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Preparation method for desilication modified-attapulgite adsorbent

A technology for modifying attapulgite and attapulgite, applied in the field of papermaking, can solve the problems of low grade of attapulgite, poor adsorption performance, and many impurities, and achieve the effects of reducing impurities, improving performance, and simple operation method

Inactive Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the natural attapulgite has low grade, more impurities, small channels, and poor adsorption performance. These weaknesses limit the application of attapulgite.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add attapulgite adsorbent that has been treated with hydrochloric acid with a solid-to-liquid ratio of 1:5 and a concentration of 12% to 100ml of the clarified green liquor, and calcined at a high temperature of 250°C, shake at 25°C for 2 hours at a speed of 150r / min , centrifuge to take 10ml of filtrate and add deionized water, 0.15mol / L H 2 SO 4 and 5ml of 75g / L ammonium molybdate, shake well, add 100g / L oxalic acid and 10g / L SnCl after 10min at room temperature 2 5ml each, and then 45°C constant temperature water bath for 15min, the silicon adsorption removal rate was measured to be 87%.

Embodiment 2

[0023] Add attapulgite adsorbent that has been treated with hydrochloric acid with a solid-to-liquid ratio of 1:5 and a concentration of 8% to 100ml of the clarified green liquor, and calcined at a high temperature of 250°C, shake at a speed of 150r / min at 25°C for 2h , centrifuge to take 10ml of filtrate and add deionized water, 0.15mol / L H 2 SO 4 and 5ml of 75g / L ammonium molybdate, shake well, add 100g / L oxalic acid and 10g / L SnCl after 10min at room temperature 2 5ml each, and then 45°C constant temperature water bath for 15min, the silicon adsorption removal rate was measured to be 94%.

Embodiment 3

[0025] Add attapulgite adsorbent that has been treated with hydrochloric acid with a solid-to-liquid ratio of 1:5 and a concentration of 8% to 100ml of the clarified green liquor, and calcined at a high temperature of 200°C, shake at 25°C for 2 hours at a speed of 150r / min , centrifuge to take 10ml of filtrate and add deionized water, 0.15mol / L H 2 SO 4 and 5ml of 75g / L ammonium molybdate, shake well, add 100g / L oxalic acid and 10g / L SnCl after 10min at room temperature 2 5ml each, and then 15min in a constant temperature water bath at 45°C, the silicon adsorption removal rate was measured to be 90%.

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PUM

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Abstract

The invention discloses a p reparation method for a desilication modified-attapulgite adsorbent. According to the invention, cheap attapulgite is used as a raw material and treated by hydrochloric acid with certain concentration and solid-liquid ratio, and then high temperature treatment is carried out so as to prepare modified attapulgite with good soluble-silicon adsorption performance. The modified attapulgite prepared in the invention has good adsorption and removal capabilities to soluble silicon in green liquor of papermaking waste water, is cheap, can perfectly reduce and mitigate difficulty in alkali recovery in the paper-making industry and produces good economic effects.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a preparation method of a modified attapulgite adsorbent for removing silicon. Background technique [0002] Non-wood fiber papermaking raw materials are an important renewable fiber raw material. Due to the limitation of resources at this stage in my country, the paper industry mainly uses non-wood raw materials, such as bamboo and wheat straw. However, due to the special reasons of the non-wood fiber raw materials themselves, the cellulose content is lower than that of wood, the hemicellulose content is higher than that of wood, there are more miscellaneous cells, and the ash content is higher, and silicon dioxide accounts for more than 60% of ash. Therefore, the problem of "silicon interference" in the alkali recovery process of the paper industry is serious. At present, there are many methods to alleviate the problem of "silicon interference", such as carbon dioxide meth...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30B01D15/00
Inventor 莫立焕谈金强李军王聪聪徐峻
Owner SOUTH CHINA UNIV OF TECH
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