Method for purifying battery-grade lithium carbonate from crude lithium carbonate
A lithium carbonate, battery-grade technology, applied in the field of crude lithium carbonate purification battery-grade lithium carbonate and crude lithium carbonate purification, to achieve the effects of low energy consumption, slowing supply pressure, and increasing production capacity
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Embodiment 1
[0022] A method for purifying battery-grade lithium carbonate by crude lithium carbonate provided by the invention, the specific process can be referred to figure 1 , including the following steps:
[0023] 1) Add 7.4g of crude lithium carbonate to 50ml of dilute sulfuric acid (the volume ratio of concentrated sulfuric acid to water is 1:3) to dissolve, adjust the pH of the dissolved solution to 12, add 5ml of 30% hydrogen peroxide for oxidation, and filter through 300 mesh net to collect filtrate and filter cake respectively,
[0024] 2) The filter residue is washed with deionized water, and the washed washing liquid is recovered and added to step 2) for reuse; 10.6g of sodium carbonate is added to the filtrate, and fully stirred for 2h to obtain lithium carbonate;
[0025] 3) Mix the lithium carbonate obtained above with water at a mass ratio of 1:7, age at a temperature of 40°C for 1 hour; pass through a 300-mesh filter, collect the filtrate and filter cake respectively, w...
Embodiment 2
[0029] A method for purifying battery-grade lithium carbonate by crude lithium carbonate provided by the invention, the specific process can be referred to figure 1 , including the following steps:
[0030] 1) Add 7.0 g of crude lithium carbonate to 50 ml of dilute sulfuric acid to dissolve, adjust the pH of the dissolved solution to 13, add 5 ml of 30% hydrogen peroxide for oxidation, pass through a 300-mesh filter, and collect the filtrate and filter cake respectively.
[0031] 2) The filter residue is washed with deionized water, and the washed washing liquid is recovered and added to step 2) for reuse; 10.6 g of sodium carbonate is added to the filtrate, and fully stirred for 3 hours to obtain lithium carbonate;
[0032] 3) Mix the lithium carbonate obtained above with water at a mass ratio of 1:5, age at 60°C for 2 hours; pass through a 300-mesh filter, collect the filtrate and filter cake, wash the filter cake with deionized water, and The washed filter cake is dried at...
Embodiment 3
[0036] A method for purifying battery-grade lithium carbonate by crude lithium carbonate provided by the invention, the specific process can be referred to figure 1 , including the following steps:
[0037] 1) Dissolve 8.0 g of crude lithium carbonate in 50 ml of dilute sulfuric acid, adjust the pH of the dissolved solution to 13, add 5 ml of 30% hydrogen peroxide for oxidation, pass through a 300-mesh filter, and collect the filtrate and filter cake respectively.
[0038] 2) The filter residue is washed with deionized water, and the washed washing liquid is recovered and added to step 2) for reuse; 10.6g of sodium carbonate is added to the filtrate, and fully stirred for 2h to obtain lithium carbonate;
[0039] 3) Mix the lithium carbonate obtained above with water at a mass ratio of 1:6, age at a temperature of 50°C for 2 hours; pass through a 300-mesh filter, collect the filtrate and filter cake respectively, wash the filter cake with deionized water, and The washed filter...
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