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Composition of fracturing fluid

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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Composition of fracturing fluid
Removal of chromium (VI) using activated carbon-supported ...
Removal of chromium (VI) using activated carbon-supported ...

The chromic ,acid, predominates at pH values less than about 1.0, HCrO4- at pH range of 1.0-6.0, Cr2O72- and CrO42- at pH values above 6.0. For AC, more adsorption at acidic pH indicates that lower pH results in an increase in H? ions on the adsorbent surface that results in significantly strong electrostatic attraction between positively charged adsorbent surface and chromium ions.

Diplom.de - Technical feasibility study on the chromium ...
Diplom.de - Technical feasibility study on the chromium ...

Theoretically, HCrO4- is the predominant species between pH 1.5 and 4.0, HCrO4- and CrO42- exist in equal amounts at pH 6.5, and CrO42- predominates at higher pH values. Chromium plating ,wastewater, is generally somewhat ,acid,, and the ,acid, chromate ion HCrO4- is predominant in this ,wastewater,.

Selective capture of hexavalent chromium from an anion ...
Selective capture of hexavalent chromium from an anion ...

This ion exchange process is described by the following equation: [Zr6O4(OH)4(NH3+-BDC)6]Cl6­HA + 3Cr2O72À / [Zr6O4(OH)4(NH3+-BDC)6](,Cr2O7,)3­HA + 6ClÀ Fig. 2 (1) Schematics for the preparation of the MOR-1­HA composite. EDS data revealed no ClÀ anions in …

Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...
Salt Free Dyeing of Cotton Fabric with Reactive Dyes ...

a. Standard potassium dichromate solution, 0.25N (0.04167 M): Dissolve 12.259g K2Cr2O7 dried at 103°C for 24h in distilled water and dilute to 1000mL. Add about 120mg sulphamic ,acid, to take care of 6 mg/L NO2 – N. b. Sulphuric ,acid, reagent: Add 10g of Ag2SO4 to 1000mL concentrated H2SO4 and let stand for one to two days for complete dissolution.

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