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Hexavalent chromium and trivalent chromium in acid wastewater

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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Hexavalent chromium and trivalent chromium in acid wastewater
Removal of sodium salts and chemical oxygen demand from ...
Removal of sodium salts and chemical oxygen demand from ...

11/2/2015, · A combined process of precipitation, complex extraction, and stripping was proposed as a method for treating such wastewater. Fluosilicic acid was selected as a precipitator for the recovery of sodium ions, trialkylamine (N235) as the extractant, and sodium hydroxide (NaOH) as a back-extractant.

Novel and Effective Separation Technology for Crystal ...
Novel and Effective Separation Technology for Crystal ...

In the N235–P350 order, the aqueous feed for extraction with P350 was prepared by mixing the aqueous raffinates after extraction using 25 pct N235 with concentrated nitric acid and distilled water. In 100- mL aqueous raffinates, some volume of concentrated nitric acid was added to regulate the HNO concentra- tion, and some volume of distilled water was added to control the total volume up to 150 mL.

Study of cyanide wastewater treatment by dispersion ...
Study of cyanide wastewater treatment by dispersion ...

The developed treatment methods for cyanide ,wastewater, are active carbon adsorption, ferrate oxidation process, photo-catalytic oxidation, membrane method, ion exchange method, solvent ,extraction,, electrolysis and so on. Although these treatment methods for cyanide have a certain effect, they are still insufficient in some aspects.

Study of cyanide wastewater treatment by dispersion ...
Study of cyanide wastewater treatment by dispersion ...

The developed ,treatment, methods for cyanide ,wastewater, are active carbon adsorption, ferrate oxidation process, photo-catalytic oxidation, membrane method, ion exchange method, solvent ,extraction,, electrolysis and so on. Although these ,treatment, methods for cyanide have a certain effect, they are still insufficient in some aspects.

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