公开(公告)号：US20190352740A1

公开(公告)日：2019-11-21

申请号：US16529729

申请日：2019-08-01

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zhongwei ZHAO ,  Yongli LI ,  Xuheng LIU ,  Wanhai XIAO ,  Xingyu CHEN ,  Jiangtao LI

IPC: C22B3/08 ,  C22B3/38 ,  C22B15/00 ,  C22B3/00

Abstract: The present invention relates to the field of ore smelting technology, and particularly provides a method and system for comprehensive recovery and utilization of copper-nickel sulfide ore. Under normal pressure, the method can be used to directly leach copper-nickel sulfide ore concentrate or low-grade nickel matte obtained by matte smelting of copper-nickel sulfide ore. In the leaching process, the leaching rate of nickel, cobalt and iron is up to 99% or more, and copper is hardly leached, whereby the deep separation of copper from elements such as nickel and cobalt is directly realized, and the huge system for copper-nickel separation in the conventional process is omitted. Moreover, noble metals are not leached, and almost all of them remain in the leaching slag with copper, so the destiny is simple.

公开(公告)号：US20190185341A1

公开(公告)日：2019-06-20

申请号：US16327334

申请日：2017-08-03

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zhongwei ZHAO ,  Yongli LI

IPC: C01G41/00

CPC classification number: C01G41/006 ,  B01J27/199 ,  C01B25/16 ,  C01G41/00 ,  C01G41/003 ,  C30B7/02 ,  C30B29/10

Abstract: A preparation method of phosphotungstic acid includes mixing a mixed solution containing tungsten, phosphorus and an inorganic acid with an organic-alcohol-containing oil phase for extraction, stripping the obtained supported organic phase and distilled water according to an oil phase:aqueous phase volume ratio of 3:1 to 10:1 to obtain a stripping solution; and carrying out thermal evaporation crystallization or spray drying on the stripping solution to obtain a phosphotungstic acid crystal, wherein the organic alcohol is a C7-C20 alcohol. The inventors have found out that the addition of an inorganic acid to a solution of phosphorus or tungsten and the use of an organic alcohol as an extractant can achieve simultaneous and efficient extraction of phosphotungstic acid. It has also been found that the organic-alcohol-containing oil phase has excellent selectivity for phosphotungstic acid molecules in the mixed solution.