公开(公告)号：WO2007054953A1

公开(公告)日：2007-05-18

申请号：PCT/IN2005/000441

申请日：2005-12-27

Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH ,  PAUL, Parimal ,  GHOSH, Pushpito Kumar ,  LANGALIA, Kaushik Jethalal ,  SUBRAMANIAN, Palani Sivagnana ,  ERINGATHODI, Suresh ,  PATRA, Subrata ,  AGNIHOTRI, Pragati

Inventor： PAUL, Parimal ,  GHOSH, Pushpito Kumar ,  LANGALIA, Kaushik Jethalal ,  SUBRAMANIAN, Palani Sivagnana ,  ERINGATHODI, Suresh ,  PATRA, Subrata ,  AGNIHOTRI, Pragati

IPC: C01D5/00 ,  C05D1/02

CPC classification number: C05D1/02 ,  C01D3/06 ,  C01D5/00 ,  Y02P20/125

Abstract: The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA) . Lime is treated with DPA in water for the production of highly soluble Ca (DPA) 2, which in turn treated with SEL to produce insoluble K(DPA) .K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA) 2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite.

Abstract translation: 本发明涉及一种从苦酒中回收钾盐（SOP）的硫酸盐的方法。 赤铁矿通过盐水的分级结晶获得。 将凯氏铁矿转化成同时去除氯化钠的白铁矿，滤液（SEL）用于生产氯化钾。 白铁矿与KCl水溶液反应以产生SOP，并将滤液（KEL）在赤铁矿中再循环至闪长岩转化步骤。 来自SEL的KCl的生产在二辛基胺（DPA）的辅助下进行。 石灰在水中用DPA处理，用于生产高度可溶的Ca（DPA）2，其又用SEL处理以产生不溶性K（DPA）.KC（DPA）用HCl处理以产生KCl和不溶性DPA，其可以 再循环用于生产Ca（DPA）2.用氯铂酸处理得到的KCl水溶液以制备SOP。 与SOP一起获得的KEL被再循环以产生白铁矿。