Method for preparing porous silicon adsorption material by using low-grade diatomite and porous silicon adsorption material

An adsorption material, diatomite technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as insufficient adsorption performance of volatile organic compounds, complicated preparation technology, and long process flow , to achieve the effect of high added value of products, simple preparation technology and short process flow

Inactive Publication Date: 2018-08-28
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0004] Chinese invention patent (CN103253951A) reported a preparation method of low-grade diatomite-based composite porous material, using low-grade diatomite, sugar filter mud and industrial waste residue as raw materials, through batching, ball milling, granulation, aging, molding , drying and sintering to make products, but this method has a long process flow, high energy consumption in the sintering process, and low added value for decorative building materials; Chinese invention patent CN102600818A reports a diatomite-loaded calcium oxide-based adsorption material , which uses the impregnation and precipitation method to load calcium oxide into the diatomite matrix, but this method has defects such as complicated process, and at the same time, the adsorption material is only for CO 2 The absorption of volatile organic compounds is insufficient; Chinese invention patent CNIO2641720A reports a preparation method of a modified diatomite composite adsorption material, which firstly combines diatomite with chitosan dissolved in ferric salt solution The sugar is mixed evenly; then ethanol is added, precipitated, filtered, washed and dried; finally, the dried product is placed in an ethanol solution of glutaraldehyde to undergo a cross-linking reaction, and the composite adsorption material is obtained after precipitation and drying, but the preparation technology of this method is complex and the process flow Longer and more expensive to produce

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  • Method for preparing porous silicon adsorption material by using low-grade diatomite and porous silicon adsorption material

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Embodiment 1

[0023] Embodiment 1: A kind of method that utilizes low-grade diatomite to prepare porous silicon adsorption material, it comprises the following steps: 1) preparation roasting diatomite; 2) alkali leaching desiliconization; 3) filtration, washing; 4) preparation high Active milk of lime; 5) make porous silicon adsorption material; wherein,

[0024] 1) Preparation of roasted diatomite: SiO 2 10Kg of low-grade diatomite with a mass percentage of 68% was crushed and ground, roasted at 250°C for 1.5h to remove organic matter, and then sieved to obtain roasted diatomite with a particle size greater than 325 meshes;

[0025] 2) Alkali leaching desiliconization: put the roasted diatomite and 20% sodium hydroxide solution in a reaction kettle, mechanically stir and mix, and carry out alkali leaching desiliconization reaction. The desiliconization reaction temperature is 80 ° C. The silicon reaction time is 3 hours, and the suspension slurry system is obtained; wherein, the SiO in th...

Embodiment 2

[0030] Embodiment 2: A kind of method that utilizes low-grade diatomite to prepare porous silicon adsorption material, it comprises the following steps: 1) preparation roasting diatomite; 2) alkali leaching desiliconization; 3) filtration, washing; 4) preparation high Active milk of lime; 5) make porous silicon adsorption material; wherein,

[0031] 1) Preparation of roasted diatomite: SiO 2 10Kg of low-grade diatomite with a content of 72%wt was crushed and ground, roasted at 300°C for 3 hours to remove organic matter, and then sieved to obtain roasted diatomite with a particle size greater than 325 mesh;

[0032] 2) Alkali leaching desiliconization: mix the roasted diatomite and 5% sodium hydroxide solution evenly, place it in a reaction kettle, stir it mechanically, and carry out alkali leaching desiliconization reaction. During the desilication reaction process Continuous mechanical stirring to keep the desilication reaction uniform. The desiliconization reaction tempera...

Embodiment 3

[0037] Embodiment 3: A kind of method that utilizes low-grade diatomite to prepare porous silicon adsorption material, it comprises the following steps: 1) preparation roasting diatomite; 2) alkali leaching desiliconization; 3) filtration, washing; 4) preparation high Active milk of lime; 5) make porous silicon adsorption material; wherein,

[0038] 1) Preparation of roasted diatomite: SiO 2 10Kg of low-grade diatomite with a content of 70%wt was crushed and ground, roasted at 200°C for 1 hour to remove organic matter, and then sieved to obtain roasted diatomite with a particle size greater than 325 mesh;

[0039] 2) Alkali leaching desiliconization: the roasted diatomite and the sodium hydroxide solution with a mass concentration of 30% are mixed evenly and then placed in a reaction kettle, mechanically stirred, and alkali leaching desilication reaction is carried out. During the desilication reaction process Continuous mechanical stirring to keep the desilication reaction u...

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Abstract

The invention discloses a method for preparing a porous silicon adsorption material by using low-grade diatomite and the porous silicon adsorption material. The method comprises the following steps: 1), preparing roasted diatomite; 2), performing alkaline leaching for desiliconization; 3), filtering and washing; 4), preparing high-activity lime milk; 5), preparing the porous silicon adsorption material. Raw materials are rich and wide in sources and low in cost, the adsorption material is prepared from the cheap limestone and the low-grade diatomite, a preparation technology is simple, the process flow is short, the comprehensive energy consumption is low, and the production cost is low; the porous silicon adsorption material prepared by the method provided by the invention has the bulk density of 0.20-0.32g/m<3>, has the specific surface area of 130-160m<2>/g, and has good performance in adsorbing formaldehyde, benzene, SO2 and volatile heavy metals.

Description

Technical field: [0001] The invention relates to a method for preparing a porous silicon adsorption material and the porous silicon adsorption material, in particular to a method for preparing a porous silicon adsorption material by using low-grade diatomite and the porous silicon adsorption material. Background technique: [0002] Diatomite is a biogenic siliceous sedimentary rock whose main chemical composition is SiO 2 , usually SiO 2 The higher the content of diatomaceous earth, the higher the precision level. my country's diatomite mineral reserves are relatively rich, but most of the diatomite mineral products are low-grade, with a silicon dioxide content of about 50%, and low-grade diatomite accounts for about 70% of the total reserves. Due to the single products of the enterprise, the filter aids, catalysts and other products have relatively high requirements on the quality grade of diatomite. As a result, during the diatomite mining process, only first-grade diato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/28B01J20/30
CPCB01J20/041B01J20/14B01J20/28054B01J20/28061
Inventor 张印民王晓燕张永锋邱新春
Owner INNER MONGOLIA UNIV OF TECH
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