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Hydraulic Oil Change

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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Hydraulic Oil Change
Recovery of Volatile Fatty Acids from Fermented Wastewater ...
Recovery of Volatile Fatty Acids from Fermented Wastewater ...

Since VFA concn. in fermented ,wastewater, is very low (∼1 wt.%) and fermented ,wastewater, contains considerable amts. of dissolved salts, ,recovery, of VFAs from fermented ,wastewater, is challenging. To study the potential of some ionic liqs. compared to traditional solvents for extn. of VFAs from fermented ,wastewater,, a detailed study on the effects of various salt-originating ions on VFA extn. was performed.

Subject:
Subject: "sodium sulfide" / Journal: Journal of hazardous ...

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Dechelation of Cd-EDTA complex and recovery of EDTA from ...
Dechelation of Cd-EDTA complex and recovery of EDTA from ...

Washing water ,containing, poorly degradable heavy metal-EDTA complexes is produced by ethylenediaminetetraacetic ,acid, (EDTA) washing of heavy metal-contaminated soil. A series of batch experiments were performed to explore the dechelation of heavy metal-EDTA complexes and the ,recovery, of EDTA from simulated soil-washing ,solution, using ,sulfide, precipitation with Na₂S.

Hydrometallurgical process for recovery of precious metals ...
Hydrometallurgical process for recovery of precious metals ...

Hydrometallurgical process for recovery of precious metals from refractory ,sulfide, ores, including the processing of ore with nitric ,acid, with separation of NO x gases and their subsequent regeneration of nitric ,acid, and recycling of nitric ,acid, in the process and getting rich in noble metals ore product with subsequent recovery of precious metals by treating the leach ,solution,, characterized in that before nitric ,acid, …

Process for recovering arsenic from acidic aqueous solution
Process for recovering arsenic from acidic aqueous solution

The supernatant liquid was then treated with ,sodium sulfide, to further recover arsenic. After the addition of ,sodium sulfide,, the ,solution, contained about 580 g/L sulfuric ,acid, with less than 5 ppm arsenic. Thus, the ,solution, could be used as a weak ,acid, in other processes.

Subject:
Subject: "sodium sulfide" / Journal: Journal of hazardous ...

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Insights to False Positive Total Cyanide Measurements in ...
Insights to False Positive Total Cyanide Measurements in ...

This procedure was identical to that described for chlorine and ,sulfide, removal except that, just before analysis, 80 L of the 6.35g/L sulfamic ,acid solution, was added with further mixing.

Process for recovering arsenic from acidic aqueous solution
Process for recovering arsenic from acidic aqueous solution

The supernatant liquid was then treated with sodium sulfide to further recover arsenic. After the addition of sodium sulfide, the solution contained about 580 g/L sulfuric acid with less than 5 ppm arsenic. Thus, the solution could be used as a weak acid in other processes.

Hazardous Waste Characteristics | Hazardous Waste Test ...
Hazardous Waste Characteristics | Hazardous Waste Test ...

Reactive ,sulfide,, formerly described in SW‐846 Section 7.3.4.2, referred to those ,sulfide, species that could form hydrogen ,sulfide, gas under mildly acidic conditions. In July 1985, EPA issued interim guidance describing certain threshold levels for cyanide‐ and ,sulfide,‐bearing wastes and laboratory methods for evaluating such wastes.

Total Sulfide Methylene Blue Method
Total Sulfide Methylene Blue Method

2/11/2012, · ,Sulfide, is separated from the sample matrix by suspending the sample in a hydrochloric ,acid solution, and vigorous agitation. Hydrogen ,sulfide, gas is released from the sample and collected in a gas scrubbing bottle cotaining ,sodium, hydroxide. The methylene blue method is based on

Special Issue
Special Issue "Separation and Leaching for Metals Recovery"

Furthermore, the result was compared with that for the sulfuric ,acid solution containing, neither Cu 2+ nor O 2 and with the sulfuric ,acid solution, without Cu 2+ and O 2. When both Cu 2+ and O 2 2+ concentration, and 100 cc/min O 2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu 2 ...

Nitrogen and Phosphorus Recovery from Wastewater ...
Nitrogen and Phosphorus Recovery from Wastewater ...

20/8/2015, · Chemical precipitation can remove 80–99 % P in ,wastewater, streams and recover it in the form of fertilizer (struvite). ,Acid, hydrolysis can convert recovered P into usable phosphoric ,acid, and phosphate fertilizers.

Removal and Recovery of Sulfur from Sulfide Dye ...
Removal and Recovery of Sulfur from Sulfide Dye ...

Removal and ,recovery, of sulfur from ,sulfide, dye intermediate ,wastewater, was studied by iron clip filtration coagulation process.The results show that under the optimum operating conditions the removal rate of sulfur and COD are 98.5% and 65.0% respectively.After treatment the effluent is clear and transparent.At the same time Na 2S ,solution, with mass fraction of 56% can be recovered and reused ...

Sulfide clean-up of solutions from heavy metal ions ...
Sulfide clean-up of solutions from heavy metal ions ...

OSTI.GOV Journal Article: ,Sulfide, clean-up of solutions from heavy metal ions

Dechelation of Cd-EDTA complex and recovery of EDTA from ...
Dechelation of Cd-EDTA complex and recovery of EDTA from ...

Washing water ,containing, poorly degradable heavy metal-EDTA complexes is produced by ethylenediaminetetraacetic ,acid, (EDTA) washing of heavy metal-contaminated soil. A series of batch experiments were performed to explore the dechelation of heavy metal-EDTA complexes and the ,recovery, of EDTA from simulated soil-washing ,solution, using ,sulfide, precipitation with Na₂S.

Special Issue
Special Issue "Separation and Leaching for Metals Recovery"

Furthermore, the result was compared with that for the sulfuric ,acid solution containing, neither Cu 2+ nor O 2 and with the sulfuric ,acid solution, without Cu 2+ and O 2. When both Cu 2+ and O 2 2+ concentration, and 100 cc/min O 2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu 2 ...

Zinc Precipitation and Recovery From Viscose Rayon Waste Water
Zinc Precipitation and Recovery From Viscose Rayon Waste Water

During the time when the sodium cellulose xanthate from the viscose solution is in contact with acid, while in the main pumping pit or in the long 10-inch diameter FRP pipeline from the pumping pit to the re- covery plant itself, the xanthate has sufficient reaction time to decom- pose to insoluble cellulose floe, sodium sulfate and sulfur by-product compounds.

Sulfide clean-up of solutions from heavy metal ions ...
Sulfide clean-up of solutions from heavy metal ions ...

OSTI.GOV Journal Article: ,Sulfide, clean-up of solutions from heavy metal ions

Removal and Recovery of Sulfur from Sulfide Dye ...
Removal and Recovery of Sulfur from Sulfide Dye ...

Removal and ,recovery, of sulfur from ,sulfide, dye intermediate ,wastewater, was studied by iron clip filtration coagulation process.The results show that under the optimum operating conditions the removal rate of sulfur and COD are 98.5% and 65.0% respectively.After treatment the effluent is clear and transparent.At the same time Na 2S ,solution, with mass fraction of 56% can be recovered and reused ...

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