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Deep purification method of tungsten smelting wastewater

A technology for deep purification and wastewater treatment, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. It can solve the problems of large wastewater discharge and complex components, achieve no secondary pollution and simple steps , the effect of improving the efficiency of arsenic removal

Active Publication Date: 2014-01-22
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wastewater produced by tungsten smelting enterprises not only has a large amount of discharge, but also has complex components. With the increasingly stringent discharge standards, traditional treatment methods are increasingly unable to meet the requirements of modern industry. Advanced cleaning, low energy consumption, easy implementation, and easy monitoring Advanced tungsten smelting wastewater treatment technology is bound to replace traditional treatment methods

Method used

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  • Deep purification method of tungsten smelting wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the deep purification method of tungsten smelting wastewater is:

[0035] Step 1, at normal temperature, pretreat the ammonia nitrogen waste liquid produced during the tungsten smelting process, and then mix the ion exchange liquid produced by the tungsten smelting with the pretreated ammonia nitrogen waste liquid at a volume ratio of 1:5, The total volume of the mixture is 10m 3 , slowly add milk of lime with a mass percentage concentration of 220-250 g / L to the mixed solution to adjust the pH value to 11, detect the content of arsenic in the mixed solution with silver diethylaminodithioformate spectrophotometry, and then add the Add ferrous sulfate to the mixed solution of milk of lime, and the amount of added ferrous sulfate is to make the ratio of ferrous sulfate and arsenic in the mixed solution to be 2:1, and then to the Add 1 kg of ferrous sulfate to the mixed solution and feed air into the mixed solution, then carry out conventional ...

Embodiment 2

[0039] Such as figure 1 As shown, the deep purification method of tungsten smelting wastewater is:

[0040] Step 1, at normal temperature, pretreat the ammonia-nitrogen waste liquid produced in the tungsten smelting process, and then mix the ion exchange liquid produced in the tungsten smelting process with the pretreated ammonia-nitrogen waste liquid at a volume ratio of 1:6, The total volume of the mixture is 10m 3 , slowly add milk of lime with a concentration of 220-250 g / L in mass percentage to the mixed solution to adjust the pH value to 11.5, detect the content of arsenic in the mixed solution by silver diethylaminodithioformate spectrophotometry, and then add the Add ferrous sulfate to the mixed solution of milk of lime, and the amount of added ferrous sulfate is to make the ratio of ferrous sulfate and arsenic in the mixed solution to be 3:1, and then to the Add 1.2kg of ferrous sulfate to the mixed solution while introducing air into the mixed solution, then carry ...

Embodiment 3

[0044] Such as figure 1 As shown, the deep purification method of tungsten smelting wastewater is:

[0045] Step 1, at normal temperature, pretreat the ammonia nitrogen waste liquid produced during the tungsten smelting process, and then mix the ion exchange liquid produced by the tungsten smelting with the pretreated ammonia nitrogen waste liquid at a volume ratio of 1:8, The total volume of the mixture is 10m 3 , slowly add milk of lime with a mass percentage concentration of 220-250 g / L to the mixed solution to adjust the pH value to 12, use silver diethylaminodithioformate to detect the content of arsenic in the mixed solution, and then add the Add ferrous sulfate to the mixed solution of milk of lime, and the amount of added ferrous sulfate is to make the ratio of ferrous sulfate and arsenic in the mixed solution to be 4:1, and then to the Add 1.5kg of ferrous sulfate to the mixed solution while introducing air into the mixed solution, then carry out conventional stirri...

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Abstract

The invention discloses a deep purification method of tungsten smelting wastewater. The deep purification method is characterized by comprising the steps of mixing an ammonia nitrogen waste solution after pretreatment and an ion after-exchange solution produced by tungsten smelting according to the volume ratio of (1: 8)-(1: 5) at normal temperature, then adding lime milk to regulate the pH value of a mixed solution to 11-12, and then adding ferrous sulfate into the mixed solution to perform first-stage treatment to obtain first-stage filtrate; adding dilute sulfuric acid into the first-stage filtrate to regulate the pH value to 5-6, and then respectively adding sodium sulfide and ferrous sulfate into the first-stage filtrate to perform second-stage treatment to obtain second-stage filtrate; adding a flocculant into the second-stage filtrate, naturally settling, then performing precision filtration, and pumping obtained third-stage filtrate into a styrene quaternary amine type strong base anion exchange column. According to the method disclosed by the invention, two-stage chemical precipitation and ion exchange processes are taken as main processes of wastewater treatment, and the method has the advantages of simple steps, low equipment investment, easiness in monitoring, easiness in operation, low treatment cost, no secondary pollution, energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, and mainly relates to a deep purification method for tungsten smelting wastewater. Background technique [0002] At present, the production of ammonium paratungstate (APT) in China mostly adopts the ion exchange process, which consumes a lot of water and discharges a large amount of wastewater, and the discharged wastewater contains NH 3 -N, A s , P, Si and other harmful substances will cause great harm to the environment if not handled. In recent years, with the country's emphasis on environmental protection and the strengthening of the implementation of environmental protection laws and regulations, tungsten smelting enterprises must follow the principles of clean production, pollutant discharge and total amount control in order to achieve long-term and sustainable development, so as to truly achieve energy conservation and emission reduction , green production. The wastewater p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 谢泉文
Owner CNMC GUANGXI PGMA
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