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Waste salt resourceful treatment method

A treatment method and resource recovery technology, applied in the field of industrial waste salt resource recovery process, can solve problems such as low decomposition temperature, poor gas-solid contact, secondary pollution, etc., and achieve green harmless treatment and resource utilization technology, Solve the problem of secondary pollution, the effect of high decomposition temperature

Active Publication Date: 2021-02-05
绍兴凤登环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to low temperature, poor gas-solid contact, etc., the decomposition of organic matter is not complete, or carbon black is generated, which requires further refining, crystallization, etc.
The decomposition temperature of the above heat treatment processes is relatively low, mostly above 300°C and below 500°C, and this temperature is the temperature zone where dioxins are formed quickly, and there is a risk of secondary pollution

Method used

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  • Waste salt resourceful treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Concentrated brine produced from a pure water processing plant, wastewater with a total salt content of about 8%.

[0063] 2. Add raw coal and coal-water slurry additives made into small pieces of coal by rolling screens, crushers, etc., send them to a ball mill to grind them into liquid, stir through an underground tank in the middle, and pass through a vibrating screen to obtain a concentration of 50- The 75% coal-water slurry is transported to the finished product tank through the slurry pump, stirred and set aside.

[0064] 3. After the compressed oxygen is sprayed into the gasification furnace through a special nozzle together with the coal-water slurry, the gasification and cracking reaction is carried out under the conditions of 1350-1450 °C, 1.9-2.0 MPa high temperature and high pressure for 5 seconds to generate crude gas (CO , CO2, H2, N2 and H 2 Substances such as S can further produce hydrogen, CO 2 and other products), molten cinder ash, molten salt li...

Embodiment 2

[0069] 1. A production plant produces epichlorohydrin by the glycerin chlorination method, which produces a large amount of waste salt, which contains about 2% organic matter. Dissolve the waste salt in water and adjust the pH value to 7-10.

[0070] 2. Add raw coal and coal-water slurry additives made into small pieces of coal by rolling screens, crushers, etc., send them to a ball mill to grind them into liquid, stir through an underground tank in the middle, and pass through a vibrating screen to obtain a concentration of 50- The 75% coal-water slurry is transported to the finished product tank through the slurry pump, stirred and set aside.

[0071] 3. After the oxygen is compressed, it passes through a special nozzle together with the coal-water slurry, and is sprayed into the gasification furnace, and the gasification and cracking reactions are carried out under the conditions of 1200-1300 ° C, 1.3 MPa high temperature and high pressure for 8 seconds to generate crude gas...

Embodiment 3

[0076] 1. The saturated waste brine solution obtained from a certain PPS production plant, and the pH value is adjusted to 7-10.

[0077] 2. Add raw coal and coal-water slurry additives made into small pieces of coal by rolling screens, crushers, etc., send them to a ball mill to grind them into liquid, stir through an underground tank in the middle, and pass through a vibrating screen to obtain a concentration of 50- The 75% coal-water slurry is transported to the finished product tank through the slurry pump, stirred and set aside.

[0078] 3. After the oxygen is compressed, it passes through a special nozzle together with the coal-water slurry, and is sprayed into the gasification furnace, and the gasification and cracking reactions are carried out under the conditions of 1250-1350 ° C, 4.0 MPa high temperature and high pressure for 6 seconds to generate crude gas (CO, CO2 , H2, N2 and H 2 S and other substances, raw material gas for the synthesis of methanol), molten cind...

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Abstract

The invention provides a waste salt resourceful treatment method which comprises the following steps: mixing waste salt with coal to form a coal salt mixture, combusting the coal salt mixture in a coal gasifier, reacting for 2-10 seconds at the high temperature of 1,200-1,600 DEG C to generate a high-temperature mixture comprising raw gas, molten ash and a waste salt product, directly quenching with water, and further processing and utilizing the raw gas after quenching. The molten ash slag is solidified into crude slag in a vitreous state and can be used for cement ingredients. The waste saltproduct enters a water phase, and becomes normal pressure grey water after being subjected to temperature reduction, pressure reduction and filtration in a black water form, and the grey water is evaporated and crystallized to obtain regenerated sodium chloride. According to the method, the coal gasification process is utilized, the decomposition temperature is high and is 1200 DEG C or above, organic matters are thoroughly decomposed, then in the quenching process, dioxin and other substances can be effectively prevented from being generated, the crude water gas is used for further chemicalengineering utilization, waste gas emission is avoided, and therefore the secondary pollution problem in the industrial waste salt treatment process can be perfectly solved.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and recovery in the field of environmental protection management, and in particular relates to a process method for recycling industrial waste salt. Background technique [0002] With the continuous development of chemical industry, water treatment industry and other industries, the production of industrial slag salt is increasing day by day. With the gradual strengthening of environmental protection supervision, how to safely and effectively dispose of industrial slag and salt has become an important factor restricting the development of chemical and other enterprises. Industrial slag salt is a kind of salt slag containing sodium chloride slag salt, sodium sulfate slag salt, and their mixed salts, etc. It mainly comes from industries such as pesticides, medicine, and fine chemicals. In addition to the main components, the slag salt also has Contaminated with different organic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/08C04B7/24C10J3/46C10J3/48C10J3/72C10J3/82C10J3/84
CPCC01D3/08C04B7/24C10J3/46C10J3/48C10J3/72C10J3/82C10J3/84C01P2006/80C10J2300/0936C10J2300/0946C10J2300/0959C10J2300/1625C10J2300/1634C10J2300/1696Y02P40/10
Inventor 季根忠章磊王明霞陈永强张莉张浙锦
Owner 绍兴凤登环保有限公司
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