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Harmless treatment method for crystallized waste salt of coal chemical industry

A technology of harmless treatment and coal chemical industry, which is applied in the direction of solid waste removal, etc., can solve the problems of low treatment efficiency of salt washing method, large landfill method, low treatment efficiency, etc. The effect of shortening the time and speeding up the drying process

Inactive Publication Date: 2017-06-13
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The salt washing method has problems such as low treatment efficiency and easy to produce secondary pollution; the high temperature treatment method has problems such as high treatment temperature, high energy consumption, easy melting, and low treatment efficiency; the landfill method has the problems of occupying a large amount of land, Easy to precipitate and cause secondary pollution and other problems

Method used

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  • Harmless treatment method for crystallized waste salt of coal chemical industry
  • Harmless treatment method for crystallized waste salt of coal chemical industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Get 500g of crystalline waste salt from the circulating water system of a coal chemical enterprise and the reclaimed water system of a sewage treatment station (configure 20% aqueous solution, and the COD in the detection solution is 5800mg / L), and carry out batching preparation such as batching and coarse crushing Treatment to form granular substances; then preliminary drying treatment, the crystallized waste salt is placed in the drying yard for preliminary drying, the moisture content of the treated crystallized waste salt is <60%; the preliminary dried crystallized waste salt is placed in a vacuum stirring device In the process, dry for 30 minutes under the conditions of vacuum pressure 20kpa, drying temperature 80°C, and rotation speed 20r / min, and the water content of the treated crystallization waste salt is less than 20%; raise the temperature of the vacuum stirring device to 430°C, and maintain a vacuum pressure of 20kpa , the rotation speed is 20r...

Embodiment 2

[0030] Embodiment 2: Get 500g of crystalline waste salt from the circulating water system of a coal chemical enterprise and the reclaimed water system of a sewage treatment station (a 20% aqueous solution is configured, and the COD in the detection solution is 5800mg / L), and the batching preparation such as batching and coarse crushing is carried out. Treatment to form granular substances; then preliminary drying treatment, the crystallized waste salt is placed in the drying yard for preliminary drying, the moisture content of the treated crystallized waste salt is <60%; the preliminary dried crystallized waste salt is placed in a vacuum stirring device In the process, dry for 20 minutes under the conditions of vacuum pressure 20kpa, drying temperature 80°C, and rotation speed 20r / min, and the water content of the treated crystallized waste salt is less than 20%; raise the temperature of the vacuum stirring device to 430°C, and maintain a vacuum pressure of 20kpa , the rotation...

Embodiment 3

[0031] Embodiment 3: Get 500g of crystalline waste salt from the circulating water system of a coal chemical enterprise and the reclaimed water system of a sewage treatment station (a 20% aqueous solution is configured, and the COD in the detection solution is 5800mg / L), and the batching preparation such as batching and coarse crushing is carried out. Treatment to form granular substances; then preliminary drying treatment, the crystallized waste salt is placed in the drying yard for preliminary drying, the moisture content of the treated crystallized waste salt is <60%; the preliminary dried crystallized waste salt is placed in a vacuum stirring device In the process, dry for 30 minutes under the conditions of vacuum pressure 20kpa, drying temperature 80°C, and rotation speed 20r / min, and the water content of the treated crystallized waste salt is less than 20%; raise the temperature of the vacuum stirring device to 400°C, and maintain a vacuum pressure of 20kpa , the rotation...

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Abstract

The invention provides a harmless treatment method for crystallized waste salt of the coal chemical industry. The crystallized waste salt of the coal chemical industry is subjected to burdening and coarse crushing to form granular substances firstly; then preliminary drying treatment is conducted, and then the granular substances are placed into a vacuum stirring device and subjected to vacuum stirring drying for 20-30 min under the condition that the drying temperature is 60-80 DEG C; the temperature of the vacuum stirring device is promoted to be 400-430 DEG C, and constant-temperature stirring heating is conducted for 30-50 min, so that organics are gasified and volatilized after being cracked into small molecules, and organic salt and ammonium salt are decomposed; the crystallized waste salt after being subjected to vacuum heat treatment is taken out of the vacuum stirring device and formed into harmless salt after cooling; and volatile off-gas generated in the treatment process is discharged after standard treatment including condensation and activated carbon adsorption. According to the harmless treatment method for the crystallized waste salt of the coal chemical industry, poisonous harmful organic chemical substances in the crystallized waste salt of the coal chemical industry are volatilized into a gaseous state and effectively separated from solid salt, secondary pollution is avoided, the technique is simple and feasible, cost is low, and industrialization is easily achieved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of solid waste treatment, in particular to a harmless treatment method for coal chemical industry crystal waste salt. [0003] technical background: [0004] my country's coal chemical industry has developed rapidly in recent years. The waste water produced in this industry is large and difficult to handle. crystalline salt components, including refractory organics, often require disposal as hazardous waste to landfill. [0005] Coal chemical brine contains organic matter and salt compounds, COD is 500-10000mg / L, salt content is as high as 10000-100000mg / L, mainly containing Na + 、K + , Ca 2+ , Mg 2+ 、Al 3+ , Mn 2+ , SO 4 2－ , Cl － , NO 3 － , NO 2 － Plasma, where Na + The concentration reaches 10000~60000mg / L, Cl － The concentration can reach 10 000~50 000mg / L, SO 4 2－ The concentration is 5000~20000mg / L. Concentrated brine in coal chemical industry with high COD and high Na + , high...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 易师周艳张柏林
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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