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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: 2013-08-07
杭州易辉环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a co-processing process for incinerating fly ash cement kiln, which solves the problem of improper disposal of heavy metals in the prior art

Method used

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  • Incineration fly ash cement kiln synergic processing process

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Embodiment 1

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

[0022] Mix about 1 ton of fly ash and water in each batch according to the mass ratio of water-cement ratio of 3:1 in 1# washing kettle, and send the ash-water mixture into 1# belt filter press with slurry pump after 10 minutes The fly ash filter cake is obtained by dehydration, and the fly ash filter cake is sent to the 2# washing tank 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 with the slurry pump Dehydration, the filtrate of 2# belt filter press is circulated for the washing process of 1# washing kettle, and the fly ash filter cake is sent to the 3# washing kettle through the conveyor belt for the third...

Embodiment 2

[0024] Fly ash and water are mixed and stirred in the washing kettle according to the mass ratio of water-cement ratio 10:1, washed with water for about 10 minutes, 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, use the slurry pump to send the gray-water mixture into the plate-and-frame filter press to obtain the fly ash filter cake. The moisture content of the fly ash filter cake is 30%, and the chlorine element content down to 0.52wt%. The washing wastewater is passed into the tail gas of the cement kiln flue for acidification treatment, and when the pH value reaches 6-9, a flocculant is added and stirred for 5 minutes, and then the flocculation and sedimentation treatment is carried out to obtain the wastewater treatment sediment. Fly ash filter cake and wastewater treatment sediment ar...

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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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Patent Type & Authority Patents(China)
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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