Red mud crushing method

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  Methods for Utilization of Red Mud and Its Management

  — Introduction Red mud RM is a solid caustic waste or a by product formed after the digestion of bauxite ore with sodium hydroxide in a solution of concentrated NaOH at 150 230°C under pressure in Bayer s process for the extraction of alumina Kurniawan et al 2006 Zhang et al 2011 During the digestion process aluminum

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  Bayer Process an overview ScienceDirect Topics

  The solids red mud and red sand are countercurrent washed to recover the caustic solutions then pumped to specially designed impoundment beds The mud and sand can be intercepted neutralized washed and stored for reuse [3 8 38 40] The valuable caustic liquor is recovered via an underdrain system and returned to the Bayer process circuit

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  Recovery of alkali and alumina from Bayer red mud by the

  — Red mud produced in the Bayer process is a hazardous solid waste because of its high alkalinity; however it is rich in valuable components such as titanium iron and aluminum In this study a novel calcification carbonation method was developed to recover alkali and alumina from Bayer red mud under mild reaction conditions Batch

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  Homogeneous precipitation method preparation of modified red mud

  Red mud modified by an acid digestion and alkali reprecipitation approach was employed as support for the preparation of Ni/MRM catalysts using the homogeneous precipitation method The textural and structural properties of the as received red mud RM the modified red mud MRM and the as prepared Ni/MRM c

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  Preparation and curing method of red mud calcium carbide

  — The commercial alkali activators could account for more than 50% of the cost for producing geopolymers Thus to lower the carbon footprint of geopolymer by avoiding the utilization of energy intensive commercial alkali activators a novel eco friendly geopolymer was synthesized from 100% solid wastes comprising red mud RM calcium

  Applications of red mud as an environmental remediation material A

  — The benefits of utilizing red mud as an adsorbent include its low cost the high sufficiency of raw materials and the simple operation process The common activation method of red mud adsorbent is introduced below and then the application of red mud to the removal of various water pollutants is introduced Red mud activation method

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  Sustainable utilization of bauxite residue Red Mud as a

  — Because red mud possesses a certain amount of Al 2 O 3 and SiO 2 it has the potential to be applied as a raw material for geopolymer preparation Red mud and class F fly ash can be selected to produce geopolymer stabilized aggregate base and the influence of curing conditions temperature and moisture on final material strength was

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  Structural improvement of age hardened gypsum treated bauxite red mud

  — Several years 7 after incidental lithification by added gypsum the effect of crushing and phyto organics on some physical properties of red mud wastes RMW was examined under laboratory conditions It was hypothesized that mechanically breaking up the hardened masses would increase their permeability However on the contrary

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  Iron extracted from hazardous waste of aluminium

  — Figure 1 A reservoir of red mud This dam near the town of Alumínio Brazil contains 25 million cubic metres of hazardous waste from aluminium production

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  Artificial alkali activated aggregates developed from wastes

  — Considering the above mentioned concerns turning unutilized wastes into artificial aggregates for use in concrete has become a worthy topic Currently the common manufacturing methods of artificial aggregates include cold bonding and sintering Bijen 1986 The cold bonding method typically utilizes cementitious materials such as cement

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  A simple but effective method for the enrichment of Al in red mud

  Sodium salts were loaded onto red mud samples using the mechanical mixing method where red mud and sodium salt were mixed with molar ratios of Na/Al of 1 and corresponding to mass fractions of Na 2 CO 3 of 23 wt% 26 wt% 29 wt% 32 wt% 35 wt% all the Na in this portion is from Na 2 CO 3 The mixing process lasted for

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  A Review on Comprehensive Utilization of Red

  — Red mud is an industrial residue generated during the Bayer process of alumina production Jones and Haynes 2011 For each ton of alumina approximately 1 metric tons of red mud are produced Kumar et al 2006 About 140 million tons of bauxite residue are generated every year which are normally placed in huge tailing ponds in

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  Efficient Selective Extraction of Scandium from Red Mud

  — The huge reserves of red mud have a significant potential source of scandium The scandium can be recovered from red mud by direct acid leaching but the extraction yields are generally low and

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