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Process and system for treating waste salt slurry produced in production of sodium chlorate

A treatment process and treatment system technology, applied in the field of waste salt mud treatment process and system in sodium chlorate production, can solve the problems of excessive chromium content in waste salt mud, hard particles of waste salt mud, hidden safety hazards, etc., and achieve high Social and economic benefits, scientific and reasonable system design, no secondary pollution

Active Publication Date: 2018-01-16
中盐内蒙古化工钠业有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The patent No. CN101209873A "Chromium separation and recovery method containing hexavalent chromium waste residue" uses sodium carbonate or sodium bicarbonate as a mineralizer to increase Cr 6+ The dissolution rate, but the Cr in the waste salt mud 3+ Difficult to dissolve out, causing the total chromium content in the waste salt mud to exceed the standard
Notification number is CN105016387A patent "a kind of processing method of chromium salt mud", adopts adding oxidizing agent, leaching agent etc. to make the Cr in chromium salt mud 3+ Convert to Cr 6+ And dissolve to improve Cr 6+ The dissolution rate of the waste salt mud can improve the removal rate of chromium ions in the waste salt mud; but it has the following problems: 1. The waste salt mud particles are hard and difficult to dissolve, and it does not carry out any treatment on the waste salt mud. 3+ It is difficult to leach, and the treatment of chromium ions is not complete, and the total chromium content in the waste salt mud will still exceed the standard
2. Waste salt mud is produced by adding drugs to remove calcium ions, magnesium ions and sulfate ions in raw salt during the production of sodium chlorate, as well as perchlorate ions produced during electrolysis of sodium chlorate production. The waste salt mud treatment Finally, even if the dechroming solution is crystallized to remove sulfate, there are still a large amount of oxidants, leaching agents, reducing agents and other chemicals in the dechroming solution, as well as a large amount of perchlorate ions. If the liquid is directly returned to the chlorate production system, it will cause the enrichment of perchlorate ions in the sodium chlorate production system, which will seriously cause the system to explode, and there are extremely serious safety hazards; The agent contains more metal ions. Once metal ions such as barium ions enter the sodium chlorate production system, it will cause the anode of the electrolytic cell to fail. Excessive metal ions will increase the load on the sodium chlorate production system and affect the performance of the sodium chlorate production system. normal operation

Method used

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  • Process and system for treating waste salt slurry produced in production of sodium chlorate
  • Process and system for treating waste salt slurry produced in production of sodium chlorate
  • Process and system for treating waste salt slurry produced in production of sodium chlorate

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Embodiment 1

[0027] Such as figure 1 Shown, the processing system of waste salt mud in the production of sodium chlorate, it comprises grinder 1, oxidation stripping system, washing system, reduction system and waste water regulating tank 17, the outlet of grinder 1 and the oxidation stripping of oxidation stripping system The feed port of the reaction tank 2 is connected, the outlet of the water receiving tank 7 of the oxidation dissolution system is connected with the inlet of the reduction reaction tank 13 of the reduction system, and the liquid outlet of the reduction centrifuge 15 of the reduction system is connected with the water inlet of the waste water regulating tank 17 , the outlet of the wastewater regulating tank 17 is communicated with the incoming water pipeline 18 of the wastewater plant, the slag outlet of the oxidative dissolution centrifuge 6 of the oxidative dissolution system is communicated with the feed port of the slag collection tank 8 of the washing system, and the...

Embodiment 2

[0038] Utilize the processing technology of waste salt mud in the sodium chlorate production that embodiment 1 carries out, it comprises the steps: (1) waste salt mud grinding, (2) oxidation, (3) chromium ion stripping, (4) washing, (5) ) reduction; among them,

[0039] (1) Grinding of waste salt mud: Grinding the waste salt mud to 50 meshes to obtain abrasives; the purpose of grinding is to fully release the chromium ions wrapped in the waste salt mud to improve the efficiency of subsequent oxidation, dissolution and reduction.

[0040] (2) Oxidation: (1) After the waste salt mud is ground, mix the grinding material with water at a mass ratio of 1:0.5. Carry out the oxidation reaction under the conditions, the oxidant is permanganate, the mass ratio of the oxidant and the abrasive is 1:15, the oxidation reaction time is 2h, after the oxidation reaction ends, the oxidation slurry is obtained; the effect of oxidation is to convert the trivalent chromium ion The oxidant is oxid...

Embodiment 3

[0046] Utilize the processing technology of waste salt mud in the sodium chlorate production that embodiment 1 carries out, it comprises the steps: (1) waste salt mud grinding, (2) oxidation, (3) chromium ion stripping, (4) washing, (5) ) reduction; among them,

[0047] (1) Waste salt mud grinding: Grind the waste salt mud to 100 meshes to obtain abrasives; the purpose of grinding is to fully release the chromium ions wrapped in the waste salt mud to improve the efficiency of subsequent oxidation, dissolution and reduction.

[0048] (2) Oxidation: (1) After the waste salt mud is ground, mix the grinding material with water at a mass ratio of 1:1. The oxidation reaction is carried out under the conditions, the mass ratio of the oxidizing agent to the abrasive is 1:25, the oxidation reaction time is 0.5h, and the oxidizing agent is sodium peroxide. After the oxidation reaction is completed, the oxidation slurry is obtained; The oxidant is oxidized to hexavalent chromium ions, a...

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Abstract

The invention discloses a process and system for treating waste salt slurry produced in production of sodium chlorate. The process comprises the following steps: (1) grinding of the waste salt slurry;(2) oxidation; (3) dissolving of chromium ions; (4) washing; and (5) reduction. The system comprises a grinding machine, an oxidation and dissolution system, a washing system, a reduction system anda wastewater regulating tank. The invention has the following advantages: the chromium ions wrapped in the waste salt slurry are released through grinding and crushing and are then removed from the waste salt slurry through oxidation, dissolution, washing, reduction and other treatment of the waste salt slurry, so the problems of great difficulty in treatment of chromium ions in waste salt slurryand incomplete removal of the chromium ions are overcome; and the chromium content of dechromed filter residues obtained after the treatment is subjected to leaching toxicity testing according to thenational standard (HJ / T299-2007) in China, and results prove that the content of Cr<6+> in leachate is 0 mg / L, the content of total chromium is 2.4mg / l, reaching the environmental protection comprehensive utilization standard (HJ / T301 2007), a reductive detoxification rate is 99.5%, and the chromium content of the treated waste salt slurry is below national standards in China and meets national environmental protection emission standards.

Description

Technical field: [0001] The invention relates to the field of industrial waste treatment, in particular to a treatment process and system for waste salt mud in sodium chlorate production. Background technique: [0002] In the production process of sodium chlorate, in order to catalyze the main reaction, reduce the amount of oxygen generated, control the pH value in the electrolytic cell, and remove the perchlorate ions produced by the electrolytic reaction, sodium dichromate needs to be added to the system; the production per ton Sodium chlorate needs to add about 0.118kg of sodium dichromate. At the same time, in the production process of sodium chlorate, in order to remove calcium ions, magnesium ions and sulfate ions in the raw salt, it is necessary to add sodium hydroxide, sodium carbonate, calcium chloride to the production system, and remove calcium ions, magnesium ions and sulfate ions Ion precipitation; during this process, the chromium ions added in the production ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 杨富强王成军李海军骆秋福徐国庆孟晓亮鞠红艳程文吉赵杰田蕾段春霞谢英程贝任锦霞李霞白金香延凤英李斌葛豙林杨胜峰折文兰高娃王建恩
Owner 中盐内蒙古化工钠业有限公司
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