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Treatment method of crystalline material obtained through evaporation and concentration of vanadium oxide production wastewater

A technology for producing wastewater and evaporative concentration, which is used in chemical instruments and methods, alkali metal compounds, inorganic chemistry, etc.

Inactive Publication Date: 2012-07-25
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] As can be seen from the above description, the methods for removing ammonia from wastewater in the prior art have certain disadvantages, so a method that can stably and efficiently remove ammonia in wastewater is needed

Method used

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  • Treatment method of crystalline material obtained through evaporation and concentration of vanadium oxide production wastewater

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Embodiment 1

[0028] The crystallization (mainly containing NH 4 + 5.36%, Na + 19.10%, moisture 20.35%) are put into the tunnel kiln for roasting, and the temperature of tunnel kiln firing zone is 650 ℃, and the thickness of roasting material layer is no more than 2cm, and roasting time is 1 hour. The purity of the sodium sulfate product obtained after roasting is 96.12%, the content of ammonium sulfate in the product obtained after roasting is less than 0.1%, and the loss on ignition is about 38.68%.

[0029] In the present invention, the loss on ignition represents the mass loss percentage of the substance before and after the calcination process, that is, the loss on ignition=(mass before calcination−mass after calcination) / mass before calcination×100%.

Embodiment 2

[0031] The crystallization (mainly containing NH 4 + 5.36%, Na +19.10%, moisture 20.35%) are put into the tunnel kiln for roasting, and the temperature of tunnel kiln firing zone is 450 ℃, and the thickness of roasting material layer is no more than 2cm, and roasting time is 2 hours. The purity of the sodium sulfate product obtained after roasting is 95.07%, the content of ammonium sulfate in the product obtained after roasting is less than 0.1%, and the loss on ignition is about 35.23%.

Embodiment 3

[0033] The crystallization (mainly containing NH 4 + 6.97%, Na + 20.31%, moisture 10.52%) put into the drying drum and dry at 150°C for 1 hour. Then put the dried material into a tunnel kiln for firing. The firing zone temperature of the tunnel kiln is 650° C., the thickness of the firing material layer is not more than 2 cm, and the firing time is 1 hour. The purity of the sodium sulfate product obtained after roasting is 98.15%, the content of ammonium sulfate in the product obtained after roasting is less than 0.1%, and the loss on ignition is about 36.45%.

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Abstract

The invention provides a treatment method of crystalline material obtained through the evaporation and concentration of vanadium oxide production wastewater, wherein the main components of the crystalline material are sodium sulfate and ammonium sulfate. The treatment method is that the crystalline material is roasted to decompose ammonium sulfate, wherein the roasting temperature is 450-850 DEG C and the roasting time is 0.2-2 hours. According to the treatment method of the invention, ammonium sulfate and sodium sulfate can be easily separated.

Description

technical field [0001] The invention relates to a waste water treatment method, in particular to a treatment method for crystallized matter after waste water is evaporated and concentrated. Background technique [0002] At present, there are two main production processes of vanadium oxide in the world, and the raw material is mainly vanadium-titanium magnetite. Except for the calcification roasting-acid leaching-hydrolysis vanadium precipitation process (referred to as the lime method) in the Russian Tula plant, most vanadium production plants adopt the sodium roasting-water immersion-ammonium salt vanadium precipitation process (referred to as the sodium salt method). The vanadium products produced by this process are of high quality and stable production. Other manufacturers who use waste catalysts, petroleum slag, and vanadium-containing stone coal as raw materials also use ammonium salt vanadium precipitation to produce high-quality vanadium products, so NH 4 + High-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00
Inventor 洪俊辉郝建璋黎建明张金阳陈孝元黄新生刘昌林董智叶运高周琳李千文陈亮
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES