US 11,952,289 B2
Method for preparing nickel sulfate from nickel-iron-copper alloy
Haijun Yu, Guangdong (CN); Yinghao Xie, Guangdong (CN); Aixia Li, Guangdong (CN); Xuemei Zhang, Guangdong (CN); and Changdong Li, Guangdong (CN)
Assigned to Guangdong Brunp Recycling Technology Co., Ltd., Guangdong (CN); Hunan Brunp Recycling Technology Co., Ltd., Hunan (CN); and Hunan Brunp Ev Recycling Co., Ltd., Hunan (CN)
Appl. No. 18/260,238
Filed by GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Guangdong (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Hunan (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Hunan (CN)
PCT Filed Jun. 6, 2022, PCT No. PCT/CN2022/097188
§ 371(c)(1), (2) Date Jun. 30, 2023,
PCT Pub. No. WO2023/284441, PCT Pub. Date Jan. 19, 2023.
Claims priority of application No. 202110799807.6 (CN), filed on Jul. 15, 2021.
Prior Publication US 2023/0399240 A1, Dec. 14, 2023
Int. Cl. C01G 53/10 (2006.01); C01G 53/00 (2006.01)
CPC C01G 53/10 (2013.01) [C01G 53/003 (2013.01); C01P 2006/80 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for preparing nickel sulfate from a nickel-iron-copper alloy, comprising the following steps:
S1: mixing a crushed nickel-iron-copper alloy, ammonia water, ammonium sulfate and a corrosion aid in a high-pressure oxygen environment and performing leaching; the corrosion aid is at least one of ammonium sulfide, persulfate, or ammonium thiosulfate; a pressure of the leaching is 2.5 MPa to 4.0 MPa, and a temperature of the leaching is 50° C. to 65° C.;
S2: performing a solid-liquid separation on a slurry obtained by the leaching in step S1 to obtain a first filtrate and a first residue, adding a precipitant to the first filtrate, then distilling ammonia, and then performing filtration to obtain a nickel-containing leaching solution, wherein the precipitant is at least one of thiosulfate, sodium sulfide, or ammonium sulfide, and wherein each of the first filtrate and the first residue comprises copper; and
S3: adding an extractant into the nickel-containing leaching solution to extract nickel, allowing the system to stand and then separating to obtain a nickel-containing extracted organic phase, and then adding sulfuric acid into the nickel-containing extracted organic phase to perform a back extraction of nickel to obtain a nickel sulfate solution.