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Method for producing activated clay by circulating use of waste hydrochloric acid

A technology of activated clay and hydrochloric acid, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of poor product quality, high consumption of hydrochloric acid, and difficult wastewater treatment, and achieve whiteness increase, iron and calcium content Reduced effect

Inactive Publication Date: 2009-09-02
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the price of sulfuric acid is lower and sulfuric acid wastewater is easier to treat, there are many calcium and iron residues in the product, and the product quality is not as good as the hydrochloric acid method
Chinese Patent [Application (Patent) No.] CN200310120043.5 discloses a production method of activated clay, which is produced by the hydrochloric acid method, and the product can be used for decolorization and catalyst, but because the waste acid cycle is not used, the consumption of hydrochloric acid is large, and waste water treatment difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1 part of bentonite with a particle size of 0.1-5 cm and 2 parts of recovered waste acid obtained by the first filtration of the subsequent process are subjected to wet grinding to obtain a raw material suspension with a particle size of 100-200 mesh; the raw material suspension is put into a stirring reactor, Adding concentration is 36~37% hydrochloric acid to make the hydrochloric acid content of the suspension reach 12%, react under stirring at 80 ℃ for 5 hours to obtain the reaction suspension; filter the reaction suspension for the first time with a plate-and-frame filter press to obtain recovered waste Acid and filter cake, recover waste acid and return to step 1; filter cake is washed with water, dried and crushed to obtain activated clay with activity degree greater than 260 and rapeseed oil decolorization rate greater than 90%.

Embodiment 2

[0015] 1 part of bentonite with a particle size of 0.1 to 5 cm and 2.5 parts of recovered waste acid obtained through the first filtration of the subsequent process are subjected to wet grinding to obtain a raw material suspension with a particle size of 100 to 200 mesh; the raw material suspension is put into a stirring reactor, Adding concentration is 36~37% hydrochloric acid to make the hydrochloric acid content of suspension reach 14%, react under stirring at 85 ℃ for 4 hours to obtain reaction suspension; filter reaction suspension for the first time with plate and frame filter press, obtain recovery waste Acid and filter cake, recover waste acid and return to step 1; filter cake is washed with water, dried and pulverized to obtain activated clay with activity degree greater than 250 and rapeseed oil decolorization rate greater than 93%.

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Abstract

The invention relates to a method for preparing activated clay. The method is characterized in that bentonite and hydrochloric acid are taken as raw materials. The method is as follows: bentonite ore and the waste hydrochloric acid returned from latter processes are ground by a wet method to obtain suspension liquid, concentrated hydrochloric acid is added to the suspension liquid in an agitation reactor to enable the concentration of the suspension liquid acid to reach 10-15 percent, the concentrated hydrochloric acid and the suspension liquid react for 3-6h at the temperature ranging from 75 DEG C to 100 DEG C to obtain reaction suspension liquid, the reaction suspension liquid is filtered to obtain waste hydrochloric acid and filter cakes, the waste hydrochloric acid is returned for recycle, and the activated clay with the activity degree being more than 240 and the rape oil color-removing ratio being more than 90 percent is obtained by filtering and drying the filter cakes. In the method, a waste hydrochloric acid return process is adopted in the activated clay preparing process, thus the use amount of the hydrochloric acid is reduced by 60 percent and the discharge amount of the waste hydrochloric acid is reduced by 80 percent; and the quality of the obtained activated clay is better than that of the activated clay prepared by a sulfuric acid process.

Description

technical field [0001] The invention belongs to the technical field of bentonite modification, and in particular relates to a method for producing activated clay by recycling waste hydrochloric acid. Background technique [0002] Activated clay is a modified bentonite obtained by activating bentonite with inorganic acid. The acid activation of bentonite can increase the acidic active center inside the bentonite and make it have decolorization and catalytic functions. At present, the inorganic acids used in the production of activated clay mainly include sulfuric acid and hydrochloric acid. For example, the Chinese patent [application (patent) number] CN99105673.6 discloses a preparation method for wet production of activated clay, which uses sulfuric acid waste acid cycle The process of producing activated clay effectively solves the problem of wastewater polluting the environment. Although the price of sulfuric acid is lower and sulfuric acid wastewater is easier to treat,...

Claims

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Application Information

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IPC IPC(8): C01B33/40B01J20/10
Inventor 童张法韦藤幼樊欣梅张德虎黄彪潘远凤
Owner GUANGXI UNIV
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