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Process for treating and purifying waste sodium sulfate

A technology of waste sodium sulfate and process, which is applied in filtration treatment, alkali metal sulfite/sulfate purification, water/sewage treatment and other directions, can solve the problem of insufficient purity of waste sodium sulfate treatment products, and can meet the quality requirements and purity. High, reduced energy consumption and cost effects

Active Publication Date: 2022-04-29
陕西聚泰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a waste sodium sulfate treatment and purification process to solve the technical problem of insufficient purity of waste sodium sulfate treatment products in the prior art

Method used

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  • Process for treating and purifying waste sodium sulfate
  • Process for treating and purifying waste sodium sulfate
  • Process for treating and purifying waste sodium sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0060] This embodiment provides a kind of waste sodium sulfate treatment and purification with a refining device, such as figure 2 As shown, it includes a U-shaped molten salt furnace 3, a molten salt furnace kiln 4 is arranged outside the U-shaped molten salt furnace 3, and the feeding end of the U-shaped molten salt furnace 3 is connected in sequence through an airflow drying conveyor 5, a high-level silo 6 and the star feeder 7 transport the waste sodium sulfate to be treated, and the discharge end of the U-shaped molten salt furnace 3 is connected with a molten salt discharge pipeline 8;

[0061] The outlet of the molten salt discharge pipeline 8 delivers molten salt to the molten salt inlet of the cooling water tank 9; the discharge port of the cooling water tank 9 is connected to the crude brine storage tank 11 through the first feeding pump 10 to deliver crude brine, The crude brine storage tank 11 is connected to the crude brine high-level tank 14 through the second f...

Embodiment 2

[0073] This embodiment provides a kind of waste sodium sulfate treatment and purification system, such as Figure 1 to Figure 3 As shown, it includes a primary refining device 1 and a secondary refining device 2;

[0074] The primary refining device 1 adopts the primary refining device for waste sodium sulfate treatment and purification provided in Example 1.

[0075] The secondary refining unit 2 includes a plurality of resin exchange towers 25 which are mutually connected and independently arranged, and the primary refined brine storage tank 24 is independently connected to the liquid inlet at the top of each resin exchange tower 25 by the third feed pump 26 , the liquid outlet at the bottom of each resin exchange tower 25 is independently connected to the purified sodium sulfate solution pipeline 60.

[0076] As a preferred solution of this embodiment, multiple resin exchange towers 25 that can be connected to each other and independently set up are set in an operation mod...

Embodiment 3

[0110]This embodiment provides a kind of waste sodium sulfate treatment and purification process, and this process includes primary refining process and secondary refining process, and this process adopts the waste sodium sulfate treatment and purification system that provides in embodiment 2, and this system includes primary refining device 1 And the secondary refining device 2, the primary refining device 1 is used to realize the primary refining process, and the secondary refining device 2 is used to realize the secondary refining process.

[0111] The primary refining process is:

[0112] Step S11, performing molten salt treatment after the waste sodium sulfate to be treated is dried by hot air;

[0113] In step S11, the temperature of hot air drying is 80-100°C;

[0114] In step S11, the temperature of molten salt treatment is 884-900°C;

[0115] Step S12, adding the molten salt treated with molten salt in step S11 into water to cool to form crude brine, adding a floccu...

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Abstract

The invention provides a process for treating and purifying waste sodium sulfate. The process comprises the following steps: step S11, drying waste sodium sulfate to be treated by hot air, and then carrying out molten salt treatment; step S12, adding the molten salt subjected to the salt melting treatment in the step S11 into water, cooling to form crude brine, adding a flocculating agent into the crude brine, and then performing primary filtration to obtain primary filtrate; step S13, adding a sodium carbonate solution into the primary filtrate obtained in the step S12, performing precipitation in a precipitation tank, and then performing secondary filtration to obtain secondary filtrate; and step S14, adding a dilute sulphuric acid solution into the secondary filtrate obtained in the step S13 for neutralization to obtain a sodium sulfate aqueous solution after primary refining. The content of cations, except sodium ions, potassium ions and chloride ions, harmful to a bipolar membrane electrodialysis membrane in the sodium sulfate aqueous solution treated by the process disclosed by the invention can be reduced to below 1ppm, the content of anions including phosphate ions, silicate ions and other insoluble inorganic matters can be reduced to below 1ppm, and organic matters in the treated saline water are not detected.

Description

technical field [0001] The invention belongs to the technical field of recycling and utilization of chemical resources, and relates to waste sodium sulfate, in particular to a process for treating and purifying waste sodium sulfate. Background technique [0002] In chemical industry, hydrometallurgy and other industrial industries, a large amount of sodium sulfate by-products (including sodium sulfate decahydrate, commonly known as Glauber's salt, anhydrous sodium sulfate, commonly known as Yuanming powder) are produced every year. The impurities, especially toxic and harmful organic substances and heavy metal ions, greatly restrict the application of sodium sulfate as a product. Even with the stricter and stricter national environmental protection standards, waste sodium sulfate produced by some industries is listed as hazardous waste. Waste sodium sulfate is mainly produced from high-salt wastewater, and the treatment cost of high-salt wastewater is relatively high. There ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C02F9/04
CPCC01D5/16C02F9/00C02F1/001C02F1/5236C02F5/02C02F1/66C02F2001/425C02F1/44
Inventor 刘湛张明英程利山师谦刘广汉
Owner 陕西聚泰新材料科技有限公司
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