Incineration fly ash cement kiln synergic processing process

A technology of fly ash incineration and co-processing, applied in cement production and other directions, can solve problems such as improper disposal of heavy metals, and achieve the effect of avoiding high energy consumption

Active Publication Date: 2010-12-15
杭州易辉环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a co-processing process for incinerating

Method used

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  • Incineration fly ash cement kiln synergic processing process
  • Incineration fly ash cement kiln synergic processing process

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0020] Example 1:

[0021] The incineration fly ash of the circulating fluidized bed of a municipal solid waste incineration plant, the Cl element content is 3.20wt%, the Al 2 O 3 , CaO, SiO 2 , the contents were 23.19%, 10.95% and 42.22% respectively, accounting for 76.36% of the total.

[0022] About 1 t of fly ash and water per batch are mixed and stirred in the 1# water washing kettle according to the mass ratio of water-cement ratio of 3:1. After 10 minutes, the ash-water mixture is sent to the 1# belt filter press with a slurry pump. The fly ash filter cake is obtained by dehydration, and the fly ash filter cake is sent to the 2# washing kettle by the conveyor belt for the second washing operation with the same process parameters, and then the ash-water mixture is sent to the 2# belt filter press by the slurry pump. Dehydration, the filtrate of the 2# belt filter press is recycled for the washing process of the 1# washing kettle, and the fly ash filter cake is sent to...

Example Embodiment

[0023] Example 2:

[0024] The fly ash and water are mixed and stirred in the washing kettle for about 10 minutes according to the mass ratio of water-cement ratio of 10:1, and then left to settle for half an hour, so that the supernatant overflows to the waste water treatment tank; then add clean water to the washing kettle to The original water-cement ratio, after stirring and washing for about 5 minutes, the gray-water mixture is sent to the plate and frame filter press to be filtered by a slurry pump to obtain a fly ash filter cake. The moisture content of the fly ash filter cake is 30%, and the chlorine content down to 0.52wt%. The washing wastewater is passed into the flue gas of the cement kiln for acidification treatment. When the pH value reaches 6 to 9, a flocculant is added and stirred for 5 minutes, followed by flocculation and precipitation treatment to obtain wastewater treatment sediment. The fly ash filter cake and waste water treatment sediments are dehydrate...

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Abstract

The invention provides an incineration fly ash cement kiln synergic processing process comprising the following steps of: a, carrying out washing treatment on incineration fly ash twice to three times; b, dewatering the incineration fly ash subjected to the washing treatment in a dewatering device to obtain a fly ash filter cake, wherein the water ratio of the fly ash filter cake is 25-30 percent, and the concentration of chloride ions is 0.3-0.6 percent; c, processing washing waste water generated in the step a through a carbonization-coagulating sedimentation process to obtain waste water processing precipitates; d, mixing the waste water processing precipitates and the fly ash filter cake with cement raw materials in proportion, wherein obtained materials are used as production raw materials of cement clinker; and e, calcining the production raw materials of the cement clinker under the condition of high temperature of 1100-1450 DEG C. The incineration fly ash cement kiln synergic processing process has little energy consumption and can be used for efficiently treating heavy metal, overcomes the defect that a non-ferrous metal extraction technology can not eliminate organic pollutants contained in the fly ash and realizes the thorough harmlessness of the fly ash.

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 in a cement kiln after incineration fly ash containing heavy metals and dioxins is pretreated with water. Background technique [0002] With the rapid development of solid waste incineration, the output of incineration fly ash is increasing. If the stabilization and solidification pretreatment is carried out according to the national hazardous waste treatment requirements before safe landfill treatment, the existing hazardous waste safe landfills in Zhejiang can only serve for a few years, and the very scarce hazardous waste safe landfill resources will be exhausted. It is difficult to meet the actual demand, and it is indeed difficult to find new construction sites for hazardous waste safe landfills. As there is no proper treatment method at present, as a hazardous solid waste, th...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 郑慧
Owner 杭州易辉环保科技有限公司
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