m first stage leachate, and process them respectively;
[0035] (1) One section of leaching solution produces lithium carbonate:
[0036] ① Add sodium hydroxide to the first-stage leaching solution to adjust the pH to 5.0-5.5, and separate solid-liquid to obtain manganese...
Embodiment 2
[0045] A method for wet recovery of valuable metals in lithium batteries, the specific process is:
[0046] The contents of each metal in waste battery powder are: nickel 16.76%, cobalt 10.33%, manganese 7.52%, lithium 4.01%, iron 1.13%, aluminum 1.28%, copper 1.63%. Valuable metals can be recovered through the following steps:
[0047] First, leaching 100g of waste lithium battery powder collected in a sulfuric acid solution with hydrogen sulfide gas, the solid-liquid ratio is controlled at 250g / L, the reaction temperature is 60°C, the pH is 3.0, and the pressure is 6MPa. After 7 hours of reaction , through solid-liquid separation, one section of leach residue and 400mL of one section of leachate were obtained, and they were treated separately;
[0048] (1) One section of leaching solution produces lithium carbonate:
[0049] ① Add sodium hydroxide to the first-stage leaching solution to adjust the pH to 5.0-5.5, and separate solid-liquid to obtain manganese-lithium filtrate...
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Abstract
The invention discloses a method for recycling valuable metals in a lithium battery through a wet process. According to the method, waste lithium battery powder is selectively leached under the condition that hydrogen sulfide gas is pressurized and introduced, so that Mn < 2 + >, Li < + > and Al < 3 + > metal ions enter a first-stage leaching solution, nickel, cobalt, copper and iron exist in first-stage leaching residues in the form of sulfides, only a small amount of sulfuric acid is consumed in the process, then the pH value of the first-stage leaching solution is adjusted to remove aluminum and manganese, in the process, metal separation is extremely thorough, a prepared product is relatively pure, first-stage leaching residues are subjected to negative pressure leaching in acid liquor, the sulfides of nickel, cobalt, iron and copper are dissolved in second-stage leaching solution, generated hydrogen sulfide gas can be recycled and pressurized to the first-stage leaching procedure, in the whole reaction process, only a very small amount of hydrogen sulfide is consumed, and copper and iron are removed by utilizing the properties that copper is easy to replace and iron is easy to hydrolyze, so that a relatively pure nickel-cobalt salt mixed solution is obtained and can be directly used for synthesizing a positive electrode material precursor.
Description
technical field [0001] The invention belongs to the technical field of lithium battery recovery, and in particular relates to a method for wet recovery of valuable metals in lithium batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones, mobile power supplies, and notebooks due to their high energy density, high voltage, good cycle performance, low self-discharge, and high charge-discharge efficiency. At the same time, with the continuous development of the new energy automobile industry, the market demand for lithium-ion batteries is also expanding. [0003] However, the service life of power batteries generally does not exceed 10 years, and they will face the problem of being scrapped after reaching the end of life. Waste lithium-ion batteries contain a large amount of harmful and valuable metals. If they are discarded at will, it will cause great harm to the natural environment. pollution and de...
Claims
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