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System and method for extracting potassium sodium salt from garbage incineration fly ash

A waste incineration fly ash, potassium and sodium technology, which is applied in the field of extraction of potassium and sodium salts, can solve the problems of not seeing the extraction of potassium and sodium salts, and achieve the effects of benefiting subsequent product development, reducing the use of labor, and high purity

Active Publication Date: 2011-08-24
BEIJING LIULIHE CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there is no relevant technical report on extracting potassium and sodium salts from waste incineration fly ash

Method used

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  • System and method for extracting potassium sodium salt from garbage incineration fly ash
  • System and method for extracting potassium sodium salt from garbage incineration fly ash
  • System and method for extracting potassium sodium salt from garbage incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] The steps of the process of washing the fly ash with dissolved salt are as follows:

[0048] A) Put water and the waste incineration fly ash in a mixing ratio of 2:1 into a water washing tank, stir and wash for 15 minutes, and then form a mixed slurry;

[0049] B) The mixed slurry obtained in step 1) is sent to a vacuum filter by a mud pump for filtration to obtain a filter cake with a water content of 25% and a filtrate containing salt; wherein, the filter cake is transported to a dryer by a belt for drying Afterwards stand-by; Send the salty filtrate into the reaction sedimentation tank in the filtrate precipitation treatment process to carry out precipitation treatment;

[0050] The steps of the filtrate precipitation treatment process are as follows:

[0051] C) Send the salt-containing filtrate into the reaction sedimentation tank, and at the same time add chemical agents to react with the filtrate to precipitate for 3 hours, and then separate the precipitate and ...

example 2

[0062] Fly ash washing dissolved salt process step is basically the same as example 1, and its difference is:

[0063] The weight ratio of water to waste incineration fly ash is 3:1; the stirring and washing time is 30 minutes;

[0064] The filtrate precipitation treatment procedure step is basically identical with example 1, and its difference is:

[0065] Add 80 grams of sodium sulfide and 210 grams of ferrous sulfate in every ton of salt-containing filtrate; the mass ratio of the added amount of 5% HCl solution to the supernatant is 1: 100.

[0066] Potassium sodium salt purification procedure step is basically identical with example 1, and its difference is:

[0067] Step 2) After the material entering the evaporator evaporates and absorbs heat, the temperature rises to 105°C, and then enters the flash crystallizer;

[0068] Step 3) The material entering the flash crystallizer evaporates instantly under the negative pressure environment of 0.05Mpa in the flash crystalliz...

example 3

[0071] Fly ash washing dissolved salt process step is basically the same as example 1, and its difference is:

[0072] The weight ratio of water to waste incineration fly ash is 2:1; the stirring and washing time is 20 minutes;

[0073] The filtrate precipitation treatment procedure step is basically identical with example 1, and its difference is:

[0074] Add 60 grams of sodium sulfide and 170 grams of ferrous sulfate in every ton of salt-containing filtrate; the mass ratio of the added amount of 5% HCl solution to the supernatant is 1:80.

[0075] Potassium sodium salt purification procedure step is basically identical with example 1, and its difference is:

[0076] Step 2) The temperature of the material entering the evaporator rises to 104°C after evaporating and absorbing heat, and then enters the flash crystallizer;

[0077] Step 3) The material entering the flash crystallizer evaporates instantly under the negative pressure environment of 0.03Mpa in the flash crystalli...

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Abstract

The invention discloses a system for extracting potassium sodium salt from garbage incineration fly ash and a method for extracting the potassium sodium salt by utilizing the system. The system comprises a fly ash washing and salt dissolution unit, a filtrate precipitation treatment unit and a potassium sodium salt purification unit, wherein the potassium sodium salt purification unit comprises a preheater as well as a NaCl crystallization treatment device and a KCl crystallization treatment device which are connected with the preheater in succession, and the NaCl crystallization treatment device and the KCl crystallization treatment device have a circulation loop structure respectively; the fly ash washing and salt dissolution unit is connected with the filtrate precipitation treatment unit through a vacuum filter arranged in the fly ash washing and salt dissolution unit; and the filtrate precipitation treatment unit is connected with the preheater of the potassium sodium salt purification unit through a water collection tank arranged in the filtrate precipitation treatment unit. The method comprises working procedures of fly ash washing and salt dissolution, filtrate precipitation treatment and salt extraction. By the method, wastes are changed into resources; the method is energy-saving and environment-friendly; the whole system is automatically controlled; the labor is saved; the purities of extracted NaCl crystallized salt and KCl crystallized salt are over 85 percent and 80 percent respectively; and the method benefits both people and country and is easy to popularize and implement.

Description

technical field [0001] The invention relates to the fields of hazardous waste treatment and resource utilization, in particular to 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. Background technique [0002] Due to the continuous development of cities, the amount of domestic waste has increased dramatically, which has become an important factor restricting urban development. Incineration is currently one of the most important means of dealing with municipal solid waste. According to the calculation that the amount of incineration fly ash is 3% of the amount of incineration waste, the resulting amount of waste incineration fly ash is also huge. my country is a country with relatively poor potassium resources. The production of domestic potassium salts is mainly extracted from salt lakes and seawater, and most of the others need to be imported from abroad. Research resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 赵向东周治平张国亮王树黄岚
Owner BEIJING LIULIHE CEMENT
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