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Waste salt recycling process and special device thereof

A special device and resource-based technology, used in transportation and packaging, chemical instruments and methods, and solid waste removal, etc., can solve the problems of continuous and stable operation of equipment bonding, poor temperature control, etc. Uniformity, high purity, and the effect of preventing the leakage of furnace gas

Inactive Publication Date: 2017-11-07
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to poor temperature control during the operation of this method, the surface of the waste salt in some parts of the equipment will soften, making it difficult for the equipment to bond continuously and stably.

Method used

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  • Waste salt recycling process and special device thereof

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Experimental program
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Effect test

Embodiment 1

[0036] The components of waste salt produced by a pesticide and pharmaceutical intermediate manufacturer are NaCl 97%, water 1.74%, benzoic acid 0.23%, 3,4-dichloro-5-carboxylate sodium isothiazole 0.12%, p-toluenesulfonic acid 0.21%, ammonia solution 0.35%, toluene 0.35%. The main operating technical parameters of the equipment and process are: the control temperature of the molten salt furnace is: drying, preheating section 200°C, melting section 850°C, molten salt dripping section 1000°C, molten salt collecting section 900°C, waste salt in the furnace The residence time is 8S; the outlet temperature of molten salt furnace tail gas is 200°C, the temperature of RTO furnace inlet air is 50°C, the temperature of organic waste gas incineration chamber is 800°C, the temperature of exhaust gas from RTO furnace is 100°C, and the exhaust temperature of chimney exhaust gas after passing through the alkali washing tower is 40°C. After purification by the molten salt furnace, the NaCl...

Embodiment 2

[0038] The composition of waste salt produced by a pigment production enterprise is 94.86% of sodium sulfate, 1.74% of 1,4-diaminoanthraquinone, 1.21% of 1,4-dihydroxyanthraquinone, and 2.19% of other organic impurities. The main operating technical parameters of the equipment and process are: the control temperature of the molten salt furnace is: drying, preheating section 250°C, melting section 900°C, molten salt dripping section 1050°C, molten salt collecting section 920°C, waste salt in the furnace The residence time is 10S; the outlet temperature of molten salt furnace tail gas is 200°C, the temperature of RTO furnace inlet air is 50°C, the temperature of organic waste gas incineration chamber is 800°C, the temperature of exhaust gas from RTO furnace is 100°C, and the exhaust temperature of chimney exhaust gas after passing through the alkali washing tower is 40°C. After purification by the molten salt furnace, the sodium sulfate content of the net salt is 100%, and TOC (...

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Abstract

The invention discloses a waste salt recycling process and a special device thereof. According to the process, a waste salt supply system, a waste salt melting system, a tail gas treatment system and a molten salt cooling and pelleting system are included. The special device comprises a waste salt feeder, a waste salt distributor, a drying, preheating and melting integrated salt-melting furnace, a belt cooling and pelleting machine, an RTO furnace, a filter, a fire arrester, an alkaline washing tower and the like. By means of the waste salt recycling process and the special device thereof, organic matter in waste salt is completely burnt out, the recycling standard is met, organic matter generated in the purifying process of waste salt is further treated in a thermal destruction mode, and emission of secondary pollutants like waste water and waste gas in the utilization process of the waste salt is avoided. Meanwhile, the vertical salt-melting furnace is adopted, the waste salt drying, preheating and melting processes are achieved in the furnace, high investment and waste gas pollution caused by equipment units for drying, grinding and the like are reduced, and the problem that it is difficult for the device to operate continuously and stably due to salt adhesion is solved.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal in environmental protection technology, and relates to a waste salt recycling process and a special device thereof, in particular to a method and a device for purifying waste salt by removing organic matter in waste salt by high-temperature melting method, which is applied to Recycling of waste salt produced in the fine chemical production process. Background technique [0002] Waste salt mainly comes from fine chemical fields such as pesticides, pharmaceuticals, printing and dyeing. In 2015, the national chemical industry produced about 3 million tons of waste salt. The concentration of high-salt wastewater generated in the production processes of fine chemical acid-base neutralization, salting-out and color fixation will produce sodium chloride, sodium sulfate, sodium sulfite, sodium nitrate, potassium chloride, potassium sulfate, calcium chloride, A mixture of one or more salts an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/20B09B3/40
Inventor 李国平朱增银包健杨振亚王昱刘伟周海云王伟霞
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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