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The red symbols are derived using obtained from the flocculated experiments fl1fl4 and the properties of the primary particles.As all k s estimates shown in figure 7 use the particle size distribution of the primary particles they all have the same a 0.
2 m bed flocculated 5 m bed flocculated feed concentration gel point flocculated pe factor 16.3 figure 3 red mud thickener performance and model prediction of the solids flux versus observed underflow solids volume fraction.The difference between predicted and actual performance is indicated as a performance enhancement.
Red mud treatment zeta potential curves for the red mud sample and natural polymers are shown in the figure 2.The red mud particles and chitosan had similar surface charges in the entire ph range studied.For the ha, the surface charges were the opposite to those of the red mud.
A flocculated suspension can be deflocculated by lowering the salinity.This deflocculation takes place when the salinity falls down 2.5 ppt and flocculation above 20 ppt.Between these two salinity range, the flocculated mud gets deflocculated and kept in suspension, thus become the responsible factor for formation of mud banks.
It was found that sodium laurate, prepared with an excess of sodium hydroxide was found to be effective while direct addition of anionic surfactants lauric acid and sodium laureth sulphate and cationic cetyl trimethyl ammonium bromide produce only moderate effect on the red mud suspension apparent viscosity at 65 oc.
Red mud thickener tender example sentences with quotmud thickenerquot, translation memory.Add example.En from a drying filter 6, the lime mud thickened to a dry solids content of over 75 , preferably to 80 , is introduced into a feed chamber 2 through which an adjustable portion of the flue gas is conducted.
Measurement of the rheological property of bauxite residue sample received from an australian alumina refinery, treated with a number of cationic and anionic surfactant in laboratory has been carried out using a brookfield viscometer for the assessment of the effect of surfactants on the residue viscosity.
Keywords thickener, red mud, cfd modeling, hindered sedimentation, effective compressive yield stress, particle size distribution psd.
Abstract.Red mud waste is generally transferred to the storage area in a slurry form with solids content varying from 15 to 40.Due to arise of a variety of environmental and climatic conditions in the due course of time, settling behaviour of particles as well as properties of settled particles changes.
Dynamic simulation of red mud washers used in aluminum industries ardila, a 2010, dynamic simulation of red mud washers used in aluminum industries, masters by research, civil, environmental and chemical engineering, rmit university.Based on kinematic modelling of sedimentation extended to flocculated suspensions.
Synonyms for flocculated in free thesaurus.Antonyms for flocculated.4 words related to flocculate change, alter, change, modify.What are synonyms for flocculated.
Nioshtic-2 publications search.Red mud obtained from jamaican bauxite was dewatered in laboratory batch tests and small-scale continuous tests to develop an inexpensive method of washing the mud and recovering the valuable sodium aluminate and caustic.The flocculated red mud was placed in a column fitted with a screen to allow.
For clays and red mud 5 and correlated the adsorption of the polymer with the electro-negativity index.Polyethylene oxide itself has been a widely used polymer in several systems and its characteristics have been the subject of several reviews 6,7.The present work focuses on the adsorption of poly-ethylene oxide on clay and the constituent.
Citeseerx - document details isaac councill, lee giles, pradeep teregowda red mud is a waste product of bayer process.The composition of the red mud is mostly oxides of iron, titanium, soda-alumina-silicate compounds, unreacted quartz, and other insolubles in the bauxite.It must be removed from the pregnant caustic liquor prior to precipitation or impurities will be present in the final.
Red mud dewaterability was used for the prediction of rotary drum filtration performance, highlighting the effect of changes in process variables and potential directions for process optimisation.End of washer train red mud dewaterability was used in.
In order to acquire the flow pattern and investigate the settling behavior of the red mud in the separation thickener, computational fluid dynamics cfd, custom subroutines and agglomerates settling theory were employed to simulate the three-dimensional flow field in an industrial scale thickener with the introduction of a self-dilute feed system.
Red mud waste rmw is a solid residue generated during the extraction of alumina from bauxite ore by bayers process.A substantial amount of hot caustic soda naoh is added during the process of extraction of alumina, resulting in the generation of residue possessing a very high alkalinity, with ph ranging from 105 to 13.
The results show that red mud as well as red mud fly ash improves the geotechnical properties of the soil.Key words expansive soil, red mud, fly ash, lime, ucs.1.Introduction red mud is a by-product of the bayer process, which is used for the production of alumina from bauxite.In india, about 4.71 million tons of red mud is produced.
Red mud slurry is disposed at 30 ww solids and less than 3 gl na2o.Eti is focusing its efforts in maximizing extraction efficiency in digestion and improving decomposers yield.The red mud area is one of the most important topics that require serious.
Red mud thickening in the alumina industry is shown in figure 3.The modelling data is for two bed heights, namely 2 and 5 meters.The input data for the model was measured on-site using samples taken from the underflow and re-flocculated using the same dose of polymer as in the actual device.8 paste 2006, limerick, ireland.
Dynamic simulation of red mud washers used in aluminum industries by alexander ardila labiosa b.Eng chemical submitted in total fulfilment of the requirements of the degree of master in chemical engineering school of civil, environmental and chemical engineering rmit university victoria, 3000, australia march, 2010.
Cement and red mud mixture have changed the structure of red mud into flocculated structure thereby increasing the strength of the mixture.Increase in tensile strength for the red mud-cement mix was observed with increase in dosage as well as curing period.Achievement of high strength values of red mud-cement.
Tailings red mud 2,3, depending on the quality of the bauxite ore.However, applying the mean ratio of 1.5 t, in 2016 alone brazil generated about 16.5 million tons of red mud.Red mud is a mineral residue resulting from the alkaline processing of bauxite to produce alumina.
The red mud ph was found to be approximately 12 while the neutralised mud was about 8.5.The samples received were used directly and no attempt was made to alter the structure of the flocculated particles e.G.Stirring or adding more flocculant.For the preparation of suspensions at higher concentrations, the original mud was allowed to.
The batch settling behaviour of lightly flocculated red mud in inclined tubes has been investigated experimentally.A simple model is proposed which describes the behaviour observed for this suspension better than models at present available from the literature.
Us4545902a us06650,955 us65095584a us4545902a us 4545902 a us4545902 a us 4545902a us 65095584 a us65095584 a us 65095584a us 4545902 a us4545902 a us 4545902a authority us united states prior art keywords weight acrylic acid red mud alumina polymer prior art date legal status the legal status is an assumption and is not a legal conclusion.
Flocculant polymers and their influence on red mud thickening and filtration for dry disposal.Four flocculant polymers - anionic r-10 and r-90 and cationic m-7990 and z-7565, with dosages of 80, 140 and 200 gt, were tested for particle aggregation, aiming to improve settling velocity and release of water from the flocculated sediment.