Pretreatment method for cooperatively treating fly ash by cement kiln

A co-processing and cement kiln technology, applied in cement production, etc., can solve problems affecting the normal operation of evaporation and crystallization equipment, increase the cost of hardening of water washing liquid treatment, and adverse effects of cement production process, so as to improve the significance of resource utilization and increase resource utilization. The effect of globalization advantages and long-term promotion value

Active Publication Date: 2019-05-14
北京精刻环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high chlorine content in fly ash will adversely affect the cement production process and requires washing pretreatment
[0005] At present, in the process of washing fly ash, a large amount of calcium is also eluted at the same time as dechlorination, which increases the cost of hard removal in the treatment of washing liquid, and also affects the normal operation of evaporation crystallization equipment

Method used

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  • Pretreatment method for cooperatively treating fly ash by cement kiln
  • Pretreatment method for cooperatively treating fly ash by cement kiln
  • Pretreatment method for cooperatively treating fly ash by cement kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A technical method for strengthening calcium retention in the process of cement kiln co-processing fly ash water washing pretreatment, the operation steps include:

[0032] 1) Sodium hydroxide strengthens calcium preservation. After the fly ash and water are mixed, use a stirrer to stir and wash with water, and add a certain amount of sodium hydroxide during the stirring process.

[0033] In order to ensure this step 1), the following conditions need to be controlled: the water-cement ratio is 5mL / g, the washing time is 10min, the washing temperature is 20°C, and the ratio of sodium hydroxide to fly ash is 1g / 10g.

[0034] Before adding sodium hydroxide, the calcium content in the washed fly ash was 159.57g / kg; after adding sodium hydroxide, the calcium content in the washed fly ash was 185.73g / kg.

[0035] 2) Carbon dioxide strengthens calcium preservation. After step 1) is completed, carbon dioxide is introduced.

[0036] In order to ensure this step 2), the follow...

Embodiment 2

[0040] The fly ash used in the following experiments is 100g.

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Abstract

The invention discloses a pretreatment method for cooperatively treating fly ash by a cement kiln, and belongs to the technical field of fly ash pretreatment. Quantitative sodium hydroxide is firstlyadded in a fly ash washing and stirring process, then quantitative carbon dioxide is introduced, after water-ash mixed liquid is subjected to solid-liquid separation, the content of calcium in the pretreated fly ash is increased, the content of calcium in washing liquid is reduced, and meanwhile, the pH value of the washing liquid is adjusted.

Description

Technical field: [0001] The invention relates to the technical field of cement kiln co-processing fly ash pretreatment, in particular to a method for strengthening calcium retention in fly ash washing pretreatment. Background technique: [0002] With the acceleration of my country's industrialization process and the growth of population, the output of domestic waste has increased accordingly. Improper disposal of domestic waste will endanger human health and safety, and a large number of piles and landfills waste land resources. The waste incineration process can use the heat generated in the combustion process to generate electricity and realize its resource utilization. Garbage incineration can reduce the volume of garbage by 90% and the volume by 75%, and has become one of the mainstream technologies for domestic waste treatment. [0003] Fly ash is the residue collected by the flue gas purification system during the incineration of domestic garbage or hazardous waste. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/38C04B7/26C04B7/36
CPCY02P40/10
Inventor 陈震刘春慧刘磊
Owner 北京精刻环保科技有限公司
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