Resource utilization method of waste magnesia powder after treating oriented silicon steel

A technology for discarding magnesia powder and oriented silicon steel is applied in the field of solid waste recycling, which can solve the problems of accumulation and occupation environment, pollution, etc., and achieve the effects of improving the viscosity of slag, a simple method of forming balls, obvious environmental protection and economic value.

Active Publication Date: 2014-10-15
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a resource utilization method of waste magnesia powder after heat treatment of oriented silicon steel, to realize the recycling of the waste magnesia powder, and to solve the problems of accumulation and environmental pollution

Method used

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  • Resource utilization method of waste magnesia powder after treating oriented silicon steel

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Experimental program
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Effect test

Embodiment 1

[0021] The discarded magnesia powder after heat treatment of oriented silicon steel was collected on site, and the chemical composition analysis showed that the composition and content (mass fraction) of the discarded magnesia powder were as follows: MgO, 92.3%; TiO 2 , 3.2%; SiO 2 , 1.6%; Al 2 o 3 , 1.5%; TFe0.3%, other impurities 0.8%, the particle size D50 of the waste magnesium oxide powder measured by a laser particle size analyzer is 18.6 μm; then the waste magnesium oxide powder, carbon powder, and asphalt powder are proportioned by weight 60-95%: 0-30%: 5-10%, the preferred weight ratio is 70%: 25%: 5%, add to the horizontal ribbon mixer and mix for 5-8 minutes, preferably 8 minutes, and discharge after mixing evenly , to obtain a mixed raw material, wherein the carbon powder in the raw material can be coke powder, coal powder, or a combination of one or more arbitrary ratios in graphite powder, and what selected in this example is coal powder;

[0022] Send the abo...

Embodiment 2

[0026] The discarded magnesia powder after heat treatment of oriented silicon steel was collected on site, and the chemical composition analysis showed that the composition and content (mass fraction) of the discarded magnesia powder were as follows: MgO, 94.3%; TiO 2 , 2.3%; SiO 2 , 1.2%; Al 2 o 3 , 0.9%; TFe0.3%, other impurities 0.7%, the particle size D50 of the waste magnesium oxide powder measured by a laser particle size analyzer is 17.4 μm; 60%: 30%: 10% is added to a horizontal ribbon mixer and mixed for 5-8 minutes, mixed evenly and discharged to obtain mixed raw materials;

[0027] Send the above mixed raw materials into a disc pelletizer and add water to form green pellets with a diameter of 10-15 mm. The amount of water added is 5% of the weight of the mixed raw materials; then send the green pellets into a baking oven at 200 ° C Keep warm for 1 hour to prepare magnesium carbon spheres, take them out and cool to room temperature naturally;

[0028] The cooled ...

Embodiment 3

[0031] The discarded magnesia powder after heat treatment of oriented silicon steel was collected on site, and the chemical composition analysis showed that the composition and content (mass fraction) of the discarded magnesia powder were as follows: MgO, 90.7%; TiO 2 , 5.1%; SiO 2 , 1.9%; Al 2 o 3 , 1.2%; TFe0.4%, other impurity 0.7%, measure the particle size D50 of this waste magnesium oxide powder by laser particle size analyzer to be 17.7 μ m; Then this waste magnesium oxide powder and graphite, and asphalt powder by weight ratio 80 %: 15%: 5% is added to a horizontal ribbon mixer and mixed for 5-8 minutes, mixed evenly and discharged to obtain mixed raw materials;

[0032] Send the above mixed raw materials into a disc pelletizer and add water to form green pellets with a diameter of 10-15mm. The amount of water added is 8% of the weight of the mixed raw materials; then send the green pellets into a baking oven at 200°C Keep warm for 1 hour to prepare magnesium carbon...

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Abstract

The invention discloses a resource utilization method of waste magnesia powder after treating oriented silicon steel. The resource utilization method comprises the following steps: (1) the waste magnesia powder after treating the oriented silicon steel is collected, and is evenly mixed with carbon powder and asphalt powder to obtain a mixed raw material by the following weight percentages: the waste magnesia powder is 60-95%, the carbon powder is 0-30%, and the asphalt powder is 5-10%; (2) the mixed raw material is prepared to green pellets with the diameter of 10-15 mm; and then the temperature of the green pellets is kept at 190-210 DEG C for 0.8-1.2 hours to prepare magnesium carbon pellets; and (3) the cooled magnesium carbon pellets are used as a slag splashing furnace protecting material. The resource utilization method uses the waste magnesia powder after treating the oriented silicon steel to replace the magnesium carbon pellets for the slag splashing furnace protection of a caustic-burned magnesia powder production converter; and the magnesium carbon pellets have high mechanical strength, can effectively enhance the viscosity of furnace slag, and can improve the slag splashing effect, so that the waste magnesia powder is effectively used, the stacking place is saved, the groundwater pollution is prevented, and the dual effects of environmental protection and economy are achieved.

Description

technical field [0001] The invention relates to solid waste recycling technology, in particular to a method for recycling waste magnesium oxide powder after heat treatment of oriented silicon steel. Background technique [0002] In the production process of oriented silicon steel, it is necessary to coat the surface of silicon steel strip with excessive silicon steel grade magnesium oxide and a small amount of other additives for secondary annealing. After this heat treatment, only part of silicon steel grade magnesium oxide reacts with silicon in oriented silicon steel and remains On the surface of the silicon steel strip, the bottom layer of magnesium silicate is formed, and the remaining unreacted magnesium oxide falls off from the surface of the silicon steel strip during the uncoiling process of the steel strip, and is collected in the hopper by a bag filter. It loses its original high reactivity and cannot be reused in the production of silicon steel. At present, it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C21C5/44C21C5/36
Inventor 康凌晨薛改凤黄建阳沈良田常晓熊家剑张垒方宏辉卢丽君刘瑛李丽坤刘尚超王丽娜付本全刘璞朱书景
Owner 武汉钢铁有限公司
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