Central South University

Xuheng Liu

Zhongwei Zhao

Jiangtao Li

Xingyu Chen

Yongli Li

Wanhai Xiao

Fenglong Sun

Lihua He

Zhichao Li

Muye Cui

Yongjin Luo

A method for crystallization of &#x3b2;-ammonium tetramolybdate includes: performing a stepwise pH-adjusting treatment of an ammonium molybdate solution via zoning to obtain the &#x3b2;-ammonium tetramolybdate. When feeding the ammonium molybdate solution into a reaction system from a first zone and then into second to sixth zones successively, pHof a resultant solution in the first zone is 7.0-6.0; pHof a resultant solution in the second zone is less than 6 and greater than or equal to 4; pHof a resultant solution in the third zone is less than 4 and greater than or equal to 2.5; pHof a crystallized slurry in the fourth zone is less than 2.5 and greater than or equal to 1; pHof a crystallized slurry in the fifth zone is 2.5-4.0; and pHof a crystallized slurry in the sixth zone is less than 2.5 and greater than or equal to 2.0.

Method for crystallization of &#x3b2;-ammonium tetramolybdate

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.

Method and system for comprehensive recovery and utilization of copper-nickel sulfide ore

A method for extracting and enriching lithium, including: (a) providing an electrodialysis device including an electrodialysis cell; (b) dividing the electrodialysis cell into a lithium salt chamber and a brine chamber using an anion exchange membrane; (c) filling the brine chamber with salt lake brine; (d) filling the lithium salt chamber with a Mgfree supporting electrolyte solution; (e) placing a conductive substrate coated with an ion sieve in the brine chamber to operate as a cathode; (f) placing a conductive substrate coated with a lithium-intercalated ion sieve in the lithium salt chamber to operate as an anode; and (g) carrying out an electrodialysis.

Method and device for extracting and enriching lithium

Growing community of inventors

Changsha, China

Xuheng Liu