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Arsenic-fixing agent and preparation method thereof, and method utilizing arsenic-fixing agent to fix arsenic

A technology for fixing arsenic and metal salts, which is applied in the field of environmental governance and can solve the problems of unreported arsenic solidification rate, etc., and achieve good economic and environmental comprehensive benefits, lower concentration, and low raw material prices

Active Publication Date: 2015-07-15
沃德费默循环经济科技发展(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the use of metal salts to modulate and modify limestone can improve its sulfur fixation efficiency, but whether the modified limestone can improve the solidification rate of arsenic in coal combustion has not been reported

Method used

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  • Arsenic-fixing agent and preparation method thereof, and method utilizing arsenic-fixing agent to fix arsenic
  • Arsenic-fixing agent and preparation method thereof, and method utilizing arsenic-fixing agent to fix arsenic
  • Arsenic-fixing agent and preparation method thereof, and method utilizing arsenic-fixing agent to fix arsenic

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In order to improve the arsenic solidification efficiency of calcium matrix materials, the porosity and specific surface area of ​​traditional calcium matrix are improved by modification, and the activity of calcium ions is increased to further improve the arsenic fixation efficiency. In this embodiment, the calcium carbonate is prepared by adding different metal salts, and the arsenic-fixing agent with the best arsenic-fixing effect is obtained by constantly changing the types and blending ratios of the metal salts.

[0027] The present embodiment is studied by orthogonal experiments, and the adopted factors are respectively: the type of metal salt and its ion ratio γ (the ion ratio referred to in the present invention represents Ca 2+ / molar ratio of other metal salt ions) and combustion temperature on the arsenic fixation rate. Metal salt choose Na 2 CO 3 、K 2 CO 3 and Al 2 (SO 4 ) 3 , the combustion temperature of the orthogonal experiment is selected from t...

Embodiment 2

[0047] Two-factor analysis of variance experiments were designed with temperature and calcium carbonate addition as two factors in the experiment. Among them, the dosing ratio (λ) refers to the mass percentage (%) of the added arsenic fixation agent and raw coal, and there is no interaction between the two factors of temperature and dosing ratio. According to the research on the arsenic fixation of calcium matrix materials in the prior art, it is found that the coal combustion temperature has a significant effect on the arsenic fixation effect, and the effect is generally best at 900°C to 1100°C. In view of the safe operating temperature of the fluidized bed, the combustion temperature is set at four levels: 800°C, 900°C, 1000 and 1100°C. At the same time, the dosing ratio of arsenic-fixing agent was designed to be 0.5%, 1%, 3% and 5%, and one experiment was done for each level of combination. Then carry out the arsenic fixation experiment according to the method of Example 1...

Embodiment 3

[0052] Analysis of melting characteristics and surface characteristics of arsenic-fixing agent coal samples

[0053] The pretreated coal samples were taken without adding arsenic-fixing agent and adding arsenic-fixing agent with a dosage of 1% (Ca 2+ :Al 3+ : Na + :K + The ion ratio is equal to 1: (1 / 15): (1 / 6): (1 / 4)), then fully burn in the muffle furnace and then observe the weight loss of the coal sample, and draw the TG-DSC curve according to the weight loss. The TG-DSC curve of the unreinforced arsenic coal sample is as follows Figure 4 Shown, its characteristic peak is shown in table 6. The TG-DSC curve of arsenic-fixed coal sample is as follows Figure 5 Shown, its characteristic peak is as shown in table 7.

[0054] Table 6. Characteristic peaks of TG-DSC curves of unreinforced arsenic coal samples

[0055]

[0056] Depend on Figure 4 It can be seen from Table 6 that there is an obvious weight loss zone in the combustion process, and the temperature range...

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Abstract

The invention discloses an arsenic-fixing agent and a preparation method thereof, and a method utilizing the arsenic-fixing agent to fix arsenic. The arsenic-fixing agent is composed of calcium carbonate and a metal salt. The preparation method comprises the steps of drying calcium carbonate, then placing calcium carbonate in a metal salt solution, carrying out water bath heating for 2-2.5 hours under a condition of the temperature of 95+ / -5 DEG C while constantly stirring with a glass rod, filtering, finally drying under a condition of the temperature of 100-110 DEG C, and grinding to 180-300 mesh. The surface of a micro zone of the prepared arsenic-fixing agent is rough, gaps are prosperous, large pores and small pores have the same number, the porosity and the specific surface area are greatly improved, arsenic-fixing effects on high-arsenic fire coal under the condition of high temperatures are good, and economic and environmental comprehensive benefits are significant.

Description

technical field [0001] The invention belongs to the field of environmental treatment, and specifically relates to an arsenic-fixing agent and a preparation method of the arsenic-fixing agent, and also relates to a method for using the arsenic-fixing agent to fix arsenic. Background technique [0002] my country has abundant reserves of coal resources, and the amount of proven resources ranks third in the world. Among the reserves of primary energy resources, coal accounts for 94%. China's coal-based energy resources determine that my country's primary energy production and consumption will not change in the next 20 to 50 years. Coal is an unclean fuel, and more than 80 kinds of trace elements have been found in coal, including 22 kinds of harmful or potentially harmful trace elements. During the coal combustion process, harmful or potentially harmful trace elements will be emitted into the atmosphere in different forms, resulting in harmful or potentially harmful trace elem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/10C10L10/00
Inventor 李东伟郭胜利黄涛
Owner 沃德费默循环经济科技发展(北京)有限公司
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