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
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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 as a function of incineration temperature is shown in Figure 2. The result shows that when the incineration temperature is 100~200 ℃, the loss rate of arsenic in the pure centipede grass sample is very low (<1%); ...
Embodiment 2
[0026] According to the schematic diagram of the safe incineration process of adding arsenic-fixing agents to arsenic-containing substances as shown in Figure 1, taking the arsenic hyperaccumulator plant Centipede Grass as an example, the different dosages of two arsenic-fixing agents were compared at an incineration temperature of 800 °C Fixation effect on arsenic in samples. The weighing amount of centipede grass in all treatments is 0.4g. The CK treatment in Fig. 3 shows 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 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 (add CaO 0.2g) and Ca (add CaO 0.1g). Therefore, considering the economic effectiveness of the pra...
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