Provided is a method for producing nickel powder from a nickel ammine sulfate complex solution, comprising treatment steps of: (1) a seed crystal production step of producing nickel powder having an average particle size of 0.1 to 5 m; (2) a seed crystal addition step of adding the nickel powder obtained in the step (1) as seed crystals to form a mixed slurry; (3) a reduction step of forming a reduced slurry containing nickel powder formed by precipitation of a nickel component in the mixed slurry on the seed crystals; and (4) a growth step of performing solid-liquid separation to separate and recover the nickel powder as a solid phase component and then blowing hydrogen gas into a solution prepared by adding the nickel ammine sulfate complex solution to the recovered nickel powder to grow the nickel powder to form high purity nickel powder.

Disclosed is a treatment system for the slag phase after removing iron-aluminum-chromium from leaching solution of laterite nickel ore, comprising a filtering module, a refining module, a feeding module, and a measurement module. The filtering module comprises a material suction component and a filtering assembly. The filtering assembly is connected to the outlet of the material suction component and features a filter residue outlet and a filtrate outlet. The refining module is connected to the filter residue outlet. The feeding module consists of a material pipe and a material guiding drive component. The material pipe has an inlet end connected to the outlet of the refining module. This setup enables the timely filtration of the generated slag phase, followed by refinement processing, and allows for the controlled metering of the returned filter residue. Consequently, it enhances the subsequent acid leaching and dissolution efficiency of the slag phase.

Disclosed is a combined heat exchange system of flash tank and preheater for laterite nickel ore leaching. The system comprises a high-pressure reactor, preheating towers, and flash tanks. The preheating tower is connected to the feed inlet of the high-pressure reactor. The flash tank is connected to the discharge outlet of the high-pressure reactor, and it is also connected to the preheating tower. Inside the flash tank, there is a pressure relief chamber and a buffering mechanism. The buffering mechanism comprises a buffering component and a connecting structure that are interconnected. In this disclosure, the buffering component of the pressure relief chamber is equipped with a central bulge and a buffering tank, materials falling from the pressure relief chamber can sequentially pass over the central bulge and slide from one end of the buffering tank to the other, then slide upwards out of the tank, achieving a buffering effect.

A process and system for recovering manganese from a high-pressure leaching system of laterite nickel ore, including the following steps: S1. adding limestone to the high-pressure leaching solution of the laterite nickel ore for pre-neutralization to obtain first-stage carbon dioxide and a neutralization solution, adding limestone for precipitation of iron and aluminum to obtain second-stage carbon dioxide and a slurry, and adding liquid alkali to the slurry for precipitation of nickel-cobalt-manganese to obtain nickel-cobalt-manganese hydroxide and a nickel-cobalt-manganese precipitated lean solution; S2. collecting first-stage carbon dioxide and second-stage carbon dioxide and passing same into a nickel-cobalt-manganese precipitated lean solution, adjusting the pH value of the nickel-cobalt-manganese precipitated lean solution to 5-6.5 by liquid alkali, and then performing a precipitation reaction to obtain a crude manganese carbonate; S3. dissolving the crude manganese carbonate with sulfuric acid to obtain a dissolution liquid and third-stage carbon dioxide, then removing calcium and magnesium from the dissolution liquid to obtain a manganese sulfate solution and then evaporating and crystallizing to obtain manganese sulfate crystals; recycling the third-stage carbon dioxide and introducing same into a nickel-cobalt-manganese precipitated lean solution; the recovery rate and utilization rate of manganese is high, and the carbon emission from laterite nickel ore leaching process is reduced.

Provided herein is a nickel recovering method, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process; and (F) a reduction process for performing a hydrogen reduction method on the purified solution produced by the purification process to recover nickel from the purified solution.

The present disclosure relates to methods and materials for leaching and recovering metals from oxide ores.

A process and system for recovering manganese from a high-pressure leaching system of laterite nickel ore, including the following steps: S1. adding limestone to the high-pressure leaching solution of the laterite nickel ore for pre-neutralization to obtain first-stage carbon dioxide and a neutralization solution, adding limestone for precipitation of iron and aluminum to obtain second-stage carbon dioxide and a slurry, and adding liquid alkali to the slurry for precipitation of nickel-cobalt-manganese to obtain nickel-cobalt-manganese hydroxide and a nickel-cobalt-manganese precipitated lean solution; S2. collecting first-stage carbon dioxide and second-stage carbon dioxide and passing same into a nickel-cobalt-manganese precipitated lean solution, adjusting the pH value of the nickel-cobalt-manganese precipitated lean solution to 5-6.5 by liquid alkali, and then performing a precipitation reaction to obtain a crude manganese carbonate; S3. dissolving the crude manganese carbonate with sulfuric acid to obtain a dissolution liquid and third-stage carbon dioxide, then removing calcium and magnesium from the dissolution liquid to obtain a manganese sulfate solution and then evaporating and crystallizing to obtain manganese sulfate crystals; recycling the third-stage carbon dioxide and introducing same into a nickel-cobalt-manganese precipitated lean solution; the recovery rate and utilization rate of manganese is high, and the carbon emission from laterite nickel ore leaching process is reduced.

Disclosed is a treatment system for the slag phase after removing iron-aluminum-chromium from leaching solution of laterite nickel ore, comprising a filtering module, a refining module, a feeding module, and a measurement module. The filtering module comprises a material suction component and a filtering assembly. The filtering assembly is connected to the outlet of the material suction component and features a filter residue outlet and a filtrate outlet. The refining module is connected to the filter residue outlet. The feeding module consists of a material pipe and a material guiding drive component. The material pipe has an inlet end connected to the outlet of the refining module. This setup enables the timely filtration of the generated slag phase, followed by refinement processing, and allows for the controlled metering of the returned filter residue. Consequently, it enhances the subsequent acid leaching and dissolution efficiency of the slag phase.

Disclosed is a combined heat exchange system of flash tank and preheater for laterite nickel ore leaching. The system comprises a high-pressure reactor, preheating towers, and flash tanks. The preheating tower is connected to the feed inlet of the high-pressure reactor. The flash tank is connected to the discharge outlet of the high-pressure reactor, and it is also connected to the preheating tower. Inside the flash tank, there is a pressure relief chamber and a buffering mechanism. The buffering mechanism comprises a buffering component and a connecting structure that are interconnected. In this disclosure, the buffering component of the pressure relief chamber is equipped with a central bulge and a buffering tank, materials falling from the pressure relief chamber can sequentially pass over the central bulge and slide from one end of the buffering tank to the other, then slide upwards out of the tank, achieving a buffering effect.

A method for producing a rich solvent containing a dissolved compound at an intended concentration level includes filling one of two storage containers with lean solvent and fluidly connecting said storage container to a dissolution reactor containing the compound to be dissolved. The method further includes the following steps: i) enriching the lean solvent in the storage container being fluidly connected to the dissolution reactor by circulating the lean solvent between the dissolution reactor and said storage container, ii) emptying, if present, rich solvent from one of the two storage containers not fluidly connected to the dissolution reactor to a product handling facility, and then filling said storage container with lean solvent, and iii) when the solvent in step i) has reached the predetermined concentration level of dissolved compound, fluidly disconnecting said storage container in step i) from the dissolution reactor and fluidly connecting the dissolution reactor to the said storage container in step ii) being filled with lean solvent, and then go to step i).