A water washing method for synchronous calcium fixation and dechlorination of waste incineration fly ash

A technology of waste incineration fly ash and fly ash, which is applied in the removal of solid waste and other directions, can solve the problems of restricting the disposal and utilization of waste salt, low decalcification efficiency, difficult separation of heavy metals, etc., and achieves the effect of reducing concentration and processing pressure.

Active Publication Date: 2022-05-10
浙江初晓环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decalcification efficiency of the current washing waste liquid is low, resulting in a high calcium impurity content in the waste salt produced by evaporation and crystallization
At the same time, the heavy metals contained in the crystallized waste salt are difficult to separate, thus limiting the further disposal and utilization of the waste salt

Method used

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  • A water washing method for synchronous calcium fixation and dechlorination of waste incineration fly ash
  • A water washing method for synchronous calcium fixation and dechlorination of waste incineration fly ash
  • A water washing method for synchronous calcium fixation and dechlorination of waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Effect of molar ratio of sodium phosphate and sodium silicate on fly ash calcium solidification rate, heavy metal leaching reduction percentage, and chlorine elution rate

[0024] Disposal process of the present invention: according to sodium phosphate and sodium silicate molar ratio 0.5:10, 0.7:10, 0.9:10, 1:10, 2.5:10, 4:10, 4.5:10, 5:10, 6:10 respectively Sodium phosphate and sodium silicate were weighed and mixed to obtain nine groups of phosphorus silicon additives. According to the mass ratio of phosphorus-silicon additive and waste incineration fly ash of 2:100, the phosphorus-silicon additive and waste incineration fly ash were weighed and mixed to obtain nine groups of silicon-doped phosphorus fly ash. According to the liquid-solid ratio of 0.3:1, water and silicon-phosphorus-doped fly ash were weighed, mixed, stirred continuously for 1 hour, and left to age for 12 hours to obtain nine groups of calcium-fixed fly ash slurries. The calcium-fixed fly a...

Embodiment 2

[0042] Example 2 Effect of mass ratio of phosphorus silicon additive to waste incineration fly ash on fly ash calcium solidification rate, heavy metal leaching reduction percentage, and chlorine elution rate

[0043] Weigh sodium phosphate and sodium silicate respectively according to the molar ratio of sodium phosphate and sodium silicate of 4:10, and mix them to obtain the phosphorus silicon additive. Weigh phosphorus according to the mass ratio of phosphorus silicon additive to waste incineration fly ash 1:100, 1.5:100, 1.8:100, 2:100, 11:100, 20:100, 21:100, 23:100, 25:100 The silicon additive is mixed with waste incineration fly ash to obtain nine groups of silicon-phosphorus-doped fly ash. Water and silicon-phosphorus-doped fly ash were weighed according to the liquid-solid ratio of 0.6:1, mixed, stirred continuously for 3.5 hours, and left to age for 30 hours to obtain nine groups of calcium-fixed fly ash slurry. The nine groups of calcium-fixing fly ash are introduced...

Embodiment 3

[0052] Example 3 Effect of aging time on fly ash calcium solidification rate, heavy metal leaching reduction percentage, and chlorine elution rate

[0053] Weigh sodium phosphate and sodium silicate respectively according to the molar ratio of sodium phosphate and sodium silicate of 4:10, and mix them to obtain the phosphorus silicon additive. The phosphorus-silicon additive and the waste incineration fly ash were weighed and mixed according to the mass ratio of the phosphorus-silicon additive to the waste incineration fly ash of 20:100 to obtain the silicon-doped phosphorus fly ash. Weigh water and silicon-phosphorus-doped fly ash according to the liquid-to-solid ratio of 0.9:1, mix them, stir continuously for 6 hours, leave to stand and age for 6 hours, 8 hours, 10 hours, 12 hours, 30 hours, 48 ​​hours, 54 hours, 60 hours and 66 hours respectively to obtain calcium-fixed fly ash. mortar. The calcium-fixing fly ash slurry is introduced into a centrifuge for solid-liquid sepa...

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Abstract

The invention discloses a method for simultaneous solid calcium dechlorination and water washing of waste incineration fly ash. The method mixes sodium phosphate and sodium silicate to prepare phospho-silicon additives, mixes waste incineration fly ash and water, continuously stirs, and is left to stand for aging. , solid-liquid separation to obtain solid calcium dechlorination fly plaster. This method is a new idea of ​​washing waste incineration fly ash, which can not only achieve efficient dechlorination of waste incineration fly ash, but also significantly reduce the concentration of heavy metals and calcium ions in the fly ash washing solution, thereby reducing the downstream fly ash washing wastewater treatment pressure. Up to 96% of chlorine in waste incineration fly ash can be removed, up to 98% of calcium can be trapped in the washed solid calcium dechlorination fly ash, and up to 99% of heavy metal leaching can be reduced in the washing wastewater.

Description

technical field [0001] The invention relates to a method for simultaneous calcium fixation, dechlorination and water washing of garbage incineration fly ash, which belongs to the field of harmless disposal and resource utilization of hazardous waste. Background technique [0002] Waste incineration fly ash refers to the particulate matter produced by condensation or chemical reaction of heavy metals and inorganic salts volatilized under high temperature conditions in the process of waste incineration. Waste incineration fly ash is still listed in the "Hazardous Waste Catalog" (2021 edition). Waste incineration fly ash not only contains heavy metals and dioxin pollutants, but also contains 5% to 25% chlorine. Generally, the chlorine content in grate furnace fly ash is significantly higher than that in fluidized bed fly ash. At present, the most important resource products of waste incineration fly ash include cement, glass body and ceramsite. However, cement, glass and cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B3/38B09B3/70
CPCB09B3/00
Inventor 黄涛宋东平张树文周璐璐徐娇娇
Owner 浙江初晓环境科技有限公司
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