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Process for smelting low-grade laterite

A laterite ore, low-grade technology, applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of low content of valuable metals, high energy consumption, large amount of slagging, etc., to achieve easy temperature control and energy saving Energy consumption, easy production effect

Inactive Publication Date: 2012-09-12
刘光火
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the composition of low-grade laterite ore is far different from the iron-rich ore used in blast furnace smelting, there are the following difficulties in blast furnace smelting: due to the low content of valuable metals, the amount of slagging is large, energy consumption is very high, and more coke needs to be passed To ensure the air permeability of the smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the low-grade lateritic ore containing 1.8% nickel element, 10.5% iron element, 22.5% silicon element, 14% magnesium element, 1.3% chromium element, 4.0% calcium element and 25% crystal water into the rotary kiln, and mix with 8 % of coal powder is preheated to 900°C to dehydrate and dry the crystal water in the laterite ore, and at the same time roast and pre-reduce part of the nickel, iron and chromium oxides in the laterite ore. The weight content of the pre-reduced metal is the total 22.4% of the amount of metal; then the charge in the rotary kiln is transferred to the high-temperature injection section, and 14% of pulverized coal is injected to raise the temperature to 1400°C. It is used for rapid reduction smelting to produce nickel-chromium iron, which is transformed from pre-reduction in the low-temperature section of the rotary kiln to rapid reduction in the injection high-temperature section to smelt and prepare nickel-chromium iron; Heat energy is recover...

Embodiment 2

[0027] Put low-grade lateritic ore containing 1.7% nickel, 10.8% iron, 18.6% silicon, 15.0% magnesium, 1.5% chromium, 3.5% calcium, and 22.8% crystal water into a rotary kiln with 12 % of coal powder is preheated to 1000°C to dehydrate and dry the crystal water in the laterite ore, and at the same time roast and pre-reduce part of the nickel, iron and chromium oxides in the laterite ore. The weight content of the pre-reduced metal is the total 25.0% of the amount of metal, and then transfer the charge in the rotary kiln to the injection high-temperature section, inject 12% coal powder to increase the temperature to 1550 ° C, the heat of the coal powder is 5800 kcal, and the coal powder degree is nano-shaped 1000 It is used for rapid reduction smelting to produce nickel-chromium iron, which is transformed from pre-reduction in the low-temperature section of the rotary kiln to rapid reduction in the injection high-temperature section to smelt and prepare nickel-chromium iron; He...

Embodiment 3

[0029] Put the low-grade lateritic ore containing 1.8% nickel, 12.2% iron, 25.0% silicon, 17.1% magnesium, 2.2% chromium, 4.6% calcium, and 24.1% crystal water into the rotary kiln, with 13 % of coal powder is preheated to 1100°C to dehydrate and dry the crystal water in the laterite ore, and at the same time roast and pre-reduce part of the nickel, iron and chromium oxides in the laterite ore. The weight content of the pre-reduced metal is the total 26.3% of the amount of metal, and then transfer the charge in the rotary kiln to the injection high-temperature section, inject 14% coal powder to increase the temperature to 1600 ° C, the heat consumption of the coal powder is 6000 kcal, and the coal powder is nano-sized 1000 mesh, used for rapid reduction smelting to produce ferronickel, from the pre-reduction in the low-temperature section of the rotary kiln to the rapid reduction in the high-temperature section of the rotary kiln to smelt and prepare ferronickel; The heat ener...

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PUM

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Abstract

The invention relates to a process for smelting low-grade laterite, in particular to a process for smelting low-grade laterite through a low-temperature preheating section and high-temperature injecting section method of a rotary kiln in coke-free mode. Low-grade laterite and pulverized coal are placed in the rotary kiln and preheated to the temperature of 800-1200 DEG C, crystallization water in the laterite is dehydrated and dried, part of nickel oxide, iron oxide and chromium oxide are roasted and pre-reduced, then kiln materials are transferred to the high-temperature injecting section and injected through the pulverized coal with the heat quantity of 5500 kilocalories to 6500 kilocalories and pulverized coal degree of nanometer-state 1000 meshes, and the temperature is increased to 1400 DEG C to 1800 DEG C for fast retailoring and producing nickel-chromium-iron. The smelting process uses no coke and is favorable for reducing cost, easy in temperature controlling and production controlling, convenient to operate and apt to achieve mechanization and automation.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to a process for smelting low-grade laterite ore, in particular to a process for cokeless smelting of low-grade laterite ore using a two-stage method of a low-temperature preheating section and a high-temperature injection section of a rotary kiln. Background technique [0002] Ferronickel is a precious oxidation-resistant metal. It is the basic raw material for the production of structural steel, stainless steel and heat-resistant cast steel. It can improve the corrosion resistance of stainless steel, improve the tensile strength, impact toughness and deformation capacity of steel, and improve High temperature oxidation resistance of steel. Traditional nickel metal production is mainly extracted from nickel sulfide, which accounts for 30% of the earth's resources. Its production process is mature, but its storage is relatively small. Forcing people to pay more attention ...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B23/00C21B13/08
CPCY02P10/20
Inventor 刘光火
Owner 刘光火