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A kind of method for preparing ferronickel concentrate by selective reduction of laterite nickel ore

A technology of lateritic nickel ore and ferronickel concentrate, which is applied in the field of metallurgy and material science, can solve the problems of insufficient grain growth of ferronickel, poor selective reduction effect, and high pulverization rate of pellets, so as to reduce the input into the furnace Processing capacity, guaranteed grade, enhanced effect of direct reduction

Active Publication Date: 2019-12-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people mainly realize the selective reduction of laterite nickel ore by controlling the reduction process factors such as reduction temperature, time, and the amount of reducing agent, but there will be problems such as excessive reduction temperature, high pellet pulverization rate, serious ring formation, and selective reduction. Poor effect, insufficient growth of nickel-iron grains leading to difficult magnetic separation and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing ferronickel concentrate through selective reduction of laterite nickel ore, comprising the following steps:

[0031] (1) Select the limonite-type lateritic nickel ore containing 40.09% iron and 0.97% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0032] (2) Select the humic laterite-nickel ore containing 23.16% iron and 1.42% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0033] (3) Limonite-type laterite-nickel ore and humic-type laterite-nickel ore are mixed according to a mass ratio of 6:4 to obtain laterite-nickel ore.

[0034] (4) Mix 89wt% laterite nickel ore, 5.0wt% coal and 6.0wt% additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate and sodium carbonate in ...

Embodiment 2

[0040] A method for preparing ferronickel concentrate through selective reduction of laterite nickel ore, comprising the following steps:

[0041] (1) Select the limonite-type lateritic nickel ore containing 40.09% iron and 0.97% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0042] (2) Select the humic laterite-nickel ore containing 23.16% iron and 1.42% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0043] (3) The limonite-type laterite-nickel ore and the humic-type laterite-nickel ore are mixed according to the mass ratio of 5.5:4.5 to obtain the laterite-nickel ore.

[0044] (4) Mix 89wt% laterite nickel ore, 5.0wt% coal and 6.0wt% additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate and so...

Embodiment 3

[0050] A method for preparing ferronickel concentrate through selective reduction of laterite nickel ore, comprising the following steps:

[0051] (1) Select the limonite-type lateritic nickel ore containing 40.09% iron and 0.97% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0052] (2) Select the humic laterite-nickel ore containing 23.16% iron and 1.42% nickel, dry it at 200°C until the water content is less than 15%, and then crush it until the particle size is less than 0.074mm, accounting for more than 75%.

[0053] (3) The limonite-type laterite-nickel ore and the humic-type laterite-nickel ore are mixed according to a mass ratio of 5:5 to obtain the laterite-nickel ore.

[0054] (4) Mix 89wt% laterite nickel ore, 5.0wt% coal and 6.0wt% additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate and sodium c...

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Abstract

The invention provides a method for preparing nickel-iron concentrate through selective reduction of laterite-nickel ore. The method comprises the following specific steps: mixing the laterite-nickel ore, a reducing agent and an additive to obtain a mixture; briquetting the mixture to obtain raw briquettes; drying the raw briquettes, and performing selective reduction in a reducing atmosphere to obtain a reduced product; grinding the reduced product, and performing magnetic separation to obtain the nickel-iron concentrate. With the method provided by the invention, reduction of iron is inhibited and the selectivity in the reducing process is improved while the selective reduction temperature is reduced, so that the effect of reinforcing direct reduction of nickel in the humus-type laterite-nickel ore is achieved; the nickel-iron concentrate provided by the method has a relatively high grade and a relatively high recycling rate.

Description

technical field [0001] The invention relates to the technical field of metallurgy and material science, in particular to a method for preparing ferronickel concentrate through selective reduction of laterite nickel ore. Background technique [0002] The pyrometallurgy process of low-grade lateritic nickel ore is of great significance to my country's resource economy and iron and steel industry. In terms of industry, since 2005, China has become the country with the largest nickel consumption in the world, which is mainly due to the growth of stainless steel production and demand in my country. Due to the scarcity of steel scrap resources in my country, crude ferronickel is still the main raw material for smelting stainless steel in electric furnaces, and the production of ferronickel by direct reduction-electric furnace smelting is the only pyrotechnic process maturely applied to the industrial production of laterite nickel ore. It can be seen that the use of pyrometallurgy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B5/12C22B23/02C21B13/00
CPCC21B13/006C22B1/2406C22B5/12C22B23/005C22B23/021
Inventor 朱德庆潘建李启厚郭正启田宏宇李紫云梁钟仁
Owner CENT SOUTH UNIV
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