منزل •bayer process heat exchangers - search results

bayer process heat exchangers - search results

  • Used Heat Exchangers for Sale • Louisiana Chemical ...

    Louisiana Chemical Equipment Company is the leader in used process equipment sales and complete industrial plants. LCEC's equipment is available for purchase, inspection and re-location. Our inventory includes over 14,000 items listed by each process equipment category. These include pumps, tanks, vessels, heaters, heat exchangers, centrifuges, mixers, motors, columns, silos, sifters ...

  • US20070178041A1 - The bayer process for production of ...

    Bayer process, comprising grinding (L, B) and then digestion (N 2, A) of a bauxite by bringing it into contact with a sodium aluminate liquor ( 20 b, 120 b ). Digestion consists of forming a slurry ( 3 a, 103 ) that is then treated to separate insoluble residues ( 5 a, 105 a ) from the sodium aluminate liquor. The liquor is then crystallized (D) and recycled back to green liquor ( 20, 120 ...

  • Bayer Process: Manufacturing Of Alumina | Making of Alumina

    The Bayer Process: Alumina is the main components of bauxite, so bauxite is refined in order to produce Alumina. The Bayer process is the principal way for producing alumina by refining Bauxite. Bauxite other than with 30-60percentage of aluminium oxide contains mixture of silica, iron oxides and titanium dioxide.

  • Presidential Green Chemistry Challenge: 2012 Greener ...

    Innovation and Benefits:The "Bayer process" converts bauxite to alumina, the raw material for making aluminum. Mineral scale deposited on the heat exchangers and pipes in Bayer process plants increases energy use. Removing the scale requires stopping production and cleaning with sulfuric acid. Cytec's product hinders scale growth.

  • NOTICE: this is the author's version of a work that was ...

    The formation of desilication products (DSPs) is an important process in the pre-desilication step of the Bayer process, helping to limit the potential for unwanted scale on the heat exchangers by limiting the amount of silicate in the Bayer liquor. These solids generally have

  • "Bayer Process Heat Exchangers Cleaning Efficiency" by ...

    Recommended Citation. Sébastien Fortin and Raymond Breault, "Bayer Process Heat Exchangers Cleaning Efficiency: Optimizing the Acid Dissolution of Sodalite Scale" in "Heat Exchanger Fouling and Cleaning: Fundamentals and Applications", Paul Watkinson, University of British Columbia, Canada; Hans Müller-Steinhagen, German Aerospace Centre (DLR) and University of Stuttgart; M. Reza …

  • Understanding and mitigating heat exchanger fouling in ...

    Understanding and mitigating heat exchanger fouling in bauxite refineries. Laboratory and plant measurements have been performed to evaluate possibilities of reducing the formation of desilication product (DSP) scale in the heat exchangers of the low-temperature Bayer process. It was found that the rate of scale formation is independent of the ...

  • OPUS at UTS: Macromolecular organic Bayer process poisons ...

    The organic material present in the Bayer process liquor from a high temperature alumina refinery operating at 250-255oC was examined in this study. ... in the shell-side of the heat exchangers, on sodium oxalate crystals, on precipitated aluminium hydroxide "gibbsite", in precipitation tank scale, and on oxalate-gibbsite co-precipitation fines ...

  • Determining silica solubility in bayer process liquor ...

    The efficient precipitation of dissolved silica from Bayer process liquor is essential for the production of high-quality alumina and the reduction of excessive scaling in the heat exchangers in the evaporation building of Bayer processes. The accurate prediction of silica solubility in Bayer liquor is one of the key parameters in improving the design and operation of the desilication process.

  • Understanding Heat Exchangers - Types, Designs ...

    A close-up view of a section of a water-to-air heat exchanger. Image Credit: Alaettin YILDIRIM/Shutterstock.com. Heat exchangers are devices designed to transfer heat between two or more fluids—i.e., liquids, vapors, or gases—of different temperatures. Depending on the type of heat exchanger employed, the heat transferring process can be gas-to-gas, liquid-to-gas, or liquid-to …

  • Bayer Process - an overview | ScienceDirect Topics

    Alton T. Tabereaux, Ray D. Peterson, in Treatise on Process Metallurgy: Industrial Processes, 2014 2.5.1.1 Impact of Different Bauxites on the Bayer Process. The Bayer process is basically used for the extraction of aluminum hydrate from the bauxite ores with the mass ratio of alumina to silica (A/S) above 9. The sinter process is widely used to process the poor-grade diasporic bauxite ores ...

  • China High-end Tantalum Heat Exchangers Market Report ...

    China High-end Tantalum Heat Exchangers Market, By Type, 2016-2021, 2022-2027 ($ Millions) & (Units) ... Bayer Natures Way Pharmavite Hero Nutritonals Herbaland Smarty Pants Vitamins Softigel Rainbow Light ... 1.4.2 Research Process 1.4.3 Base Year

  • FORMATION OF GIBBSITE SCALE IN THE BAYER PROCESS ON …

    the Bayer Process. The accumulation of scale reduces the efficiency of heat exchangers considerably and may generate other problems such as pipe blockages and probe malfunction. Many researchers have been challenged by fouling problems. They explained scale formation phenomenon using different techniques or hypotheses. Our

  • Energy Efficient Technologies and Operating Practices in ...

    Plate Heat Exchangers • As compared to shell and tube heat exchangers, the temperature approach in a plate heat exchangers may be as low as 1 °C whereas shell and tube heat exchangers require an approach of 5 °C or more. • For the same amount of heat exchanged, the size of the plate heat exchanger is smaller, because of the

  • Home for Used Process Equipment, Heat Exchangers ...

    LCEC is the leader in used process equipment sales and complete industrial plants. Our equipment is available for inspection and re-location to you. LCEC's inventory includes 14,000+ items listed by each process equipment category. These include pumps, tanks, vessels, heaters, heat exchangers, centrifuges, mixers, motors, columns, silos, sifters, filters, compressors… 85 categories in all.

  • Scale Formation During the Bayer Process and a Potential ...

    Scale samples were collected from various locations in a high-temperature Bayer process plant (SPIC Shanxi Aluminum Co., Ltd., China). High-silica diasporic bauxite with an average composition of 51.2% Al 2 O 3, 10.5% SiO 2, 11.6% Fe 2 O 3, and 2.51% TiO 2 was charged as the primary raw material in the plant 2 months before the sampling.

  • Mathematical modelling of internal heat recovery in flash ...

    Precipitator area for the Bayer process. Regarding the very energy intensive character of the Bayer process, many developments, aiming at an energy demand reduction, were suggested. Thus it was suggested to re-use the low-grade heat of calcination for spent liquor evaporation [1], or to introduce a new type Spiral Heat Exchangers

  • US8029752B2 - Approach in controlling DSP scale in bayer ...

    The invention provides a method of controlling silica in the liquor circuit of the Bayer process. The method involves addition of a promoter material to enhance the precipitation of DSP and includes adding one or more silica dispersion materials or dry silica forms to those parts of the circuit where precipitation of DSP and removal of silica from solution is desirable; for example the ...

  • Alfa Laval - Process shell-and-tube heat exchangers

    Our process heat exchangers are often used in production-critical positions under extreme conditions, and have a reputation for solid operating reliability and high performance. Talk to an expert We will be happy to discuss the benefits of an Alfa Laval Olmi heat exchanger and to show how we can help improve your operation.

  • (PDF) ALUMINA YIELD IN THE BAYER PROCESS PAST, PRESENT AND ...

    Alumina Yield in the Bayer Process; Past, Present and Prospects Edited by TMS (The Minerals, Metals & Materials Society), 2007 ALUMINA YIELD IN THE BAYER PROCESS PAST, PRESENT AND PROSPECTS Roelof Den Hond1, Iwan Hiralal2, Ab Rijkeboer3 1 Alcor Technology, Clinckenburgh 10, 2343 JH Oegstgeest, The Netherlands 2 Hiracon, Prinses Irenelaan 2, 2273 DD Voorburg, The …

  • BAYER PROCESS - idc-online.com

    BAYER PROCESS Bayer process is the process of refining alumina. from bauxite (aluminum ore containing 30- ... The clear liquor is pumped from the settlers to the precipitators (thickening tanks) through heat exchangers, which transfer the heat from the solution to the cold spent (processed) liquor.

  • Characterisation of single-stream Bayer plant heat ...

    Bayer process heat exchangers cleaning efficiency: Optimizing the acid dissolution of sodalite scale P. Watkinson, H. Müller-Steinhagen, M.I. Reza Malayer (Eds.), Heat Exchanger Fouling and Cleaning — Fundamentals and Applications, Engineering Conferences International, Santa Fe, USA ( 2003 ), pp. 68 - 74

  • Determining silica solubility in bayer process liquor ...

    The efficient precipitation of dissolved silica from Bayer process liquor is essential for the production of high-quality alumina and the reduction of excessive scaling in the heat exchangers in the evaporation building of Bayer processes. The accurate prediction of silica solubility in Bayer liquor is one of the key parameters in improving the design and operation of the desilication process ...

  • OPTIMIZATION OF CLEANING EVAPORATOR TUBES IN BAYER PROCESS

    During Bayer process of Jajarm Alumina Complex, sodium aluminosilicate scales in different equipment, especially in thermal heat exchangers of condensation units of sodium aluminates. This leads to reducing total heat transfer coefficient and increasing energy consumption.

  • Productive and Sustainable Alumina Production - Light ...

    As DSP accumulates in Bayer process pipes, vessels, heat transfer equipment, and other process equipment, it forms flow bottlenecks and obstructions and can adversely affect liquor throughput. In addition because of its thermal conductivity properties, DSP scales on heat exchanger surfaces reduce the efficiency of heat exchangers.

  • CA2571354A1 - Precipitation of silica in a bayer process ...

    In the Bayer process for the production of alumina, problems are caused by silica dissolving in the caustic liquor. This silica arises from the presence of kaolin in the bauxite. A process for removing this kaolin comprises contacting the bauxite with sodium hydroxide solution to form a mixture, and subjecting the mixture to intense ultrasonic irradiation to cause cavitation; this can be ...

  • Bayer Process Heat Exchangers Cleaning Efficiency ...

    Fortin and Breault: Bayer Process Heat Exchangers Cleaning Efficiency Published by ECI Digital Archives, 2003. is generally added to the cleaning solution to minimize corrosion of the carbon steel tubes and the other parts in contact with the acid solution.

  • Sodalite Scale Control In Alumina Bayer Process | NACE ...

    Bayer process is a process of producing pure alumina (Al 2 O 3) from bauxite.It has been practiced in alumina industry for more than a century. The process includes three steps, namely, extraction of alumina (in hydroxide forms) from bauxite in caustic solution, precipitation of gibbsite (aluminium trihydroxide), and calcination of gibbsite into alumina.