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Resource treatment method for sodium chloride waste salt in process of dye production

A treatment method and technology in the production process, which is applied in the field of recycling sodium chloride waste salt in the dye production process, can solve the problems of unintroduced sodium chloride salt, inability to remove organic matter, and affecting yield and purity, etc. Small land, easy control of operating conditions, and the effect of saving production costs

Inactive Publication Date: 2018-12-04
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent application CN201711084635.4 discloses a kiln and method for incinerating waste sodium chloride salt, which adds a dioxin removal chamber, but does not introduce the incinerated sodium chloride salt
And the high temperature treatment method is difficult to solve the problem of salt ringing and agglomeration at high temperature
[0006] The soda ash method is to make the waste salt into a saturated salt solution, pass ammonia gas, carbon dioxide or directly add solid ammonium carbonate under certain conditions, and then decompose the obtained ammonium bicarbonate at a high temperature to obtain soda ash and ammonium chloride. However, The organic matter in it cannot be removed, which affects the yield and purity, and the process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The sodium chloride waste salt produced in the dye production process of a company in Jiangsu contains about 85% sodium chloride, about 10% phenolic organic matter, and 5% water.

[0034] (1) Feed the waste salt into the drying chamber of the anaerobic cracking furnace, dehydrate and dry it at 200°C for about 1 hour, then transport it to the cracking anaerobic cracking furnace, pyrolyze it at 350°C for 1 hour, and then carbonize it at 550°C 3 hours, and then enter the cooling kiln for cooling and standby. The whole process is carried out in an oxygen-free environment.

[0035] (2) the salt in the step (1) is mixed with the sodium chloride salt solution of mass concentration 20%, after the sodium chloride salt is all dissolved, press filter with 800 mesh filter cloths, remove carbonized particles and obtain purified sodium chloride saline solution.

[0036] (3) Add the salt solution obtained in step (2) to the initial material chamber, add pure water to the acid chamber...

Embodiment 2

[0041]The sodium chloride waste salt produced in the dye production process of a company in Jiangsu contains about 75% sodium chloride, 17% phenolic organic matter and 8% water.

[0042] (1) Feed the waste salt into the drying chamber of the anaerobic cracking furnace, dehydrate and dry it at 200°C for about 2 hours, then transport it to the pyrolysis and carbonization anaerobic cracking furnace, pyrolyze it at 400°C for 2 hours, and then dehydrate it at 600°C Carbonize for 2 hours, and then enter the cooling kiln to cool and set aside.

[0043] (2) The salt in the step (1) is formulated into a sodium chloride salt solution with a mass concentration of 20%. After the sodium chloride salt is completely dissolved, an air flotation device is added to remove carbonized particles to obtain a purified sodium chloride salt solution.

[0044] (3) Add the salt solution obtained in step (2) to the initial material chamber, add pure water to the acid chamber and the alkali chamber respec...

Embodiment 3

[0049] The sodium chloride waste salt produced in the dye production process of a company in Zhejiang contains about 80% sodium chloride, about 13% phenolic organic matter, and 7% moisture.

[0050] (1) Feed the waste salt into the drying chamber of the anaerobic cracking furnace, dehydrate and dry it at 200°C for about 2 hours, then transport it to the cracking anaerobic cracking furnace, pyrolyze it at 400°C for 2 hours, and then carbonize it at 600°C 2 hours, and then enter the cooling kiln to cool and set aside.

[0051] (2) the salt in the step (1) is mixed with the sodium chloride salt solution of mass concentration 20%, after the sodium chloride salt is all dissolved, filter with 800 purpose filter cloths, obtain the sodium chloride salt solution of purification.

[0052] (3) Add the salt solution obtained in step (2) to the initial material chamber, add pure water to the acid chamber and the alkali chamber respectively, and the volume ratio of the salt solution to the ...

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Abstract

The invention discloses a resource treatment method for a sodium chloride waste salt in the process of dye production. The method comprises the steps: in an oxygen-free environment and under differenttemperature conditions, removing water in the waste salt, gasifying small-molecule organic matter, splitting aromatic ring substances, carbonizing naphthalene, anthracene and fused ring substances, then dissolving the obtained salt, removing carbonized particles so as to a purified sodium chloride solution, and performing bipolar membrane electrolysis on the obtained sodium chloride solution so as to prepare a sodium hydroxide solution and dilute hydrochloric acid. The whole treatment process is simple, efficient, economical and feasible, and meanwhile resource recovery and utilization of thesodium chloride waste salt, the split small-molecule organic matter and carbonized product are realized.

Description

technical field [0001] The invention belongs to the technical field of resource recycling of inorganic salts, in particular to a resource recycling method for sodium chloride waste salt in the dye production process. Background technique [0002] In the production process of dyestuffs, various waste waters are produced, which pollute the environment seriously and are difficult to deal with. With the increasing intensity of comprehensive pollution control by the national environmental protection department, many polluting manufacturers are facing the problem of producing sewage handling problems. [0003] The main wastewater of the dye industry includes colored wastewater containing salt and organic matter, and the concentration of inorganic salt is 5% to 15%, mainly sodium chloride. For the treatment of sodium chloride industrial waste salt containing organic matter, the common methods are: solvent washing method, high temperature treatment method and soda ash method. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00B01J20/20B01J20/34B01D61/14C25B1/26
CPCB01D61/145B01J20/20B01J20/3416B01J20/3483C10B53/00C25B1/265
Inventor 杨迪迪陈磊吕伏建
Owner ZHEJIANG QICAI ECO TECH CO LTD
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