US 12,473,611 B2
Dynamic optimization method for acid-to-ore ratio in high-pressure leaching of laterite nickel ore
Satryo Soemantri Brodjonegoro, Dki Jakarta (ID); Kaihua Xu, Guangdong (CN); Yi Wang, Dki Jakarta (ID); Rizky Wanaldi, Dki Jakarta (ID); Tegar Mukti Aji, Dki Jakarta (ID); Evan Wahyu Kristiyanto, Dki Jakarta (ID); Andi Syaputra Hasibuan, Dki Jakarta (ID); and Piyan Rahmadi, Dki Jakarta (ID)
Assigned to GEM CO., LTD., Shenzhen (CN); and PT GEM INDONESIA NEW ENERGY MATERIALS, Jakarta Selatan (ID)
Appl. No. 18/870,455
Filed by PT ESG NEW ENERGY MATERIAL, Dki Jakarta (ID); PT QMB NEW ENERGY MATERIALS, Dki Jakarta (ID); GEM CO., LTD., Guangdong (CN); and PT GEM INDONESIA NEW ENERGY MATERIALS, Dki Jakarta (ID)
PCT Filed Jul. 27, 2023, PCT No. PCT/CN2023/109608
§ 371(c)(1), (2) Date Nov. 29, 2024,
PCT Pub. No. WO2025/020176, PCT Pub. Date Jan. 30, 2025.
Prior Publication US 2025/0171876 A1, May 29, 2025
Int. Cl. C22B 3/00 (2006.01); C22B 3/08 (2006.01); G05D 7/00 (2006.01)
CPC C22B 23/043 (2013.01) [C22B 3/08 (2013.01); G05D 7/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A dynamic optimization method for acid-to-ore ratio in high pressure leaching of laterite nickel ore, comprising:
obtaining a feed ore composition, a pulp concentration, a pulp flow rate, a leaching temperature and a pulp duration time in an autoclave, and setting a target leaching rate of nickel;
setting a flow rate of sulfuric acid;
according to the set flow rate of sulfuric acid, the feed ore composition, the pulp concentration, the pulp flow rate, and the leaching temperature, obtaining a relationship between a hydrogen ion concentration in a solution and a reaction time;
according to the relationship between the hydrogen ion concentration in the solution and the reaction time, the feed ore composition, the pulp concentration, the pulp flow rate, and the pulp duration time in the autoclave, obtaining a theoretical leaching rate of nickel when a leaching time reaches the pulp duration time in the autoclave at a current flow rate of sulfuric acid;
comparing the theoretical leaching rate of nickel with the target leaching rate of nickel; if the theoretical leaching rate of nickel is not equal to the target leaching rate of nickel, adjusting the set flow rate of the sulfuric acid, repeatedly performing the foregoing steps until the theoretical leaching rate of nickel is equal to the target leaching rate of nickel, outputting the current flow rate of sulfuric acid as an optimal flow rate of sulfuric acid, and calculating a corresponding optimal acid-to-ore ratio; and
according to the optimal acid-to-ore ratio, adjusting an opening degree of a sulfuric acid flow regulating valve of the autoclave to ensure that an actual acid leaching process is performed under an optimal acid-to-ore ratio condition during an entire duration of the acid leaching process.