Method for selective leaching of valuable metals in laterite nickel ore by chloride salt
A technology for laterite nickel ore and valuable metals, applied in the fields of manganese, nickel, and cobalt, which can solve the problems of high content of iron and other impurity metals, poor economic applicability, and increased workload, so as to reduce iron leaching and adapt raw materials Strong, less environmental impact
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Embodiment 1
[0018] Put 20g of laterite nickel ore material with a particle size of 0.15mm into the hydrochloric acid solution of 2mol / L ammonium chloride (the concentration of hydrochloric acid is 2mol / L, the solid-liquid ratio of the pulp is 1:4), and 1.5L / h, the leaching temperature is 90°C, and after leaching for 60 minutes, carry out solid-liquid separation by suction filtration while hot, and then measure the leaching rate of Ni, Co, Mn, and Fe in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade lateritic nickel ore reaches 87%, the leaching rate of cobalt reaches 75%, and the leaching rate of manganese reaches 90%. The leaching rate of iron is only 19%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.
Embodiment 2
[0020] Put 20g of laterite nickel ore material with a particle size of 0.074mm into the hydrochloric acid solution of 1mol / L ammonium chloride (the concentration of hydrochloric acid is 1mol / L, and the solid-liquid ratio of the pulp is 1:5), and oxygen 1L / h is introduced from the bottom , the leaching temperature is 100°C, the leaching time is 90min, suction filtration while hot, and then measure the leaching rate of Ni, Co, Mn, Fe in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade laterite nickel ore reaches 83%, the leaching rate of cobalt reaches 72%, and the leaching rate of manganese reaches 89%. The leaching rate of iron is only 17%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.
Embodiment 3
[0022] Put 20g of laterite nickel ore material with a particle size of 0.15mm into a hydrochloric acid solution of 4mol / L ammonium chloride (the concentration of hydrochloric acid is 4mol / L, and the solid-liquid ratio of the pulp is 1:6), and 0.5L / L of ozone is introduced from the bottom. h, the leaching temperature is 90°C, and after leaching for 120 minutes, it is suction filtered while it is hot, and the solid-liquid separation is carried out, and the obtained solution is the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade lateritic nickel ore reaches 93%, the leaching rate of cobalt reaches 83%, and the leaching rate of manganese reaches 91%. The leaching rate of iron is only 11%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.
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