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Apparatus and method for smelting magnesite with low power consumption

A magnesite and low power consumption technology is applied in the field of devices for smelting magnesite with low power consumption, so as to achieve the effects of realizing energy saving and environmental protection, improving the densification process and reducing the production cost.

Pending Publication Date: 2019-06-07
ANSHAN ZHENGDA FURNACE CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The application of the rotary kiln originated from cement production. The invention of the rotary kiln has led to the rapid development of the cement industry and also promoted people's research on the application of the rotary kiln. At present, the rotary kiln has been widely used in many industrial fields, but in fused magnesia In production, especially the application of magnesite pretreatment before the electric arc furnace has not been reported

Method used

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  • Apparatus and method for smelting magnesite with low power consumption

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Embodiment 1

[0036] A method for smelting magnesite with low power consumption, which is composed of ore dressing, crushing, decomposition and smelting, natural cooling, crushing, and sorting, and is characterized in that the decomposition and smelting is carried out in three steps:

[0037] The first step is to crush the magnesite ore into 8~12mm blocks, and add the 30℃~35℃ block from the magnesite feeding pipe at the kiln tail of the rotary kiln, and the rotary kiln will use 0.269~1.34 / r·min -1 Rotating at a high speed, the block is preheated and roasted in the kiln. After firing, the material is discharged from the kiln head. The temperature of the discharge is 600 ° C ~ 620 ° C, and the temperature of the primary air entering the kiln is 40 ° C ~ 45 ° C.

[0038] The second step is that the output of the rotary kiln enters the cooler through the chute, and the secondary air is preheated in the cooler, and the block is discharged from the outlet of the cooler. The temperature of the sec...

Embodiment 2

[0041]A method for smelting magnesite with low power consumption, which is composed of ore dressing, crushing, decomposition and smelting, natural cooling, crushing, and sorting, and is characterized in that the decomposition and smelting is carried out in three steps:

[0042] The first step is to crush the magnesite ore into 8~12mm blocks, and add the 28°C~32°C blocks through the magnesite feed pipe at the kiln tail of the rotary kiln, and the rotary kiln is 0.269~1.34 / r·min -1 Rotating at a high speed, the block is preheated and roasted in the kiln. After firing, the material is discharged from the kiln head. The temperature of the discharge is 750 ° C ~ 800 ° C, and the temperature of the primary air entering the kiln is 40 ° C ~ 45 ° C.

[0043] The second step is that the output of the rotary kiln enters the cooler through the chute, and the secondary air is preheated in the cooler, and the block is discharged from the outlet of the cooler. The temperature of the seconda...

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Abstract

The invention relates to the field of refractory raw material magnesite smelting, in particular to an apparatus and method for smelting magnesite with the low power consumption. The apparatus is characterized by comprising a rotary kiln, a cooling machine and an electric arc furnace, the method is characterized by consisting of the processes of beneficiation, crushing, decomposition smelting, natural cooling, crushing, and sorting, wherein the decomposition smelting process is carried out in three steps: crushing and pre-heating roasting in the rotary kiln, secondary preheating in the coolingmachine, and submerged arc smelting in the electric arc furnace. Compared with an apparatus and method in the prior art, the apparatus and method has the following beneficial effects: 1) the heating decomposition process of magnesite in the electric arc furnace is replaced by the rotary drying pre-heating apparatus, so that the electric consumption and the service time of the electric arc furnaceare effectively reduced, energy saving and environmental protection are achieved, the production cost of fused magnesite is reduced; and 2) the densification process of materials can be effectively improved by the rotary drying preheating of magnesite. According to the apparatus, 300 kg of standard coal is only consumed to produce 1 ton of fused magnesia, the production cost of fused magnesia is greatly reduced, and energy saving and environmental protection are achieved.

Description

technical field [0001] The invention relates to the field of smelting refractory raw material magnesite, in particular to a device and method for smelting magnesite with low power consumption. Background technique [0002] Fused magnesia is a refractory material. It is mainly obtained by decomposing and melting magnesite ore (MgCO3) or melting and cooling light-burned magnesia (MgO) as raw material. This product is a material with high purity, large crystal grains, compact structure, strong slag resistance, and good thermal shock stability. Important raw materials, the melting equipment is electric arc furnace. An electric arc furnace is an electric furnace that uses the heat generated by an electric arc to melt metallic or non-metallic materials. In the field of refractory materials, because the furnace temperature is easy to control and the equipment occupies a small area, it is suitable for smelting refractory raw materials. However, the same industry at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
Inventor 杨森罗旭东侯庆冬李季佳满奕然
Owner ANSHAN ZHENGDA FURNACE CHARGE