Method and device for purifying and activating industrial silicon microsilica fume

A technology of micro-silica fume and industrial silicon, applied in silicate, silicon oxide, silicon dioxide and other directions, can solve the problems of products with peculiar smell, difficult to filter, low concentration of water glass liquid, etc. Avoid the effect of influence

Active Publication Date: 2018-05-11
CHANGJI JISHENG NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the end, due to the low concentration of the reacted water glass liquid, it is difficult to filter and cannot be successfully industrialized, and the product has a peculiar smell, and the color is dark yellow or brownish red, which also seriously affects the product quality and subsequent application of water glass.
[0006] Therefore, there is no application or successful report of the industrialization of this method at present.

Method used

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  • Method and device for purifying and activating industrial silicon microsilica fume
  • Method and device for purifying and activating industrial silicon microsilica fume
  • Method and device for purifying and activating industrial silicon microsilica fume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The gray-black micron-sized silicon powder (185°C) is separated and collected from the industrial silicon smelting flue gas by a bag filter; the micro silicon powder is preheated to 580°C by a heat pipe heat exchanger; then the preheated micro silicon The powder is sent to the electric heating high-temperature rotary roasting unit with three-stage temperature of 850℃, 880℃ and 920℃, and oxygen-enriched air is introduced. The number of revolutions of the rotary roaster and the length of the rotary roaster are adjusted to keep the micro silicon powder in the furnace. Mid-radial turning and axial movement to ensure that the micro-silica powder is in full contact with oxygen-enriched air, and control the time from entering the rotary roasting furnace to discharging the micro-silica powder to 23 minutes; after high-temperature roasting under dynamic conditions, the material is discharged and enters the air cooler Cooling; and then separated by bag filter to obtain sample 1 of ...

Embodiment 2

[0050] The gray-black micron-sized silicon powder (194℃) is separated and collected from the industrial silicon smelting flue gas by the bag filter; the micro silicon powder is preheated to 600℃ by the heat pipe heat exchanger; and then the preheated micro silicon The powder is fed into a natural gas-heated high-temperature rotary roaster at 880℃; pure oxygen is fed into the rotary roaster and the rotation of the rotary roaster is adjusted and the length of the rotary roaster is controlled to keep the micro-silica powder turning radially and moving axially in the furnace. Ensure that the micro-silica powder is in full contact with the oxygen-enriched air, and control the time from entering the rotary roasting furnace to discharging the micro-silica powder to 28 minutes; after being roasted at a dynamic high temperature, it is discharged and cooled in the air cooler; and then separated by a bag filter Removal of impurities and activated micro-silica fume sample 2. The entire pro...

Embodiment 3

[0052] The gray-black micron-size micro-silica powder (202℃) separated and collected from the industrial silicon smelting flue gas by a bag filter; preheat the micro-silica powder to 650℃ through a heat pipe heat exchanger; then the preheated micro-silicon The powder is fed into a natural gas-heated high-temperature rotary roasting furnace at 950℃; oxygen-enriched air is introduced, and by adjusting the number of revolutions of the rotary roasting unit and controlling the length of the rotary roasting furnace, the micro-silica powder is kept radially turned and axially turned in the furnace Move to ensure that the micro-silica powder is in full contact with oxygen-enriched air, and control the time from entering the rotary roasting furnace to discharging the micro-silica powder to be 20 minutes; after roasting under dynamic high temperature, it is discharged and enters the air cooler for cooling; and then passes through the bag filter Separate and obtain sample 3 of impurity rem...

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Abstract

The invention discloses a method and a device for purifying and activating industrial silicon microsilica fume. The method comprises the following steps: preheating microsilica fume separated, collected and obtained from industrial silicon smelting fume to 560 to 650 DEG C, carrying out high-temperature roasting on the preheated microsilica fume in an oxygen-enriched atmosphere at 720 to 1100 DEGC in a static or dynamic state, discharging after roasting for 15 to 90 minutes, cooling and separating, thus obtaining purified and activated microsilica fume. The device is used for realizing purification and activation of the industrial silicon microsilica fume, and comprises a first dedusting unit, a preheating heat exchange unit, a roasting unit, a cooling heat exchange unit, a second dedusting unit, a microsilica fume storage unit and an air heating unit. According to the method and the device, disclosed by the invention, influence of organic volatiles such as coal tar and carbon in themicrosilica fume on production and quality of follow-up products can be avoided by removing the organic volatiles such as the coal tar and the carbon in the microsilica fume, and reaction and filter of the follow-up products are facilitated by regulating the density and the granularity of the microsilica fume under the condition that the reaction activity of the microsilica fume is ensured, so that industrial production of follow-up sodium silicate products is realized.

Description

Technical field [0001] The invention belongs to the technical field of solid waste recycling, and more specifically, relates to a method and device for removing impurities and activating industrial silicon microsilica powder. Background technique [0002] Micro silicon powder is industrial fine dust containing silicon produced by SiO and Si gas generated in the mine thermoelectric furnace during the production process of industrial silicon or ferrosilicon alloy, and is rapidly oxidized and cooled by air. It is a micron-level fine powder and has dioxide The silicon content is high, and it is harmful to the body after being inhaled, which is a solid waste. With the strengthening of the country's environmental protection efforts, the micro-silica fume in the flue gas of industrial silicon production enterprises has begun to be collected through environmentally-friendly bag dust removal equipment to meet the emission standards. [0003] The micro-silica powder collected from industria...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B33/32
CPCC01B33/18C01B33/32C01P2004/61C01P2006/10C01P2006/80Y02P20/129
Inventor 徐伟陈建材朱尔明
Owner CHANGJI JISHENG NEW BUILDING MATERIALS CO LTD
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