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Carbon-silicon carbide porous filter for purifying air and preparation method thereof

A porous filter and air purification technology, which is applied in the direction of chemical instruments and methods, filtration separation, separation methods, etc., can solve the problems of inability to filter fine particles, poor dust filtration effect, and low filtration efficiency, so as to improve the level of filtration accuracy, Small air resistance, promotes the effect of complete removal

Active Publication Date: 2020-02-21
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the air purifier filter element prepared by this technology has the filtering function of formaldehyde and dust at the same time, it has the problem of low filtering efficiency.
The filter element only uses carbon crystal particles to adsorb formaldehyde gas, but does not decompose formaldehyde gas; when the formaldehyde concentration in carbon crystal particles is higher than the formaldehyde concentration in indoor air, the formaldehyde in carbon crystal particles will be released into the air, resulting in Secondary Formaldehyde Pollution of Indoor Air
In addition, this technology uses multi-layer gauze to only intercept millimeter-level and micron-level dust in the air, and cannot filter submicron and nanometer-level fine particles, resulting in poor dust filtering effect of the filter element

Method used

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  • Carbon-silicon carbide porous filter for purifying air and preparation method thereof

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preparation example Construction

[0028] The preparation method of the activated carbon is: under the condition of 600-800 DEG C and an inert atmosphere, the microcrystalline graphite is subjected to microwave treatment for 1-5 minutes to obtain the activated carbon; the average particle diameter of the activated carbon is ≤5 μm.

[0029] The average particle size of the elemental silicon is ≤15 μm; the Si content of the elemental silicon is ≥98wt%.

[0030] The average particle size of the microsilica powder is ≤0.5 μm; the SiO of the microsilica powder 2 Content ≥ 97wt%.

[0031] The open porosity of the polyurethane sponge is more than or equal to 98%.

Embodiment 1

[0033] A carbon-silicon carbide porous filter for air purification and a preparation method thereof. The steps of the preparation method are:

[0034] Step 1: Take 60-65wt% coconut shell charcoal powder, 12-15wt% activated carbon powder, 10-18wt% elemental silicon and 6-8wt% silicon micropowder as raw materials, mix evenly to obtain the mixture; Add 3-5wt% ferric chloride powder, 0.3-0.6wt% carboxymethyl cellulose and 30-35wt% water to the mixture, and stir for 45-60 minutes to obtain a slurry.

[0035] Step 2. Immerse the polyurethane sponge in the slurry for 5-10 minutes, extrude it with counter-rollers, dry it at room temperature, and dry it at 90-110°C for 24-48 hours to obtain a carbon-silicon carbide porous filter blank body.

[0036] Step 3. Place the carbon-silicon carbide porous filter body in an atmosphere sintering furnace. In the carbon-burying atmosphere: firstly raise the temperature to 200-220°C at a rate of 0.5-2°C / min, and then heat up to 200-220°C at a rate...

Embodiment 2

[0040] A carbon-silicon carbide porous filter for air purification and a preparation method thereof. The steps of the preparation method are:

[0041] Step 1. Take 65-70wt% coconut shell charcoal powder, 10-13wt% activated carbon powder, 17-25wt% elemental silicon and 5-7wt% silicon micropowder as raw materials, and mix them evenly to obtain the mixture; Add 1-3wt% ferric chloride powder, 0.1-0.3wt% carboxymethyl cellulose and 20-25wt% water to the mixture, and stir for 45-60 minutes to obtain a slurry.

[0042] Step 2. Immerse the polyurethane sponge in the slurry for 5-10 minutes, extrude it with counter-rollers, dry it at room temperature, and dry it at 90-110°C for 24-48 hours to obtain a carbon-silicon carbide porous filter blank body.

[0043] Step 3. Place the carbon-silicon carbide porous filter body in an atmosphere sintering furnace. In the carbon-burying atmosphere: firstly raise the temperature to 200-220°C at a rate of 0.5-2°C / min, and then heat up to 200-220°C ...

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Abstract

The invention discloses a carbon-silicon carbide porous filter for purifying the air and a preparation method thereof. The preparation method comprises the following steps: by taking 60-70wt% of coconut shell charcoal powder, 10-15wt% of activated carbon powder, 10-25wt% of monatomic silicon and 5-8wt% of silica powder as raw materials, mixing to obtain a mixture; and adding ferric chloride powderaccounting for 1-5wt% of the raw materials, carboxymethyl cellulose accounting for 0.1-0.6wt% of the raw materials and water accounting for 20-35wt% of the raw materials into the mixture, and stirring to obtain a slurry; immersing polyurethane sponge into the slurry; and taking out the polyurethane sponge, carrying out extrusion molding or slurry throwing molding by using double rollers, drying,baking, putting into an obtained product into an atmosphere sintering furnace, sequentially heating to 200-220 DEG C, 600-650 DEG C and 1000-1200 DEG C at three rates in a carbon burying atmosphere oran inert atmosphere, and cooling along with the furnace to obtain the carbon-silicon carbide porous filter for purifying the air. The process is simple, and the prepared carbon-silicon carbide porousfilter for purifying air is small in air resistance, high in PM2.5 filtering efficiency and high in formaldehyde and VOC gas removal rate.

Description

technical field [0001] The invention belongs to the technical field of porous filters. In particular, it relates to a carbon-silicon carbide porous filter for air purification and a preparation method thereof. Background technique [0002] With the development of the decoration industry, indoor air pollution has become one of the environmental issues that are widely concerned in various countries. Formaldehyde and benzene-based volatile organic compounds, as common household gas pollutants, are genotoxic and carcinogenic, and seriously endanger human health. In addition, the tiny particles in the indoor air also seriously threaten the health of the body. For example, the fine particles (PM2.5) in the air can seriously damage the human respiratory system and cardiovascular system. Therefore, in order to create a comfortable and healthy living environment, indoor formaldehyde and benzene-based volatile organic compounds must be removed, and indoor PM2.5 must also be purified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622C04B38/06B01D39/20B01D53/44B01D53/72B01D53/81
CPCB01D39/2065B01D53/44B01D53/72B01D53/81B01D2257/708C04B35/532C04B35/622C04B38/062C04B2235/327C04B2235/422C04B2235/428C04B2235/5436C04B2235/5445C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/94C04B2235/95C04B2235/96Y02A50/20
Inventor 梁雄李亚伟万方豪桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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