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公开(公告)号:US3919395A
公开(公告)日:1975-11-11
申请号:US19051171
申请日:1971-10-19
发明人: HAUGE DOUGLAS O
CPC分类号: C01B25/324 , B01D11/02 , C01B25/22
摘要: An extraction process for recovery of phosphorus compounds from both low and high grade phosphate ores utilizes a room temperature extraction with dilute mineral acids whose calcium salts are water soluble. Preferably the ore is coarsely ground. Dissolved impurities are removed from the dilute phosphate solution by a first neutralization step, whereafter further neutralization precipitates high purity calcium hydrogen phosphate. The latter may be converted to high purity phosphoric acid by treatment with sulfuric acid. Either lime or ammonia may be used advantageously as a neutralizing agent.
摘要翻译: 从低级和高级磷酸盐矿中回收磷化合物的提取方法利用钙盐是水溶性稀释的无机酸进行室温萃取。 优选地,矿石是粗磨的。 通过第一中和步骤从稀磷酸盐溶液中除去溶解的杂质,然后进一步中和沉淀出高纯度的磷酸氢钙。 后者可以通过用硫酸处理转化为高纯度磷酸。 可以有利地使用石灰或氨作为中和剂。