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Recycling processing technique for industrial wastewater from anhydrous sodium sulphate production

A technology for industrial wastewater and recycling treatment, applied in the directions of alkali metal sulfites/sulfites, alkali metal compounds, inorganic chemistry, etc., can solve the problems of difficult treatment of Yuanmingfen wastewater, and achieve the effect of saving energy consumption

Inactive Publication Date: 2016-12-14
四川省洪雅青衣江元明粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a recycling process for the industrial waste water in the production of sodium sulfate to solve the problem that the waste water produced in the production of sodium sulfate is difficult to handle

Method used

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  • Recycling processing technique for industrial wastewater from anhydrous sodium sulphate production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) first soak the Glauber's salt ore in water to obtain crude nitrate, and then put the crude nitrate into the crude nitrate pool,

[0019] (2) add caustic soda and soda ash to the thick nitric water in the crude nitric water pool, separate solid and liquid, obtain refined nitric acid water, and fine nitric acid water is squeezed into the refined nitric water pool,

[0020] (3) heating refined nitric water, crystallization obtains sodium sulfate product, and solid-liquid separation obtains waste residue and waste water,

[0021] (4) The waste residue is backfilled into the mine, and the waste water is returned to step (1) for flooding of Glauber's salt mine.

[0022] In the present invention, the hot wastewater after the crystallization of refined nitric acid is used to return to the leaching of Glauber's salt ore, realizing zero discharge of wastewater, and because the temperature of the wastewater is relatively high, it is more conducive to mineral leaching when used...

Embodiment 2

[0025] Such as figure 1 as shown,

[0026] (1) first soak the Glauber's salt ore in water to obtain crude nitrate, and then put the crude nitrate into the crude nitrate pool,

[0027] (2) add caustic soda and soda ash to the thick nitric water in the crude nitric water pool, separate solid and liquid, obtain refined nitric acid water, and fine nitric acid water is squeezed into the refined nitric water pool,

[0028] (3) Use the boiler to generate high-temperature steam to heat the refined nitric acid water, crystallize to obtain the sodium sulfate product, and separate solid and liquid to obtain waste residue and waste water,

[0029] (4) The waste residue is backfilled into the mine, and the waste water is returned to step (1) for flooding of Glauber's salt mine.

Embodiment 3

[0031] Such as figure 1 as shown,

[0032] (1) first soak the Glauber's salt ore in water to obtain crude nitrate, and then put the crude nitrate into the crude nitrate pool,

[0033] (2) add caustic soda and soda ash to the thick nitric water in the crude nitric water pool, separate solid and liquid, obtain refined nitric acid water, and fine nitric acid water is squeezed into the refined nitric water pool,

[0034] (3) Use the boiler to generate high-temperature steam to heat the refined nitric acid water, crystallize to obtain the sodium sulfate product, and separate solid and liquid to obtain waste residue and waste water,

[0035] (4) The waste residue is backfilled into the mine, the waste water is returned to step (1) for flooding of Glauber's salt ore, and the tail gas of the boiler is passed through the crude nitrate water to be used for heating the crude nitrate water in step (2).

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Abstract

The invention discloses a recycling processing technique for industrial wastewater from anhydrous sodium sulphate production. The technique comprises the following steps: (1) firstly soaking glauber salt ore in water, thereby acquiring rough liquid glauber salt; (2) adding caustic soda and sodium carbonate into the rough liquid glauber salt, thereby acquiring fine liquid glauber salt; (3) heating the fine liquid glauber salt, crystallizing for acquiring the anhydrous sodium sulphate powder product, and separating solid from liquid, thereby acquiring the waste residue and waste water; (4) backfilling the waste residue into a mining well and returning the waste water to the step of soaking sodium sulfafe decahydrate in water. According to the invention, the waste water and steam condensate after the fine liquid glauber salt is crystallized and subjected to solid and liquid separation are used for soaking the sodium sulfafe decahydrate, so that the zero emission of the waste water is realized. Besides, the waste heat of the flue gas of the boiler is utilized to heat the rough liquid glauber salt, so that the energy consumption is saved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a process for recycling industrial waste water produced by sodium sulfate. Background technique [0002] Yuanmingfen, white, odorless, bitter crystal or powder, hygroscopic. Appearance is colorless, transparent, large crystals or granular small crystals. Mainly used in the manufacture of water glass, glass, enamel, pulp, refrigerant mixture, detergent, desiccant, dye thinner, analytical chemical reagents, pharmaceuticals, feed, etc. [0003] In the production of sodium sulfate, a large amount of waste water is produced after the crystallization and separation of refined nitric water. The direct discharge of these waste water will lead to environmental pollution, and the purification treatment will take time and effort, resulting in increased costs. These wastewaters also contain part of uncrystallized Glauber's salt, which is directly discarded and leads to waste. ...

Claims

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Application Information

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IPC IPC(8): C01D5/00
CPCY02P20/129C01D5/00
Inventor 石兆亮张春太张云照
Owner 四川省洪雅青衣江元明粉有限公司
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