آخرین محصولات
Role of iron oxy-hydroxides on settling behaviour of red mud
The settling rates of all red muds were also measured. It was observed that the presence of goethite in the bauxite has a profound effect on the settling rate of the red mud produced in the Bayer ...
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Development of new polymer flocculant in the alumina industry
Target papers to improve the effect of red mud settling in the alumina production process, using complex initiation system, synthesized by controlling the polymerization process conditions, a relative molecular mass of sodium polyacrylate, and the trial production of industrialization, won the ideal sodium polyacrylate product.
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A study of iron mineral transformation to reduce red mud tailings
The settling of red mud can be improved by converting goethite into hematite and/or magnetite to produce a mud of larger particle size, smaller specific surface area, and larger specific gravity, characteristics which reduce the total volume of mud slurry to be disposed of and which allow for less potential contamination from caustic soda. This ...
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Use of Mixotrophic Bacteria as Flocculating Agents to Separate …
Settling Test. Red mud slurry was made from dried red mud mixed with tap water to obtain a final concentration of 20 g/L with a pH of the slurry of 10.83. Settling test was carried out in 100-mL graduated cylinders, each contained red mud slurry and bioflocculant with a volume ratio of 9:1. Sixty-two mixotroph bacterial strains were divided ...
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Effect of bauxite properties on the settling of red mud
The settling behaviour of the tailings is an important economic factor as it controls purity, and an important environmental factor as it controls final liquid content of the red mud tailings for disposal. In the Bayer process, the operating factors determining different settling rates are not at all clear. It is known that two bauxites from a ...
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Study on dealkalization and settling performance of red …
Abstract. At present, the dealkalization and comprehensive utilization of red mud is a worldwide problem. Studies on the settling performance and phase transformation …
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Red Mud Settling Flocculants; Latest News. Water-Absorption Principles and Categories of Water-retaining Agents ; Polyacrylamide is a Common Water Treatment Agent ; Polyacrylamide for Wastewater Treatment in Distillery ; Requirements for Selection of Polyacrylamide PAM for Wastewater Treatment
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Making-Red-Mud
The scourge of red mud burst into the public's eye in October 2010 when a settling pond in Hungary ruptured. A flash flood of red sludge gushed through several small towns, killing 10 people by ...
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Frontiers | Experimental Research on the Bearing Properties of Red Mud
Introduction. Red mud is an insoluble industrial solid waste from aluminum production plants (Luo et al., 2017).It is estimated that the total stockpile of red mud across the world is more than 3 billion tons and about 120 million tons of red mud are produced around the world per year, the comprehensive utilization of red mud is a worldwide …
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Study on dealkalization and settling performance of red …
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Synthesis of modified polyacrylamide with high content
The settling rate of red mud treated by PAM dissolved in 10 g/L NaOH solution is 0.61 m/h while by PAM dissolved in distilled water it is 1.31 m/h, because the adsorption ability of the hydrolyzed ...
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K-4 Impact on Dehydration Process of Red Mud Settling
Filtration washing of the red mud settling is characterized by three periods: expulsion, hydro-chemical humidification and molecular diffusion [22, 23]. Washing with K-4 application also has .
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Rheology modification of settled solids in mineral processing
The synthetic flocculating agents employed for the settling or filtration of red mud are generally water soluble polymers of one or more ethylenically-unsaturated monomers, and have been used together, as noted above, with starch and dextran for aluminate liquor clarification. The synthetic flocculating agents are usually anionic, and …
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Burntisland – Republic of Scotland
Red mud in Scotland (Sep 30 2016) The red mud eventually finds its way into settling ponds after treatment to remove the caustic and some of the water. A recent study published in Environmental Science and Technology looked at the environmental legacy left by the discharge of a red mud settling pond into a shallow loch or […]
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Red mud carbonation using carbon dioxide: Effects of carbonate …
Carbonation using CO 2 appears as an attractive solution for disposing of red mud suspensions, an aluminum industry hazardous waste since it also offers an option for CO 2 sequestration. Here we report the novel findings that CO 3 2-together with Ca 2+ can significantly affect the surface properties and settling of goethite, a major component of …
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CN1868932A
A settling process for removing sand from the red mud generated in preparing alumina features that on the basis that the top surface of settling bath is used as the sand remover of red mud, a hydrospinning unit and a rotary sieve are additionally used between the last washing-settling bath and the second one from the bottom, and said hydrospinning unit …
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Red mud carbonation using carbon dioxide: Effects of carbonate …
This study is necessary to predict the effect of CO 3 2− and Ca 2+ ions on the particle properties and settling of red mud, which can help to improve the disposal of red mud ultimately. 2. Experimental2.1. Materials and reagents (1) Goethite particles. Goethite is an α-iron (III) hydroxy-oxide mineral with the chemical formula FeOOH. A ...
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Red Mud Project
T ECHNOLOGY N OTE Alumina Factors affecting red mud settling (Part I) To maximize alumina production, it is vital that red mud be separated from sodium aluminate liquor to the fullest extent possible. While many factors influence the effectiveness of separation and settling of red mud, Cytec's experience has shown that the following …
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Industrial Municipal Wastewater Treatment: Sludge Thickening
Red Mud Settling Flocculants; Latest News. Water-Absorption Principles and Categories of Water-retaining Agents ; Polyacrylamide is a Common Water Treatment Agent ; Polyacrylamide for Wastewater Treatment in Distillery ; Requirements for Selection of Polyacrylamide PAM for Wastewater Treatment
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(PDF) Use of Mixotrophic Bacteria as Flocculating Agents to …
After one hour, all bacterial strains showed that above 70% weight of red mud was settled. The best result was 93.59% w/w that could be recovered with the bioflocculant Paenibacillus pasadenensis.
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Negative effects of dissolved organic compounds on settling …
Goethite, a typical iron-containing monomineral in red mud, was synthesized under the simulated Bayer digestion condition during the alumina production. The effects of dissolved organic compounds including sodium formate, sodium acetate, sodium oxalate, sodium salicylate and disodium phthalate on the settling performance of goethite slurries ...
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Mechanical dewatering of red mud
Red mud cake with high solids content provides several benefits such as long-term storage, future utilization for the recovery of valuable metals such as aluminium, iron, titanium, and rear earth elements. ... HXPAM has been the choicest flocculant used worldwide in red mud settling. The Performance advantages associated with the use of …
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The speed of the red mud pulp lightening with optimal K-4 doze is 16,8 mm /min in the interval of the flocculant concentration 0,10 – 0,50 %. Filtration washing of the red mud settling is characterized by three periods: expulsion, hydro-chemical humidification and molecular diffusion [22, 23]. Washing with K-4 application also has
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Numerical simulation and optimization of red mud separation …
agglomerates' formation and improve the red mud settling speed. Furthermore, the additional power of recirculation pump can be saved and flocculants dosage was reduced from 105g/t to 85g/t in the operation. Key words: separation thickener; self-dilute feed system; numerical simulation; optimization experiments; computational fluid dynamics
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Red Mud Settling Flocculants
SINOFLOC red mud setting flocculants is used for settling aluminum red mud slurries in alumina plants, which provide high settling rates, better separation performance …
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Effects of Polymeric Flocculants on Settlement of Bayer Red Mud ... EN English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian …
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pH In Drilling Mud Testing Procedures
2. Wait until the sample is at the same temperature as the calibration buffer solution and the probe, preferably 70-80°F (20-28°C). 3. Measure the temperature of the pH 7 buffer solution. 4. Place the probe in the pH 7 buffer solution, switch on the pH meter and wait for the digital reading to stabilize. 5.
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Red mud handling process and processing system in a kind of …
Red mud handling process proposed by the present invention, plate and frame filter press is washed with water and instead of tradition sedimentation trough washery, sheet frame pressure Filter filters, and whole system only washes subsider with one one, eliminates three washing settling grooves of red mud while decreases three …
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Washing, settling and separation method for Bayer red mud
The invention relates to a washing, settling and separation method for Bayer red mud. The method is used for the alumina production industry and is an improvement of washing and separation methods for the Bayer red mud. The method is characterized in that the washing, settling and separation refers to that a settling tank device is additionally …
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Characterization of Settled Particles of the Red Mud …
In Aluminium refinery, generally, synthetic flocculants are used for facilitating the red mud waste particles to settle in settlers and washers during washing of …
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