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Treatment method of high concentration waste alkali solution

A waste lye, high-concentration technology, applied in the direction of pulping waste liquid combustion, etc., can solve problems such as waste and pollution

Active Publication Date: 2013-01-16
CHINA PETROCHEMICAL CORP
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Problems solved by technology

[0006] The purpose of the invention is to invent a new method for processing cyclohexanone saponification spent caustic soda and the method for processing the papermaking black liquor produced by the soda pulping process. The technical defect of flowing into the dissolution tank improves the safety of the technology, solves the environmental pollution and waste problems of alkaline water discharge, recycles the molten material, and realizes the renewable utilization of resources

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  • Treatment method of high concentration waste alkali solution

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Embodiment

[0033] The waste lye is processed by the above-mentioned alkali recovery method incineration technology, and the resulting smelt (mainly Na 2 CO 3) under high temperature, it slips out of the chute at the bottom of the furnace in a molten state at a temperature of 980°C. It enters the pulverization area of ​​the melt through the chute, and is cooled by the high-speed fluid ejected from the nozzle, broken into particles or powder, and the fluid pressure in front of the nozzle The fluid is a mixture of water flow, steam and compressed air, and the linear velocity of the high-speed fluid is 40m / s when it contacts the melt. The crushed crude alkali enters the guide tube with the fluid at a certain speed, is further cooled by the aqueous solution, and is carried into the scraper machine, and the solid phase is separated to obtain wet crude alkali; the water phase separated from the solid-liquid separation equipment Into an intermediate vessel such as a sink or tank, and recirculat...

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Abstract

The invention relates to a treatment method of a high concentration waste alkali solution. The method includes: spraying waste alkali into an alkali recovery furnace, using a fuel to support combustion, combusting the waste alkali in the presence of an oxygen-containing gas to generate steam as a by-product, conducting electric precipitation to recover dry alkali ash, and making a molten material formed in combustion flow out of a chute at the furnace bottom. The method is characterized by: using a nozzle to jet one or several bundles of high-speed fluids so as to impact, cool and break the molten material from the chute into granular or powdered coarse alkali; bringing the granular or powdered coarse alkali into a cylindrical pipeline, and making the coarse alkali enter solid-liquid separation equipment selected from a scraper or a screw conveyor under the driving of a water flow, and separating a solid phase so as to obtain moisture-containing coarse alkali; and bringing the water phase separated by the solid-liquid separation equipment into a trough, a water tank or other intermediate containers, and then performing pressurization to circulate the water phase to the cylindrical pipeline and the nozzle. The method provided in the invention has the advantages of being able to completely recover the molten material generated by waste alkali combustion and generating no wastewater, thus being able to be used for cyclohexanone and other chemical industrial production and having good environmental protection significance and economic benefits.

Description

technical field [0001] The invention relates to a treatment method for high-concentration waste lye, which belongs to the treatment and recycling of high-concentration waste liquid in chemical industry and papermaking production. Background technique [0002] At present, most of the cyclohexanone production on an industrial scale adopts the cyclohexane oxidation process. During the decomposition and saponification process, a large amount of high-concentration saponification waste lye is produced, with a COD of more than 300,000 mg / L and an output of >0.9 tons / ton Cyclohexanone. Before 2000, the harmless treatment of high-concentration saponification waste alkali was an important factor restricting the development of the cyclohexanone industry at home and abroad. Therefore, the cyclohexanone industry has reduced production or even shut down. With the development and improvement of waste alkali incineration treatment technology, Sinopec Baling Petrochemical Company, as a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/12
Inventor 陈立新尚希壮黎树根李常清
Owner CHINA PETROCHEMICAL CORP
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