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Method for in-situ pillared modification of bentonite and algal-removing water purifying agent

A technology of algae water purifying agent and bentonite, which is applied in the field of mineral type algae removing water purifying agent, can solve the problems of poor sedimentation and separation performance, large residual turbidity, poor permeability, etc., and achieve fast sedimentation speed, simple modification method and low cost. low effect

Inactive Publication Date: 2010-02-24
NINGBO XINKE TEXTILE AUXILIARY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the practical problems existing in the existing clay algae removal technology, another purpose of the present invention is to develop a mineral type algae removal water purifier with bentonite as the main component according to the above-mentioned modification method. The water agent is environmentally friendly and has a small dosage. It retains the respective advantages of PAC water treatment agent and traditional pillared modified bentonite, and solves the problems of poor permeability, large dosage, large residual turbidity, and Key problems such as floc looseness and poor sedimentation separation performance

Method used

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  • Method for in-situ pillared modification of bentonite and algal-removing water purifying agent

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Embodiment 1

[0027] Add water to 400 mesh Zhejiang Anji calcium-based bentonite and adjust to 500mL 5% suspension slurry, after ultrasonic stirring, use 2mol·L -1 Soak in dilute hydrochloric acid for activation for 1 day, adjust to neutral with NaOH after washing, centrifuge to discard the supernatant, and measure the water content of the filter cake by gravimetric method. Press Al again 3+ / soil ratio is the consumption of 8mmol / g, soaks filter cake with AlCl3 solution for 3 days, makes Al 3+ Solution complexation, ion exchange into mineral interlayer domains. The modified bentonite slurry after stirring and dispersing was slowly dripped with OH at a rate of 1.0ml / min under 400W microwave power radiation. - / Al 3+ NaOH solution with a molar ratio of 2.4, cooled naturally after dropping, and aged at a constant temperature at 25°C for 3 days to obtain endogenous Al 13 Compared with the exogenous modification method, the pillared liquid algae-removing water purifier has short synthesis ...

Embodiment 2

[0029] Commercially available sodium-based bentonite (200 mesh) was added with water to make 250 mL of a suspension with a solid content of 5%. -1 Soak in dilute hydrochloric acid to activate for 1 day, adjust to neutral with NaOH after washing, centrifuge to discard the supernatant, and measure the water content of the filter cake by gravimetric method. then press Al 3+ / soil ratio = 5mmol / g dosage, under ultrasonic stirring, use AlCl 3 The solution soaked the filter cake for 1 day to make the Al 3+ Solution complexation, ion exchange into mineral interlayer domains. Then stir and disperse into a 5% bentonite slurry, and slowly drop in OH at a rate of 2.0ml / min under 250W microwave power radiation. - / Al 3+ Na with a molar ratio of 2.4 2 CO 3 Solution, cooled naturally after dropping, and aged at 25°C for 3 days to obtain endogenous Al 13 Pillar-supported liquid algae-removing water purifier.

[0030] In application, the synthetic mineral algae-removing water purifie...

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Abstract

The invention belongs to the field of natural fresh water environment protection and mineral processing and utilization and discloses a method for in-situ pillared modification of bentonite and an algal-removing water purifying agent prepared by using the same. Unlike the conventional pillared modification method, the method of the invention is characterized in that: Al<3+> is complexed and exchanged into an mineral inter-layer domain first through ion exchange; and microwave radiation and alkali titration are used to force the Al<3+> to undergo in-situ hydrolytic polymerization in a smectiteinterlayer domain to form Al13 pillar. The method directly uses bentonite of any quality, saves a bentonite sodium treatment process and is simple, low in cost and high in synthesis efficiency. The algal-removing water purifying agent of the invention gives an effective play to the adsorption property of the bentonite and the coagulation, electrical neutralization and other functions of Al13<7+> polycation, has obvious advantages of environmental protection, low cost, compact coagulation, quick sedimentation, removal of suspended matters such as blue-green algae, turbidity and phosphorus nitride and the like and ensures that the treated water is transparent and stable in alkalinity or acidity of the water quality.

Description

technical field [0001] The invention belongs to the fields of natural or artificial water environment protection and mineral processing and utilization, and specifically relates to an in-situ pillar modification method of bentonite and a mineral-type algae-removing water purifier prepared by the modification method. Background technique [0002] In recent years, the degree of eutrophication in rivers, lakes and reservoirs, which are drinking water sources in my country, has become increasingly serious. The area, frequency and intensity of cyanobacterial blooms and the production of algal toxins have shown a rapid increase trend. The direct consequence is that dissolved oxygen in water The rapid decrease in concentration, the massive death of aquatic animals and plants, and the destruction of the surrounding landscape and ecological environment will increase the cost of drinking water production. At the same time, it will also affect the investment industry, aquaculture industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/52C02F1/28
Inventor 王趁义
Owner NINGBO XINKE TEXTILE AUXILIARY
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