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 materia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1

[0012] Use magnesite ore as raw material to produce high-grade light-burned magnesia. High-purity magnesite ore is selected according to the weight ratio of magnesite ore. The content of MgO in magnesite ore is more than 46.5%, and the particle size is 1-50mm. ~50%, particle size <1mm 50~70% of magnesite ore powder as raw material; then add 3~50% of magnesite ore raw material weight and light burnt magnesia powder with particle size <0.1mm, after stirring, pressure forming, at temperature Drying at 200~300℃, drying time 30~90 minutes or natural drying for 24 hours. After drying and finalizing, it is placed on a trolley and sent to a tunnel kiln for high temperature calcination. The kiln temperature is gradually heated from 200℃ to 850~1100℃, keeping warm After 30-60 minutes, it is cooled to 200-300°C and discharged out of the kiln to obtain high-grade light-burned magnesia with a magnesia content of 90-98%.

Example Embodiment

[0013] Example 2

[0014] Use magnesite ore as raw material to produce low-grade light-burned magnesia, and select 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 <1mm is the raw material; then 3-10% of the weight of the magnesite ore raw material is added as a coagulant. After stirring and pressure molding, the temperature is 200-300℃ Dry and dry for 30 to 90 minutes or natural drying for 24 hours. After drying and setting, the stack is placed on a trolley and sent to a tunnel kiln for high-temperature calcination. The kiln temperature is gradually heated from 200 to 850 to 1100, and the temperature is kept for 30 to 60 minutes. After being cooled to 200-300°C, it is discharged out of the kiln to obtain low-grade light-burned magnesia with a magnesia content of 85-96%.

Example Embodiment

[0015] Example 3

[0016] Choose magnesite ore with a particle size of 50~200mm as the raw material, put it in a storage 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℃ to 850~1100℃, heat preservation for 30~60 minutes, cooled to 200~300℃, then exit the kiln to obtain light-burned magnesia.

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

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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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