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Electrolysis of acid wastewater containing dichromate with iron electrode

Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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Electrolysis of acid wastewater containing dichromate with iron electrode
Evaluation of Recent Treatment Techniques for Removal of ...
Evaluation of Recent Treatment Techniques for Removal of ...

cheapest for the removal and ,recovery, of chromium. The optimum pH for maximum removal with 1 ime is 6.6; removal of chromium exceed- ed 98% at that pH. The precipitated chromium hydroxide is separated by settling, filtered, and redissolved in sulfuric ,acid, to form chromium ,sulfate, which can be …

Final Report | Metals Recycling From Waste Sludges by ...
Final Report | Metals Recycling From Waste Sludges by ...

Recovery as their sulfates via crystallization was only one technique; it is possible that other approaches, such as precipitation as the carbonate or precipitation as the hydroxide followed by calcining, may be more economical. A mass balance of the process was prepared at a design basis of 50 wet tons per day.

TECHNOLOGY PROFILE: ACID RECOVERY AND RECYCLE …
TECHNOLOGY PROFILE: ACID RECOVERY AND RECYCLE …

Ferrous sulfate, heptahydrate and copper ,sulfate, tetrahydrate crystals recovered in the process are sold as a co-product. Thousands of tons are produced each year and used in agriculture, ,wastewater, treatment, and mining. The low operating cost of an ,acid recovery, crystallizer and the value of the co-product make this

Industrial wastewater treatment - Wikipedia
Industrial wastewater treatment - Wikipedia

Wastewaters include acidic rinse waters together with waste acid. Although many plants operate acid recovery plants (particularly those using hydrochloric acid), where the mineral acid is boiled away from the iron salts, there remains a large volume of highly acid ferrous sulfate or …

The Kinetics of the Oxygenation of Ferrous Iron in ...
The Kinetics of the Oxygenation of Ferrous Iron in ...

Phosphate removal from industrial ,wastewater, through in-situ Fe2+ oxidation induced homogenous precipitation: ... Simultaneous ,recovery, and separation of uranium and rare earths from phosphoric ,acid, in a one-cycle extraction-stripping process. ... Oxidation ,of ferrous sulfate, in ,acid, solution by a mixture of sulfur dioxide and oxygen.

Decolorization of printing and dyeing wastewater ...
Decolorization of printing and dyeing wastewater ...

It is to use ,ferrous sulfate,, polymeric ferric ,sulfate, and other chemical agents with adsorption effect to remove colored dyes in ,wastewater, by adsorption and precipitation. After the dye in the ,wastewater, is treated by this method, it is mixed with the sludge in the water and separated by the sludge to achieve the decolorization effect.

Cyanide Destruction Methods and Processes
Cyanide Destruction Methods and Processes

The process is optimally carried out at a pH of about 5.0 to 6.0 and iron is added as ,ferrous sulfate, (FeSO4-7H2O).,Ferrous sulfate, usage ranges from about 0.5 to 5.0 moles Fe per mole of CN- depending on the desired level of treatment.

Hydrometallurgical Recovery of Metals from Large Printed ...
Hydrometallurgical Recovery of Metals from Large Printed ...

29/9/2015, · The ,recovery, of precious metals ... culture in 1 L 9 K medium containing 45 g ,ferrous sulfate,, ... extraction from PCB ,wastewater, treatment sludge by sulfuric ,acid,. J. Hazard ...

Cyanide Destruction Methods and Processes
Cyanide Destruction Methods and Processes

The process is optimally carried out at a pH of about 5.0 to 6.0 and iron is added as ,ferrous sulfate, (FeSO4-7H2O).,Ferrous sulfate, usage ranges from about 0.5 to 5.0 moles Fe per mole of CN- depending on the desired level of treatment.

Industrial wastewater treatment - Wikipedia
Industrial wastewater treatment - Wikipedia

The two acids commonly used are hydrochloric acid and sulfuric acid. Wastewaters include acidic rinse waters together with waste acid. Although many plants operate acid recovery plants (particularly those using hydrochloric acid), where the mineral acid is boiled away from the iron salts, there remains a large volume of highly acid ferrous sulfate or ferrous chloride to be disposed of.

TECHNOLOGY PROFILE: ACID RECOVERY AND RECYCLE …
TECHNOLOGY PROFILE: ACID RECOVERY AND RECYCLE …

Ferrous sulfate heptahydrate and copper sulfate tetrahydrate crystals recovered in the process are sold as a co-product. Thousands of tons are produced each year and used in agriculture, wastewater treatment, and mining. The low operating cost of an acid recovery crystallizer and the value of the co-product make this

Sulfuric acid waste recycling by regenerative process ...
Sulfuric acid waste recycling by regenerative process ...

Ferrous sulfate has been researched extensively as a recovery product for waste sulfuric acid, for example, in the steel industry as pickle liquor recovery, Sulfuric Acid and Ferrous Sulfate Recovey from Waste Pickle Liquor by Thornton, W. E. in US EPA ORD Series EON-660/2-73-032 (01/00/94) and Recovery of Ferrous Sulfate and Sulfuric Acid from Spent Pickle Liquor of the Steel Industry by …

Final Report | Metals Recycling From Waste Sludges by ...
Final Report | Metals Recycling From Waste Sludges by ...

Recovery, as their sulfates via crystallization was only one technique; it is possible that other approaches, such as precipitation as the carbonate or precipitation as the hydroxide followed by calcining, may be more economical. A mass balance of the process was prepared at a design basis of 50 wet tons per day.

Decolorization of printing and dyeing wastewater ...
Decolorization of printing and dyeing wastewater ...

It is to use ,ferrous sulfate,, polymeric ferric ,sulfate, and other chemical agents with adsorption effect to remove colored dyes in ,wastewater, by adsorption and precipitation. After the dye in the ,wastewater, is treated by this method, it is mixed with the sludge in the water and separated by the sludge to achieve the decolorization effect.

Prodution of Ferrous Sulfate From Steelmeking Mill Scale
Prodution of Ferrous Sulfate From Steelmeking Mill Scale

Abstract— Spent pickle liquor from steel manufacturers is usually used to produce ferrous sulfate in the route of acid recovery. This work proposes a new process to be used industrially by which clean mill scale is used as raw material for the production of ferrous sulfate by acid leaching.

Chemicals in Water & Wastewater Treatment
Chemicals in Water & Wastewater Treatment

Chemicals in Water & Wastewater Treatment, Chemical Used for Precipitation 1. Aluminum ,sulfate, – Al 2 (SO 4) 3.18 H 2 O ... Carbonic ,acid, – H 2 CO 3 – Gas (CO 2) 7. Hydrochloric ,acid, – HCl 8. Sulfuric ,acid, – H 2 SO 4 ... ,Ferrous sulfate, oxidation -- c Filter fly control 0.1 – 0.5 Filter ponding control 1 ...

Hexavalent Chromium Removal by Reduction with Ferrous ...
Hexavalent Chromium Removal by Reduction with Ferrous ...

The process consisted of the reduction of Cr(VI) to Cr(III) using ,ferrous sulfate, followed by coagulation and filtration. Results indicated that the technology could reduce influent Cr(VI) concentrations of 100 μg L -1 to below detectable levels and also remove total Cr (Cr(VI) plus Cr(III)) to very low concentrations (<5 μg L -1 ) under optimized conditions.

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