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Cement kiln co-processing process for hazardous solid wastes

A hazardous waste and co-processing technology, which is applied in the direction of cement production and waste content reduction, can solve the problems of inability to dispose of dioxin, occupy land resources, and secondary pollution of waste gas, and achieve resource saving and significant economic benefits. The effect of high temperature and large amount of material to be processed

Active Publication Date: 2013-06-12
杭州易辉环保科技有限公司
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AI Technical Summary

Problems solved by technology

However, the stockpiling method and land cultivation method have certain requirements on the waste composition, and are generally only used to dispose of insoluble, dust-free, non-rotten, heavy metal-free solid waste that does not endanger the surrounding environment. Toxic and harmful substances cannot be used. to prevent entry into the biological circulatory system
Solidification and stabilization include cement solidification, chelating agent stabilization, compression solidification, etc. Wastes after solidification and stabilization treatment will eventually be buried in landfills, where heavy metals may be re-dissolved for a long time, and dioxins cannot be disposed of. Unfortunately, landfill disposal also takes up valuable land resources
Disposal by melting and incineration will produce secondary pollution of waste gas, and the treatment cost is relatively high

Method used

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  • Cement kiln co-processing process for hazardous solid wastes
  • Cement kiln co-processing process for hazardous solid wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Incineration fly ash from a grate furnace of a municipal solid waste incineration plant, Cl - The content is 8.94%, Al 2 o 3 , CaO, SiO 2 , the contents were 9.56%, 19.11%, and 25.98% respectively, accounting for 54.65% of the total. The composition of the incineration fly ash is similar to that of shale, the raw material for cement production, so it can replace part of shale to burn cement and save the amount of shale used.

[0028]The incineration fly ash produced by the domestic waste incineration plant is transported to the cement plant by a tank truck, and then the fly ash is transported to the fly ash storage tank by the pneumatic conveying device attached to the tank truck. According to the ratio of cement plant raw materials and incineration fly ash to replace cement raw materials by 0.5%, adjust the transmission rate of the metering screw cutter scale to 0.83 tons / hour, and the measured incineration fly ash is transported to the powder silo through the meter...

Embodiment 2

[0030] In the polluted soil of an urban chemical plant, the total Cl content is 0.329%, and the main components of the contaminated soil are 76.77% Si, 11.53% Al, 4.38% Fe, 2.68% Ca, and 1.23% Mg, accounting for the total 96.59%. Among them, Si and Ca components are the main components in cement production raw materials, so they can replace part of cement production raw materials to burn cement and save cement raw materials.

[0031] After the polluted soil arrives at the factory, it is conveyed to the drying equipment through a closed conveyor belt for drying treatment. The waste gas generated during the drying process is collected by the waste gas collection device and then transported to the tail smoke chamber of the cement kiln for treatment through a closed pipeline. After the sludge is discharged, it directly enters the crusher for crushing, and the crushed polluted soil enters the crusher for crushing. The polluted soil crushed into powder is replaced by 4% of the ceme...

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Abstract

The invention provides a cement kiln co-processing process for hazardous solid wastes. The process comprises the following steps of: a) performing drying, crushing and grinding preprocessing on the hazardous solid wastes; b) conveying the preprocessed hazardous solid wastes to a powder bin; and c) feeding the hazardous solid wastes from the powder bin, pneumatically conveying to a smoke chamber of a cement kiln, and processing. The hazardous solid wastes are directly conveyed to the smoke chamber of the cement kiln, and by utilizing the characteristics of high combustion temperature, high material processing capacity and the like of the cement kiln, the hazardous solid wastes replace partial cement raw material to be fired into cement; meanwhile, effects of reducing volume and quantity and comprehensively utilizing are achieved, and the hazardous solid wastes are subjected to reduction, harmlessness and resource processing.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment in the field of environmental protection, and in particular relates to a process for co-processing solid hazardous waste with a cement kiln. Background technique [0002] With the rapid development of the national social economy, the generation of solid hazardous waste has also increased sharply. If it is not dealt with effectively, it will seriously affect the sustainable development of the social economy. In 2004, the national solid hazardous waste production was 1.2 billion tons, an increase of 20% over the previous year; among them, industrial and mining enterprises produced about 30 million tons of toxic and hazardous wastes each year. These hazardous wastes are corrosive, flammable, reactive, acute Toxicity and leaching toxicity are the main pollution sources of air, water and soil. The annual growth rate of garbage in my country is increasing at a rate of more than 10%. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/24
CPCY02P40/145Y02P40/10
Inventor 郑慧
Owner 杭州易辉环保科技有限公司
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