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Method for producing modified bentonite by using urea-chitosan

A technology of bentonite and chitosan, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as additional pollution costs, and achieve the effects of good fixation effect, good application prospect and obvious removal effect.

Active Publication Date: 2015-04-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problems of additional pollution and high cost caused by the traditional fixative treatment of heavy metal pollution, and to provide a urea-chitosan A method for producing modified bentonite, so that the obtained modified bentonite has a better modification effect under acidic conditions

Method used

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  • Method for producing modified bentonite by using urea-chitosan
  • Method for producing modified bentonite by using urea-chitosan
  • Method for producing modified bentonite by using urea-chitosan

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method utilizing urea-chitosan to produce modified bentonite comprises the following specific steps:

[0026] (1) Take 2g urea and join in 50g bentonite and stir and grind, add water 500g to make bentonite suspension;

[0027] (2) Weighing 5g of chitosan, adding 500ml of acetic acid solution with a mass fraction of 1.0-3.0% for dissolving, to obtain chitosan-acetic acid solution.

[0028] (3) Slowly add the chitosan acetic acid solution obtained in step (2) to the bentonite suspension obtained in step (1) in a water bath at 80°C, and continue to bathe in water for 2 hours at a temperature of 80°C. , cooled to room temperature, filtered, washed the filter cake 5 times, and dried the resulting filter cake in an oven at 80°C for 24 hours; then ground it and passed it through a 200-mesh sieve to obtain modified bentonite.

[0029] 1. the original soil and the modified bentonite obtained in Example 1 are to the comparative test of the fixation rate of zinc in the tailings...

Embodiment 2

[0038] A method utilizing urea-chitosan to produce modified bentonite comprises the following specific steps:

[0039] (1) Take by weighing 1g urea and join in 40g bentonite, stir and grind, add water 400ml to make bentonite suspension;

[0040] (2) Weigh 4.5g of chitosan, add 400ml of acetic acid solution with a mass fraction of 1.0% to dissolve, and obtain chitosan-acetic acid solution.

[0041] (3) Slowly add the chitosan acetic acid solution obtained in step (2) to the bentonite suspension obtained in step (1) in a water bath at 70°C, and continue to bathe in water for 2 hours at a temperature of 70°C. , cooled to room temperature, filtered, washed the filter cake 3 times, and dried the obtained filter cake in an oven at 70°C for 24 hours; then ground it and passed it through a 200-mesh sieve to obtain modified bentonite.

Embodiment 3

[0043] A method utilizing urea-chitosan to produce modified bentonite comprises the following specific steps:

[0044] (1) Take by weighing 3g urea and join in 55g bentonite, stir and grind, add water 550ml part and make bentonite suspension;

[0045] (2) Weigh 6.0 g of chitosan, add 550 ml of 2.5% acetic acid solution in mass fraction to dissolve, and obtain chitosan acetic acid solution.

[0046] (3) Slowly add the chitosan acetic acid solution obtained in step (2) dropwise to the bentonite suspension obtained in step (1) in a water bath at 85°C, continue the water bath at a temperature of 85°C for 2.5h, and the water bath ends Afterwards, cool to room temperature, filter, wash the filter cake with water 6 times, and dry the obtained filter cake in an oven at 85°C for 20 hours; then grind and pass through a 200-mesh sieve to obtain modified bentonite.

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Abstract

The invention discloses a method for producing modified bentonite by using urea-chitosan, which includes the following steps: on a weight basis, adding 1-5 parts of urea into 40-60 parts of bentonite, mixing and grinding, adding 400-700 parts of water to obtain a bentonite suspension; on a weight basis, dissolving 3-7 parts of chitosan into an acetic acid solution with a mass fraction of 1.0-3.0% to obtain a chitosan acetic acid solution with a chitosan mass fraction of 1.0-2.0%; dropwise adding the chitosan acetic acid solution into the bentonite suspension in a water bath, water-bathing for 2-3h, cooling and filtering, washing a filter cake with water, drying, grinding and sieving the filter cake to obtain the modified bentonite. The inventive method has the advantages of simple process and low production condition requirements; and the resulting adsorbent has obvious removal effect in acidic condition, the production process is convenient and feasible, and has good application prospects.

Description

technical field [0001] The invention relates to the field of preparation of modified bentonite, in particular to a method for producing modified bentonite by utilizing urea-chitosan. Background technique [0002] At present, there are several technologies for treating tailings heavy metal pollution: neutralization method, fungicide method, covering isolation method and passivation coating method, among which spraying fixative to treat tailings has lower cost and is more convenient to operate. Finding a cost-effective fixative is an important part of tailings treatment. Phosphate and hydroxyapatite are commonly used fixatives, but they are expensive and may cause phosphorus pollution, which limits their application. [0003] The main component of bentonite is montmorillonite, which has a certain adsorption capacity. It has abundant reserves in our country and low price. It has great application potential after reasonable modification. The adsorption effect of modified benton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30
CPCB01J20/24B01J20/3085B01J2220/46
Inventor 王维生付旺应成璋韦月越龙海洋
Owner GUANGXI UNIV
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