Operating Experience With a Two-Stage H2S Scrubber Using Caustic Soda

1985 ◽  
Author(s):  
J.B. Siemak ◽  
M. Gelbs
Keyword(s):  
Caustic Soda ◽  
Operating Experience ◽  
Two Stage

Apatite-staffelite ore flotation efficiency improvement using two-stage slurry thickening

2022 ◽  
pp. 121-131
Author(s):  
Valery Morozov ◽  
Polivanskaya Valeriya
Keyword(s):  
Caustic Soda ◽  
Liquid Glass ◽  
Efficiency Improvement ◽  
Selective Flocculation ◽  
Two Stage ◽  
Flotation Process ◽  
Apatite Concentrate ◽  
P2o5 Content ◽  
Condensed Product ◽  
Mode A

The studies were performed suggesting that the cause of P2O5 losses during apatite-staffelite ores (ASO) treatment are due to non-selective flocculation of fine classes during flotation. When using strong flocculants, special preparation of condensed slurries is necessary, ensuring their deflocculation before the flotation process. A scheme and mode of preparation of fine classes for the flotation process have been developed, including thickening of the classification overflows using strong anionic flocculants and deflocculation of the thickened product before the flotation process with reagents-dispersants used in the basic flotation mode. A mode of preparation of slimes of ASO ores for flotation is proposed, including thickening of the discharge of the classification operation using the anionic flocculant “Praestol-2540”, conditioning of the condensed product with additions of liquid glass and caustic soda in a ratio of 1 : 1, dilution and re-thickening of deflocculated slimes, consolidation and flotation thickened sludge and sand. The big laboratory tests have shown that the application of the developed regime provides a total increase in the extraction of P2O5 from ore from 70,1 to 71,5 % with an increase in the P2O5 content in apatite concentrate from 37,1 to 37,8 %, which makes the developed technology promising for processing refractory ASO at Kovdorsky GOK.

scholarly journals Operating Experience With a 13,000 SHP, Two Stage, Fluid Cat-Cracker Power Recovery Expander

1984 ◽  
Author(s):  
David H. Linden ◽  
William G. Mathers
Keyword(s):  
High Temperature ◽  
Operating Experience ◽  
Successful Operation ◽  
Two Stage ◽  
Gas Environment ◽  
Critical Components ◽  
Power Recovery

An internal inspection of the expander after 16,000 hours of operation confirmed the successful operation of Ingersoll-Rand’s first two stage, high temperature, FCC expander. This paper discusses the construction and operation of the unit, designed for 1300°F (704°C) dirty gas environment and presents the inspection results of critical components.

scholarly journals Development of two-stage alkaline refining of oils obtained from low-grade cotton seeds using caustic soda, sodium silicate and microwave radiation

2021 ◽  
Vol 264 ◽  
pp. 02058
Author(s):  
Azimjon Akhmedov ◽  
Eldor Rakhmatov ◽  
Dilfuza Rajabova
Keyword(s):  
Caustic Soda ◽  
Sodium Silicate ◽  
Mass Fraction ◽  
Cottonseed Oil ◽  
Low Grade ◽  
Two Stage ◽  
Cotton Seeds ◽  
Improved Technology ◽  
Production Conditions ◽  
Frequency Radiation

The article substantiates the improved technology of two-stage alkaline refining of oils obtained from low-grade cotton seeds using caustic soda and sodium silicate. On the basis of the technological scheme, the norms of technological modes have been developed. In the pilot production conditions of Karshiyog-extraction JSC, we tested the developed technology of two-stage alkaline refining of oils obtained from low-grade cotton seeds and ultrahigh-frequency radiation. The developed technology makes it possible to significantly reduce the color, acid, and peroxide numbers and the mass fraction of unsaponifiable substances in the resulting oil. This helps to increase the yield of bleached oil, reduce the consumption of bleaching clay and improve the quality and food safety of the resulting product. As a result, the yield of refined cottonseed oil, obtained from low-grade cotton seeds, increased by 1.1 times (90%) (compared to the traditional one (85.1)).

B&W IR-CFB: Operating Experience and New Development

2005 ◽  
Author(s):  
M. Maryamchik ◽  
D. L. Wietzke
Keyword(s):  
Operating Experience ◽  
Collection System ◽  
Two Stage ◽  
New Development ◽  
Boiler Design ◽  
Erosion Protection

The paper provides an update on B&W Internal Recirculation (IR) CFB boilers featuring a two-stage solids collection system. The paper describes the latest commercial projects, operating experience and developments in boiler design and process. Those concern solids collection system, erosion protection, etc.

The PGT2, a New 2-MW Class Efficient Gas Turbine: Applications and Operating Experience in Cogeneration

1996 ◽  
Author(s):  
Erio Benvenuti ◽  
Marco Sargenti
Keyword(s):  
Gas Turbine ◽  
Pressure Ratio ◽  
Operating Experience ◽  
Paper Mill ◽  
Medium Size ◽  
Economic Evaluations ◽  
Cogeneration Plant ◽  
Two Stage ◽  
Paper Mills ◽  
Operational Data

The PGT2 is a single-shaft gas turbine with a 2 MW ISO electric output that, after an extensive factory development program has been launched into industrial service with a number of cogeneration applications in small-medium size industries. The two-stage high pressure ratio compressor combined with the single-can combustor and the two-stage air-cooled transonic turbine provides a compact and rugged architecture. The turbine inlet temperature in the 1050–1100 °C class and the 12.5:1 pressure ratio provide a 25% electrical efficiency and a high exhaust temperature that make this machine attractive for a variety of both civil and industrial applications like hospitals and pulp and paper mills, textile, tiles, cement, glass and food production. The exhaust heat recovery boiler can be either a commercial unit or compact once-through type of proprietary design that is housed in a vertical exhaust duct to substantially reduce powerplant footprint area when space is limited. The first application that has provided the most extensive operating experience so far is cogeneration in a paper mill in central Italy. Detailed studies on the potential energy saving and on the return of investment cycle were made in collaboration with the client, and provided a valuable basis for further studies that led to additional orders for paper mills, textile and tile industries. The first installed unit is a package comprising a once-through-flow boiler that was full-load tested at the factory before shipping. Commissioning of the cogeneration plant was started in 30 days after shipment and the plant was taken over by the client in less than three months. A dedicated telephone line allows the power plant to be monitored directly from Florence, thus making it possible to gather operational data in real time and to provide this first customer with prompt assistance during the 4-year service and maintenance contract period. This paper describes the PGT2 design and performance features, the technical and economic evaluations made for the first application, the cogeneration plant layout and a summary of the most significant operational data collected in the initial months or regular service in the paper mill.

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

364: Two stage "Progressive Elongation of Spermatic Cord" Technique in Criptorchidism with very short Spermatic Vessels

2007 ◽  
Vol 177 (4S) ◽  
pp. 121-121
Author(s):  
Antonio Dessanti ◽  
Diego Falchetti ◽  
Marco Iannuccelli ◽  
Susanna Milianti ◽  
Gian P. Strusi ◽  
...  
Keyword(s):  
Spermatic Cord ◽  
Two Stage

360: A Contemporary Analysis of Two-Stage Hypospadias Repair

2007 ◽  
Vol 177 (4S) ◽  
pp. 120-120
Author(s):  
Pamela I. Ellsworth ◽  
Anthony Caldamone
Keyword(s):  
Hypospadias Repair ◽  
Two Stage
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