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Clean production technology for processing low-grade laterite-nickel ore by sodium carbonate alkali fusion

A technology for laterite nickel ore and cleaner production, which is applied in the field of clean production technology of low-grade laterite nickel ore, can solve the problems of low industrial utilization value of laterite nickel ore, inability to comprehensively utilize valuable metals, discharge of toxic and heavy waste, and the like. The effect of reducing adverse effects, reducing environmental pollution, and eliminating pollution

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

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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 with a particle size below 200 mesh accounts for more than 90% of the total ore.

[0032] According to the mass ratio of solid sodium carbonate and the laterite nickel ore after grinding, the proportioning of 0.2: 1 is taken by weighing sodium carbonate and the laterite nickel ore after grinding; earlier the sodium carbonate is made into an aqueous solution with a mass fraction of 30%, and then mixed with The ground laterite nickel ore is wet-mixed by stirring in a corundum crucible. After mixing evenly, it is placed in an oven at a temperature of 150°C for 8 hours and then discharged at a high temperature. Put the mixed dried material into a muffle furnace, and roast it at 1200° C. for 3 hours to obtain a solid roasted material. Grind the so...

Embodiment 2

[0035] 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.

[0036] According to the mass ratio of solid sodium carbonate and the laterite nickel ore after grinding, the proportioning of 0.8: 1 is taken by weighing sodium carbonate and the laterite nickel ore after grinding; earlier, sodium carbonate is made into an aqueous solution with a mass fraction of 45%, and then mixed with The ground laterite nickel ore is wet-mixed by stirring in a corundum crucible, mixed evenly, put into an oven at a temperature of 200°C for 6 hours, and then discharged at a high temperature. Put the mixed dried material into a muffle furnace, and roast it at 1050° C. for 1.5 hours to obtain a solid roasted material. Grind the solid calcined...

Embodiment 3

[0039] 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 with a particle size below 200 mesh accounts for more than 90% of the total ore.

[0040] According to the mass ratio of solid sodium carbonate and the laterite nickel ore after grinding, the proportioning of 1.5: 1 is taken by weighing sodium carbonate and the laterite nickel ore after grinding; earlier, sodium carbonate is made into an aqueous solution with a mass fraction of 65%, and then mixed with The ground laterite nickel ore is wet-mixed by stirring in a corundum crucible, mixed evenly, put into an oven with a temperature of 150°C for 8 hours, and then discharged at room temperature. Put the mixed dried material into a muffle furnace, and roast it at 800° C. for 0.5 hour to obtain a solid roasted material. Grind the solid roasted mat...

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Abstract

The invention relates to a clean production technology for processing low-grade laterite-nickel ore by sodium carbonate alkali fusion. The invention takes laterite-nickel ore as a raw material, causes laterite-nickel ore and sodium carbonate to roast at high temperature, washes and filters the roasted material to leach valuable metal salts, such as water-soluble chromium, aluminum and the like generated in the laterite-nickel ore after reaction. High-temperature roasting damages the crystal lattice structure of the laterite-nickel ore so as to greatly improve the leaching rate of subsequent high-pressure acid leaching technical nickel and cobalt and improve the grade of Fe in acid leaching dregs; filtrate is prepared into chromium salt and aluminum salt 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 aluminum is more than 65%, the leaching rate of nickel is more than 98%, the dipping rate of the chromium is more than 94%, and 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 nonferrous metal metallurgy technology and mineral resources processing, and in particular relates to a clean production process for alkali fusion treatment of low-grade laterite nickel ore by using sodium carbonate. 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): C22B23/00C22B1/02C22B3/22C22B3/06
CPCY02P10/20
Inventor 曲景奎齐涛董书通赵平王丽娜王成彦郭强魏广叶李莉庞俊雷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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