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Method for recycling ammonium chloride in APT (ammonium paratungstate) production process

A production process, ammonium chloride technology, applied in the direction of ammonium chloride, ammonium halide, etc., can solve the problems of large amount of alkali, can not meet the desorbent, low concentration of ammonium chloride, etc., to achieve the effect of improving efficiency and reducing consumption

Active Publication Date: 2018-11-02
江西铜鼓有色冶金化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the recovery of ammonium chloride, ammonia nitrogen wastewater is mainly activated with alkali first, and the amount of alkali used is relatively large, and the concentration of ammonium chloride obtained at the same time is not high, which cannot meet the needs of preparing desorbent

Method used

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  • Method for recycling ammonium chloride in APT (ammonium paratungstate) production process
  • Method for recycling ammonium chloride in APT (ammonium paratungstate) production process

Examples

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Embodiment 1

[0027] A method for recycling ammonium chloride in an APT production process, the specific steps are:

[0028] (1) In the clarifier, the concentration of ammonia nitrogen is 30g / L ammonia nitrogen wastewater 10m 3 Use 4kg of activated carbon for adsorption and pre-activation, and filter;

[0029] The activated carbon is pretreated, and the pretreatment method is as follows: 4kg of activated carbon is mixed with a sodium hydroxide solution with a concentration of 80g / L, treated at 50°C for 40 minutes, and filtered to obtain the product.

[0030] Wherein, gac and concentration are that the solid-liquid ratio of the sodium hydroxide solution of 80g / L is 1g:2ml;

[0031] (2) Pump the filtered waste water into the stirring tank, add 80g / L sodium hydroxide solution to activate ammonia, and adjust the pH value to 10-11;

[0032] The volume ratio of filtered waste water to sodium hydroxide solution is 100:8

[0033] (3) Introduce the ammonia gas produced by the waste water after am...

Embodiment 2

[0038] A method for recycling ammonium chloride in an APT production process, the specific steps are:

[0039] (1) In the clarifier, the concentration of ammonia nitrogen is 35g / L ammonia nitrogen wastewater 10m 3 Use 5kg of activated carbon for adsorption and pre-activation, and filter;

[0040] The activated carbon is pretreated. The pretreatment method is: mix 5kg of activated carbon with a sodium hydroxide solution with a concentration of 100g / L, treat at 55°C for 45 minutes, and filter to obtain the product.

[0041] Wherein, gac and concentration are that the solid-liquid ratio of the sodium hydroxide solution of 100g / L is 1g:5ml;

[0042] (2) Pump the filtered waste water into the stirring tank, add 100g / L sodium hydroxide solution to activate ammonia, and adjust the pH value to 10-11;

[0043] The volume ratio of filtered waste water to sodium hydroxide solution is 100:10

[0044] (3) The ammonia activated waste water and the ammonia generated by the ammonia activat...

Embodiment 3

[0049] A method for recycling ammonium chloride in an APT production process, the specific steps are:

[0050] (1) In the clarifier, the ammonia nitrogen concentration is 40g / L ammonia nitrogen wastewater 10m 3 Use 6kg activated carbon for adsorption and pre-activation, and filter;

[0051] The activated carbon is pretreated. The pretreatment method is: mix 6kg of activated carbon with a sodium hydroxide solution with a concentration of 120g / L, treat at 60°C for 50 minutes, and filter to obtain the product.

[0052] Wherein, gac and concentration are that the solid-liquid ratio of the sodium hydroxide solution of 120g / L is 1g:8ml;

[0053] (2) Pump the filtered waste water into the stirring tank, add 120g / L sodium hydroxide solution to activate ammonia, and adjust the pH value to 10-11;

[0054] The volume ratio of filtered waste water to sodium hydroxide solution is 100:12

[0055] (3) The ammonia activated waste water and the ammonia generated by the ammonia activation are ...

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Abstract

A method for recycling ammonium chloride in an APT (ammonium paratungstate) production process comprises steps of ammonia activation, stripping, hydrochloric acid spray and the like, wherein ammonia-nitrogen wastewater is adsorbed and pre-activated with pretreated activated carbon before ammonia activation, three-stage stripping is adopted, a small amount of nitrogen is introduced in the process,so that concentration of a sodium hydroxide solution can be reduced, ammonium chloride with higher concentration can be obtained, the requirement for recycling and preparing a desorption liquid is met, and further, NH3-N concentration of deaminated wastewater and ammonia content of discharged waste gas meet Integrated wastewater discharge standard (GB8978-1996) and Emission standards for odor pollutants (GB14554-93).

Description

technical field [0001] The invention relates to a method for recycling ammonium chloride, in particular to a method for recycling ammonium chloride in the production process of APT. Background technique [0002] Ammonium paratungstate (APT) is produced by tungsten smelting ion exchange method, the tungsten-containing raw material is converted into sodium tungstate solution by pressure alkaline leaching method, and suitable alkalinity and tungsten degree are prepared, ion exchange column exchange is carried out, and tungsten is absorbed by ion exchange resin Impurities are removed, and then desorbed by a desorbent (ammonia-ammonium chloride solution). The tungsten is converted into ammonium tungstate solution. After the desorption liquid is removed, it is the product liquid. APT products. [0003] Therefore, the ammonia nitrogen wastewater produced in the smelting process is mainly produced in the ion exchange and APT crystallization process in the APT production process. If...

Claims

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Application Information

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IPC IPC(8): C01C1/16
CPCC01C1/164
Inventor 刘恒嵩戴征文戴林明
Owner 江西铜鼓有色冶金化工有限责任公司
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