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Sodium chloride and sodium sulfate mixed waste salt resource reutilization method

A sodium sulfate and sodium chloride technology, applied in chemical instruments and methods, alkali metal sulfite/sulfate purification, alkali metal sulfite/sulfate dehydration, etc., can solve large water consumption and high energy consumption , dealing with difficult issues

Pending Publication Date: 2021-09-10
浙江红狮环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above method and the prior art have complex treatment processes, and need to use adsorbents such as activated carbon to absorb organic matter to prevent nanofiltration membrane pollution, and the concentration of the salt solution is small, the amount of water used in the process is large, the energy consumption is high, and the treatment is difficult.

Method used

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  • Sodium chloride and sodium sulfate mixed waste salt resource reutilization method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for resource recycling of sodium chloride and sodium sulfate mixed waste salt, the scheme of which is:

[0029] Step 1. Co-processing: Mix 50kg of mixed waste salt with 0.1kg of cracking aid to obtain the mixed material, and send the mixed material into the pyrolysis equipment. The pyrolysis equipment is equipped with a heating layer and a material chamber, and the heating layer Connected with the cement kiln decomposition system, the heat of the cement kiln is introduced into the pyrolysis equipment to heat the mixed waste salt in the material room, firstly at 320°C for 20 minutes, then heated to 850°C, and the reaction time is 30 minutes; The material chamber is in the anaerobic heating state, and the flue gas and air produced by the organic matter are mixed according to the volume ratio of 0.8:0.8 and enter the cement kiln decomposition furnace through the pipeline, and enter the cement kiln waste gas system after being fully burned;

[0030] Step 2. Dissolu...

Embodiment 2

[0041] A method for resource recycling of sodium chloride and sodium sulfate mixed waste salt, the scheme of which is:

[0042] Step 1. Co-processing: mix 65kg of mixed waste salt with 0.3kg of cracking aid to obtain the mixed material, and send the mixed material into the pyrolysis equipment. The pyrolysis equipment is equipped with a heating layer and a material chamber, and the heating layer Connected with the cement kiln decomposition system, the heat of the cement kiln is introduced into the pyrolysis equipment to heat the mixed waste salt in the material room, firstly at 380°C for 30 minutes, then heated to 950°C, and the reaction time is 45 minutes; The material chamber is in the anaerobic heating state, and the flue gas and air produced by the organic matter are mixed according to the volume ratio of 0.8:0.95 and enter the cement kiln decomposition furnace through the pipeline, and enter the cement kiln waste gas system after full combustion;

[0043] Step 2. Dissoluti...

Embodiment 3

[0054] A method for resource recycling of sodium chloride and sodium sulfate mixed waste salt, the scheme of which is:

[0055] Step 1. Co-processing: mix 80kg of mixed waste salt with 0.6kg of cracking aid to obtain the mixed material, and send the mixed material into the pyrolysis equipment. The pyrolysis equipment is equipped with a heating layer and a material chamber, and the heating layer Connected with the cement kiln decomposition system, the heat of the cement kiln is introduced into the pyrolysis equipment to heat the mixed waste salt in the material room, firstly at 480°C for 40min, then heated to 1000°C, and the reaction time is 60min; The material chamber is in the anaerobic heating state, and the flue gas and air produced by the organic matter are mixed according to the volume ratio of 0.8:1.1 and enter the cement kiln decomposition furnace through the pipeline, and enter the cement kiln waste gas system after full combustion;

[0056] Step 2, dissolving treatmen...

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Abstract

The invention relates to the field of waste treatment, and discloses a sodium chloride and sodium sulfate mixed waste salt resource reutilization method which comprises the steps of co-treatment, dissolution treatment, nanofiltration membrane filtration, evaporative crystallization and the like. According to the method, the sodium sulfate body can be recycled, and organic matters contained in the waste salt can be fully utilized to burn to produce heat to supply energy to the cement kiln so that the aim of full resource utilization is fulfilled; according to the invention, the use amount of water in the process can be reduced, the energy consumption in the evaporative crystallization process is reduced, and the treatment cost is saved; according to the method, the organic matters in the waste salt are decomposed by fully utilizing heat generated by the cement kiln, then volatile organic matters generated by the decomposed organic matters are mixed with air along with flue gas and then enter the cement kiln to be fully combusted, heat is provided for the cement kiln, combustion is complete, harmless emission is achieved, and the purpose of green treatment is achieved.

Description

technical field [0001] The invention relates to the field of waste treatment, in particular to a resource recycling method for sodium chloride and sodium sulfate mixed waste salt. Background technique [0002] Because the waste salt slag often contains a variety of organic substances, the waste salt slag containing different organic substances shows different appearance colors, and emits various unpleasant smells at the same time, causing great harm to the environment and human physical and mental health. These organic impurities have brought great difficulties to the recycling of waste salt slag. At present, it is mainly collected and stored by units with landfill disposal qualifications for solidification and landfill treatment, and the treatment capacity is very limited. [0003] CN111498871A discloses a sodium sulfate and sodium chloride mixed waste salt slag treatment system and method. The treatment system includes a low-temperature anaerobic cracking furnace connected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C01D5/18C01D3/14B01D67/00B01D69/10B01D71/68
CPCC01D5/16C01D5/18C01D3/14B01D71/68B01D69/10B01D67/0093
Inventor 章小华李春萍唐柯赵正斌
Owner 浙江红狮环保股份有限公司
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