Method for smelting ferronickel or nismatte with laterite-nickel ore

A technology of laterite nickel ore and nickel matte, which is applied in the smelting process of laterite nickel ore, can solve the problems of large amount of ore, high energy consumption, and high smelting cost, achieve uniform furnace temperature, improve metal recovery rate, and invest per ton of nickel low effect

Inactive Publication Date: 2010-10-27
YUNNAN TIN GROUP HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for smelting ferronickel or nickel matte with laterite nickel ore, which has simple process, easy operation, less invest

Method used

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  • Method for smelting ferronickel or nismatte with laterite-nickel ore
  • Method for smelting ferronickel or nismatte with laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the steps are as follows:

[0021] A. The chemical composition of the laterite nickel ore used is as follows:

[0022] element

Ni

co

FeO

MgO

Al 2 o 3

SiO 2

CaO

content%

1.03

0.039

17.22

27.3

4.84

35.72

0.32

[0023] 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.

[0024] 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.

[0025] C...

Embodiment 2

[0028] Embodiment 2 steps are as follows:

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

[0030] 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.

[0031] B. In the fifth-stage suspension drying and calcination device, the high-temperature flue gas with a temperature of 1100°C produced by the combustion of materials and pulverized coal fuel is subjected to countercurrent suspension heat exchange, and the residence time of the materials is 4 minutes, and the materials with a temperature of 750°C are produced from the fifth-stage suspender After entering the pre-reducer, the flue gas with a temperature of 250°C from the first stage enters the vertical mill.

[0032] C. Spray coke powder with a particle size of ...

Embodiment 3

[0034] Embodiment 3 steps are as follows:

[0035] The first step is the same as step A of Example 1.

[0036] 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.

[0037] B. In the 7-stage suspension drying and calcination device, the high-temperature flue gas with a temperature of 1100°C produced by the combustion of materials and pulverized coal fuel is subjected to countercurrent suspension heat exchange. The residence time of the materials is 6 minutes, and the materials with a temperature of 800°C are produced from the seventh-stage suspender. Entering the pre-reducer, the flue gas with a temperature of 200°C from the first stage enters the vertical mill.

[0038] C....

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Abstract

The invention relates to a laterite nickel ore smelting process, in particular to a method for smelting ferronickel or nismatte with laterite-nickel ore, which comprises the following steps: crushing the laterite-nickel ore with a vertical mill until the particle size is less than 1mm, feeding the crushed laterite-nickel ore into various levels of suspension, drying and calcinating devices and a pre-reduction device in sequence, and guiding flue gas generated by the various levels of suspension, drying and calcinating devices into the vertical mill; spraying bituminous coal powder into the pre-reduction device for reduction and calcination of the materials in a suspension state, directly guiding the exhaust of the pre-reduction device into the the last level of drying and calcinating device, and smelting hot materials after pre-reduction in a DC furnace to produce the ferronickel or nismatte. The invention has the advantages of simple process, easy operation, low investment and high thermal efficiency, and can solve the problems of high energy consumption and high smelting cost in the traditional pyrometallurgy of the laterite-nickel ore.

Description

technical field [0001] The invention relates to a smelting process of laterite nickel ore, in particular to a method for smelting ferronickel or nickel matte from laterite nickel ore. 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 conventional fire method and the wet method have the problem of high cost. Nickel oxide deposits...

Claims

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Application Information

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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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