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Method for harmlessness and resource utilization of waste salts in chemical industry

A resourceful and chemical technology, applied in the direction of alkali metal chloride, etc., can solve the problems of loss of adsorption, complicated technical process, high treatment cost, etc., and achieve the effect of efficient removal, simple process and high dissolution efficiency

Inactive Publication Date: 2019-07-02
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0011] With this technology, relatively pure salt can be obtained, and the obtained salt can even be further processed into other chemical raw materials. It is an ideal method for resource utilization of waste salt, but the technical process reported so far is complicated and the treatment cost is high, especially for Waste salt with a high sodium chloride content, dissolved in water to form a salt solution containing a large amount of chloride ions will poison the resin, resulting in poor adsorption of organic matter, or even loss of adsorption, which also limits the removal of organic matter through resin adsorption. Industrial application of the technology of organic matter in water

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  • Method for harmlessness and resource utilization of waste salts in chemical industry

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Effect test

Embodiment 1

[0034] The waste salt residue precipitated from the three-effect evaporator of a fine chemical company, the waste salt is in the form of light yellow powder lumps. After testing, the waste salt contains 86.5% sodium chloride, 4.6% water, 1.2g of organic matter and other impurities. Salt is currently entrusted to the factory as hazardous waste for treatment and disposal.

[0035] Above-mentioned waste salt is processed according to the following steps of the present invention:

[0036] Step 1: Add water into the dissolution tank, set the ultrasonic working frequency to 30kHz, turn on the ultrasonic drive power supply, and continuously add waste salt to the water until the added salt does not dissolve. At this time, the dosage of salt can be It is considered to be close to the saturated dosage of sodium chloride, and the stirring is stopped to obtain coarse concentrated brine;

[0037] Step 2, sending the coarse concentrated brine obtained in step 1 into a filter device for pre...

Embodiment 2

[0042] The waste salt of a chemical enterprise is mainly composed of sodium chloride, which is light gray in color, consolidated into lumps and slightly viscous. After sampling and analysis, the components are as follows: sodium chloride 90.1%, moisture 7.6%, organic matter 1.05% and others Impurities.

[0043] Above-mentioned waste salt is processed according to the following steps of the present invention:

[0044] Step 1: Add water into the dissolution tank, set the ultrasonic working frequency to 20kHz, turn on the ultrasonic drive power supply, and continuously add waste salt to the water until the added salt does not dissolve. At this time, the dosage of salt can be It is considered to be close to the saturated dosage of sodium chloride, and the stirring is stopped to obtain coarse concentrated brine;

[0045] Step 2, sending the coarse concentrated brine obtained in step 1 into a filter device for preliminary filtration to remove insoluble substances in the concentrate...

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Abstract

The invention belongs to the field of hazardous waste treatment and disposal, and concretely discloses a method for harmlessness and resource utilization of waste salts in the chemical industry, usingsodium chloride as a main component. The method concretely comprises the following steps: a certain amount of chemical waste salts is taken, is placed in water, and is fully dissolved under the combined action of ultrasonication and stirring in order to obtain a salt solution A which is nearly saturated; the salt solution A is filtered to remove insoluble impurities in the salt solution A in order to obtain a salt solution B; the salt solution B is subjected to catalytic oxidation treatment to mineralize or decompose organic matters in the salt solution B into small molecular organic matters;the salt solution B is precisely filtered to obtain a salt solution C; and the salt solution C is spray-dried to make the small molecular organic matters in the salt solution C enter the gas phase with water vapor, and the obtained material is purified and discharged to obtain a dried sodium salt product. The method of the invention realize the harmlessness of the hazardous wastes such as chemical waste salts, and also allows the sodium salt byproduct which meets the quality requirements of the industrial product in order to achieve the harmlessness and resource utilization of the chemical waste salts.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and resource utilization, and in particular relates to a harmless and resource recovery method for waste salt in the chemical industry with sodium chloride as the main component. Background technique [0002] In recent years, cases of illegal disposal of hazardous waste have occurred frequently, which has aroused widespread concern from all walks of life. Many of these cases involved the disposal of hazardous waste in the chemical industry, especially waste residue and salt. This kind of waste has the characteristics of wide sources, various types, complex components, and high content of toxic and harmful substances. It is not only harmful to the environment, but also faces increasingly strict treatment and disposal requirements and environmental management policies. The treatment and disposal requirements and costs continue to increase, so it is difficult to deal with. It is very large a...

Claims

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Application Information

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IPC IPC(8): C01D3/04
CPCC01D3/04C01P2006/80
Inventor 李继洲王琳琳顾贺宋垠先韩孟雨
Owner HOHAI UNIV
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