Safety burning method for matter containing arsenic

A material and safe technology, applied in the field of environmental engineering, can solve the problems of environmental secondary pollution, arsenic volatilization, etc., and achieve the effect of avoiding pollution, small engineering amount and low investment

Inactive Publication Date: 2007-06-13
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 substanc

Method used

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  • Safety burning method for matter containing arsenic
  • Safety burning method for matter containing arsenic

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

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

[0023] The variation of the volatile loss rate of arsenic in the samples with the incineration temperature under different treatment conditions is shown in Figure 2. The results show that when the incineration temperature is 100~200℃, the loss rate of arsenic in the pure centip...

Example Embodiment

[0025] Example 2:

[0026] According to the process flow diagram of arsenic-containing substances added with arsenic-fixing agent for safe incineration treatment shown in Figure 1, taking the arsenic hyper-enriched plant Centipede grass as an example, compare the different usage amounts of two arsenic-fixing agents at an incineration temperature of 800 ℃ The fixing effect of arsenic in the sample. The weight of centipede grass in all treatments was 0.4g. The CK treatment in Figure 3 means that the pure centipede grass sample is directly incinerated at high temperature. The result shows that more than 22% of the arsenic will volatilize into the environment; the four treatments with the addition of arsenic agent can effectively control the volatilization of arsenic (the loss rate of As is lower 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 (adding CaO 0.2g) and Ca (adding CaO 0.1g). Therefore, considering the economi...

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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 52000-112000 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 established ...

Claims

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Application Information

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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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