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Process for treating industrial waste water containing chromium, vanadium

A technology for industrial wastewater and trivalent chromium, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high treatment cost, poor treatment effect, complex process, etc.

Inactive Publication Date: 2006-01-25
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the methods for treating this type of wastewater usually use electrolysis, ion exchange, adsorption, reverse osmosis and chemical reduction. The most commonly used method is to add ferrous sulfate to reduce hexavalent chromium, and add lime to neutralize the acid. Although the treated discharge water can meet the relevant national discharge standards, the treatment cost is high, the process is complicated, the treatment effect is not good, and the amount of waste residue is large, so that the filter press equipment is in overload operation. In addition, vanadium and chromium cannot be both Can get ideal processing results

Method used

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  • Process for treating industrial waste water containing chromium, vanadium

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Embodiment 1

[0011] Embodiment 1: the method for processing containing chromium, vanadium industrial waste water is: (1), preparation sodium pyrosulfite solution is standby, and the concentration of sodium pyrosulfite solution is 38~42%, and its pH value is 4.2; (2), contains chromium, The vanadium industrial waste water is placed in the reduction tank and treated according to Cr 6+ with Na 2 S 2 o 5 The molar ratio is 4:3~3.5, and the above-mentioned sodium metabisulfite solution is metered to reduce the hexavalent chromium in the chromium-containing and vanadium-containing industrial wastewater to trivalent chromium; (3), and then put the wastewater described in (2) into the and tank, and metered sodium hydroxide solution to make the V in chromium and vanadium-containing industrial wastewater 2 o 2 4+ React with sodium hydroxide to form Na 2 V 4 o 9 4H 2 O, where V 4 o 9 2- It reacts with trivalent chromium to form Cr 2 (V 4 o 9 ) 3 Precipitation, the remaining trivalent ...

Embodiment 2

[0012] Embodiment 2: the method for processing containing chromium, vanadium industrial waste water is: (1), preparation sodium pyrosulfite solution is standby, and the concentration of sodium pyrosulfite solution is 40~42%, and its pH value is 4.5; (2), contains chromium, The vanadium industrial waste water is placed in the reduction tank and treated according to Cr 6+ with Na 2 S 2 o 5 Molar ratio is 4: 3.2~3.4 ratio metering adds above-mentioned sodium pyrosulfite solution, the hexavalent chromium in the chromium-containing, vanadium industrial waste water is reduced to trivalent chromium; (3), put the waste water described in (2) into and tank, and metered sodium hydroxide solution to make the V in chromium and vanadium-containing industrial wastewater 2 o 2 4+ React with sodium hydroxide to form Na 2 V 4 o 9 4H 2 O, where V 4 o 9 2- It reacts with trivalent chromium to form Cr 2 (V 4 o 9 ) 3 Precipitation, the rest of the trivalent chromium completely form...

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Abstract

A process for treating the industrial sewage containing Cr and V includes such steps as preparing the solution of sodium pyro-sulfite, proportionally adding it to the sewage in reduction tank, reducing the 6-valence Cr to 3-valence Cr, proportionally adding the solution of sodium hydroxide to the sewage in neutralizing tank for reaction between V2O2 and sodium hydroxide to generate Na2V4O9 * 4H2O, reaction between V4O9 and said 3-valence Cr to generate Cr2(V4O9)3 deposit and changing residual 3-valence Cr to chromium hydroxide deposit, regulating pH=7.5-8.5, clarifying, and press filtering of suspended substance.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for treating industrial wastewater containing chromium and vanadium. Background technique [0002] At present, the industrial wastewater produced during the production of vanadium trioxide and vanadium pentoxide often contains a large amount of chromium and vanadium, which contains about 1g / L of total chromium and about 0.1g / L of vanadium, and hexavalent chromium is It is highly toxic. In my country, it is clearly required to strictly control the discharge of chromium-containing industrial wastewater, and the toxicity of vanadium compounds is also very high. Excessive vanadium in industrial wastewater will seriously pollute the environment and pose a serious threat to people's health. The industrial wastewater is acidic and contains mainly H + , Cr 3+ , Cr 6+ , NH 4 + , SO 4 2- , VO 3 - , the ion to be processed is Cr 3+ , Cr 6+ , VO 3 - , where,...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F9/04C02F1/70C02F1/52
Inventor 李强国
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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