公开(公告)号：US20230158424A1

公开(公告)日：2023-05-25

申请号：US17992949

申请日：2022-11-23

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Jiangtao LI ,  Zhongwei ZHAO ,  Zhichao LI ,  Xingyu CHEN ,  Xuheng LIU ,  Lihua HE ,  Fenglong SUN ,  Yongjin LUO ,  Muye CUI

IPC: B01D9/00 ,  C01G39/00

CPC classification number: B01D9/0063 ,  B01D9/005 ,  C01G39/006 ,  B01D2009/0086 ,  C01P2002/72 ,  C01P2004/03

Abstract: A method for crystallization of β-ammonium tetramolybdate includes: performing a stepwise pH-adjusting treatment of an ammonium molybdate solution via zoning to obtain the β-ammonium tetramolybdate. When feeding the ammonium molybdate solution into a reaction system from a first zone and then into second to sixth zones successively, pH1 of a resultant solution in the first zone is 7.0-6.0; pH2 of a resultant solution in the second zone is less than 6 and greater than or equal to 4; pH3 of a resultant solution in the third zone is less than 4 and greater than or equal to 2.5; pH4 of a crystallized slurry in the fourth zone is less than 2.5 and greater than or equal to 1; pH5 of a crystallized slurry in the fifth zone is 2.5-4.0; and pH6 of a crystallized slurry in the sixth zone is less than 2.5 and greater than or equal to 2.0.

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：US20130195737A1

公开(公告)日：2013-08-01

申请号：US13794844

申请日：2013-03-12

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zhongwei ZHAO ,  Jiangtao LI

IPC: C22B34/36

CPC classification number: C22B34/36 ,  C22B3/06 ,  C22B3/08 ,  Y02P10/234

Abstract: A method for extracting tungsten from scheelite by: 1) adding a mixed acid including H2SO4 and H3PO4 to a decomposition reactor; 2) heating the mixed acid to a temperature of 70-100° C.; adding scheelite while controlling the liquid-solid ratio at about 3:1-8:1 L/kg; allowing the components in the decomposition reactor to react for 1-6 h, and filtering to obtain a filtrate; 3) supplementing the filtrate with sulfuric acid consumed in the reaction; 4) crystallizing the filtrate to obtain phosphotungstic acid crystals and mother liquor; 5) dissolving the phosphotungstic acid crystals in water to obtain phosphotungstic acid solution; 6) transforming the phosphotungstic acid solution into an ammonium tungstate solution for the purpose of preparing ammonium paratungstate; and 7) supplementing the mother liquor with phosphoric acid and water to an initial level and reusing the mother liquor for ore leaching.

Abstract translation: 一种通过以下方式从白钨矿中提取钨的方法：1）向分解反应器中加入包括H 2 SO 4和H 3 PO 4的混合酸; 2）将混合酸加热到70-100℃的温度; 在约3：1-8：1 L / kg的同时控制液固比，添加白钨矿; 使分解反应器中的组分反应1-6小时，过滤得到滤液; 3）用反应中消耗的硫酸补充滤液; 4）使滤液结晶，得到磷钨酸晶体和母液; 5）将磷钨酸晶体溶解在水中，得到磷钨酸溶液; 6）将磷钨酸溶液转化为钨酸铵溶液，以制备仲钨酸铵; 和7）将母液用磷酸和水补充至初始水平，并重新使用母液进行矿石浸出。