Roasting gypsum and coal gangue to produce building materials and power generation equipment systems

Abstract

The invention discloses an equipment system for producing a building material and generating power by roasting gypsum and coal gangue. The equipment system comprises a raw material crushing and pretreating unit, a measuring and proportioning unit, a roasting unit, a waste heat power generating unit and a pulverizing unit, wherein the raw material crushing and pretreating unit, the measuring and proportioning unit, the roasting unit and the waste heat power generating unit are connected in sequence, and the roasting unit is connected with the pulverizing unit. The system is simple in equipment and low in investment; the produced roasted residues and a series of building material products are wide in market application, low in cost, good in performance and high in industrial competitiveness; a plenty of industrial waste gypsum and coal gangue can be utilized, so that the problems of environment pollution and secondary disasters caused by wastes can be solved, and a plenty of non-renewable coal and clay can be saved; building materials can be produced at basically zero coal and external electric energy consumption instead of high coal and electric energy consumption, so that the equipment system is beneficial to the sustainable development of society and is environmental friendly.

Description

technical field [0001] The invention relates to a power generation equipment system for producing building materials by roasting gypsum and coal gangue and utilizing waste heat of roasting waste gas. Background technique [0002] With the development of industry, especially the development of phosphorus chemical industry and the mandatory implementation of desulfurization and denitrification environmental protection policies of industrial enterprises, various waste gypsum, especially phosphogypsum and desulfurization gypsum, have become another major source of water and soil pollution. The main method of treating waste gypsum Have: [0003] 1) Looking for land for stockpiling or landfilling, and some even pouring waste gypsum directly into caves, mines, underground rivers and remote ditches and rivers, resulting in serious pollution to the water and soil environment; [0004] 2) After modification or solidification, it replaces natural gypsum as cement coagulation agent, an...

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Problems solved by technology

[0006] 4) Drying and grinding waste gypsum to make sulfuric acid and by-product cement. Facts have proved that it not only needs to consume a large amount of high-quality bituminous coal and electric energy, but also pollutes the environment, requires large investment and high cost. At present, enterprises basically stop production due to lack of economy. ;

[0007] 5) The waste gypsum powder is compounded into a "soil modifier", but practice shows that this so-called "soil modifier" cannot really improve the soil, but hardens the soil and expands heavy metal pollution

[0008] On the other hand, as the scale of coal mining expands, coal gangue piles up like mountains, and many secondary disasters have occurred in many mining areas. In order to encourage coal mines to use coal gangue, the government has issued a subsidy of 100 yuan for each ton of coal gangue used. Preferential policies, but the effect is still small

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