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Method for sintering and soft burning magnesia in tunnel kiln by using magnesite powder and particles

A technology for lightly burning magnesia and magnesite ore, applied in the field of ore processing, can solve the problems of pollution, complex process, waste of resources and the like, and achieve the effects of improving the working environment, reducing environmental pollution and reducing fuel consumption.

Inactive Publication Date: 2006-12-27
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The domestic method of producing light-burned magnesia by sintering in a high-temperature fluidized kiln requires first crushing the ore and grinding it into a 200-mesh fine powder, and then sintering, which involves large investment, many ancillary equipment, complex processes, high energy consumption, and low output. This method is basically eliminated in China
The current method used to produce light-burned magnesia is to sinter magnesite ore in a light-burned reverberatory kiln. The raw materials used to produce light-burned magnesia by this method must be blocks with a particle size greater than 200mm. This sintering method has energy consumption. High pollution, harsh working environment, high labor intensity of workers, difficult to control the quality of products, etc.
In addition, 30% of magnesite ore powder and granules are produced in mining operations, and this part of ore is basically abandoned or used for paving roads, even causing waste of resources and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Use magnesite ore as raw material to produce high-grade light-burned magnesia, select high-purity magnesite ore according to the weight ratio of magnesite ore, the content of MgO in magnesite ore is >46.5%, and the particle size of magnesite ore is 1-50mm30 ~50%, 50-70% of magnesite powder with a particle size of <1mm is used as raw material; then add 3-50% of the raw material weight of magnesite ore, light-burned magnesium oxide powder with a particle size of <0.1mm, after stirring and pressure molding, the Dry at 200-300°C for 30-90 minutes or naturally dry for 24 hours. After drying and shaping, put it on a trolley and send it to a tunnel kiln for high-temperature calcination. The kiln temperature is gradually heated from 200°C to 850-1100°C. After 30 to 60 minutes, it is cooled to 200 to 300° C. and then discharged from the kiln to obtain high-grade light-burned magnesia with a magnesia content of 90 to 98%.

Embodiment 2

[0014] Use magnesite ore as raw material to produce low-grade light-burned magnesia, choose low-purity magnesite ore according to the weight ratio of magnesite ore, the content of MgO in magnesite ore is less than 46.5%, and the particle size is 1-50mm. 30-50%, 50-70% of magnesite ore powder with a particle size of <1 mm is used as raw material; then 3-10% of the weight of magnesite ore raw material is added as a coagulant, and after stirring and pressure forming, the temperature is 200-300 ℃ Drying, drying time is 30-90 minutes or natural drying for 24 hours. After drying and shaping, it is stacked on a trolley and sent to a tunnel kiln for high-temperature calcination. The kiln temperature is gradually heated from 200°C to 850-1100°C and kept for 30-60 minutes. , cooled to 200-300 DEG C and then out of the kiln to obtain low-grade light-burned magnesia with a magnesia content of 85-96%.

Embodiment 3

[0016] Choose magnesite ore with a particle size of 50-200mm as the raw material, put it into a material rack made of refractory material, stack it on a trolley, and send it to a tunnel kiln for high-temperature calcination. The kiln temperature is gradually heated from 200°C to 850-1100°C, keep warm for 30-60 minutes, cool to 200-300°C and leave the kiln to obtain light-burned magnesia.

[0017] The method for sintering light-burned magnesia in a tunnel kiln by using magnesite powder and granules in the present invention is realized through two years of experiments and repeated demonstrations.

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Abstract

The invention discloses a magnesia light-sintering method in the tunnel kiln, which comprises the following steps: selecting 30-50 percent 1-50 mm magnesite ore and 50-70 percent magnesite powder with less than 1 mm grain size as raw material; adding light-magnesite powder or pulp wastewater as coagulant; stirring; moulding through pressure; drying; moulding; sintering in the tunnel kiln; selecting 50-200 mm grain size magnesite as raw material; putting the raw material in the container rack of flameproof material; placing on the stillage truck in the tunnel kiln to obtain light-burning magnesia through high-temperature sintering.

Description

technical field [0001] The invention belongs to the technical field of ore processing, and relates to a method for sintering light-burned magnesia in a tunnel kiln by utilizing magnesite ore powder and granules. Background technique [0002] Light-burned magnesia products are widely used in chemical industry, agriculture, light industry, environmental protection metallurgy, construction and other fields, and are the basic raw materials for the production of refractory materials. Magnesite is the main raw material for the production of light-burned magnesia. At present, the proven reserves of magnesite in the world are about 12.6 billion tons, and the proven reserves of magnesite in my country are more than 3 billion tons, accounting for about 24% of the world's total. The domestic method of producing light-burned magnesia by sintering in a high-temperature fluidized kiln requires first crushing the ore and grinding it into a 200-mesh fine powder, and then sintering, which i...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCC04B2/102C04B2/104
Inventor 满意
Owner 满意
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