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Method for extracting nickel from laterite-nickel ore and mineralizing CO2 simultaneously

A laterite nickel ore, time technology, applied in nickel sulfate, process efficiency improvement, magnesium carbonate and other directions, can solve the problem of high energy consumption for mineralization, and achieve the effects of reducing environmental pollution, mild reaction conditions and saving production costs

Active Publication Date: 2021-06-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention targets CO 2 High energy consumption for mineralization, nickel extraction from laterite nickel ore, and treatment of titanium dioxide industrial solid waste, provide a method for extracting nickel from laterite nickel ore while mineralizing CO 2 Methods

Method used

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  • Method for extracting nickel from laterite-nickel ore and mineralizing CO2 simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Evenly mix the laterite nickel ore that is finely ground to below 150 μm with green vitriol and sodium sulfate, and control the mass ratio of laterite nickel ore and green vitriol to be 1:4; the content of sodium sulfate is 5% of the total material quality; the mixture Calcined at 650°C for 180min to obtain a solid product;

[0022] (2) The solid product obtained in step 1 is leached with water at 100° C., and the leached slurry is subjected to solid-liquid separation to obtain a filter residue (the main component is Fe 2 o 3 , SiO 2 ) and a leach solution containing magnesium sulfate and nickel sulfate;

[0023] (3) Send the leachate obtained in step 2 to a sedimentation tank and add sodium sulfide in an equimolar amount to nickel ions in the leachate at 20° C. for a precipitation reaction to obtain a nickel sulfide product and a precipitation mother liquor;

[0024] (4) Slowly add ammonia water to the precipitated mother liquor obtained in step 3, so that the p...

Embodiment 2

[0026] (1) Evenly mix the laterite nickel ore that is finely ground to below 150 μm with green vitriol, iron sulfide, and sulfur, and control the mass ratio of laterite nickel ore to green vitriol to be 1:1; the contents of iron sulfide and sulfur are respectively 1% of the total material mass % and 5%; the mixture was roasted at 500°C for 240min to obtain a solid product;

[0027] (2) The solid product obtained in step 1 is leached with water at 25° C., and the leached slurry is separated from solid and liquid to obtain a filter residue (the main component is Fe 2 o 3 , SiO 2 ) and a leach solution containing magnesium sulfate and nickel sulfate;

[0028] (3) Send the leachate obtained in step 2 to a sedimentation tank and add sodium sulfide with twice the molar amount of nickel ions in the leachate to carry out precipitation reaction at 60° C. to obtain a nickel sulfide product and a precipitation mother liquor;

[0029] (4) Slowly add ammonia water to the precipitated moth...

Embodiment 3

[0031] (1) Evenly mix the laterite nickel ore that is finely ground to below 150 μm with green vitriol and potassium sulfate, and control the mass ratio of laterite nickel ore and green vitriol to be 1:8; the content of potassium sulfate is 25% of the total material quality; mix the mixture Calcined at 900°C for 30 minutes to obtain a solid product;

[0032] (2) The solid product obtained in step 1 is leached with water at 60° C., and the leached slurry is subjected to solid-liquid separation to obtain a filter residue (the main component is Fe 2 o 3 , SiO 2 ) and a leach solution containing magnesium sulfate and nickel sulfate;

[0033] (3) Send the leachate obtained in step 2 to a sedimentation tank and add sodium sulfide with three times the molar amount of nickel ions in the leachate to carry out a precipitation reaction at 40° C. to obtain a nickel sulfide product and a precipitation mother liquor;

[0034] (4) Slowly add ammonia water to the precipitated mother liquor...

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Abstract

The invention discloses a method for extracting nickel from laterite-nickel ore and mineralizing CO2 simultaneously. The method comprises the following steps that (1) the crushed laterite-nickel ore is mixed with copperas and an additive at a certain temperature to be roasted, so that nickel and magnesium elements in the laterite-nickel ore are converted into corresponding sulfate; (2) the roasted product obtained in the first step is leached out with water to obtain a sulfate leaching solution and leaching residues rich in SiO2 and Fe2O3; (3) sodium sulfide is added into the leaching solution to obtain a nickel sulfide product and a precipitation mother solution; and (4) ammonia water is added into the mother solution obtained in the third step, and CO2 is further connected in to generate magnesium carbonate so as to realize CO2 mineralization.

Description

technical field [0001] The invention belongs to CO 2 In the field of emission reduction and comprehensive utilization of mineral resources, it mainly involves a kind of laterite nickel ore to extract nickel and mineralize CO 2 Methods. Background technique [0002] Since the industrial revolution, the use of fossil fuels has produced a large amount of greenhouse gases, mainly including carbon dioxide, nitrous oxide, methane, ozone and chlorofluorocarbons. In 2018, man-made greenhouse gas emissions reached 51.8Gt, an increase of 57% over 1990, and continued to grow at a rate of 2.9%. of which CO 2 The largest emissions reached 37Gt, accounting for about 72% of the total increase in greenhouse gas emissions, which means that CO 2 It also has the greatest "contribution" to global warming. According to the records of the Earth System Research Laboratory of the National Oceanic and Atmospheric Administration of the United States, the atmospheric CO 2 The concentration is on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B23/00C22B1/06C22B3/04C22B3/44C22B26/22C01G53/10C01F5/24
CPCC22B23/02C22B23/0407C22B23/0461C22B1/06C22B3/04C22B3/44C22B26/22C01G53/10C01F5/24Y02P10/20
Inventor 刘维燥曹俊吴泓利高宇翔蒋小勇何民宇刘清才
Owner CHONGQING UNIV
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