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Ammonium removal process of ammonium-containing waste water

A waste water and ammonium removal technology, which is applied in the direction of ammonium chloride, ammonium halide, water pollutants, etc., to achieve the effects of reducing treatment costs, reducing material quality, and reducing heat loss

Inactive Publication Date: 2019-04-23
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a deammonization process for ammonium-containing wastewater, which can solve the problem of impurity enrichment in the ammonium recovery process, and effectively reduce the treatment of ammonium-containing wastewater. cost

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  • Ammonium removal process of ammonium-containing waste water

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Embodiment 1

[0038] This embodiment discloses a process for removing ammonium from ammonium-containing wastewater. The ammonium-containing wastewater is vanadium-precipitated wastewater undergoing deep vanadium removal, and the vanadium-precipitated wastewater contains 200 g / L of sodium sulfate and 130 g / L of ammonium sulfate. , the vanadium precipitation wastewater enters the multi-effect evaporator, and evaporates to obtain sodium sulfate / ammonium sulfate crystals;

[0039] The content of sodium sulfate in sodium sulfate / ammonium sulfate crystals is 60%wt, and the content of ammonium sulfate is 40%wt;

[0040] Specifically, the deammonization process of the ammonium-containing wastewater, such as figure 1 Visible, including the following steps:

[0041] Mix the above crystals with sodium hydroxide powder, the mixing ratio is 1t:243Kg; the gas released during the mixing process is absorbed by sulfuric acid spray to obtain ammonium sulfate solution;

[0042] Send the mixed materials into...

Embodiment 2

[0046] This embodiment discloses a process for removing ammonium from ammonium-containing wastewater. The ammonium-containing wastewater is vanadium-precipitated wastewater undergoing deep vanadium removal. The vanadium-precipitated wastewater contains 150 g / L of sodium chloride and 150 g of ammonium chloride. / L, the vanadium precipitation wastewater enters the MVR evaporator, and evaporates to obtain sodium chloride / ammonium chloride crystals;

[0047] The sodium chloride content in the sodium chloride / ammonium chloride crystal is 51%wt, and the ammonium chloride content is 49%wt;

[0048] Mix the above-mentioned crystals and sodium carbonate powder in a ratio of 1t: 390Kg and put them into a sagger. The gas released during the mixing process is sprayed and absorbed by hydrochloric acid to obtain an ammonium chloride solution; push the sagger into a pusher kiln at 400°C , calcined for 1h;

[0049] Spray and absorb the tail gas produced by calcination with 3mol / L hydrochlori...

Embodiment 3

[0052] This embodiment discloses a process for removing ammonium from ammonium-containing wastewater. The ammonium-containing wastewater is vanadium-precipitated wastewater undergoing deep vanadium removal. The vanadium-precipitated wastewater contains 100 g / L of sodium sulfate and 250 g / L of ammonium sulfate. , enter the spray dryer, evaporate to obtain the crystal of sodium sulfate / ammonium sulfate;

[0053] The content of sodium sulfate in sodium sulfate / ammonium sulfate crystal is 29%wt, and the content of ammonium sulfate is 71%wt;

[0054] Mix the above-mentioned crystals and sodium carbonate powder in a ratio of 1t: 570Kg and put them into a stainless steel crucible. The gas released during the mixing process is sprayed and absorbed by sulfuric acid to obtain an ammonium sulfate solution; push the stainless steel crucible into a tunnel kiln at 500°C for calcination 0.5h;

[0055] Spray and absorb the tail gas produced by calcination with 4mol / L sulfuric acid to obtain ...

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Abstract

The invention provides an ammonium removal process of ammonium-containing waste water. The ammonium removal process comprises the following steps: drying the ammonium-containing waste water by distillation to obtain a mixture of ammonium salt and sodium salt; slowly mixing the mixture powder of the ammonium salt and sodium salt and alkali powder, absorbing the gas released during the reaction by virtue of acid to obtain an ammonium salt solution; heating and calcining a solid product obtained in the reaction, absorbing the gas released during the calcining by virtue of acid to obtain an ammonium acid solution, and crushing a calcined product to obtain a sodium salt. The ammonium salt solution obtained in the reaction is pure and can be returned to a vanadium deposition step to be used as an ammonium salt; and the sodium salt can be sold as a product. By adopting the ammonium removal process of the ammonium-containing waste water, the problem of impurity concentration in the ammonium recycling process can be solved, and the treatment cost of the ammonium-containing waste water can be effectively reduced.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to an ammonium removal process for ammonium-containing wastewater. Background technique [0002] At present, the general process of vanadium chemical production is: ammonium metavanadate or ammonium polyvanadate is obtained by ammonium salt precipitation method, the ammonium salt used is ammonium sulfate or ammonium chloride, and the wastewater produced by ammonium salt precipitation method contains sodium salt and Excessive ammonium salts, my country's environmental discharge standards have strict regulations on the concentration of ammonium and salt in wastewater, so the wastewater needs to be treated up to the standard before it can be discharged. The existing vanadium precipitation wastewater treatment methods: [0003] Scheme 1. Evaporate and crystallize the vanadium-precipitating wastewater. First, crystallize to obtain sodium sulfate or sodium chloride crystals. The remaining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/242C01D5/00C01D5/16C01C1/16C01D3/14C01D3/04C02F1/04C02F101/16
CPCC01C1/164C01C1/242C01D3/04C01D3/14C01D5/00C01D5/16C01P2006/80C02F1/04C02F1/043C02F2101/16
Inventor 陈彦博周振扬邸卫利邹振龙丁琳赵丹丹
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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