硫酸锌溶液脱除钙镁试验及生产应用

某硫酸锌生产厂，由于原料氧化锌矿中钙镁含量较高，用硫酸浸出后的硫酸锌溶液中钙镁含量也较高，导致生产的硫酸锌产品钙镁含量偏高，主含量偏低，影响了硫酸锌产品质量。对氢氟酸沉淀法脱除硫酸锌溶液中的钙镁离子进行了试验研究及生产应用。用氢氟酸作为沉淀剂，在较低温度和较高pH条件下可有效脱除硫酸锌溶液中的钙镁离子，并能控制氟在溶液中的累积，使制得的硫酸锌产品质量得以提高。

Experiment and production application of removal of Ca2+ and Mg2+ from zinc sulphate solution

Calcium and magnesium contents of one zinc sulphate plant′s zinc sulphate product were on the high side and its product′s main content was also very low，because zinc oxide ore，the raw material had high contents of calcium and magnesium，resulting in high content of calcium and magnesium in zinc sulphate solution during the sulfuric acid leaching process.Therefore，the product quality was affected.The removal of Ca²⁺ and Mg²⁺ from aqueus zinc sulphate solution with hydrofluoric acid precipitation process was experimentally studied and the production application was also made.Using hydrofluoric acid as precipitant at low temperature and high pH conditions，Ca²⁺ and Mg²⁺ could be removed effectively from the solution.Moreover，the accumulation of fluorine ions in the solution could also be controlled.Thus the product′s quality could be improved.