公开(公告)号：EP2791373A1

公开(公告)日：2014-10-22

申请号：EP12858007.3

申请日：2012-12-10

申请人： Process Research Ortech Inc.

发明人： LAKSHMANAN, Vaikuntam I. ,  SRIDHAR, Ramamritham ,  CHEN, Jonathan ,  HALIM, M.A. ,  DELAAT, Robert

IPC分类号： C22B3/10 ,  C22B3/22 ,  C22B3/26 ,  C22B23/00 ,  C22B61/00

CPC分类号： C21B3/00 ,  C22B3/0021 ,  C22B23/0423 ,  Y02P10/234

摘要： The invention provides a process for the leaching of a laterite ore, concentrate, tailings or waste rock for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore, followed by a liquid/solids separation step. The liquid obtained is subject to solvent extraction with a dialkyl ketone, to obtain a solution rich in iron and a raffinate. Separation of iron from cobalt and nickel is obtained.

公开(公告)号：EP2836617A1

公开(公告)日：2015-02-18

申请号：EP13775400.8

申请日：2013-04-08

申请人： Process Research Ortech Inc.

发明人： LAKSHMANAN, Vaikuntam I. ,  SRIDHAR, Ramamritham ,  HALIM, M. A.

IPC分类号： C22B3/10 ,  C22B3/24 ,  C22B3/30 ,  C22B3/44 ,  C22B11/00

CPC分类号： C22B11/04 ,  C22B3/10 ,  Y02P10/234

摘要： A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.

摘要翻译： 一种从含金矿石或浓缩物中提取金的方法，包括以下步骤：在大气压下在至少90℃的温度下用含盐酸和氯化镁的浸液浸出含金矿石或浓缩物。 和至少900mV的Eh。 在液/固分离步骤之后，使用肟进行有机溶剂萃取步骤，得到含有金的有机溶剂的溶液，用硫代硫酸钠汽提以回收金。 可以操作萃取以提取或不用铁提取金。 在该过程中使用的材料可以被再循环。 该过程避免与使用氰化物提取黄金相关的环境和其他危害。

公开(公告)号：EP2978865A1

公开(公告)日：2016-02-03

申请号：EP14774909.7

申请日：2014-03-20

申请人： Process Research Ortech Inc.

发明人： LAKSHMANAN, Vaikuntam I. ,  SRIDHAR, Ramamritham ,  HALIM, Md. Abdul ,  CHEN, Jonathan ,  DELAAT, Robert J.

IPC分类号： C22B3/30 ,  C22B3/10 ,  C22B3/28 ,  C22B23/00

CPC分类号： C22B23/0484 ,  C22B3/0017 ,  C22B23/0423 ,  Y02P10/234

摘要： The invention provides a process for the leaching of a laterite ore or concentrate for the recovery of value metals, at least one value metal being nickel. The laterite ore or concentrate is subjected to a leaching step in acidic mixed chloride solution to leach nickel from the laterite ore. Nickel is extracted with an oxime at a lower pH than other processes for extraction of nickel from solution, especially after separation of iron and cobalt values.