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A method for calcining high-alumina bauxite in a tunnel kiln with variable cross-section

A technology of high-alumina bauxite and tunnel kiln, which is applied in the field of calcining high-alumina bauxite to achieve high production efficiency, environmental protection and quality improvement

Active Publication Date: 2016-12-14
辽宁科大顺程工业技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solving the problems existing in kilns in the calcination of high alumina bauxite

Method used

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  • A method for calcining high-alumina bauxite in a tunnel kiln with variable cross-section
  • A method for calcining high-alumina bauxite in a tunnel kiln with variable cross-section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Such as figure 1 As shown, the high-alumina bauxite homogenized material is evenly laid on the kiln car of the tunnel kiln, and the kiln car is pushed into the kiln from the kiln head and enters the pre-tropical zone 1. The heat source of the pre-tropical zone is the combustion of fuel flowing in from the calcination zone The generated hot flue gas can make full use of the heat it carries, improve fuel utilization and reduce energy consumption. In the preheating zone, the high-alumina bauxite homogenized material is preheated for 8 to 16 hours, and the temperature is raised to 1450-1750°C. After preheating the high-alumina bauxite homogenized material, the temperature of the hot flue gas drops below 250°C.

[0016] Then the kiln car enters the calcination zone 2, the kiln roof of this calcination zone is a slope gradual change type, and the kiln roof gradually becomes lower from the preheating zone to the cooling zone, and the total effective height reduction of the kil...

Embodiment 2

[0019] so figure 2 It shows that the high-alumina bauxite homogenized material is evenly laid on the kiln car of the tunnel kiln, and the kiln car is pushed into the kiln from the kiln head and enters the pre-tropical zone 1. The heat source of the pre-tropical zone is generated by the combustion of fuel flowing from the calcination zone. The hot flue gas can make full use of the heat it carries, improve fuel utilization and reduce energy consumption. In the preheating zone, the high-alumina bauxite homogenized material is preheated for 8 to 16 hours, and the temperature is raised to 1450-1750°C. After preheating the high-alumina bauxite homogenized material, the temperature of the hot flue gas drops below 250°C.

[0020] Then the kiln car enters the calcination zone 2, the kiln roof of this calcination zone is a stepwise gradual change type, and the total reduction of the effective height of the kiln is 20% to 40%. The high-alumina bauxite homogenized material is heated and...

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Abstract

The invention discloses a method for calcining high-alumina bauxite in a variable-section tunnel kiln to produce high-quality and low-cost high-alumina bauxite clinker. The method uses high-alumina bauxite homogenized material as raw material, and is calcined in a tunnel kiln with variable cross-section. The total variation of the effective height is 20-40%. Process steps include preheating, calcination and cooling. In the preheating zone, the high alumina bauxite homogenized material is preheated for 8-16 hours, and the temperature is increased to 1450-1750°C. The temperature of the calcined belt is controlled at 1450-1750° C., and the calcined time is 1-5 hours. In the cooling zone, the cold air blasted from the kiln tail cools the calcined material, and the material is cooled to below 100°C and pushed out of the kiln. The invention can improve the quality stability and grade of calcined products, reduce energy consumption, save energy, improve production efficiency and production capacity, have less emission, and are beneficial to environmental protection.

Description

technical field [0001] The invention relates to a method for calcining high alumina bauxite, in particular to a method for calcining high alumina bauxite in a variable-section tunnel kiln. Background technique [0002] High alumina bauxite clinker produced by calcination of high alumina bauxite ore is widely used in aluminum smelting, cement, artificial corundum, chemical industry, metallurgy and other industrial sectors. The equipment used in the existing high alumina bauxite calcining method mainly includes shaft kiln, downdraft kiln and rotary kiln. Publication No. CN200986382Y "Gas Type Shaft Kiln for Calcining Bauxite and Spherical Products" and Publication No. CN201293538Y "Environmentally Friendly Bauxite Shaft Kiln" disclose the calcination method using these devices. Shaft kilns and downdraft kilns have defects such as high energy consumption, large emissions, low efficiency, unstable product quality, serious environmental pollution, high labor intensity, harsh wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/74F27B9/02
Inventor 曲殿利郭玉香田琳李国华
Owner 辽宁科大顺程工业技术研究有限公司
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