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Titanium gypsum slurry dehydration method

A technology of titanium gypsum and slurry, applied in the field of inorganic fine chemicals, can solve problems such as difficult dehydration and complex components

Inactive Publication Date: 2016-04-06
MAANSHAN HOYO MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the current problem of difficult dehydration of titanium gypsum slurry due to complex components, and proposes a rapid dehydration method for titanium gypsum slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Lime was introduced into 1000 mL of waste acid produced by Anhui Jinxing Titanium Dioxide Group Co., Ltd. to produce titanium dioxide under stirring conditions to adjust the pH value of the system to 4.7. Control the temperature of the system to 40°C, add inorganic salts to the system according to the mass percentage concentration of slurry: inorganic salts of 0.06%, and stir for 50 minutes at a rotation speed of 15 rpm. The dehydration performance of the treated phosphogypsum slurry was tested by the method mentioned in the invention patent "A method for judging the dehydration performance of different gypsum-20100263706.9". The time for the solids in the treated 50mL slurry to settle to 15mL in the graduated cylinder was 4.5min .

Embodiment 2

[0011] Example 2: Lime was introduced into 1000 mL of waste acid produced by Anhui Jinxing Titanium Dioxide Group Co., Ltd. to produce titanium dioxide to adjust the pH value of the system to 5.0 under stirring conditions. Control the temperature of the system at 60°C, add inorganic salts to the system according to the mass percentage concentration of slurry: inorganic salts 0.08%, and stir for 30 minutes at a rotation speed of 25 rpm. The dehydration performance of the treated phosphogypsum slurry was tested by the method mentioned in the invention patent "A method for judging the dehydration performance of different gypsum-20100263706.9". The time for the solids in the treated 50mL slurry to settle to 15mL in the graduated cylinder was 4.8min .

Embodiment 3

[0012] Example 3: Lime was introduced into 1000 mL of waste acid produced by Anhui Jinxing Titanium Dioxide Group Co., Ltd. to produce titanium dioxide under stirring conditions to adjust the pH value of the system to 5.2. Control the temperature of the system at 40°C, add inorganic salts to the system according to the mass percentage concentration of slurry: inorganic salts 0.05%, and stir for 40 minutes at a rotation speed of 60 rpm. The dehydration performance of the treated phosphogypsum slurry was tested by the method mentioned in the invention patent "A method for judging the dehydration performance of different gypsum-20100263706.9". The time for the solids in the treated 50mL slurry to settle to 15mL in the graduated cylinder was 5.2min .

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PUM

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Abstract

The invention relates to a titanium gypsum slurry dehydration method, and belongs to the field of inorganic fine chemical engineering. The method comprises the following steps: firstly, measuring an isoelectric point of a titanium gypsum slurry, and adding lime to adjust the pH value of the titanium gypsum slurry to be that of a position near the isoelectric point, so that solids in the titanium gypsum slurry can be easily gathered to form large particles which are beneficial to filtration; secondly, adding an appropriate inorganic salt to change the surface adsorption state of a calcium sulfate crystal, so as to form crystal particles which are beneficial to filtration. Through adoption of the method, the slurry dehydration and filtration performance can be improved, the water content in a filter cake can be effectively reduced, and then efficient dehydration of the titanium gypsum slurry can be realized.

Description

Technical field: [0001] The invention relates to a method for rapidly dehydrating titanium gypsum slurry, which belongs to the field of inorganic fine chemicals. Background technique: [0002] In the titanium dioxide industry, lime is often used to neutralize acidic wastewater. There are a large amount of sulfate ions in the above-mentioned acidic wastewater, so the reaction will eventually produce a large amount of calcium sulfate that is insoluble in water, which is commonly referred to as titanium gypsum. The main raw material of titanium dioxide is ilmenite, which often contains a certain proportion of Fe 2+ , Fe 3+ and Al 3+ ion. These ions in acidic wastewater will form flocculent amorphous colloidal precipitates during the neutralization process, making the resulting titanium gypsum slag very difficult to dehydrate. Titanium gypsum with low moisture content can be used as construction gypsum or cement raw material, while titanium gypsum with high moisture content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02
Inventor 俞海云尹传华向贤渊
Owner MAANSHAN HOYO MATERIAL TECH CO LTD
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