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Method for drying and prereducing laterite-nickel ores

A laterite nickel ore and drying technology, applied in the field of metallurgy, can solve the problems of large quantity, low thermal efficiency, large investment, etc., and achieve the effects of simple process, easy operation and low investment.

Inactive Publication Date: 2011-11-09
YUNNAN TIN GROUP HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rotary kiln generally has a large investment, low thermal efficiency, a large amount of energy is required for drying, and the smelting cost is relatively high.

Method used

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  • Method for drying and prereducing laterite-nickel ores
  • Method for drying and prereducing laterite-nickel ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the steps are as follows:

[0017] A. The chemical composition of the laterite nickel ore used is as follows:

[0018] the element

Ni

co

FeO

MgO

Al2O3

SiO2

CaO

Content%

1.03

0.039

17.22

27.3

4.84

35.72

0.32

[0019] The ore directly extracted from the stope has a water content of 25%, and the blocky ore > 100mm is removed by a strip sieve (crushed by a crusher < 100mm and then enters the vertical mill), and the underscreen material enters the vertical mill for drying and crushing.

[0020] B. Use the 3-stage suspension drying and calcining device to output the flue gas with a temperature of 300°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.2mm and the moisture content of the material is 10%. After being collected by a cyclone and a bag filter, it enters 3 Level suspension drying calciner.

[0021] ...

Embodiment 2

[0023] Embodiment 2 steps are as follows:

[0024] The first step is the same as step A of Example 1.

[0025] A. Use the 5-stage suspension drying and calcining device to output the flue gas with a temperature of 250°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.6mm and the moisture content of the material is 15%. Level suspension drying calciner.

[0026] B. In the 5-stage suspension drying and calcination device, the material and the high-temperature flue gas produced by pulverized coal combustion with a temperature of 1100 ° C are subjected to countercurrent suspension heat exchange. The material residence time is 4 minutes, and the material output from the fifth-stage suspender with a temperature of 750 ° C enters In the pre-reducer, the flue gas with a temperature of 250°C from the first stage enters the vertical mill.

[0027] C. Spray coke powder with a particle size of <0.1mm accounting for 3% of the ...

Embodiment 3

[0028] Embodiment 3 steps are as follows:

[0029] The first step is the same as step A of Example 1.

[0030] A. Use the 7-stage suspension drying and calcining device to output the flue gas with a temperature of 200°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.8mm, and the material moisture is 17%. It is collected by a cyclone and a bag filter and then enters the 7 Level suspension drying calciner.

[0031] B. In the 7-stage suspension drying and calcination device, the material and the high-temperature flue gas produced by the combustion of coal powder are subjected to countercurrent suspension heat exchange. The material residence time is 6 minutes, and the material output from the seventh-stage suspender with a temperature of 800 ℃ enters In the pre-reducer, the flue gas with a temperature of 200°C from the first stage enters the vertical mill.

[0032] C. Spray carbon black powder accounting for 1.5% of...

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Abstract

The invention relates to a method for drying and prereducing laterite-nickel ores with low energy consumption, belonging to the technical field of metallurgy. The method is especially suitable for drying and prereducing low grade laterite-nickel ores. The method is characterized by the technological processes as follows: grinding the laterite-nickel ores until the grain size is less than 1mm by avertical mill, ensuring the ground laterite-nickel ores to enter into a multistage suspension drying and calcining device and a prereducer in sequence, simultaneously introducing the flue gas generated by the suspension drying and calcining device into the vertical mill; spraying the coal, coke, carbon black solid reducing agents or vulcanizer powder into the prereducer, reducing, calcining or vulcanizing the materials in the suspension state, ensuring the tail gas from the prereducer to directly enter into the final drying and calcining device to produce prereduced or vulcanized thermal state materials. The method is simple in process, easy to operate, low in investment, high in thermal efficiency and low in smelting cost.

Description

technical field [0001] The invention relates to a low-energy-consumption drying and pre-reduction method of laterite nickel ore, which is particularly suitable for drying and pre-reduction of low-grade laterite nickel ore, and belongs to the technical field of metallurgy. Background technique [0002] Nickel (Ni) is a rare and precious metal with a wide range of uses. It is indispensable in various industries such as aerospace, aviation, navigation, national defense, scientific research, industry, agriculture, medical care, automobiles, steel and civil use. Nickel-containing minerals on the earth's crust are becoming rarer and lower in grade. It is very difficult to extract nickel from low-grade laterite nickel ore. Conventional wet process has high production cost and great environmental pollution. Conventional fire smelting has high crystal water content of laterite nickel ore. Rotary kiln drying can High consumption and high production cost. In short, both the convention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02
Inventor 董瀚雷毅温宗汉程睿涵王炜董保生杨成林尹久发王青康靖
Owner YUNNAN TIN GROUP HLDG
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