Comprehensive resource recovery method for laterite-nickel ore

A technology of lateritic nickel ore and recovery method, which is applied in the field of metallurgy, can solve the problems of large amount of waste residue and wastewater, high carbon emission, and long construction period, etc., to reduce equipment investment costs, low-carbon recycling, and reduce carbon emissions Effect

Active Publication Date: 2022-05-13
CENT SOUTH UNIV
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Problems solved by technology

The sulfuration roasting-water immersion method is still in the research stage, and large-scale industrial application still needs to solve the problems of low nickel leaching rate (Ni leaching rate is only about 85%), sulfur-containing waste gas treatment, and high carbon emissions.
The biggest disadvantage of the reduction roasting-ammonia leaching method is that the recovery rate of nickel and cobalt is low, the recovery rate of the whole process is only 75-80%, and the recovery rate of cobalt is about 40-50%
High-pressure acid leaching is currently the mainstream process for treating limonite-type lateritic nickel ore, and the recovery rate of nickel and cobalt can reach more than 90%. Problems such as large amount of waste residue and wastewater

Method used

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  • Comprehensive resource recovery method for laterite-nickel ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The composition of laterite nickel ore to be treated in this embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc 0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.% and Cr1.23wt.%.

[0045] The resource comprehensive recovery method of the laterite nickel ore of the present embodiment may further comprise the steps:

[0046] (1) Mix laterite nickel ore and concentrated sulfuric acid uniformly at a mass ratio of 5:1, and then heat them in a tubular atmosphere furnace to 250°C for heat treatment for 1 hour to obtain modified laterite nickel ore.

[0047] (2) Mix water and modified laterite nickel ore uniformly at a liquid-solid ratio (ratio in mL / g) of 10:1, and then transfer to a high-pressure reactor for hydrolysis reaction. The hydrolysis temperature is 200°C. The time is 1h, and the laterite nickel ore leaching solution and leaching slag are obtained. During this process, the leaching rates of Ni, Co, Mn, Sc, Fe, Mg, Al and Cr are 96.36%, 76.06%, 82.18%, 87.14%, 5...

Embodiment 2

[0052] The composition of laterite nickel ore to be treated in this embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc 0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.% and Cr1.23wt.%.

[0053] The resource comprehensive recovery method of the laterite nickel ore of the present embodiment, its process flow chart is as follows figure 1 shown, including the following steps:

[0054] (1) Mix the laterite nickel ore and ammonium sulfate uniformly at a mass ratio of 1:1, and then heat them in a tubular atmosphere furnace to 350°C for heat treatment and modification for 3 hours to obtain modified laterite nickel ore. The heat treatment modification process The ammonia produced in the process is absorbed with 0.5mol / L dilute sulfuric acid, and the ammonium sulfate solution obtained evaporates, concentrates, and crystallizes to prepare ammonium sulfate, and returns to the mixing process of step (1) for recycling.

[0055] (2) Mix water and modified laterite nickel ore uniforml...

Embodiment 3

[0060] The composition of laterite nickel ore to be treated in this embodiment is: Ni 0.75wt.%, Co 0.061wt.%, Mn0.57wt.%, Sc 0.0055wt.%, Fe 47.8wt.%, Mg 0.43wt.%, Al 3.98wt.% and Cr1.23wt.%.

[0061] The resource comprehensive recovery method of the laterite nickel ore of the present embodiment, its process flow chart is as follows figure 1 shown, including the following steps:

[0062] (1) Mix the laterite nickel ore and ammonium bisulfate uniformly at a mass ratio of 1:1, and then heat them in a tubular atmosphere furnace to 350°C for heat treatment and modification for 3 hours to obtain modified laterite nickel ore. The ammonia produced in the process is absorbed with 0.5mol / L dilute sulfuric acid to obtain ammonium sulfate solution, evaporated, concentrated, and crystallized to prepare ammonium sulfate, and return to the mixing process of step (1).

[0063] (2) Mix water and modified laterite nickel ore uniformly at a liquid-solid ratio (ratio in mL / g) of 10:1, and then ...

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Abstract

The invention discloses a comprehensive resource recovery method for laterite-nickel ore. The method comprises the following steps: mixing the laterite-nickel ore with a modifier, and carrying out heat treatment to obtain modified laterite-nickel ore; the modifier is at least one of concentrated sulfuric acid, ammonium sulfate, ammonium bisulfate and ammonium chloride; mixing the modified laterite-nickel ore with water, and then transferring the mixture into a high-pressure reaction kettle for hydrolysis to obtain laterite-nickel ore leaching liquid and leaching residues; the method comprises the following steps: adding alkali into a laterite-nickel ore leaching solution to adjust the pH value of the leaching solution to 7.0-8.5, and separating to obtain scandium-rich nickel cobalt hydroxide and a neutralized solution; and the obtained leaching residues are subjected to reduction roasting and magnetic separation, and iron ore concentrate is obtained. According to the method, concentrated sulfuric acid, ammonium sulfate, ammonium bisulfate or ammonium chloride is adopted as a modifier, and metal in the laterite-nickel ore is converted into corresponding sulfate through low-temperature roasting; and then water is adopted as a leaching agent, valuable metals such as nickel, cobalt and scandium are selectively leached out through a water leaching / hydrolysis method, meanwhile, base metals such as iron, aluminum and chromium are removed, and then efficient extraction of the laterite-nickel ore under the mild condition is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a resource comprehensive recovery method of laterite nickel ore. Background technique [0002] Nickel and cobalt are important strategic metals that support national defense and military construction and national economic development. At present, my country's nickel and cobalt consumption exceeds 50% of the world, and it has long relied on imports. With the depletion of nickel sulfide ore, laterite nickel ore has become the main raw material for nickel and cobalt extraction and is being developed and utilized on a large scale. According to the content of magnesia and iron and the composition of mineral phase, laterite nickel ore can be divided into limonite type and humus type. Humus-type lateritic nickel ore has the characteristics of high magnesium and low iron, and the nickel content (Ni>1.5%) is relatively high. Usually, the rotary kiln pre-reduction-electric furnace smelting pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00B03C1/015C22B1/02C22B3/02C22B3/14
CPCC22B23/0407C22B1/02B03C1/015C22B3/02C22B3/14
Inventor 田庆华董波郭学益许志鹏王青骜
Owner CENT SOUTH UNIV
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