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Treatment method for waste water after purification of graphite

A waste water treatment and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problems of unreachable pollution treatment, sludge generation pollution source, high treatment cost, etc. , to achieve stable purification effect, fast processing speed and good operating conditions

Inactive Publication Date: 2011-08-17
LUOYANG GUANQI INDAL & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the purification of graphite, a large amount of acidic wastewater will be produced. In the traditional sewage treatment method, Ca2+ is first added to precipitate impurities, and then AL2(SO4)3 Mixed treatment of acidic wastewater produced in the graphite purification process, but this method has high treatment costs, and it is easy to generate a large amount of sludge during the treatment process to generate pollution sources again, which cannot reach the treatment pollution treatment For the purpose of this method, the operation of this method is complicated, so a sewage treatment method with small investment, low production cost and simple and convenient operation is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The wastewater treatment method after the graphite is purified, the method steps are:

[0040] Step 1, take water 75% and lime 25% by weight percentage, mix, obtain lime emulsion, for subsequent use;

[0041] Step 2. Send the acidic waste water produced in the process of purifying graphite into the neutralization reaction pool I, and add lime emulsion into the neutralization reaction pool I to adjust the pH value in the neutralization reaction pool I to 4.0. In the process, turn on the mixer and stir at a speed of 200 rpm, so that the acidic substances in the wastewater can fully react with the lime emulsion, Ca 2+ and Na 2+ with CL - The reaction in water produces CaCl which is easily soluble in water 2 , NaCl; Ca 2+ and Na 2+ with F in water - , SO 4 2- combined to form water-insoluble CaF 2 , CaSO 4 and Na dissolved in water 2 F. Na 2 SO 4 , metal ions such as iron, lead, copper and Ca(OH) in water 2 , NaOH reacts to generate Fe(OH) 3 , Pb(OH) 2 、Cu(O...

Embodiment 2

[0049] The treatment method of waste water after purifying graphite, its step is:

[0050] Step 1, take water 80% and lime 20% by weight percentage, mix, obtain lime emulsion, for subsequent use;

[0051] Step 2. Send the acid waste water produced in the process of purifying graphite into the neutralization reaction pool I, and add lime emulsion into the neutralization reaction pool I to adjust the pH value in the neutralization reaction pool I to 4.5. During the process, turn on the mixer and stir at a speed of 200 rpm, so that the acidic substances in the wastewater can fully react with the lime emulsion, Ca 2+ and Na 2+ with CL - The reaction in water produces CaCl which is easily soluble in water 2 , NaCl; Ca 2+ and Na 2+ with F in water - , SO 4 2- combined to form water-insoluble CaF 2 , CaSO 4 and Na dissolved in water 2 F. Na 2 SO 4 , metal ions such as iron, lead, copper and Ca(OH) in water 2 , NaOH reacts to generate Fe(OH) 3 , Pb(OH) 2 、Cu(OH) 2 Wai...

Embodiment 3

[0059] The treatment method of waste water after purifying graphite, its step is:

[0060] Step 1, take water 85% and lime 15% by weight percentage, mix, obtain lime emulsion, for subsequent use;

[0061] Step 2. Send the acid waste water produced in the process of purifying graphite into the neutralization reaction pool I, and add lime emulsion into the neutralization reaction pool I to adjust the pH value in the neutralization reaction pool I to 5.0. During the process, turn on the mixer to stir at a speed of 300 rpm, so that the acidic substances in the wastewater can fully react with the lime emulsion, Ca 2+ and Na 2+ with CL - The reaction in water produces CaCl which is easily soluble in water 2 , NaCl; Ca 2+ and Na 2+ with F in water - , SO 4 2- combined to form water-insoluble CaF 2 , CaSO 4 and Na dissolved in water 2 F. Na 2 SO 4 , metal ions such as iron, lead, copper and Ca(OH) in water 2 , NaOH reacts to generate Fe(OH) 3 , Pb(OH) 2 、Cu(OH) 2Wait ...

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Abstract

The invention discloses a treatment method for waste water after purification of graphite. The method includes the steps as follows: reacting the waste water generated in the purification of the graphite with lime milk liquid; adjusting the pH value to 5.0-6.0; feeding the treated waste water into a multistage purification-sedimentation tank; after multistage purification, feeding the waste water into a flocculation reactor in a waste water treatment system; adding alkali liquor to adjust the pH value to 6.5-8.0, adding polyaluminium chloride to adjust the pH value to 6.0-7.0 and finally adding a chemical oxygen demand remover, polyacrylamide and a metal capture agent for stirring until alum particles are formed in the waste water; stopping stirring and separating sediments generated in the waste water; concentrating, pressing and then discharging separated sediments into a sludge box; and discharging or recycling separated purified water after the purified water passing inspection. The treatment method has the advantages of low expenditure in equipment construction and operation process, low treatment cost, easiness for operation and control, and good treatment effect for the waste water; and the method reduces the production cost and the physical injury to personnel and prolongs the service life of waste water treatment equipment.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a sewage treatment method after graphite purification. technical background [0002] At present, a large amount of acidic wastewater or waste gas is often produced in the production process of purified graphite. According to the national standard of the People's Republic of China, the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" stipulates that urban sewage treatment plant effluent, exhaust gas discharge and sludge treatment ( Control) pollutant limits, only treated wastewater that meets national standards can be discharged. After the graphite is purified, a large amount of acidic wastewater will be produced, and in the traditional sewage treatment method, Ca is first added 2+ Add AL after precipitation of impurities 2 (SO4) 3 Mixed treatment of acidic wastewater produced in the graphite purification process, but this method has high treatment costs, and it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66
Inventor 候玉奇
Owner LUOYANG GUANQI INDAL & TRADE
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