公开(公告)号：WO2014033687A1

公开(公告)日：2014-03-06

申请号：PCT/IB2013/058216

申请日：2013-09-02

Applicant: COUNCIL RESEARCH SCIENTIFIC INDUSTRIAL RESEARCH

Inventor： GHOSH, Pushpito, Kumar ,  MAITI, Pratyush ,  GANDHI, Maheshkumar, Ramniklal

IPC: C01D3/04 ,  C01C1/24 ,  C01D5/00

CPC classification number: C01D5/00 ,  C01C1/24 ,  C01D3/04 ,  Y02P20/125

Abstract: The present invention provides an integrated process for the recovery of sulphate of potash (SOP) and ammonium sulphate fertilizers from kainite mixed salt dispensing with magnesium hydroxide production. The process comprises, among other steps, producing calcium chloride from calcium carbonate through addition of hydrochloric acid; the calcium chloride being used for desulphatation of schoenite end liquor (SEL) obtained as liquid stream during decomposition of kainite mixed salt with water to obtain solid schoenite; using the resultant gypsum and carbon dioxide together with ammonia for the production of ammonium sulphate liquor and solid calcium carbonate, the latter being recycled in the process; producing camallite from desulphated SEL; decomposing the camallite to recover camallite decomposed product (CDP) which is further refined under ambient conditions to obtain pure potassium chloride (KC1) utilised in the preparation of SOP from the schoenite. Except for ammonium sulphate recovery in solid state, where required, all operations are carried out at ambient temperature.

Abstract translation: 本发明提供了一种用于回收来自用氢氧化镁生产的卡培矿混合盐分配的硫酸钾（SOP）和硫酸铵肥料的综合方法。 除了其他步骤之外，该方法通过加入盐酸从碳酸钙生产氯化钙; 氯化钙用于在与水分解高岭土混合盐中获得的作为液体流获得的白铁矿末端液（SEL）的硫酸盐，得到固体白铁矿; 使用所得石膏和二氧化碳与氨一起生产硫酸铵液体和固体碳酸钙，后者在该过程中循环使用; 从脱硫的SEL中生产阴极原矿; 分解凹凸形状以回收在环境条件下进一步精制的阳极氧化铝分解产物（CDP），以获得用于从白钨矿制备SOP的纯氯化钾（KCl）。 除固体状态下的硫酸铵回收外，如果需要，所有操作均在环境温度下进行。