Safety burning method for arsenic-enriched plant ciliate desert-grass

A technology for enriching plants and centipede grass, applied in the field of environmental engineering, can solve problems such as arsenic volatilization, secondary environmental pollution, etc., and achieve the effects of small engineering volume, pollution avoidance, and high management technical requirements

Inactive Publication Date: 2009-06-03
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, arsenic is a volatile element, and the incineration of arsenic-containing substances will cause the volatilization of arsenic, causing secondary pollution to the environment

Method used

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  • Safety burning method for arsenic-enriched plant ciliate desert-grass
  • Safety burning method for arsenic-enriched plant ciliate desert-grass
  • Safety burning method for arsenic-enriched plant ciliate desert-grass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking the arsenic hyperaccumulator plant Centipede Grass as an example, first dry and pulverize Centipede Grass (with a particle size of 2 mm), weigh 0.2 g of the sample and put it into a crucible. The pure centipede grass sample was directly put into the muffle furnace for ashing treatment; a part of the centipede grass sample was first added with 15% Mg(NO 3 ) 2 The solution is wet, heated at 80°C, and after drying, spread 0.2g of MgO dry powder (with a particle size of 0.15-0.2mm) evenly on the surface of the sample; add 0.2g of CaO powder to some centipede grass samples and mix well. Incineration treatment is carried out at 300, 400, 500, 600, 700 and 800°C.

[0023] The volatilization loss rate of arsenic in samples under different treatment conditions varies with the incineration temperature see figure 2 . The results showed that when the incineration temperature was 100-200 °C, the loss rate of arsenic in the pure centipede grass sample was very low (<1%); ...

Embodiment 2

[0026] according to figure 1 The schematic diagram of the safe incineration process of adding arsenic-fixing agents to arsenic-containing substances is shown. Taking the arsenic hyperaccumulator plant Centipede Grass as an example, compare the effects of different dosages of two arsenic-fixing agents on the samples at an incineration temperature of 800°C. Arsenic fixation effect. The weighing amount of centipede grass in all treatments is 0.4g. image 3 The CK treatment in the above indicates that the pure centipede grass sample is directly burned at high temperature, and the results show that more than 22% of the arsenic will volatilize into the environment; the 4 treatments that add arsenic-fixing agent can effectively control the volatilization of arsenic (As loss rate is less than 3% ): Mg (add MgO 0.2g, 15% Mg(NO 3 ) 2 solution 5ml), Mg (add MgO 0.1g, 15% Mg (NO 3 ) 2 solution 2.5ml), Ca (add CaO 0.2g) and Ca (add CaO 0.1g). Therefore, considering the economic effec...

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Abstract

The invention relates to arsenic bearing material safe burning method. It includes the following steps: wetting the pulverized arsenic bearing material by 15% Mg(NO3)2; drying; mixing with the MgO powder as the 2-4:1(W / W); or directly mixing the pulverized one with the CaO as 2-4:1(W / W); burning at 300-800 degree centigrade; reclaiming the extra MgO or CaO. The method can effectively prevent arsenic from volatilizing, and greatly reduce pending material and next disposing cost. The arsenic solidifying agent can avoid its leaching while processing to reduce secondary pollution risk. This method can be used in burning for arsenic bearing plant, arsenic bearing conserving agent processed wood, high arsenic coal etc.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a method for treating arsenic-containing substances, in particular to a method for safely incinerating arsenic-containing substances, and a method for avoiding pollution of the atmospheric environment caused by arsenic volatilization during the incineration process. Background technique [0002] Arsenic is a toxic metalloid element. According to statistics, the arsenic input into the soil due to human activities can reach 52 000-112 000 tons per year (Nriagu and Pacyna, "Nature", 1988, Vol. 333, pp. 134-139). Arsenic pollution will pose a threat to human health, but the control of arsenic pollution is very difficult. [0003] Phytoremediation technology is a "green" environmental protection technology that uses plants to remove pollutants in the environment. It has the advantages of low investment and simple operation. In 2001, Chen Tongbin and others establishe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/02F23G7/00
Inventor 阎秀兰陈同斌廖晓勇黄泽春
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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