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Method for forming adsorbent powder

An adsorbent, polyvinyl alcohol technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problem of large adsorption capacity loss, increased turbidity of effluent, and particle strength To achieve the effect of small loss of adsorption capacity, safe water quality and good toughness

Inactive Publication Date: 2011-03-30
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] (1) Lack of suitable molding methods and technologies, resulting in most of the research and development process staying in the laboratory and in the stage of adsorbent powder
[0004] (2) Some formed adsorbents have poor strength and are easily broken; adsorbents for removing arsenic and fluorine from drinking water are generally shaped or loaded and fixed into particles of a certain shape and size, and are filled in adsorption towers / tanks / columns for use
On the one hand, since the bed of the adsorption filter material has a certain height after filling, the self-weight of the adsorption bed, the hydrostatic pressure, the kinetic energy of the water in the treatment process, and the instantaneous high-speed water flow function in the backflushing process will all cause damage to the adsorbent particles, which may lead to adsorption. The particles of the agent are broken and the adsorbent is lost, so that the system cannot operate effectively for a long time; at the same time, the turbidity of the effluent water increases in a short period of time, and the dissolution and release of metal elements lead to potential safety hazards for drinking water
For example, activated alumina traditionally used at home and abroad has such problems. Dilute acid is added to activated alumina powder to form aluminum sol, or water is added, or scallop powder and water are added as binders. After molding, it is fired at high temperature, and finally The granules produced are characterized by poor granule strength, prominent breakage problems, and a significant increase in aluminum content in drinking water
[0005] (3) Some molding processes and molding materials contain harmful substances, which cannot guarantee the safety of drinking water
[0006] (4) The molding process causes a large loss of adsorption capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the present invention comprises the steps of:

[0022] 1) At normal temperature, while stirring, polyvinyl alcohol is added to water, stirred in a water bath, and then slowly heated to 60-80° C. to completely dissolve the polyvinyl alcohol, and naturally cooled to room temperature for later use; the degree of polymerization of the polyvinyl alcohol is 500-2500; the addition ratio is 5%-30%;

[0023] 2) While stirring, add carboxylic acid solution to the polyvinyl alcohol solution in step 1, the amount of carboxylic acid added is controlled at 5-40% of the degree of crosslinking, in a water bath, and the temperature of the water bath is controlled at 40-100 ° C to carry out the esterification reaction 2-6h, the esterification product solution was cooled to room temperature and then used for later use.

[0024] In the above steps, the concentration of carboxylic acid is 5%-30%, and the carboxylic acid is maleic acid, oxalic acid, malonic acid, s...

Embodiment 1

[0028] At room temperature, while stirring, polyvinyl alcohol with a degree of polymerization of 500 was added to water, and the addition amount was 5% (mass volume ratio, m / v, that is, 5 g of polyvinyl alcohol was added to 100 ml of water), and the water bath was slowly heated to 80 °C to completely dissolve the polyvinyl alcohol, and then cool down to 40 °C in a water bath. While stirring in a water bath, add oxalic acid solution to the polyvinyl alcohol solution. The amount of oxalic acid added is controlled at a cross-linking degree of 5%. In a water bath, the temperature of the water bath is controlled at 40 ° C. The esterification reaction is 2 hours, and the esterified product after the reaction is The solution was cooled to room temperature.

[0029] Then add this esterification product solution into the goethite sorbent powder prepared according to the published document Iron oxide in thelaborotary (U.Schwertmannite & Cornell), the addition ratio of the esterification...

Embodiment 2

[0032] At normal temperature, while stirring, polyvinyl alcohol with a degree of polymerization of 1750 is added to water in an amount of 10% (mass volume ratio, m / v, that is, 10 g of polyvinyl alcohol is added to 100 ml of water), in a water bath, and then slowly Raise the temperature to 80°C to completely dissolve the polyvinyl alcohol, then cool down to 60°C in a water bath. While stirring in a water bath, add maleic acid solution to the polyvinyl alcohol solution. The amount of maleic acid added is controlled at a cross-linking degree of 10%. In a water bath, the temperature of the water bath is controlled at 60 ° C. The esterification reaction is 2 hours, and the esterified product after the reaction is The solution was cooled to room temperature.

[0033]The esterification product solution is then added to the tetragonal sulfate lepidoxite powder prepared according to the published document Iron oxide in thelaborotary (U.Schwertmannite & Cornell), the addition ratio of t...

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Abstract

The invention relates to a preparation method used for forming an arsenic / fluorine-removing adsorbent, which comprises the following steps of: (a) adding polyvinyl alcohol into water at normal temperature while stirring, raising temperature and stirring to completely dissolve the polyvinyl alcohol, and then cooling to room temperature; (b) adding a carboxylic acid solution into a polyvinyl alcohol solution while stirring, carrying out esterification reaction, and cooling an esterification product solution to room temperature for standby; and (c) adding the esterification product solution intoadsorbent goethite, sulfate aka-ganeiteor ferrihydrite powder and uniformly mixing, extrusion-forming to obtain wet particles, then carrying out crosslinking treatment and drying to obtain an arsenic-removing adsorbent; or adding the esterification product solution into oxyhydroxide powder and uniformly mixing, extrusion-forming to obtain wet particles, then carrying out crosslinking treatment and drying to obtain a fluorine-removing adsorbent. The prepared adsorbent particles have the characteristics of high strength, toughness, less adsorption capacity loss in the forming process without swelling, and the like.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a method for forming adsorbent powder for removing arsenic and fluoride from drinking water. Background technique [0002] High levels of arsenic and high fluorine in groundwater are widely distributed around the world. The health problems caused by long-term drinking of high arsenic and high fluorine water have attracted the attention of relevant countries, organizations and the public. For the limit value of arsenic in drinking water, the World Health Organization (WHO), the U.S. Environmental Agency (EPA), the European Environment Agency (EEA) and the Ministry of the Environment of Japan all set it at 0.01mg / L. The limit value of fluorine in drinking water is set by the World Health Organization (WHO), the U.S. Environmental Agency (EPA), the European Environment Agency (EEA) and the Ministry of the Environment of Japan set their regulations at 0.6-1.5m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J20/28B01J2/20C02F1/28C02F1/58
Inventor 豆小敏梁文艳杨硕王毅力
Owner BEIJING FORESTRY UNIVERSITY
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