Adsorbing agent for eliminating S4O2<-> in acid mine wastewater and preparation method thereof

A technology for acid mine wastewater and adsorbent, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of secondary pollution, high operating cost, low pH value, etc., and reduce the cost of reagents , the effect of high selectivity and low chemical cost

Inactive Publication Date: 2012-10-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Existing commonly used SO 4 2- Removal technologies such as barium salt and calcium salt precipitation method, freezing method, mainly for SO in industrial brine 4 2- Removal, these methods are not suitable due to the large amount of AMD water and low pH
Moreover, the chemical dosing and precipitation method has high operating costs, which may cause secondary pollution or require post-treatment

Method used

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  • Adsorbing agent for eliminating S4O2&lt;-&gt; in acid mine wastewater and preparation method thereof
  • Adsorbing agent for eliminating S4O2&lt;-&gt; in acid mine wastewater and preparation method thereof
  • Adsorbing agent for eliminating S4O2&lt;-&gt; in acid mine wastewater and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of rice straw adsorbent and its removal to simulate SO in AMD 4 2-

[0032]Wash, dry, and pulverize the rice straw in turn for later use, weigh 6g of spare rice straw raw material (20-40 mesh) into a conical flask, add 200ml of NaOH solution with a mass concentration of 18%, soak at room temperature for 3 hours, and carry out alkali processing. The alkalized rice straw was pressed and filtered to remove water, and then reacted with 60ml of pure epichlorohydrin at 65°C for 6h. After the above reaction was completed, the remaining epichlorohydrin was recovered by filtration. Add 60ml of 33% (w / w) trimethylamine aqueous solution to the reaction system, and react at 80°C for 3h. The solid phase product obtained in the reaction was washed with ethanol with a volume ratio of 1:1, 0.1M NaOH and 0.1M HCl in sequence, and finally washed with deionized water until the washing liquid was neutral, and dried at 60°C to obtain the straw adsorbent .

[0033] Depend on...

Embodiment 2

[0036] Preparation of corn straw adsorbent and its removal to simulate SO in AMD 4 2-

[0037] The corn stalks were cleaned, dried, and pulverized in turn, and then used for later use. Weighed 6 g of spare corn stalk raw materials into an Erlenmeyer flask, added 200 ml of 10% NaOH solution, stood at room temperature and soaked for 12 hours, and carried out alkalization treatment. The alkalized rice straw was suction-filtered to remove water, and then reacted with 60ml of pure epichlorohydrin at 70°C for 3 hours. After the above reaction was completed, the remaining epichlorohydrin was recovered by filtration. Add 60ml of 33% (w / w) trimethylamine aqueous solution to the reaction system, and react at 85°C for 2h. The solid phase product obtained by the reaction was washed with ethanol at a volume ratio of 1:1, 0.1M NaOH and 0.1M HCl in sequence, and finally washed with deionized water until the washing liquid was neutral, and dried at 60°C to obtain the straw adsorbent .

[...

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Abstract

The invention discloses a preparation method of an adsorbing agent for eliminating S4O2<-> in acid mine wastewater, which comprises the following steps: (1) washing, stoving and crushing agricultural straws; (2) alkalizing the agricultural straws; (3) dehydrating the agricultural straws after the alkalization processing; (4) carrying out a cross-linking reaction on the dehydrated agricultural straws and excessive epoxy chloropropane and filtering to eliminate the residual epoxy chloropropane; (5) carrying out a season amination reaction on the products after the cross-linking reaction and an excessive trimethylamine aqueous solution to prepare solid phase products; and (6) washing and drying the solid phase products to prepare the adsorbing agent. The adsorbing agent of the invention has the advantages of effect and stably operation in acidic and neutral conditions, easy regeneration, repeatable use, low production cost and environmental protection.

Description

technical field [0001] The invention relates to a method for removing SO in acid mine wastewater 4 2- The invention relates to an adsorbent, specifically an agricultural straw modified adsorbent containing anion exchange groups, ie, quaternary ammonium groups, and a preparation method thereof, which belong to the field of water treatment technology and application. Background technique [0002] According to statistics, the discharge of various types of mine wastewater in my country is about 2.5 billion cubic meters per year, accounting for about 10% of the national industrial wastewater discharge. Among them, Acid Mine Drainage (AMD) has strong acidity, large discharge capacity, and contains a large amount of tolerant toxic metal ions and SO 4 2- , has become one of the most serious environmental problems in the mining process. The source of AMD is generally considered to be that in the mining process of coal mines and various metal ores, sulfide-containing ores are expo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 党志曹威易筱筠杨琛吴平霄
Owner SOUTH CHINA UNIV OF TECH
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