bayer process red mud washing

bayer process red mud washing

US9199855B2 - Chemical treatment to improve red mud ...

The invention provides methods and compositions for improving the rheology of red mud removed from Bayer Process liquor. The method includes adding a flocculant and a cross-linked polysaccharide to the liquor. This combination separates the red mud from the liquor but also prevents the red mud from becoming too thick. By preventing excessive thickness, the method allows for the formation of ...

US5043077A - Treatment of bayer process red mud slurries ...

A method of treating Bayer process red mud slurries to improve or facilitate the handling thereof, comprising adding to such a slurry a minor porportion of humic acids or humates effective to...

WO1997029992A1 - Red mud processing - Google Patents

Soda and/or alumina values are recovered from sodium-aluminium-silicate desilication product (DSP) found in red mud formed in a Bayer process. DSP is mechanically activated to induce a mechanochemical reaction whereby soda and/or alumina values are solubilised.

US5346628A - Polymers for flocculating red mud from bayer ...

238000004131 Bayer process Methods 0.000 title claims abstract description 24 230000003311 flocculating Effects 0.000 title description 4 Red mud is flocculated from Bayer process liquors using a polymer which contains vinylamine and/or vinylformamide.

Disposal – Red Mud Project

The title of the patent is “Treatment and disposal of red mud generated in the Bayer Process”, AU701874. The inventors propose a process that produces a RM cake low in caustic and alumina concentration permitting environmentally friendly disposal.

ARTICLE: Addressing the Challenge of Bauxite Residue ...

Mar 11, 2019 · The largest waste by-product generated in the Bayer bauxite refining process is bauxite residue, commonly called red mud. An enormous quantity of caustic red mud is generated worldwide every year, posing a very serious and alarming environmental and safety problem.

US6033579A - Red mud dewatering and washing process ...

US6033579A US08/817,207 US81720797A US6033579A US 6033579 A US6033579 A US 6033579A US 81720797 A US81720797 A US 81720797A US 6033579 A US6033579 A US 6033579A Authority US United States Prior art keywords filter filter cake washing red mud washing fluid Prior art date 1994-10-14 Legal status (The legal status is an assumption and is not a legal conclusion.

Alumina: Filtration in the alumina production process ...

Jun 18, 2010 · Filtration in the process – red mud In most circumstances, plants use vacuum filters, usually drum filters, for the final washing and de-liquoring of red mud before it is sent to a waste area. In this process, the solids are waste and the liquor valuable.

4. EXISTING WAGERUP REFINERY 4.1 ALUMINA REFINING

Wagerup refinery uses the Bayer process to refine alumina from bauxite ore. This involves a number of key steps, including: ... Approximately halfway through the mud washing process the overflow stream is heated and ... (red mud) as a soil amendment within the Peel-Harvey

Removal of carbonate and oxalate pollutants in the Bayer ...

Apr 01, 2015 · In this process, bauxite is mixed with lime and concentrated caustic soda solution at high temperature to dissolve alumina in caustic liquor. Then, the insoluble substances, named red mud, are separated from the sodium aluminate solution and disposed into special ponds. Sodium aluminate solution is sent to the precipitation stage.

US Patent for Chemical treatment to improve red mud ...

Chemical treatment to improve red mud separation and washing in the bayer process . Dec 28, 2012 - Nalco Company. The invention provides methods and compositions for improving the rheology of red mud removed from Bayer Process liquor. The method includes adding a flocculant and a cross-linked polysaccharide to the liquor.

Red mud - Wikipedia

Red mud, now more frequently termed bauxite residue, is an industrial waste generated during the processing of bauxite into alumina using the Bayer process.It is composed of various oxide compounds, including the iron oxides which give its red colour. Over 95% of the alumina produced globally is through the Bayer process; for every tonne of alumina produced, approximately 1 to 1.5 tonnes of ...

Production – Red Mud Project

Jul 13, 2005 · Production. Red Mud is produced during the Bayer Process. With this process, we can extract the aluminum (oxy)hydroxides from bauxites and get alumina, which eventually can be smelted and give aluminum. In 1888, Karl Josef Bayer developed and patented a process, which has become the cornerstone of the aluminium production industry worldwide.

Method for dissolving Bayer process red mud - Patent CN ...

CN-102757060-B chemical patent summary.

Red mud dewatering and washing process - Andritz ...

Oct 16, 1997 · The invention covers a process for filtration and washing of red mud, if applicable with addition of sand, in particular from the Bayer process for aluminum production from bauxite, in which filters are used and caustic is washed out on the filter.

Disposal – Red Mud Project

The title of the patent is “Treatment and disposal of red mud generated in the Bayer Process”, AU701874. The inventors propose a process that produces a RM cake low in caustic and alumina concentration permitting environmentally friendly disposal. Quite recently, the Virotec International Ltd. (Australia), announcened a treatment process ...

Bayer Process - an overview | ScienceDirect Topics

Red Mud is a by-product produced during the Bayer process of refining of bauxite to produce aluminum (2 tons of red mud remains after production of 1 ton of aluminum). 58 It contains metallic oxides. 58 The red color results from iron oxide (~60% of its mass). 58 The massive quantities generated trigger efforts of finding suitable uses for red mud.

Chemical treatment to improve red mud separation and ...

The invention claimed is: 1. A method of treating a Bayer Process slurry containing comprising liquor and red mud, the method comprising: (a) adding to the slurry a flocculant and a cross-linked polysaccharide and (b) removing flocculated red mud contained in the slurry by at least one of: sedimentation, centrifugation, filtration, washing, and settling.

Recovery of sodium aluminate from Bayer process red mud ...

A process for recovery of valuable products from Bayer process red mud comprises the steps: (a) digesting red mud with sulphur dioxide in the presence of water to dissolve soda, alumina and silica therein; (b) heating the product of step (a), with or without prior removal of insolubles, to selectively precipitate silica, and removing solids including the precipitated silica, to produce a ...

4. EXISTING WAGERUP REFINERY 4.1 ALUMINA REFINING

Wagerup refinery uses the Bayer process to refine alumina from bauxite ore. This involves a number of key steps, including: ... Approximately halfway through the mud washing process the overflow stream is heated and ... (red mud) as a soil amendment within the Peel-Harvey

Alclar® Alumina Flocculants - BASF

BASF solutions are used in milling, digestion, clarification, mud washing, liquor filtration, precipitation, hydrate thickening, evaporation and hydrate filtration. ALCLAR - A range of synthetic flocculants developed specifically for the flocculation of red mud in the manufacture of alumina by the alkaline digestion of bauxite (Bayer Process).

decanter for separation of bauxite

Improved Process For Separating Red Mud In Improved Process For Producing Alumina From Bauxite. in the bayer process for producing alumina from bauxite, 20 decanter plus polish filter combination where separation is carried out bauxite in solid form as red mud. the red mud is. j separated from the digested slurry to obtain a. ^ caustic-aluminate pregnant liquor, alumina hydrate ,improved ...

Removal of carbonate and oxalate pollutants in the Bayer ...

Apr 01, 2015 · The bauxite is the main source of organics in the Bayer process (Xiao et al., 2007a, Xiao et al., 2007b, Ellis et al., 2002, McSweeney et al., 2011).In addition to organic compounds, there are inorganic materials such as sodium carbonate and sulfate, which are formed during the digestion either by dissolution of the salts or minerals or from degradation of the organic compounds containing ...

Red Mud Flocculants Used in the Bayer Process | SpringerLink

Abstract. 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-reaction chemistry to be ...

Hydrometallurgical Recycling of Red Mud to Produce ...

Aug 02, 2021 · Red mud is a polymetallic waste generated during Bayer's process of alumina production. High alkalinity (pH > 11), multiple elements, and micron-sized particles make red mud recycling energy-intensive and challenging. The following work presents a hydrometallurgical flowsheet for separation of different red mud elements and recovery of high purity Fe (II) product using cost

Method for dissolving Bayer process red mud - Patent CN ...

CN-102757060-B chemical patent summary.

Red Mud Flocculants Used in the Bayer Process | SpringerLink

Abstract. 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-reaction chemistry to be ...

The composition, recycling and utilisation of Bayer red mud

Abstract. Red mud or bauxite residue is a solid waste generated from the Bayer process. The disposal of red mud leads to a serious environmental threat because of its tiny particle size and high alkaline value. The utilisation and recycling of red mud is currently a crucial issue and needs to be addressed as soon as possible.

Red mud – addressing the problem – Aluminium Insider

Nov 15, 2016 · A waste by product of the Bayer process for producing al oxide from the bauxite ore, red mud contains toxic heavy metals and its high alkalinity makes it extremely corrosive and damaging to soil and life forms, presenting a massive problem for disposal. Toxic dumps and settling pools are a feature alongside all bauxite/alumina plants worldwide ...

Bayer process - Wikipedia

The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide) and was developed by Carl Josef Bayer.Bauxite, the most important ore of aluminium, contains only 30–60% aluminium oxide (Al 2 O 3), the rest being a mixture of silica, various iron oxides, and titanium dioxide. The aluminium oxide must be purified before it can be refined to ...

Environmental Safety Analysis of Red Mud-Based Cemented ...

Taking an alumina plant in Shanxi province as an example (see Figure 1), the Bayer process mainly includes the crushing and pulping of bauxite ore, high-pressure digestion of aluminum oxide, separation and washing of red mud, and other production processes. The principle of the Bayer process is dissolving the alumina in bauxite ore with ...

Method of activation of red mud - SHIAO; SHING-JEN

It is well known that process for activating red mud from the Bayer process by baking an intimate mixture of red mud and of a caustic soda lye, at a temperature lower than 600° C, then crushing and lixivating the product with hot water is disclosed in U.S. Pat. No. 2,432,071.

Mining and Refining – Bauxite Residue Management

Bauxite residue is a by-product of the Bayer Process. It is primarily composed of the insoluble fraction of the bauxite ore that remains after extraction of the aluminium-containing components. Iron oxides (10 – 30%), titanium dioxide (2 – 15%), silicon oxide (5 – 20%) and undissolved alumina (0 – 20%) make up the residue, together with ...

RRA Red Mud Flocculants | Ecolab

Red mud removal requires the use of flocculants effective in bridging and entrapping fine red mud solids to rapidly separate the solids from the saturated liquor. This separation process occurs via decantation and subsequently in multiple counter current washing stages to reclaim soluble alumina and soda.

COMPOSITION AND CHARACTERISTICS OF RED MUD: A CASE

An alumina refinery built in Tayan, West Kalimantan has a production capacity of 300 thousand tons per year. It means that it will produce red mud or bauxite residue approximately 300 – 350 thousand tons per year and washing residue around 200 thousand tons per

decanter for separation of bauxite

Improved Process For Separating Red Mud In Improved Process For Producing Alumina From Bauxite. in the bayer process for producing alumina from bauxite, 20 decanter plus polish filter combination where separation is carried out bauxite in solid form as red mud. the red mud is. j separated from the digested slurry to obtain a. ^ caustic-aluminate pregnant liquor, alumina hydrate ,improved ...

Polyacrylamide for Red Mud Settling Flocculants - China ...

Apr 02, 2021 · WELLDONEFLOC® products could be used in alumina bayer process. Red mud settling requires using the efficient flocculants to bridge and entrap the find red mud solids to separate the solids from liquor rapidly. The more efficient of our flocculants

Red mud | Article about red mud by The Free Dictionary

Depending on the bauxite ore used and operational parameters within the Bayer process, residues may be dominated by a coarse-textured fraction (residue sand) or a fine-textured residue (red mud) (Courtney and Timpson 2005b; Wehr et al.