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以磷矿,氯化钾和硫酸为原料直接法制取磷酸二氢钾的加工过程中,钾是一个重要控制项目。采用火焰光度法进行钾的测定,既经济又快速简便。但是,由于加工过程中的中间溶液中大量磷的存在,严重影响钾的测定结果。显然,如果以化学分离法除去磷,不仅手续繁琐,且易导致钾的损失;采用模拟试液组成的校正曲线法,又因磷含量不一而难以测得正确的结果。从考虑操作方便出发,我们试图以通常所熟知的磷酸根对钙的抑制效应为依据,在试液中加入一定量的钙盐溶液,使生成磷酸钙来抑制磷对钾的干扰。通过试验表
With phosphate rock, potassium chloride and sulfuric acid as the raw material direct preparation of potassium dihydrogen phosphate process, potassium is an important control project. The determination of potassium by flame photometry is economical and fast. However, due to the presence of a large amount of phosphorus in the intermediate solution during processing, the determination result of potassium is seriously affected. Obviously, if chemical separation is used to remove phosphorus, not only the procedure is cumbersome, but also the potassium loss easily. Using the calibration curve method of simulated test solution, it is difficult to measure the correct result due to the different phosphorus content. In view of the convenience of operation, we tried to use the commonly known phosphate inhibition effect on calcium as a basis, adding a certain amount of calcium salt solution to the test solution to generate calcium phosphate to inhibit the interference of phosphorus to potassium. Through the test table