Method for recovering ammonium chloride in rare-earth ammonium salt wastewater to prepare agricultural chemical fertilizer

A technology for ammonium chloride and wastewater, applied in ammonium salt fertilizers, chemical instruments and methods, ammonium halide, etc., can solve the problems affecting the treatment of ammonia nitrogen wastewater and the difficulty of effectively selling ammonium salts, so as to improve fertilizer efficiency and achieve good market sales Effect

Inactive Publication Date: 2014-10-01
YANSHAN UNIV
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  • Application Information

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Problems solved by technology

Since the recovered ammonium chloride can only be sold as agricultural fertilizer, and agricultural production has less demand for a single ammonium chloride nitrogen fertilizer, it is difficult to effectively sell a large amount of recovered ammonium salt, which affects the treatment of ammonia nitrogen wastewater

Method used

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  • Method for recovering ammonium chloride in rare-earth ammonium salt wastewater to prepare agricultural chemical fertilizer

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Embodiment 1

[0026] A method of reclaiming ammonium chloride in rare earth ammonium salt wastewater to prepare agricultural chemical fertilizers, such as figure 1 As shown, firstly, 8% ammonium salt wastewater is pretreated by an activated carbon filter column to reduce the concentration of organic matter in the wastewater to 0.4mg / L. 12.5%, adjust the pH of the concentrated solution to 4, then enter the three-effect evaporation crystallizer to further concentration to 47%, then the concentrated slurry enters the cooling crystallization tank for cooling and crystallization, when the temperature reaches 27°C, start the centrifuge to recover ammonium chloride For solids, 60% of the mother liquor is used for granulation of organic and inorganic compound fertilizers, and the remaining 40% of the mother liquor is returned to the three-effect evaporation concentration device.

[0027] Activation treatment of phosphorus-containing waste residue from gelatin factory: place the phosphorus-containin...

Embodiment 2

[0032] The 6% ammonium salt wastewater is firstly pretreated by activated carbon filter column to reduce the concentration of organic matter in the wastewater to 0.5mg / L, and then enters the electrodialysis device after being filtered by the security filter device to increase the concentration of ammonium chloride in the wastewater to 11%. The pH of the concentrated solution is adjusted to 4, and then enters the three-effect evaporation crystallizer to further increase the concentration to 46%. Then the concentrated slurry enters the cooling crystallization tank for cooling and crystallization. When the temperature reaches 27°C, start the centrifuge to recover the ammonium chloride solid, 60 % of the mother liquor is used for the granulation of organic and inorganic compound fertilizers, and the remaining 40% of the mother liquor is returned to the three-effect evaporation concentration device.

[0033] Maturation of phosphorus-containing waste residues from gelatin factories: ...

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Abstract

The invention relates to a method for recovering ammonium chloride in rare-earth ammonium salt wastewater to prepare an agricultural chemical fertilizer, which mainly comprises the following steps: pretreating rare-earth ammonium salt wastewater with activated carbon, sending to an electrodialysis concentrator to enhance the concentration of wastewater ammonium salt to 10-13%, carrying out triple effect evaporation to enhance the concentration to 45-48%, cooling the concentrated slurry to crystallize, mixing with other three activated waste residues according to the ammonium salt mass concentration of greater than 60%, mixing uniformly, sending into a drum granulator with a belt conveyor, and spraying the ammonium salt mother solution for granulation, wherein the other three activated waste residues are a gelatin plant phosphorus-containing waste residue activation product, a power plant straw ash activation product and a weathered coal activation product. The method has the advantages of low treatment cost, no secondary pollution, simple fertilizer preparation technique and favorable fertilizer efficiency.

Description

technical field [0001] The invention belongs to the field of waste water treatment and resource recycling, in particular to a treatment method for rare earth ammonium salt waste water. Background technique [0002] my country is rich in rare earth resources, and most of the rare earth elements needed by the world are mined, smelted and separated in my country. However, in the rare earth mining and smelting process, various types of high-concentration polluted wastewater are discharged, such as acidic wastewater, fluorine-containing wastewater, radioactive element-containing wastewater, high-salt wastewater, high-concentration ammonia nitrogen wastewater, etc. Among these different types of wastewater, the pollution of ammonia nitrogen wastewater is the most prominent, with large water volume and high concentration of ammonia nitrogen. Ammonia nitrogen in rare earth smelting wastewater mainly exists in the form of ammonium chloride. Usually, the ammonium chloride concentrati...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/16C05C3/00C05G1/00C02F1/469C02F101/16
Inventor 黄海明丁丽
Owner YANSHAN UNIV
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