Solid-liquid separation method for superfine powder slurry

A technology for ultra-fine powder and solid-liquid separation, applied in separation methods, precipitation separation, chemical instruments and methods, etc., can solve the problems of difficult solid-liquid separation, large surface energy, etc., and achieve the goal of reducing drying costs and good dispersibility Effect

Inactive Publication Date: 2011-09-28
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When preparing ultra-fine powder materials and nano-powder materials, the current popular methods are aqueous phase chemical reduction method, sol-gel method, etc. In the post-production process of such methods, solid-liquid separation procedures will be encountered , due to the small particle size and large surface energy of the powder particles, the powder particles will be suspended in the liquid, resulting in difficulty in solid-liquid separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw material is a fused silica suspension with water as the medium, a solid content of 50%, and a median particle size of 1 micron. The suspension does not settle, and fine powder will flow out during press filtration, making it difficult to achieve solid-liquid separation. The suspension was frozen at -20°C for 10 hours to form a mixture of completely solidified ice and fused silica, and then melted at room temperature (20°C). After melting, the agglomerates of fused silica powder particles settled and precipitated clear water. , Pour out the water to achieve solid-liquid separation, and the dried fused silica powder has good dispersibility.

Embodiment 2

[0024] The raw material is silica sol with water as the medium, solid content of 30%, and median particle size of 20 nanometers. It is difficult to achieve solid-liquid separation by centrifugation and pressure filtration. The silica sol was frozen at -20°C for 10 hours to form a mixture of completely solidified ice and silica sol, and then melted at room temperature (20°C). It was still difficult to settle at this time, and then frozen at -20°C for 10 hours, and then Melt at room temperature (20°C). After melting, the agglomerates of silica sol powder particles settle and precipitate clear water. Pour the water out to achieve solid-liquid separation. The dried silica sol powder has good dispersibility. .

Embodiment 3

[0026] The raw material is a kaolin suspension with water as the medium, a solid content of 50%, and a median particle size of 1 micron. The suspension does not settle, and fine powder will flow out during press filtration, making it difficult to achieve solid-liquid separation. The suspension was frozen at -20°C for 10 hours to form a mixture of completely solidified ice and kaolin, and then melted at room temperature (20°C). After melting, the aggregates of kaolin powder particles settled and clear water was precipitated. The water is poured out to achieve solid-liquid separation, and the kaolin after drying has good dispersibility.

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PUM

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Abstract

The invention discloses a solid-liquid separation method for superfine powder slurry and relates to the technical field of solid-liquid separation. The solid-liquid separation method comprises the following steps of: freezing the powder slurry at the temperature of between 50 DEG C below zero and 0 DEG C until the powder slurry is completely frozen and in a solid state; warming and melting the frozen slurry, standing and settling; and directly pouring out supernatant or discharging the supernatant through a valve on a container, namely solid-liquid separation is realized. The method has the advantages that: physical aggregates are formed in the process of freezing powder particles, the property and surface appearance of the powder are not changed, and particle size distribution of the powder can be kept invariable after sedimentation; the drying cost of powder materials can be greatly reduced due to solid-liquid separation; and the powder materials prepared by the separation method have higher dispersibility.

Description

Technical field: [0001] The invention relates to the technical field of solid-liquid separation, in particular to a method for solid-liquid separation of ultrafine powder slurry. Background technique: [0002] When preparing ultra-fine powder materials and nano-powder materials, the current popular methods are aqueous phase chemical reduction method, sol-gel method, etc. In the post-production process of such methods, solid-liquid separation procedures will be encountered , due to the small particle size and large surface energy of the powder particles, the powder particles will be suspended in the liquid, resulting in difficulty in solid-liquid separation. [0003] In view of the above defects, it is necessary to provide a solid-liquid separation method in the process of preparing ultrafine powder or nanopowder materials that can solve the above technical problems. Invention content: [0004] The technical problem to be solved by the present invention is to provide a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/00
Inventor 蒋学鑫王亚娟
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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