Clean production process for processing low-grade laterite-nickel ore by sodium hydroxide alkali fusion method

A technology of sodium hydroxide alkali and laterite nickel ore, which is applied in the direction of improving process efficiency, can solve the problems of low industrial utilization value of laterite nickel ore, inability to comprehensively utilize valuable metals, and non-compliance with clean production, so as to achieve product diversity Minimize, reduce adverse effects, and reduce pollution

Inactive Publication Date: 2010-10-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] To sum up, although there are many studies on the metallurgical process of laterite nickel ore, due to the different mineral factors such as the source, grade and crystal structure of laterite nickel ore, the nickel and cobalt leached by acid leaching treatment are generally caused. rate is low, only 60% to 80%
In addition, because laterite nickel ore contains mineral components such as chromium, aluminum and iron, traditional pyrometallurgy and hydrometallurgy processes cannot effectively comprehensively utilize these valuable metals, which leads to the industrial utilization value of laterite nickel ore on the one hand. On the other hand, it leads to a large amount of toxic and heavy waste after smelting, which does not meet the requirements of clean production

Method used

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Embodiment 1

[0031] The raw material laterite nickel ore comes from Indonesia, and its elemental composition is:

[0032] The raw material laterite nickel ore comes from Indonesia, and its element composition is (mass percentage): Fe: 47.01%, Ni: 0.52%, Co: 0.039%, Mg: 0.32%, Cr: 2.21%, Al: 4.16%, Si: 2.21%. After ball milling and screening, the ore whose particle size is below 200 mesh accounts for more than 90% of the total ore.

[0033]According to the mass ratio of solid sodium hydroxide and the ground laterite nickel ore is 0.65: 1, take sodium hydroxide and the ground laterite nickel ore; earlier sodium hydroxide is made into an aqueous solution with a mass fraction of 60% , and then wet mixed with the ground laterite nickel ore in the tank reactor by stirring, mixed evenly and dried, and then carried out temperature programming, so that the tank reactor was first kept at 150 ° C for 2 hours to dry the mixture, and then The temperature was raised to 650° C. at a rate of 5° C. / min f...

Embodiment 2

[0036] The raw material laterite nickel ore comes from Indonesia, and its element composition is (mass percentage): Fe: 47.01%, Ni: 0.52%, Co: 0.039%, Mg: 0.32%, Cr: 2.21%, Al: 4.16%, Si: 2.21%. After ball milling and screening, the ore whose particle size is below 200 mesh accounts for more than 90% of the total ore.

[0037] According to the mass ratio of solid sodium hydroxide and the ground laterite nickel ore is 1.8: 1, take by weighing sodium hydroxide and the ground laterite nickel ore; earlier sodium hydroxide is made into an aqueous solution with a mass fraction of 35% , and then wet mixed with the ground laterite nickel ore in the tank reactor by stirring, mixed evenly and dried, and then carried out temperature programming, so that the tank reactor was first kept at 150 ° C for 2 hours to dry the mixture, and then The temperature was raised to 800° C. at a rate of 5° C. / min for 120 minutes of calcination reaction to obtain a solid calcined material. The solid roas...

Embodiment 3

[0040] The raw material laterite nickel ore comes from the Philippines, and its element composition is (mass percentage): Fe: 52%, Ni: 1.05%, Co: 0.1%, Mg: 0.31%, Cr: 2.68%, Al: 1.68%, Si: 1.36%. After ball milling and screening, the ore whose particle size is below 200 mesh accounts for more than 90% of the total ore.

[0041] According to the mass ratio of solid sodium hydroxide and the ground laterite nickel ore is 0.2: 1, take sodium hydroxide and the ground laterite nickel ore; earlier sodium hydroxide is made into an aqueous solution with a mass fraction of 50% , and then wet mixed with the ground laterite nickel ore in a tank reactor by stirring, and after mixing evenly, the temperature was programmed to rise, so that the tank reactor was first kept at 150 ° C for 2 hours to dry the mixture, and then at 5 ° C / The temperature was raised to 400° C. for 200 minutes at a speed of 1 min to obtain a solid calcined material. The solid roasted material is discharged at high...

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Abstract

The invention relates to a clean production process for processing low-grade laterite-nickel ore by a sodium hydroxide alkali fusion method. The process comprises the following steps: taking laterite-nickel ore as a raw material, carrying out roasting reaction on the laterite-nickel ore and sodium hydroxide at high temperature, washing and filtering the roasted material, and leaching valuable metal salts in the laterite-nickel ore, such as water-soluble chromium, aluminium and the like generated after the reaction. High-temperature roasting damages the crystal lattice structure of the laterite-nickel ore, thereby greatly improving the leaching rate of nickel and cobalt in the subsequent high-pressure acid leaching process and the grade of Fe in acid leaching dregs; filtrate is prepared into chromium salt, aluminium salt and recyclable sodium hydroxide by operations, such as evaporation, crystallization, separation and the like, so that the laterite-nickel ore product is diversified. The leaching rate of hexavalent chromium in the laterite-nickel ore is more than 90%, the leaching rate of trivalent aluminium is more than 75%, the leaching rate of the nickel is more than 98%, the leaching rate of the chromium is more than 94%, and the Fe content of fine iron powder in the acid leaching dregs is more than 61%.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy technology and mineral resources processing, and specifically relates to a clean production process for alkali fusion treatment of low-grade laterite nickel ore by using sodium hydroxide. Background technique [0002] Because of its excellent performance, nickel has become an indispensable metal in aviation industry, defense industry and daily life. The mineable nickel resources in the world are divided into nickel sulfide ore and nickel oxide ore. Nickel oxide ore is red due to the oxidation of iron, so it is also called laterite nickel ore. At present, about 70% of the world's nickel is extracted from sulfide ore, but the nickel in the oxide deposit accounts for 65% of the total nickel reserve. Therefore, with the gradual reduction of nickel sulfide ore resources in the world, from laterite nickel The process of extracting nickel and cobalt from ores has gradually received widespread...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B1/02C22B3/06
CPCY02P10/20
Inventor 齐涛曲景奎董书通赵平王丽娜郭强魏广叶
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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