Method for preparing battery-grade iron phosphate by taking chlorate as medium
A technology of ferric phosphate and chloride, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor performance of ferric phosphate and low ion utilization rate, and achieve reduced effective utilization, simple process and high purity high effect
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Embodiment 1
[0043] like figure 1 and figure 2 Shown, a kind of method for preparing battery-grade iron phosphate with chloride salt as medium, comprises the following steps:
[0044] S1: Take 2 mol of ferrous sulfate crystals, a by-product of titanium dioxide, add 1 L of water to dissolve, heat the reaction in a water bath at 70°C, add sodium hydroxide solution and 0.04 mol of phosphoric acid solution, adjust the pH to 2.0, react for 0.5h and then filter Washing obtains ferrous sulfate purification liquid;
[0045] S2: Add 3.0 mol of hydrogen peroxide to the ferrous sulfate purification solution for oxidation, then add a mixed solution of 2.4 mol of phosphoric acid and 2.5 mol of sodium chloride, and set the volume to 1.8 L to obtain a pre-reaction solution;
[0046] S3: Heat the pre-reaction solution at 150°C, during which deionized water is fed at a constant speed to maintain the iron ion concentration at 3.5mol / L, and the reaction time is 5h. After the heating is completed, deionize...
Embodiment 2
[0049] A method for preparing battery-grade iron phosphate using chloride as a medium, comprising the following steps:
[0050] S1: Take 2 mol of ferrous sulfate crystals, a by-product of titanium dioxide, add 1.33 L of water to dissolve, heat the reaction in a water bath at 85°C, add sodium hydroxide solution and 0.05 mol of phosphoric acid solution, adjust the pH to 1.8, and react for 1.0 h Filter and wash to obtain ferrous sulfate purification solution;
[0051] S2: Add 2.5 mol of hydrogen peroxide to the ferrous sulfate purification solution for oxidation, then add a mixed solution of 2.0 mol of phosphoric acid and 2.1 mol of potassium chloride, and set the volume to 1.1 L to obtain a pre-reaction solution;
[0052] S3: Heat the pre-reaction solution at 100°C, during which deionized water is fed at a constant speed to maintain the iron ion concentration at 4.0mol / L, and the reaction time is 4h. After the heating is completed, deionized water is fed at a constant speed, and...
Embodiment 3
[0055] A method for preparing battery-grade iron phosphate using chloride as a medium, comprising the following steps:
[0056] S1: Take 2 mol of ferrous sulfate crystals, a by-product of titanium dioxide, add 1.20 L of water to dissolve, heat the reaction in a water bath at 60°C, add sodium hydroxide solution and 0.043 mol of phosphoric acid solution, adjust the pH to 1.9, and react for 1.0 h Filter and wash to obtain ferrous sulfate purification solution;
[0057] S2: Add 2.7 mol of hydrogen peroxide to the ferrous sulfate purification solution for oxidation, then add a mixed solution of 2.2 mol of phosphoric acid and 2.2 mol of lithium chloride, and set the volume to 1.5 L to obtain a pre-reaction solution;
[0058] S3: Heat the pre-reaction solution at 140°C, during which deionized water is fed at a constant speed to maintain the iron ion concentration at 2.5mol / L, and the reaction time is 6h. After the heating is completed, deionized water is fed at a constant speed, and ...
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