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Complex preventing and controlling process and technology for coal solid waste sulfur contamination

A solid waste and comprehensive prevention and control technology, which is applied in the field of comprehensive prevention and control technology and technology of coal-based solid waste sulfur pollution, can solve the problems of serious environmental pollution and low waste utilization, achieve the reduction of salt ion concentration, realize comprehensive utilization, Effect of reducing sulfur content

Inactive Publication Date: 2007-10-17
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the low utilization of existing wastes and serious environmental pollution, the present invention will provide a treatment technology that can reduce the sulfur pollution of high-sulfur coal gangue, that is to use the characteristics of waste fly ash and adopt different process proportioning methods to effectively To prevent and control sulfur pollution, this technology provides scientific technology and methods for the comprehensive utilization of waste and the realization of pollution control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Culture substrate: select coal gangue and fly ash with a particle size of <2mm

[0013] Test device: a columnar leaching device is used, and the leaching column is made of PVC pipe with a size of φ20cm×50cm. The bottom is lined with a layer of filter cloth, the lower end is open, and the leachate flows into the beaker under the leaching column.

[0014] Test plan: Load samples of the same volume and different weights into the leaching column, and keep the height of each treatment matrix at 40cm. Add deionized water to keep the sample in a wet state and reach the maximum saturated water holding capacity. After standing for 24 hours, leaching with deionized water every 72 hours, continuous leaching until low sulfur. Three treatments were set up in the test, namely: coal gangue with small particle size <2 mm, fly ash and coal gangue were packed in two layers, each layer was 20 cm thick and fly ash was in the lower layer (V / V=1:1), powder Coal ash and coal gangue were pa...

Embodiment 2

[0018] Embodiment 2, the basic test device and proportioning treatment are the same as in Embodiment 1, and the particle size of coal gangue is a large particle size of 2-5mm. The 2-layer ratio of coal gangue and fly ash has a better control effect on sulfur pollution than the 4-layer ratio, which increases the pH value of the leachate, reduces the concentration of salt ions, and reduces the content of sulfate radicals. The contribution rate of fly ash reaches 64%.

Embodiment 3

[0019] Embodiment 3: basically identical with embodiment 2, test device becomes φ 50cm * 50cm, 2 layers of proportioning coal gangue and fly ash are better than 4 layers of proportioning to the control effect of sulfur pollution, improved leachate pH value, reduced Salt ion concentration, reduce sulfate content, fly ash contribution rate reaches 38%.

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Abstract

According to circulating economic principle, sulphur pollution problem in coal gangue can be solved by using alkalescence of waste fly ash. A columnar eluviation method is adopted to resolve the sulphur pollution problem of the coal gangue and reduce pollution to soil and water body caused by coal gangue sulfuration through a different proportion process of the fly ash and the coal gangue. Leachate PH value can be increased, leachate salt ion concentration and sulphur emersion quantity can be reduced efficiently by proportion treatment in such a way that: based on the same volume, the coal gangue with different particle diameter matches with fly ash to form two layers (20cm coal gangue, and 20cm fly ash disposed on lower layer), and to form four layers(the coal gangue and the fly ash are spaced with each other to form 4 layers, each of which has thickness of 10cm, and the fly ash is disposed on the lowest layer). According to the sulphur pollution control effect, the two layers proportion 20cm thickness fly ash treatment is superior to four layers proportion 10cm thickness fly ash treatment, and contribution rate of the fly ash for controlling sulphur pollution of the leachate can reach 64%, which shows that the fly ash has better application potential for treating sulphur pollution problem of coal gangue.

Description

technical field [0001] The invention relates to a process and technology for comprehensive prevention and control of sulfur pollution by coal-based solid waste, in particular to different process technologies for the prevention and control of sulfur pollution by fly ash on coal gangue. Background technique [0002] High-sulfur coal gangue is a waste in the mining process of high-sulfur coal. Due to the influence of resource properties, economic conditions, technical equipment and market changes, the utilization rate of high-sulfur coal gangue is very low, except for a small number of produced building materials such as production Except for industrial development and utilization such as cement or fuel, most of them are still stacked in the open air to form gangue hills, and the proportion is increasing day by day. The country's proven raw coal reserves are nearly 1.5×10 12 t, my country's high-sulfur coal reserves account for 1 / 3 of the country's total coal reserves, while ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 毕银丽苏高华
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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