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Filter aid for clay processing

A filter aid, kaolin technology, applied in the field of high molecular weight polyacrylic acid as a filter aid, can solve the problems of not being able to achieve low viscosity, difficult to obtain slurry, etc., and achieve the effect of increasing the solid content

Inactive Publication Date: 2000-07-26
ENGELHARD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The final product cannot achieve low viscosity, and it is difficult to obtain a slurry with a solid content higher than 60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Samples were taken from delaminated coarse hydrous clays with 65-75% particle size TM The polymers were subjected to two sets of test runs.

[0024] In the first group, the polymer treatment effect was tested. Additionally, the effect of applying shear to the slurry under high shear conditions was tested. This set of tests performed simulated operations such as pumping. A second set of experiments determined the aging effects of the polymer-treated slurries.

[0025] Tables 1 and 2 show the results of these tests. It can be seen that treatment with 2 lbs / ton of polymer increases the filtration rate by more than 30%. It should be noted that there is no negative impact on filter cake solids. After the filter cake was redispersed to a 67% solids slurry, the rheological data showed an unexpected improvement in both the Brookfield viscosity and the Hercuies viscosity (high shear and low shear) of the aqueous clay solution. Lower Brookfield viscosities are ideal for impr...

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PUM

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Abstract

A process for filtering kaolin clay slurries in the presence of a filter aid which increases the percent solids in the filter cake, decreases the product solids in the waste filtrate, increases the rate of filtration, and yet does not interfere with redispersal of the filter cake after filtration. The process utilizes high molecular weight, highly anionic polyacrylic acid homopolymers or copolymers, or water soluble salts thereof, as filter aids for thickening and dewatering kaolin clay slurries. The flocculated clay may be redispersed after the separation process by normal means, such as the addition of low molecular weight anionic polymers with mixing.

Description

[0001] The present application is a continuation-in-part of USSN-08 / 857,650 filed May 16, 1997, the disclosure of which is incorporated herein by reference. field of invention [0002] This invention relates to filter aids for use in the filtration of pulverized mineral mixtures into their individual components, and in particular to the use of high molecular weight polyacrylic acid as a filter aid in the separation of kaolin slurries. More particularly, the present invention relates to a class of filter aids which function as flocculants under the acidic conditions of filtration operations and which are harmless when present in dispersed clay slurries with a pH close to neutral or alkaline . Background of the invention [0003] Flocculants are a class of agents that, when added to a solid suspension, cause the solids to agglomerate into large particles, allowing them to settle more quickly and efficiently than in an untreated suspension. Polymeric water-soluble flocculants ...

Claims

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Application Information

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IPC IPC(8): C02F1/54C02F1/56
CPCC02F1/54C02F1/56
Inventor M·J·威利斯S·贝尔R·H·扬
Owner ENGELHARD CORP