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Method for recycling inorganic salt in municipal solid waste incineration fly ash

A technology of domestic waste incineration and inorganic salt, applied in the direction of calcium/strontium/barium halide, alkali metal chloride, calcium/strontium/barium chloride, etc. The problem of low product purity can achieve the effect of realizing high-value utilization, reducing waste of resources and improving economic benefits.

Active Publication Date: 2016-12-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the widespread adoption and promotion of municipal solid waste incineration methods, a large amount of incineration fly ash is produced, and the fly ash is enriched with toxic heavy metals and a large amount of soluble salts such as calcium, sodium, potassium, etc. The current treatment method of fly ash There are mainly cement solidification treatment methods, high temperature stabilization treatment, chemical agent stabilization treatment, etc. These methods stabilize heavy metals through curing agents and other reagents to make it difficult to dissolve heavy metals to achieve the purpose of stabilizing heavy metals, but the utilization rate of resources is low. Usable resources are not developed, resulting in a waste of resources, so the resource utilization of domestic waste incineration fly ash is imperative in our country
Invention patent CN102161490 discloses a system for extracting potassium and sodium salts from waste incineration fly ash and a method for extracting potassium and sodium salts using the system, and using the system to extract potassium chloride through processes such as washing dissolved salts, filtrate precipitation treatment, and salt extraction and sodium chloride, but the system is complicated, the energy consumption is high, and the product purity is not high. The purity of potassium and sodium is 85% and 80% respectively, and a large amount of calcium in the fly ash of domestic waste incineration has not been recovered, and the resource utilization is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh 600g of fly ash and 360g of water into a three-neck flask, place the flask in a super constant temperature water bath, control the reaction temperature to 25°C, control the stirring rate of 200 rpm and stir for 9h, then vacuum pump to make it solid-liquid Separated, and repeatedly washed the flask with the leaching solution to obtain 425g of the leaching solution 1, which contained KCl: 5.78%, NaCl: 7.01%, CaCl 2 : 3.43%, then weighed 708g fly ash and gained leaching solution 1 and carried out the same steps in a three-necked flask, stirred at 25°C for 9h, and separated solid and liquid to obtain 604g leaching solution 2, which contained KCl: 9.87%, NaCl : 10.30%, CaCl 2 :9.65%;

[0023] 2) The leaching solution 2 in step 1) was heated and evaporated to 109°C in an electric furnace at a rate of 1.2°C per minute, and 29g of sodium chloride was obtained after vacuum pump filtration, wherein KCl: 0.05%, NaCl: 96.78%, and 423g was obtained Mother liquor 1, which ...

Embodiment 2

[0031] 1) Weigh 600g of fly ash and 900g of water into a three-neck flask, place the flask in a super constant temperature water bath, control the reaction temperature to 40°C, control the stirring rate of 200 rpm and stir for 0.5h, then vacuum pump to filter to solidify The liquid was separated, and the flask was repeatedly washed with the leaching solution to obtain 1025g of the leaching solution 1, which contained KCl: 3.08%, NaCl: 3.70%, CaCl 2 : 3.03%, then weighed 683g fly ash and leaching solution 1 and carried out the same steps in a three-necked flask, stirred at 40°C for 0.5h, and separated solid and liquid to obtain 1098g leaching solution 2, which contained KCl: 6.02%, NaCl : 6.36%, CaCl2: 6.01%, then weigh 732g fly ash and leaching solution 2 and carry out the same steps in a three-necked flask, stir at 40°C for 0.5h, and separate solid and liquid to obtain 1208g leaching solution 2, which contains KCl : 8.78%, NaCl: 8.96%, CaCl2: 9.01%;

[0032] 2) Evaporate the...

Embodiment 3

[0040] 1) Weigh 600g of fly ash and 600g of water into a three-neck flask, place the flask in a super constant temperature water bath, control the reaction temperature to 90°C, control the stirring rate of 200 rpm and stir for 2 hours, then vacuum pump to filter to make it solid-liquid Separated, and repeatedly washed the flask with the leaching solution to obtain 696g of leaching solution 1, which contained KCl: 4.23%, NaCl: 5.61%, CaCl 2 :3.10%,

[0041] 2) The leaching liquid 1 obtained in step 1) was evaporated to 111°C at a rate of 1.2°C per minute on an electric furnace to obtain 25g of sodium chloride, wherein KCl: 0.05%, NaCl: 96.54%, and 390g of mother liquor 1 , which contains KCl: 7.43%, NaCl: 3.81%, CaCl 2 : 5.53%;

[0042] 3) Evaporate the mother liquor 1 in step 2) on the electric furnace at a rate of 1.2°C per minute, stop evaporating when the temperature rises to 116°C, stir and cool the feed liquid (cooling water containing ice cubes) to 0°C, solidify Liqui...

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Abstract

The invention discloses a method for recycling inorganic salt in municipal solid waste incineration fly ash. The method includes the steps of firstly, extracting fly ash multiple times to improve the concentration of an extraction solution; secondly, through the design of the evaporation step, separating out sodium chloride, separating out potassium chloride and sodium chloride through evaporation and separating out calcium chloride through evaporation to extract all main inorganic salt including calcium salt; thirdly, recycling a mother solution in the extraction process to avoid secondary pollution. Energy consumption in the evaporation process is reduced, high-purity potassium chloride, sodium chloride and calcium chloride are obtained, and the resourceful utilization of fly ash is achieved.

Description

technical field [0001] The invention relates to the field of resource utilization of fly ash, in particular to a method for recovering inorganic salt from fly ash. Background technique [0002] With the widespread adoption and promotion of municipal solid waste incineration methods, a large amount of incineration fly ash is produced, and the fly ash is enriched with toxic heavy metals and a large amount of soluble salts such as calcium, sodium, potassium, etc. The current treatment method of fly ash There are mainly cement solidification treatment methods, high temperature stabilization treatment, chemical agent stabilization treatment, etc. These methods stabilize heavy metals through curing agents and other reagents to make it difficult to dissolve heavy metals to achieve the purpose of stabilizing heavy metals, but the utilization rate of resources is low. Usable resources can not be developed, resulting in a waste of resources, so the resource utilization of domestic was...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01F11/24
CPCC01D3/04C01F11/24C01P2006/80
Inventor 袁俊生郭小甫赵颖颖李非王军纪志永刘杰王士钊谢英惠李亚宁范庆玲张成凯
Owner HEBEI UNIV OF TECH
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