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Rapid reduction process of rotary kiln for laterite nickel ore

A technology of laterite nickel ore and rotary kiln, which is applied in the field of metallurgy and material science, can solve the problems of high reduction temperature, difficulty in drying, and weak mineralization ability, so as to improve the mechanical strength of hot and cold states, improve production efficiency, Reduces the effect of burst chalking

Active Publication Date: 2017-10-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of silicon and magnesium in laterite nickel ore, high melting point, weak mineralization ability, high temperature and long time for reduction, and high water content of laterite nickel ore, it is difficult to dry, and the energy consumption of directly entering the kiln is high.

Method used

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  • Rapid reduction process of rotary kiln for laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of laterite nickel ore rotary kiln rapid reduction process comprises the following steps:

[0037] (1) Take low-grade laterite nickel ore accounting for 80wt% of the total mixture (low-grade laterite nickel ore contains 18.56% iron and 1.80% nickel), and mix it with composite additives accounting for 20wt% of the total mixture to obtain a mixture. The composite additives include 15wt% water glass, 40wt% coal powder, 10wt% sodium humate and 35wt% limestone.

[0038] (2) Press the mixture into a mass to obtain a raw mass. The yield of the dough is 82.45%, the drop strength is 94%, the compressive strength of the dough is 134N / piece, and the thermal burst index is 0.50%.

[0039](3) Dry the raw dough through a shaft furnace, and then use the exhaust gas from the tail heat of the rotary kiln to preheat the dough to 950°C and then load it into the rotary kiln, and at the same time use the hot nitrogen to cool the reduction product to preheat the pulverized coal to 90...

Embodiment 2

[0043] A kind of laterite nickel ore rotary kiln rapid reduction process comprises the following steps:

[0044] (1) Take low-grade laterite nickel ore (18.56% iron and 1.80% nickel) which accounts for 85wt% of the total amount of the mixture, and mix with 15wt% composite additives to obtain a mixture. The composite additives include 15wt% water glass, 40wt% coal powder, 10wt% sodium humate and 35wt% limestone.

[0045] (2) Press the mixture into a mass to obtain a raw mass. The finished product rate of the dough is 80.35%, the drop strength is 92%, the compressive strength of the dough is 128N / piece, and the thermal burst index is 0.60%.

[0046] (3) Dry the raw agglomerate through a shaft furnace, then preheat the agglomerate to 900°C with the waste gas from the tail heat of the rotary kiln, and then load it into the rotary kiln, and preheat the coal powder to 950°C with the hot nitrogen that cools the reduction product, The coal powder is sprayed into the rotary kiln, and...

Embodiment 3

[0050] A kind of laterite nickel ore rotary kiln rapid reduction process comprises the following steps:

[0051] (1) Take the low-grade laterite nickel ore (the low-grade laterite nickel ore contains 18.56% iron and 1.80% nickel) accounting for 75wt% of the total mixture, and mix it with the composite additive accounting for 25wt% of the mixture to obtain a mixture. The composite additives include 15wt% water glass, 40wt% coal powder, 10wt% sodium humate and 35wt% limestone.

[0052] (2) Press the mixture into a mass to obtain a raw mass. The finished product rate of the dough is 84.55%, the drop strength is 96%, the compressive strength of the dough is 142N / piece, and the thermal burst index is 0.40%.

[0053] (3) Dry the raw dough through a shaft furnace, and then use the exhaust gas from the tail heat of the rotary kiln to preheat the dough to 900°C before loading it into the rotary kiln, and at the same time, use the hot nitrogen gas that cools the reduction product to pr...

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Abstract

The invention discloses a rapid reduction process of a rotary kiln for laterite nickel ore. The rapid reduction process of the rotary kiln for the laterite nickel ore includes the following steps that laterite nickel ore and a composite adding agent are mixed and then are pressed into block masses, and the composite adding agent comprises pulverized coal and limestone; the block masses are dried and pre-heated, and then enter the rotary kiln, reduction coal is added in, and reduction is performed under the reduction atmosphere so that reduced products can be obtained; the reduced products are cooled, screened and magnetically separated so that magnetic products can be obtained; and the magnetic products are crushed, subjected to ore grinding and magnetically separated, and high-nickel concentrate is obtained. According to the rapid reduction process of the rotary kiln for the laterite nickel ore, the low grade laterite nickel ore serves as raw materials, three manners that fuel is matched in the block masses, the block masses are preheated in a vertical furnace and coal is fed through hot air are developed to guarantee that the laterite nickel ore block masses are contained in the kiln while being hot, high temperature rapid reduction of the whole kiln is achieved, and therefore the rotary kiln temperature is lowered, the reduction time is shortened, and the high-nickel concentrate is effectively manufactured from the low grade laterite nickel ore.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and material science, in particular to a rapid reduction process of a laterite nickel ore rotary kiln. Background technique [0002] At present, about 60% of the world's nickel is extracted from sulfide ore, and the high-grade sulfide ore is gradually decreasing, and the mining depth is increasing day by day, and the cost is gradually increasing. Due to the gradual depletion of nickel sulfide ore resources, there are not many newly mined nickel sulfide mines, and the development of laterite nickel ore has attracted increasing attention. Laterite nickel ore will replace nickel sulfide ore as the main source of nickel production in the near future. It is imperative to improve the traditional technology of smelting laterite nickel ore and the development of new technology. It has been proven that the nickel metal reserves of laterite nickel ore in the world are 160 million tons, but our country ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02
CPCC22B23/021
Inventor 潘建朱德庆李启厚郭正启梁钟仁李紫云田宏宇李思唯
Owner CENT SOUTH UNIV
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