Gangue treatment method and application

A treatment method and technology for coal gangue, applied in the field of coal gangue treatment, can solve the problems of inability to fundamentally control spontaneous combustion, pollution of groundwater resources, and inability to meet environmental protection, etc., and achieve the advantages of excellent physical and chemical parameters, short removal period, and avoidance of heat accumulation. Effect

Active Publication Date: 2019-10-25
北京斯艾尔环境治理科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production units adopt treatment methods, such as digging trenches and layering, and covering each layer with loess; or directly stacking layers on the ground and burying the loess. These methods cannot fundamentally solve the problem of spontaneous combustion, and spontaneous combustion will still occur after a long time Phenomena, re-treatment is not only costly, but also causes serious pollution to air, soil and groundwater resources in the process, all of which are methods that treat the symptoms but not the root cause
Combined with the current development trend of our country, environmental governance in Shanxi is imminent, and the reserves of solid waste such as coal gangue in Shanxi Province are also very large. The old treatment methods can no longer meet the requirements of environmental protection, so we must seek an efficient and environmentally friendly method. Governance methods to improve the status quo and improve our environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: a kind of treatment method of coal gangue, the coal gangue engineering soil obtained therefrom and its application:

[0064] This preferred embodiment includes the following first to third aspects.

[0065] In the first aspect, the present embodiment provides a method for processing coal gangue, which includes the following steps:

[0066] A. mix pickling with coal gangue powder and water and acid to get pickling gangue powder;

[0067] B. adding water to granulate the pickling gangue powder after removing pyrite to obtain gangue-based microspheres;

[0068] C. impregnating coal gangue-based microspheres into a solution containing iron salts and zinc salts to obtain impregnated microspheres;

[0069] D. impregnating the microspheres for ozone aeration and ultrasonic treatment to obtain activated gangue microspheres;

[0070] E. Alkali is added to the activated coal gangue microspheres, and the solid and liquid are separated to obtain activated coal ga...

experiment example 1

[0099] Experimental Example 1: Detection of heavy metal content of crops planted with coal gangue engineering soil described in Example 1:

[0100] The coal gangue engineering soil described in Example 1 was used to plant crops, including spinach, rapeseed and Artemisia stalks, according to national standards GB5009.12-2010, GB5009.15-2014, GB5009.17-2014, GB5009.11-2014 and GB5009 .123-2014 Detection of heavy metal content in three crops, the statistical results are as follows Figure 1~3 shown by Figure 1~3 It can be seen from the diagram that the coal gangue engineering soil prepared by the method of this application can be used as the soil for planting crops. After the crops grow and bear fruit, the air, soil and groundwater around the crops themselves, their fruits and the experimental base have been tested for a period of time. One year of monitoring, the test results show that the plants and fruits fully meet the national standards; the air, soil and groundwater aro...

experiment example 2

[0109] Experimental example 2: temperature detection of coal gangue engineering soil mound:

[0110] The final product coal gangue engineering soil of Example 1 and Comparative Examples D3-D5 were piled up, and the temperature was measured after 10 days. The temperature measurement range of the sensor was 0-500°C, the temperature measurement accuracy was ±1°C, and the length of the measuring rod was 2m , the material of the probe is stainless steel, and the length of the probe is 10cm; As can be seen from Table 1, the temperature of the heap in Example 1 of the preferred embodiment of the present application is significantly lower than that of the raw powder of coal gangue, indicating that it emits less heat, and can greatly avoid heat accumulation in the later stage of accumulation process. The heating up of coal gangue and even the occurrence of spontaneous combustion will minimize the threat of coal gangue to the ecological environment, enterprise production safety and em...

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Abstract

The invention relates to the technical field of gangue treatment, in particular to a gangue treatment method and application. The treatment method comprises the steps of pickling gangue powder; addingwater for granulation after removing pyrites from the gangue powder, and obtaining gangue based microspheres; dipping the gangue based microspheres in solutions containing ferric salt and zinc salt,and obtaining dipped microspheres; performing ozone aeration and ultrasonic treatment to the dipped microspheres, and obtaining activated gangue microspheres; adding alkali to the activated gangue microspheres for solid-liquid separation, and obtaining activated gangue; and mixing the activated gangue and sodium alginate aqueous solutions, and obtaining gangue engineering soil through drying. Recovery and reuse of gangue are achieved, and the pyrite content of the end-product gangue engineering soil is reduced obviously; the phenomena of heat accumulation and gangue heating, even spontaneous combustion in the later accumulation process can be avoided greatly; the security threat is reduced, and the mechanical property of the gangue engineering soil is excellent, and can be applied to grainfor green land, engineering construction land and high-grade highway construction projects.

Description

technical field [0001] The invention relates to the technical field of coal gangue treatment, in particular to a treatment method and application of coal gangue. Background technique [0002] Coal gangue is solid waste produced during coal mining and coal preparation, containing organic matter and pyrite (FeS 2 ), can be oxidized by oxygen in the air and release heat. With the accumulation of heat, the temperature of gangue gradually rises. When the temperature rises to the ignition point of gangue and combustibles (300-350°C), spontaneous combustion will occur. CO and SO produced by spontaneous combustion 2 Harmful gases such as gas can pose a serious threat to the ecological environment, enterprise production safety and employee health. Spontaneous combustion of coal gangue releases a large amount of SO 2 , CO, CO 2 、H 2 S. NO X The gas emits a certain amount of toxic substances such as nitrogen oxides and benzopyrene into the air, and the dust in the smoke gangue w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/40
Inventor 李显忠史军民
Owner 北京斯艾尔环境治理科技股份有限公司
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