Method for preparing I-type snow melting agent from fly ash of waste

A technology of garbage fly ash and deicing agent, applied in chemical instruments and methods, other chemical processes, calcium carbonate/strontium/barium, etc., can solve the problem that chlorine salt cannot be treated economically, and achieve the effect of reducing treatment costs

Active Publication Date: 2019-04-05
杭州秀澈环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that a large amount of chlorine salts in fly ash cannot be treated economically, and to provide a method for preparing type I deicing agent using garbage fly ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing type I deicing agent by utilizing garbage fly ash, comprising the following steps:

[0026] (1) Water washing: Put the garbage fly ash into the washing tank for washing, and each washing is carried out under the condition of stirring and continuous air circulation. For each washing, the amount of water used is 1 times the weight of the garbage fly ash, and it is carried out after each washing. Solid-liquid separation, the solid is washed in water for the next time, a total of 3 times of water washing; the filtrate obtained from solid-liquid separation after combined water washing is processed in the next step; the escaped gas is collected above the water washing tank and enters the ammonia gas absorption tower for absorption to form ammonia water for reuse in the power plant Denitrification.

[0027] (2) Heavy metal removal: under stirring conditions, slowly add sodium sulfide solution (mass concentration 5%) to the filtrate obtained in the previo...

Embodiment 2

[0032] A method for preparing type I deicing agent by utilizing garbage fly ash, comprising the following steps:

[0033] (1) Water washing: Put the garbage fly ash into the washing tank for washing, and each washing is carried out under the condition of stirring and continuous air circulation. For each washing, the amount of water used is 3 times the weight of the garbage fly ash, and it is carried out after each washing. Solid-liquid separation, the solid is washed in the next water, a total of 2 times of water washing; the filtrate obtained from solid-liquid separation after combined water washing is processed in the next step; the escaped gas is collected above the water washing tank and enters the ammonia gas absorption tower for absorption to form ammonia water and reuse it to the power plant Denitrification.

[0034] (2) Heavy metal removal: under stirring conditions, slowly add sodium sulfide solution (mass concentration 2%) to the filtrate obtained in the previous ste...

Embodiment 3

[0039] A method for preparing type I deicing agent by utilizing garbage fly ash, comprising the following steps:

[0040] (1) Washing: Put the garbage fly ash into the washing tank for washing, and each washing is carried out under the condition of stirring and continuous air circulation. For each washing, the amount of water used is twice the weight of the garbage fly ash, and it is carried out after each washing. Solid-liquid separation, the solid is washed in water for the next time, a total of 3 times of water washing; the filtrate obtained from solid-liquid separation after combined water washing is processed in the next step; the escaped gas is collected above the water washing tank and enters the ammonia gas absorption tower for absorption to form ammonia water and reuse it to the power plant Denitrification.

[0041](2) Heavy metal removal: under stirring conditions, slowly add sodium sulfide solution (mass concentration 3%) to the filtrate obtained in the previous ste...

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Abstract

The invention discloses a method for preparing an I-type snow melting agent from fly ash of waste. The method includes the steps of washing with water, heavy metal removal, decolorization, calcium removal and evaporative crystallization, realizes harmless disposal of fly ash, recycles waste material, produces the I-type snow melting agent has good economic benefit, can also produce calcium carbonate or calcium sulfate, greatly reduces cost of fly ash disposal, causes no emission of waste water in treatment process, and is energysaving and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for preparing type I deicing agent by using garbage fly ash. Background technique [0002] With the rapid development of urbanization, the output of domestic waste in my country has increased year by year, from 189 million in 2013 to 206 million tons in 2015. The proportion of incineration disposal is increasing year by year. Fly ash is an inevitable product of waste incineration, accounting for about 3-5% of the amount of waste incinerated. According to this calculation, the fly ash produced by waste incineration nationwide will be 10,000-20,000 tons / day in the future. Such a large amount of fly ash is generated, making how to safely and effectively dispose of incineration fly ash has become an urgent environmental and social problem to be solved. [0003] Fly ash is the fine particulate matter collected in the flue gas purification system, including ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18C01F11/18C01F11/46
CPCC01F11/18C01F11/46C09K3/185
Inventor 丁仲军
Owner 杭州秀澈环保科技有限公司
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