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Method for removing iron and whitening for iron-containing attapulgite clay

A technology of attapulgite clay and attapulgite, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of affecting product quality, waste of medicine, reduction of reducibility, etc., to improve the effective utilization rate, Intensified collision, consistent effect

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can also effectively remove a small amount of iron, it is very easy to decompose and produce SO 2 and H 2 S and elemental sulfur reduce the reducibility. These side reactions not only waste medicine but also affect product quality, and easily produce harmful gases. In addition, if the bleached attapulgite clay is not washed in time, elemental sulfur is easy to deposit on the surface of attapulgite clay. Will cause the product to turn yellow

Method used

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  • Method for removing iron and whitening for iron-containing attapulgite clay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0012] Take Gansu attapulgite clay (content of more than 40%, whiteness of 28.9%) as an example, the mineral powder is passed through a 100-mesh sieve and activated at 300°C for 1 hour; it is acidified with 3% sulfuric acid for 4 hours to solidify The liquid ratio is 8:1, the temperature is 60°C, washing is performed after acidification, and the pH value is controlled at about 6-7. After separation with a centrifuge, it is dried at 105°C and then ground through an 80-100 mesh sieve.

[0013] Put the acidified mineral powder into a 10% concentration of ore slurry into the reaction vessel, add 0.5mol / L oxalic acid, 3% titanium trichloride, and put it in a microwave oven with a temperature of 50°C and a power of 800W. Liquid phase acidification and pyrolysis lasted for 10 minutes, and then acidified in a reflux device for 40 minutes, then centrifuged and washed, and finally at 105°C, the product was obtained with a whiteness of 65.9%.

Embodiment 1-2

[0015] Take Gansu attapulgite clay (with a content of 40% or more and a whiteness of 28.9%) as an example. The mineral powder is passed through a 100-mesh sieve and activated at 700°C for 1 hour; it is acidified with 8% sulfuric acid for 4 hours. The liquid ratio is 8:1, the temperature is 60°C, washing is performed after acidification, and the pH value is controlled at about 6-7. After separation with a centrifuge, it is dried at 105°C and then ground through an 80-100 mesh sieve.

[0016] Put the acidified mineral powder into a 30% concentration of ore slurry into the reaction vessel, add 1.5mol / L oxalic acid, 5% titanium trichloride, and put it in a microwave oven with a temperature of 85°C and a power of 600W. Liquid phase acidification pyrolysis lasts for 8 minutes, and then acidification in a reflux device for 40 minutes, then centrifugal filtration, washing, and finally at 105° C., the product is obtained with a brightness of 73.6%.

Embodiment 2-1

[0018] Take Gansu attapulgite clay (content of more than 40%, whiteness of 28.9%) as an example, the mineral powder is passed through a 100-mesh sieve and activated at 500°C for 1 hour; it is acidified with 3% sulfuric acid for 4 hours to solidify The liquid ratio is 8:1, the temperature is 60°C, washing is performed after acidification, and the pH value is controlled at about 6-7. After separation with a centrifuge, it is dried at 105°C, and then ground through an 80-100 mesh sieve.

[0019] The acidified mineral powder is prepared into a 10% concentration of ore slurry into the reaction vessel, 0.5mol / L oxalic acid, 3% titanium trichloride are added, and placed in a fixed reflux device, and the liquid is carried out at a temperature of 85°C. The phase reflux acidification pyrolysis lasts for 150 minutes, then centrifugal filtration and washing are performed, and finally the product is obtained at 105°C with a whiteness of 65.9%.

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Abstract

The invention relates to a method for removing iron and whitening for iron-containing attapulgite clay, comprising the following steps of: (1) selecting ore the content of attapulgite of which is more than 40%, crashing the attapulgite clay, and screening the attapulgite clay by a 100-mesh sieve, roasting and activating the attapulgite clay for 1 hour at the temperature of 300 to 700 DEG C; (2) acidulating the attapulgite clay after roasting treatment by 3 to 8% sulfuric acid , wherein the mass ratio of the sulfuric acid solution to the attapulgite clay is 8:1; placing the attapulgite clay in the sulfuric acid, stirring and soaking for 4 hours at the temperature of 60 DEG C, then washing for many times by utilizing distilled water, controlling the pH value to be 6.0 to 7.0, drying at the temperature of 105 DEG C, and then grinding, screening by a 80 to 120 mesh sieve; and (3) preparing the attapulgite clay after acidification to 10 to 30% ore slurry, placing the ore slurry into a reaction vessel, adding oxalic acid with the concentration of 0.5 to 1.5 mol / L and 3 to 5% titanium trichloride, heating reaction vessel for 8 to 150 minutes, acidulating for 40 to 50 minutes, and centrifuging, washing and filtering after reaction, and drying at the temperature of 105 DEG C to obtain the white attapulgite clay.

Description

Technical field [0001] The invention relates to a process for removing iron and whitening from attapulgite clay by applying oxalic acid-titanium trichloride under microwave, ultrasonic and heat reflux. Background technique [0002] Attapulgite clay is a natural non-metallic mineral clay with various uses. The iron content varies from region to region. The iron in attapulgite clay ore is mainly composed of structural iron and iron oxides and hydroxides. Exist in form (such as hematite, limonite, etc.). These iron minerals co-exist with attapulgite clay minerals or are embedded on the finer particles of attapulgite clay, and some are adsorbed on the surface of attapulgite crystal particles, which are chromogenic ions. The high iron content of attapulgite clay not only affects It improves its appearance, but also limits its application areas. At present, the decolorization methods of non-metallic minerals such as kaolin, zeolite, illite, etc. mainly use calcination, chemical metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/00C09C3/04C09C3/06C09C1/42
Inventor 王青宁俞树荣田静隽惠玲张飞龙李澜
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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