A method for preparing funnel-shaped sodium sulfate from high-salt wastewater

A high-salt wastewater, anhydrous sodium sulfate technology, applied in the preparation form of alkali metal sulfite/sulfate, chemical instruments and methods, alkali metal sulfite/sulfite, etc., to achieve uniform crystal particle size distribution, extended Residence time, the effect of increasing the specific surface area

Active Publication Date: 2021-05-25
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the focus of the method for preparing sodium sulfate from wastewater in the patent literature is still on the feasibility of the desalination process and the development of evaporation crystallization equipment, and there is no report on the morphology control of sodium sulfate

Method used

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  • A method for preparing funnel-shaped sodium sulfate from high-salt wastewater
  • A method for preparing funnel-shaped sodium sulfate from high-salt wastewater
  • A method for preparing funnel-shaped sodium sulfate from high-salt wastewater

Examples

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Effect test

Embodiment 1

[0033] Add 120mL of waste water (density 1.2g / mL) containing 28% (mass percent) sodium sulfate to a 150mL crystallizer, control the stirring rate to 200rpm, add sodium hydroxide to adjust the pH to 11, and heat to 80°C after constant temperature, Start to use negative pressure evaporation, the vacuum degree is controlled to 0.04MPa, and the evaporated water volume is 30mL. Then filter, place the wet solid phase at 105°C, and dry under normal pressure for 8 hours to constant weight to obtain a funnel-shaped sodium sulfate product. The moisture content of the product is 4.63%, and the purity is 98.45%. The photos of the product as a whole and the micrographs and electron micrographs of individual particles are as follows: figure 1 and figure 2 (The short line in the lower right corner of the figure indicates that the length is 200 μm, and the edge and endpoint of the funnel-shaped crystal are marked with a white dotted line and a white dot, respectively.) As shown, the product...

Embodiment 2

[0035] Add 120mL of waste water containing 28% (mass percent) sodium sulfate to a 150mL crystallizer, control the stirring rate to 100rpm, add sodium hydroxide to adjust the pH value to 14, heat to 50°C after constant temperature, start to use negative pressure evaporation, vacuum The degree of control is 0.07MPa, and the amount of distilled water is 35mL. After 50 seconds of filtration, the wet solid phase was completely placed at 105°C, and dried under normal pressure for 8 hours to constant weight to obtain a funnel-shaped sodium sulfate product. The moisture content of the product is 5.56%, the purity is 96.63%, the distribution range of the cone angle of the funnel is 120-150°, and the mass percentage of the product with a particle size ≥ 300 μm is 90.22%.

Embodiment 3

[0037] Add 120mL of waste water containing 30% (mass percent) sodium sulfate to a 150mL crystallizer, control the stirring rate to 400rpm, add sodium hydroxide to adjust the pH value to 12, heat to 60°C after constant temperature, start to use negative pressure evaporation, vacuum The degree of control is 0.05MPa, and the amount of distilled water is 30mL. Then filter, place the wet solid phase at 105°C, and dry under normal pressure for 10 hours to constant weight to obtain a funnel-shaped sodium sulfate product. The moisture content of the product is 7.03%, the purity is 95.88%, the distribution range of the cone angle of the funnel is 120-150°, and the mass percentage of the product with a particle size ≥ 300 μm is 91.35%.

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Abstract

The invention relates to a method for preparing funnel-shaped sodium sulfate from high-salt wastewater; heating the wastewater to 50-80°C, adding sodium hydroxide to adjust the pH of the wastewater to 11-14, and controlling the stirring rate to 100-400rpm; using negative pressure Evaporation and crystallization, the vacuum degree is 0.04-0.07MPa, until the volume of evaporated water is 20%-30% of the volume of the original wastewater; the obtained product is filtered and dried to obtain funnel-shaped anhydrous sodium sulfate crystals. The sodium sulfate product with funnel-shaped special crystal form is prepared, the cone angle of the funnel is 120°-150°, the purity of sodium sulfate is ≥95%, the particle size is large and evenly distributed, and the product particle size is ≥300 μm.

Description

technical field [0001] The invention relates to a process for crystallization and desalination of pharmaceutical wastewater mainly containing sodium sulfate, in particular to a funnel-shaped sodium sulfate that can be efficiently recovered from pharmaceutical wastewater and a preparation method thereof. Background technique [0002] Sodium sulfate (Sodium sulfate), chemical formula Na 2 SO 4 , also known as anhydrous Glauber's salt, as a common inorganic salt, its solubility shows a decreasing inverse solubility trend with the increase of temperature, and maintains a solid-liquid balance in the form of sodium sulfate decahydrate in a saturated aqueous solution at room temperature . Therefore, the industry usually adopts the mode of evaporative crystallization to make anhydrous sodium sulfate product. [0003] At present, the domestic production of sodium sulfate is mainly prepared through the comprehensive mining of sulfate mines and salt lake brine resources. At the sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00
CPCC01D5/004C01P2004/03C01P2004/60C01P2006/80
Inventor 龚俊波杨静朱培培侯宝红王召
Owner TIANJIN UNIV
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