Preparation method of hydroxy-calcium bentonite for treating phosphorus-containing wastewater

A technology of bentonite and calcium hydroxide, applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of high price of zirconia, limited application of loaded zirconia bentonite, etc. content, good water purification effect, effective treatment effect

Inactive Publication Date: 2019-01-22
WUHU PENGLEI NEW MATERIAL
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AI Technical Summary

Problems solved by technology

However, the price of zirconia is relatively high, which limits the application of loaded zirconia bentonite

Method used

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Experimental program
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Embodiment Construction

[0015] A kind of preparation method of the hydroxycalcium bentonite that is used for treating phosphorus-containing wastewater comprises the following specific steps:

[0016] (1) Add a certain quality of low-grade bentonite raw soil to an appropriate amount of deionized water to prepare a suspension with a concentration of 10wt%, stir and let it stand to remove impurities such as the lower layer of sediment, and then dry it at 100°C to dry The resulting product was cooled to room temperature and ground through a 100-mesh sieve to obtain purified bentonite;

[0017] (2) Add an appropriate amount of hydrochloric acid with a concentration of 12wt% into the container, add purified bentonite while stirring hydrochloric acid according to a solid-liquid ratio of 1:3, react in a constant temperature water bath at 80°C for 3.5 hours, and filter after the reaction is completed, and the obtained The filter cake was repeatedly washed 3 times with deionized water until the pH of the filtr...

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Abstract

The invention discloses a preparation method of hydroxyl-calcium bentonite for treating phosphorus-containing wastewater. Low-grade bentonite is purified, the purified low-grade bentonite is modifiedwith hydrochloric acid to expose active sites on the surface of the bentonite in order to facilitate subsequent hydroxylation, a part of calcium ions and sodium ions contained in the bentonite undergocation exchange, and the high ionic strength promotes the adsorption of phosphates in water by hydroxyl calcium ions; interlayer hydroxyl groups of the hydroxy-calcium bentonite and the phosphate undergo anion exchange, and the content of a supported compound is controlled to increase the content of hydroxy calcium, so the adsorption of phosphates in the water is improved to a certain degree; andthe modified bentonite prepared in the invention can be directly or indirectly used for treating the phosphorus-containing wastewater in order to realize the effective treatment of eutrophic water and significantly reduce the content of phosphates in water, and has the characteristics of good water purification effect, fast water purification and high safety.

Description

technical field [0001] The invention relates to the technical field of bentonite, in particular to a preparation method of hydroxycalcium bentonite for treating phosphorus-containing wastewater. Background technique [0002] The eutrophication of water bodies has become a major water environment problem facing the world today, and excessive phosphorus concentration is the main factor causing eutrophication of water bodies. Phosphorus (P) is a key nutrient element for the growth and reproduction of aquatic organisms. The sources of phosphorus in the overlying water of surface water bodies include the discharge of exogenous phosphorus sources and the release of endogenous phosphorus sources. Therefore, in order to control the eutrophication of surface water bodies, it is very necessary to take effective measures to remove phosphorus from exogenous phosphorus sources such as phosphorus-containing wastewater. At present, the main removal methods of phosphate (an important form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/10
CPCB01J20/041B01J20/12C02F1/281C02F2101/105
Inventor 王浩
Owner WUHU PENGLEI NEW MATERIAL
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