Treatment method of arsenic-containing wastewater in tungsten smelting

A treatment method and wastewater technology, applied in metallurgical wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of few applications, and achieve the effect of simple process and strong operability

Inactive Publication Date: 2016-10-12
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The adsorption method mainly uses the strong adsorption of the adsorbent (with a large active surface area or adsorption group) to adsorb arsenic, and then achieves the purpose of removing arsenic through filtration. This method can treat arsenic-containing wastewater and reduce the concentration of arsenic in the wastewater to a minimum. It has the advantages of high treatment efficiency and small adsorption interference, but it is rarely used in the treatment of high-concentration arsenic-containing industrial wastewater.

Method used

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  • Treatment method of arsenic-containing wastewater in tungsten smelting

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Effect test

Embodiment 1

[0033] A tungsten mine selects arsenic-containing wastewater (total arsenic mass concentration is 10.0mg / L), and the treatment steps for the arsenic-containing wastewater are as follows:

[0034] Step 1) Under normal temperature, pretreat the arsenic-containing wastewater generated during the tungsten smelting process, adjust the pH of the wastewater after pretreatment, slowly add sulfuric acid to the wastewater, and adjust the pH of the wastewater to 10.0-12.0;

[0035] Step 2) Add 3.0% hydrogen peroxide to the wastewater in step 1), the concentration of hydrogen peroxide is 0.4g / L, then stir for 15min, the stirring speed is 60r / min;

[0036] Step 3) continue to add 3.3% ferric chloride in the waste water of step 2), the concentration of ferric chloride is 3.2g / L, while adding ferric chloride, carry out rapid stirring, stirring speed is 300r / min, Stirring time is 10s; then carry out slow stirring, stirring speed is 20r / min, stirring time is 15min;

[0037] Step 4) Finally, t...

Embodiment 2

[0040] For a tungsten smelting arsenic-containing wastewater (total arsenic mass concentration is 10.5mg / L), the treatment steps for the arsenic-containing wastewater are as follows:

[0041] Step 1) Under normal temperature, pretreat the arsenic-containing wastewater generated during the tungsten smelting process, adjust the pH of the wastewater after pretreatment, slowly add hydrochloric acid to the wastewater, and adjust the pH of the wastewater to 10.0-12.0;

[0042] Step 2) Add sodium percarbonate to the wastewater in step 1), the concentration of sodium percarbonate is 0.38g / L, then stir for 18min, the stirring speed is 75r / min;

[0043] Step 3) continue to add ferrous chloride in the waste water of step 2), the concentration of ferrous chloride is 0.2g / L, while adding ferrous chloride, carry out rapid stirring, stirring speed is 400r / min, stirring time for 15s; then carry out slow stirring, the stirring speed is 30r / min, and the stirring time is 20min;

[0044] Step 4)...

Embodiment 3

[0047] For a tungsten smelting arsenic-containing wastewater (total arsenic mass concentration is 46.95 mg / L), the treatment steps for the arsenic-containing wastewater are as follows:

[0048] Step 1) Under normal temperature, pretreat the arsenic-containing wastewater generated during the tungsten smelting process, adjust the pH of the wastewater after pretreatment, slowly add nitric acid to the wastewater, and adjust the pH of the wastewater to 10.0-12.0;

[0049] Step 2) Add sodium hypochlorite to the wastewater in step 1), the concentration of sodium hypochlorite is 1.64g / L, then stir for 25min, the stirring speed is 80r / min;

[0050] Step 3) continue to add ferrous sulfate in the waste water of step 2), the concentration of ferrous sulfate is 0.83g / L, while adding ferrous sulfate, carry out rapid stirring, stirring speed is 500r / min, and stirring time is 20s; Carry out slow stirring again, the speed of stirring is 50r / min, and stirring time is 25min;

[0051] Step 4) Fi...

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Abstract

The invention discloses a method for treating arsenic-containing wastewater from tungsten smelting. The steps are as follows: Step 1) Under normal temperature, pretreat the arsenic-containing wastewater generated during the tungsten smelting process, and adjust the pH of the wastewater to 10.0-12.0 after the pretreatment; 2) Add an oxidizing agent to the wastewater in step 1), and then stir for 15 to 25 minutes; step 3) continue to add iron salt to the wastewater in step 2), first stir rapidly for 10 to 20 seconds, and then stir slowly for 15 to 25 minutes; step 4 ) Finally, the waste water obtained in step 3) is left to settle and filtered. The method of the present invention treats the arsenic-containing wastewater in tungsten smelting by the "oxidant + iron salt" method, and the concentration of arsenic in the treated wastewater reaches the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996), and the method is simple in process, Strong operability, suitable for large-scale industrial production applications.

Description

technical field [0001] The invention relates to a method for treating arsenic-containing waste water from tungsten smelting, belonging to the technical field of sewage treatment. Background technique [0002] Tungsten is a rare metal with high melting point and high hardness. It is widely used in metallurgy, machinery, petroleum, mining, electronics, aerospace and other fields. In the production process of ammonium paratungstate (APT) in the tungsten compound, the tungsten concentrate is boiled with alkali to produce sodium tungstate. After removing impurities and adjusting the pH value and concentration, it enters the ion exchange column, and the resin and sodium tungstate solution are carried out countercurrently. Exchange, the impurities in the minerals such as arsenic enter the sodium tungstate solution together, and enter the waste water with the post-transaction solution during the ion exchange purification of tungsten. Generally speaking, the concentration of arsenic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/10
CPCC02F9/00C02F1/001C02F1/66C02F1/72C02F1/722C02F2001/007C02F2101/103C02F2103/16
Inventor 赖兰萍陈后兴陈冬英杨新华张积锴洪侃李忠岐周洁英张选旭陈淑梅
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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