Method for preparing battery-grade lithium carbonate and battery-grade iron phosphate by using lithium iron phosphate battery positive and negative electrode waste powder
A lithium iron phosphate battery, lithium iron phosphate technology, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, phosphorus compounds, etc., can solve the problem of low lithium ion concentration, low lithium recovery rate, Alkali metal high problems, to achieve the effect of strong operability, solving environmental problems and improving economic benefits
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Embodiment 1
[0032] A method of preparing a cell grade carbonate and battery-grade phosphate using a phosphate-based lithium phosphate battery, and a process flow thereof, such as figure 1 As shown, including the following steps:
[0033] (1) 1 kg of lithium iron phosphate positive and negative waste powder (main components and content: Li 3.5%, Fe 27.1%, P15.1%) and water mixed were made into a slurry of 1: 3, and the material The slurry was heated to 80 ° C, and the concentration of 98% sulfuric acid, 450 g sulfate and 10 g of calcium chloride were slowly added. The pH of the control reaction system was 1.8-1.9. After 4 hours, filtration was carried out after completion of the reaction. Get a lithium-containing solution and phosphate slag;
[0034] (2) The lithium-containing solution after the step (1) is added to the depth, obtain a high concentration of lithium solution, and prepare a cell-grade carbonate product with a high concentration of lithium solution.
[0035] (3) The phosphotum an...
Embodiment 2
[0047] A method of preparing a cell grade carbonate and a battery-level phosphate using a phosphate-based lithium phosphate battery is preparing a cell-based carbonate and a battery-level phosphate, including the following steps:
[0048] (1) 1 kg of lithium iron phosphate positive and negative powder (main components and content: Li4.0%, Fe28.1%, P16.5%) and water mixed were mixed into slurry of 1: 4, Heat the slurry to 95 ° C, slowly added sulfuric acid with 98% by stirring while stirring, 50m 3 Pure oxygen and 25.2 g of magnesium sulfate, the pH of the control reaction system was 1.6-1.9, and the reaction was 8 hours, and the reaction was filtered after completion, and the lithium-containing solution and phosphot residue were obtained.
[0049] (2) The lithium-containing solution after the step (1) is added to the depth, obtain a high concentration of lithium solution, and prepare a cell-grade carbonate product with a high concentration of lithium solution.
[0050] (3) Mix the...
Embodiment 3
[0062] A method of preparing a cell grade carbonate and a battery-level phosphate using a phosphate-based lithium phosphate battery is preparing a cell-based carbonate and a battery-level phosphate, including the following steps:
[0063] (1) 1 kg of lithium iron phosphate positive and negative waste powder (main components and content: Li 4.1%, Fe 27.5%, P16.3%) and water mixed were made into a slurry of 1: 2.5, and the material The slurry was heated to 95 ° C, and the concentration of 98% sulfate was slowly added while stirring, 500 g of sodium sulfate, the pH of the control reaction system was 1.8-1.95, and the reaction was 3 hours, and the reaction was filtered, and the lithium-containing solution was obtained. Phosphorus iron slag;
[0064] (2) The lithium-containing solution after step (1) is induced, resulting in a high concentration of lithium solution, preparing a cell-grade carbonate product in a high concentration of lithium solution;
[0065] (3) The phosphotum and wat...
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