Large coal-electricity base mine water and fly ash comprehensive utilization method

Abstract

The invention belongs to the technical field of coal-electricity base waste utilization, and discloses a large coal-electricity base mine water and fly ash comprehensive utilization method which comprises the following steps: treating and firing are performed on fly ash to obtain an environment-friendly water treatment material; the obtained environment-friendly water treatment material is used for adsorbing and filtering mine water, and treated mine water is obtained; and the treated mine water is subjected to dust falling and greening application. By utilizing the characteristic of high specific surface area of the fly ash, the fly ash can be prepared into environment-friendly water treatment materials such as adsorption particles or filter filler and the like through firing; and the processing product is used for a water treatment process of mine water, heavy metal can be adsorbed, suspended particles (SS) can be filtered, and the treated mine water can be used for underground dust falling, cooling or fire fighting and the like of industrial and mining enterprises. According to the invention, two wastes discharged by a large coal-electricity base are comprehensively utilized, so that the environmental protection function of an enterprise is improved, and the operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste utilization in coal power bases, and in particular relates to a method for comprehensive utilization of mine water and fly ash in large coal power bases. Background technique [0002] At present: large-scale coal power base is an environmentally friendly development model that builds large-scale pithead power plants around coal mines and realizes the transformation of coal from "air travel" to coal transportation and power transmission. However, coal power bases currently produce mine water, fly ash and other wastes, which increase the environmental burden. Therefore, it is imperative to build a green circular economy industrial chain in coal power bases to reduce pollutant emissions and improve the comprehensive utilization of resources. [0003] The mine drainage of existing coal-fired power bases contains a lot of suspended particles (ss), and also contains heavy metal pollutants such as iron and...

AI Technical Summary

Problems solved by technology

However, at present, coal power bases produce mine water, fly ash and other wastes, which increase the environmental burden. Therefore, it is imperative to build a green circular economy industrial chain in coal power bases to reduce pollutant emissions and improve the comprehensive utilization of resources.

[0003] The mine drainage of the existing coal-fired power base contains a lot of suspended particles (ss), and also contains heavy metal pollutants such as iron and manganese. The direct discharge of mine water pollutes the environment and causes waste of water resources

Existing mine water treatment technology (such as publication numbers CN104370407A, CN104445677A) utilizes original tunnels and abandoned shafts to carry out in-situ water treatment, which saves a certain amount of land occupation cost, but its water treatment agents and filter materials, ceramic membranes It needs to be purchased from outside, which still accounts for a relatively high proportion of operating costs

On the other hand, the fly ash after burning coal in the pithead power station of the coal power base has a high carbon content and a small particle size, generally less than 100um. and waste of resources

Existing resource utilization methods are mostly used as cement, building materials, synthetic new materials, etc., as the patent aspect of water treatment adsorption / filter material, and some technologies (such as publication numbers: CN 1931733A, CN 111392804 A, etc.) are used as powder flocculant investment to achieve better water purification effect, but the amount of mud produced is large and mud-water separation is difficult; some technologies (such as publication number: 102824894B) modified fly ash water treatment materials have good mechanical properties and porosity, The water purification effect is better, but the modification method is sulfuric acid, which increases the environmental pollution load

At the same time, there are relatively few reports on fly ash water purifiers for mine water with high SS and heavy metals in iron and manganese

[0004] Through the above analysis, the problems and defects of the existing technology are: the secondary utilization of mine water and fly ash in the existing coal power base is carried out separately, the cost is high, and the transformation of comprehensive resources on the spot has not been realized, and it is aimed at high SS and The processing method of fly ash water purifying agent for pit water containing iron and manganese heavy metals needs to be further improved

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