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Compound of high-whiteness clay and preparation method thereof

A composite, high-brightness technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of large titanium dioxide loading, expensive complexing agents, and unsatisfactory whiteness improvement. Good shading effect, increase quality, enhance the effect of reactivity

Inactive Publication Date: 2013-07-17
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural clay minerals contain various impurities, and the existence of many color-developing elements (such as iron) makes the whiteness of clay low, so it cannot be obtained in high-end fields that require high whiteness, such as papermaking, paint, cosmetics, and polymer filling. Promotion
Chinese patent CN1884207A proposes a compound iron removal method of sodium oxalate and hydrochloric acid to improve the whiteness of attapulgite. This method has a lot of waste acid, which is easy to cause environmental pollution, and the whiteness of the product is not ideal.
However, this method needs to add a large amount of oxalic acid, tartaric acid or citric acid as a compounding agent, which will cause higher product costs and pollute the environment.
Chinese patent CN101423673A uses a complexing agent to remove coloring elements while loading titanium dioxide on the surface of the clay to obtain clay with higher whiteness. However, there are problems of excessive loading of titanium dioxide and expensive complexing agent, which makes the production cost too high
At present, this method has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Weigh 25 g of attapulgite with a whiteness of 65, place it in 100 g of deionized water, disperse it fully, prepare a slurry with a mass ratio of attapulgite to water of 0.25:1, and adjust the attapulgite slurry The temperature is 0°C, while stirring, add 10% TiCl to the slurry 4 Aqueous solution 62.5g, stir and acidify at 0°C for 24h; adjust the temperature of the feed liquid to 50°C, while stirring, add 5.9g of phosphoric acid aqueous solution with a mass percent content of 85%, constant temperature reaction for 0.5h; maintain the reaction temperature at 50°C , while stirring, add an aqueous solution of sodium metaaluminate with a mass percent content of 5%, when the pH value of the system rises to 6.0, stop adding the aqueous solution of sodium metaaluminate dropwise, and continue to keep warm for 10 hours; filter, and use deionized water Wash repeatedly to remove soluble salts, dry and pulverize to obtain a composite whose main component is attapulgite-tit...

Embodiment 2

[0027] Example 2: Weigh 20 g of attapulgite with a whiteness of 65, place it in 400 g of deionized water, disperse it fully, prepare a slurry with a mass ratio of attapulgite to water of 0.05:1, and adjust the attapulgite slurry The temperature is 100°C, while stirring, add TiCl with a mass percentage of 50% to the slurry 4 Aqueous solution 40g, stirred and acidified at 100°C for 1h; adjust the temperature of the feed liquid to 90°C, while stirring, add 240g of phosphoric acid aqueous solution with a mass percent content of 5%, and react at constant temperature for 6h; maintain the reaction temperature at 90°C, while stirring , while adding a potassium silicate aqueous solution with a mass percentage of 30%, when the pH value of the system rises to 9.0, stop adding the potassium silicate aqueous solution dropwise, and continue the heat preservation reaction for 0.5h; filter, and repeatedly wash with deionized water to remove soluble salt, dried, and pulverized to obtain a comp...

Embodiment 3

[0028] Embodiment 3: Weigh 24g of attapulgite with a whiteness of 65, place it in 240g of deionized water, fully disperse it, and prepare a slurry with a mass ratio of attapulgite to water of 0.1:1, and adjust the attapulgite slurry The temperature is 80°C, while stirring, add TiCl with a mass percentage of 30% to the slurry 4 Aqueous solution 40g, stirred and acidified at 80°C for 4h; at 80°C, while stirring, added 40g of phosphoric acid aqueous solution with a mass percent content of 21%, and reacted at constant temperature for 3h; maintained the reaction temperature at 80°C, while stirring, added mass 20% sodium silicate aqueous solution, when the pH value of the system rises to 7.5, stop adding the sodium silicate aqueous solution dropwise, and continue to keep warm for 5 hours; filter, wash repeatedly with deionized water to remove soluble salts, dry, and pulverize , to obtain a composite whose main component is attapulgite-titanium phosphate-silicon dioxide, and the meas...

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Abstract

The invention discloses a compound of high-whiteness clay and a preparation method thereof. The preparation method is as follows: firstly adding titanium tetrachloride solution into clay slurry to dissolve out the developing elements in the clay in the form of ions; secondly, adding phosphoric acid water solution to load the phosphate precipitation and titanium phosphate precipitation of the developing elements on the surface of the clay; and finally adding silicate solution or aluminate solution to ensure generated silica or alumina to compound the clay once again to obtain the high-whiteness clay. The invention has low cost, simple operation and less environmental pollution.

Description

technical field [0001] The invention relates to a compound of high-whiteness clay and a preparation method thereof, in particular to a method for synergistically whitening clay with phosphate, titanium phosphate and silicon dioxide or aluminum oxide. Background technique [0002] Clay is a non-metallic mineral with large reserves and wide application range. However, natural clay minerals contain various impurities, and the existence of many color-developing elements (such as iron) makes the whiteness of clay low, so it cannot be obtained in high-end fields that require high whiteness, such as papermaking, paint, cosmetics, and polymer filling. Promotion and use. Chinese patent CN1884207A proposes a compound iron removal method of sodium oxalate and hydrochloric acid to improve the whiteness of attapulgite. This method has a lot of waste acid, which is easy to cause environmental pollution, and the whiteness of the product is not ideal. Chinese patent CN100529255C proposes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C09C3/06
Inventor 姚超曾永斌陈天虎杜郢吴凤芹魏科年
Owner JIANGSU POLYTECHNIC UNIVERSITY
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