A method and system for the synergistic preparation of nickel sulfate by ammonia-enhanced laterite ore reduction calcined pulp method for desulfurization and nitric acid

A technology of laterite ore and nickel sulfate, applied in the direction of improving process efficiency, can solve the problems of large ammonia volatilization loss, complex process and high energy consumption, and achieve reduced energy consumption and labor intensity, high resource utilization rate, and good economic benefits. Effect

Active Publication Date: 2021-03-09
KUNMING UNIV OF SCI & TECH
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  • Description
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AI Technical Summary

Problems solved by technology

This method combines the fire method and the wet method to obtain good technical indicators, but when the grade is low, the cost of using the fire method and the wet method together is high, and it is difficult to obtain good economic benefits
[0006] The reduction roasting-ammonia leaching method was first used in the industrial treatment of laterite ore, which has the advantages of mature technology and high nickel recovery rate, but the disadvantage is that the process is complicated
The common problem in these processing methods of laterite ore is that the comprehensive utilization of resources has not been achieved.
Moreover, the entire reduction roasting-ammonia leaching process still has problems such as high energy consumption in ammonia distillation and large volatilization loss of ammonia.
[0007] Therefore, the research and development of a method for processing laterite ore with simple process, low magnesium and iron dissolution rates, low leaching agent consumption, high-value nickel products, and the combination of desulfurization and denitrification process has not been well received so far. The utilization of low-grade laterite ore is of great significance

Method used

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  • A method and system for the synergistic preparation of nickel sulfate by ammonia-enhanced laterite ore reduction calcined pulp method for desulfurization and nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1. First reduce and roast the laterite ore, and crush and grind the reduced calcine of the laterite ore until the particle size is less than 1mm, add ammonia water, and fully mix to obtain the ore pulp;

[0046] S2, will contain SO 2 , NO X flue gas and O 2 Drum directly into the slurry in step S1, fully contact, and maintain an oxidizing atmosphere. The laterite ore is reduced to calcine at 50°C, so that nickel and cobalt are fully complexed and leached, and the pH value of the leachate is controlled by supplementing ammonia water. gas discharge;

[0047] S3, performing solid-liquid separation on the ore pulp treated in step S2 to obtain filtrate and filter residue, and discharge the filter residue;

[0048] S4. In the separated filtrate, first add a precipitating agent to precipitate cobalt, separate the solid and liquid to obtain a liquid, and after the ammonia is recovered by heat, a nickel sulfate solution is obtained;

Embodiment 2

[0050] S1. First reduce and roast the laterite ore, and crush and grind the reduced calcine of the laterite ore until the particle size is less than 1mm, add ammonia water, and fully mix to obtain the ore pulp;

[0051] S2, will contain SO 2 , NO X flue gas and O 2 Drum directly into the slurry in step S1, fully contact, and maintain an oxidizing atmosphere. The laterite ore is reduced to calcine at 70°C, so that nickel and cobalt are fully complexed and leached, and the pH value of the leachate is controlled by supplementing ammonia water. gas discharge;

[0052] S3, performing solid-liquid separation on the ore pulp treated in step S2 to obtain filtrate and filter residue, and discharge the filter residue;

[0053] S4. In the separated filtrate, a precipitant is first added to precipitate cobalt, and the solid-liquid is separated to obtain a liquid. After the ammonia is recovered by heat, a nickel sulfate solution is obtained.

Embodiment 3

[0055] S1. First reduce and roast the laterite ore, and crush and grind the reduced calcine of the laterite ore until the particle size is less than 1mm, add ammonia water, and fully mix to obtain the ore pulp;

[0056] S2, will contain SO 2 , NO X flue gas and O 2 Drum directly into the slurry in step S1, fully contact, and maintain an oxidizing atmosphere. The laterite ore is reduced to calcine at 60°C, so that nickel and cobalt are fully complexed and leached, and the pH value of the leachate is controlled by supplementing ammonia water. gas discharge;

[0057] S3, performing solid-liquid separation on the ore pulp treated in step S2 to obtain filtrate and filter residue, and discharge the filter residue;

[0058] S4. In the separated filtrate, a precipitant is first added to precipitate cobalt, and the solid-liquid is separated to obtain a liquid. After the ammonia is recovered by heat, a nickel sulfate solution is obtained.

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Abstract

The invention discloses a method and a system for synergistically preparing nickel sulfate through ammonia-enhanced laterite ore reduction calcined pulp method for desulfurization and nitric acid. The method comprises the steps of pulp preparation, complexation leaching, solid-liquid separation of pulp and preparation of nickel sulfate. The invention adopts ammonia-enhanced laterite ore reduction calcined ore pulp method to desulfurize and nitricate synergistically to prepare nickel sulfate, convert sulfur dioxide in waste gas into ammonium sulfate solution to leach laterite nickel ore, and the leached solution can complex and adsorb nitrogen compounds to achieve denitrification The whole process couples multiple processes to achieve the effect of multi-objective realization, which has the advantages of high leaching rate, reduced energy consumption and labor intensity, high resource utilization rate, and good economic benefits. The reaction chamber of the system of the present invention can effectively improve the reaction rate; the system of the present invention can realize automatic batching, feeding and discharging functions, and can automatically perform leaching treatment and subsequent precipitation treatment, and the operation is very convenient.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and flue gas desulfurization and denitrification, and specifically relates to a method and a system for synergistically preparing nickel sulfate by ammonia-enhanced laterite ore reduction calcined pulp method desulfurization and denitrification. Background technique [0002] At present, the production of nickel products from laterite ore mainly includes pyrotechnic and wet process. Pyrotechnical processes include blast furnace smelting nickel-sulfur or ferronickel, submerged arc furnace smelting ferronickel, rotary kiln reduction-magnetic separation-electric furnace smelting to produce ferronickel, rotary kiln pre-reduction-submerged arc furnace melting and smelting ferronickel, etc.; wet process There are pre-reduction-ammonia leaching, atmospheric pressure acid leaching (including heap leaching), high pressure acid leaching, bacterial leaching, etc. [0003] Nickel in laterite ore ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B1/02C22B3/08C22B3/44C22B3/02
CPCC22B1/02C22B3/02C22B3/08C22B3/44C22B23/043C22B23/0461Y02P10/20
Inventor 田森林崔慧姝赵群李英杰胡学伟黄建洪
Owner KUNMING UNIV OF SCI & TECH
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