Method for removing free carbon in micro-silica fume by fluidized bed method

A technology of fluidized bed method and micro-silica fume, which is applied in the direction of silicon oxide and silicon dioxide, can solve the problems of time-consuming, costly, and great influence on production capacity, and achieve the goal of reducing operation time and labor intensity and being easy to operate Effect

Inactive Publication Date: 2012-11-21
铁生年
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the field of purification of silica fume, metal oxide impurities in silica fume are mainly removed by pickling, but there are few patented technologies and research reports on removing free carbon in silica fume
When the traditional high-temperature sintering furnace is used for decarburization, because the temperature is too high, the micro-silicon powder is easy to sinter into agglomerates, which not only has a great impact on the production capacity of the micro-silicon powder purification, but also takes time, effort and money.

Method used

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  • Method for removing free carbon in micro-silica fume by fluidized bed method

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Experimental program
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Effect test

Embodiment 1

[0011] Before opening the fluidized bed, carefully check whether the opening and closing of the switches and valves are correct; weigh 18g of micro-silicon powder raw material and place it in the fluidized bed reactor; control the amount of oxygen entering the reactor by adjusting the gas flow meter, so that the micro-silicon powder Reach the best fluidization state; turn on the heater, adjust the reaction temperature to 500°C, and the reaction time is 2.5 hours; after the reaction is completed, turn off the heating device and continue to feed oxygen, and stop feeding oxygen when the temperature drops to room temperature. The material taken out is the micro-silicon powder with free carbon removed.

Embodiment 2

[0013] Before opening the fluidized bed, carefully check whether the opening and closing of the switches and valves are correct; weigh 20g of micro-silicon powder raw material and place it in the fluidized bed reactor; control the amount of oxygen entering the reactor by adjusting the gas flow meter, so that the micro-silicon powder Reach the best fluidization state; turn on the heater, adjust the reaction temperature to 700°C, and the reaction time is 3.0h; after the reaction is completed, turn off the heating device and continue to feed oxygen, and stop feeding oxygen when the temperature drops to room temperature. The material taken out is the micro-silicon powder with free carbon removed.

Embodiment 3

[0015] Before opening the fluidized bed, carefully check whether the opening and closing of the switches and valves are correct; weigh 22g of micro-silicon powder raw material and place it in the fluidized bed reactor; control the amount of air entering the reactor by adjusting the gas flow meter to make the micro-silicon powder Reach the best fluidization state; turn on the heater, adjust the reaction temperature to 900°C, and the reaction time to 0.5h; after the reaction is completed, turn off the heating device and continue to supply air, and stop supplying air when the temperature drops to room temperature. The material taken out is the micro-silicon powder with free carbon removed.

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Abstract

The invention discloses a method for removing free carbon in micro-silica fume by a fluidized bed method. The method comprises the steps of: taking and putting a certain quantity of micro-silica fume material into a fluidized bed reactor, and leading in reaction atmosphere to react under an optimal fluidized state so as to remove the free carbon in the micro-silica fume. According to the method for removing the free carbon in the micro-silica fume by the fluidized bed method, the free carbon in the micro-silica fume can be effectively removed; the content range of the free carbon in the micro-silica fume is 2-5% (mass fraction), and the content of the free carbon in the processed micro-silica fume is smaller than 0.05% (mass fraction), thereby improving the use value of the micro-silica fume. A continuous operation of purification operation of the micro-silica fume can be achieved; the carbon removing process is simple in operation and the method has a great market prospect.

Description

technical field [0001] The present invention designs a purification process of micro-silicon powder, specifically a method for removing free carbon in micro-silicon powder through a fluidized bed device. Background technique [0002] Micro-silica fume is a ferroalloy smelting ferrosilicon and industrial silicon (metal silicon), a large amount of highly volatile silicon dioxide and silicon gas are produced in the submerged electric furnace. After the gas is discharged, it is rapidly oxidized and condensed with the air and precipitated. It is an ultrafine amorphous powder recovered by dust removal and environmental protection equipment. Its main substance is silica, which is a by-product of large-scale industrial smelting. Silica fume mainly contains some metal oxides and free carbon impurities. Their existence seriously affects the purity of silicon dioxide in micro-silica powder, and also reduces the use value of micro-silica powder. Therefore, it is of great significance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 铁生年姜子炎汪长安
Owner 铁生年
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