Bayer red mud is a strong alkaline solid waste discharged during alumina production. Due to large emissions and strong alkalinity, red mud is now mostly dammed or buried, which not only occupies huge land but also contaminates the surrounding ecosystem, causing the risk of collapse and landslide. In addition to its overall utilization …

LÜ Zi-jian, BI Shi-wen, XIE Yan-li. Effect of sodium oxalate on processes of red mud sedimentation [J]. Journal of Materials and Metallurgy, 2006, 5(2): 105–108. (in Chinese) Google Scholar LÜ Zi-jian, BI Shi-wen, XIE Yan-li. Effects of para-phthatlic sodium on sedimentation of red mud [J].

Chapter 5. Liquid–Solid Separation: De-Sanding—Flocculation, Sedimentation and Liquor Filtration. Manfred Bach and Fred brunn AbstractPost-digestion, the solids and aluminum bearing liquor need to be sepa- rated, and the solids washed to remove and recover the bulk of the liquor. Sedimen- tation and filtration equipment are commonly ...

Bauxite residue (Red mud) is produced in alumina plants by the Bayer process in which Al-containing minerals are dissolved in hot NaOH. The global residue inventory reached an estimated 3.5 billion tons in 2014, increasing by approximately 120 million tons per annum. The appropriate management of bauxite residue is becoming a …

This review summarizes the mechanisms of passivation of heavy metals (HMs) in contaminated soil by RM, including precipitation, adsorption and ion exchange. …

Red mud is a by-product of alumina extraction from bauxite ore. It contains high quantities of alkali, minerals, and metal ions, which are typically pumped as thick slurry to a residue disposal area.

Incidental fall of a red mud repository dam like Ajka in Hungary leaves an unfavorable effect on the more noteworthy region because of the spreading of red mud particles over a huge territory. In this exploration, an endeavor has been made to control the dispersive idea of red mud and quickening sedimentation by including distinctive added ...

In recent years, the ecological safety issues of red mud tailings ponds have been frequent, with problems such as the seepage damage of anti-seepage materials at the bottom of tailings ponds, failure of anti-seepage systems, and leakage of pollutants. In order to deeply analyze the influence of red mud (RM) leachate on the microstructure of the …

Journal of Molecular Science. It was studied that the effects of the humic acid on properties of the mud sedimentation in bauxite.The effects of different concentration of humic acid on settlement rate,overflow clarity and download L/S were studied.And elimination of the negative effect of flocculate on the humic acid was also studied.

Red mud has the characteristics of fine particles, high viscosity, and slow settling speed, which will reduce the service life of the tailings dam. Drainage filter layer in the tailings pond can accelerate the consolidation of red mud drainage, ensure the stable operation of the tailings pond and increase the storage capacity utilization rate. In order …

Red mud is the bauxite residue generated from aluminum industries, and due to its low utilization rate, a large volume of red mud in slurry form is stored. The high …

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 ...

The results show that the red-mud precipitation velocity during the experiment with the emulsion flocculants is several time higher than the precipitation velocity obtained with synthetic flocculants.

Sedimentation processes are governed mainly by the flocculation and the settling of suspended particles, which are affected by many factors simultaneously. To …

Flocculation and separation of red mud is an integral part of the Bayer process. Over the latter half of the 20 th century, flocculant technology dramatically changed from natural starches to use of "rationally designed" polymers. Many of these advancements were due to the introduction of liquid or emulsion based flocculants which enabled elaborate post …

Red mud residue from alumina production has been proposed as an alternative liner material. The chemical and environmental compatibility of red mud upon exposure to representative organic (methanol, heptane, TCE, and acetic acid) and inorganic liquids (CaCl2 and seawater) was studied. Chemical compatibility assays …

Alam 2018 Dispersion and Sedimentation Characteristics of Red Mud - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

Study with Quizlet and memorize flashcards containing terms like Calcareous oozes of the open ocean are associated with midocean ridge and rise systems rather than the deep-ocean basin floor. T/F, Red mud or brown clay deposits are found under oceanic regions of high biological productivity., Large particles sink faster than …

In the wet processing, the red mud is first washed in a thickener to promote the sedimentation of the solids and obtain residue slurry with the solids content ranging between 15% and 30%. The residue slurry is then pumped into a storage yard created by dams, tailing ponds and other earthworks to allow the solids to deposit and the …

The red mud was found to be dispersive, which could be controlled through stabilization using biopolymer and NaCl. The sedimentation properties improved with the addition of NaCl and phosphogypsum and its impact on red mud pond management is discussed. The stabilization of red mud using other industrial waste like ground granulated blast ...

Sedimentation is the simplest separation method and an essential concept that is supposed to be understood. Its importance is unquestioned and plays a vital role in archeology. It's a natural process that can be explained as building up layers of small particles like sand or mud. Weight and sedimentation are very related.

This paper deals with the coagulation of red mud (a waste product from the Bayer process to produce alumina) in water with an inorganic coagulant (FeCl 3 ·6H 2 O). The coagulative state is evaluated by measuring the transmittance of supernatant liquid and/ or the specific volume of the sediment in suspensions after standing for 24 h.

In the jar tests with six pH levels and six dried red mud concentrations, tests with pH values of 3 and 5 resulted in reddish coloring in solutions due to sedimentation after coagulation. This indicated dissolution of red mud at acidic pH values.

Red mud has the characteristics of fine particles, high viscosity, and slow settling speed, which will reduce the service life of the tailings dam. Drainage filter layer in the tailings pond can accelerate the consolidation of red mud drainage, ensure the stable operation of the tailings pond and increase the storage capacity utilization rate. In order to quantify the …

In this paper characterization of red mud as a controlled low strength material (CLSM) is discussed with red mud as a base material and crusher dust or quarry dust, …

The average settling rate of red mud in the first 5 min and the turbidity of supernatant after settling for 30 min are 2.36 m/h and 507 NTU, respectively, at a flocculant dosage of 120 g/t, which ...

Sedimentation issue is associated with high-density cement slurries which use high specific gravity solids such as weighting materials. ... red mud, and furnace slag, as well as certain clays like ...

Compared with the red mud self-weight deposition, the results prove that the sedimentation rate of the red mud can be significantly increased under the geotextile filtration, and …

Sedimentation and separation of red mud is an extremely complicated physical and chemical process, The Bayer process dissolving pulp is a suspension formed by red mud and sodium aluminate solution. Due to the complex physical and chemical interactions between the red mud particles and the solution, the phase composition, distribution, …

In the column sedimentation test as described by Jaditager and Sivakugan (2017), the treated red mud slurry was poured into the transparent glass cylinder up to a height of 24 cm and allowed to ...