bayer process red mud washing

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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 - 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 ...

DYNAMIC SIMULATION OF RED MUD WASHERS USED IN …

In the Bayer Process an insoluble sub-product is formed as a result of the digestion of the bauxite ore with caustic soda. This product is called "red mud" and it has to be continuously removed by settlers or thickeners/clarifiers. This project proposes the simulation of a continuous thickener/clarifier in order to

Bayer Process: Manufacturing Of Alumina | Making of Alumina

History of the Bayer Process: Bayer process was invented by Austrian chemist, Carl Josef Bayer in 1887, while working in Saint Petersburg, Russia for developing a method to supply alumina to the textile industry. The Bayer process started gaining importance after the invention of Hall-Heroult aluminium process.

US Patent for Red mud dewatering and washing process ...

FIELD OF THE INVENTION. 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.

Dewatering of red mud. - Centers for Disease Control and ...

Dewatering of red mud. Authors ... the caustic-containing residue generated when alumina is extracted from bauxite by the Bayer process. 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 ...

Alumina: Filtration in the alumina production process ...

4. EXISTING WAGERUP REFINERY 4.1 ALUMINA REFINING PROCESS ... Approximately halfway through the mud washing process the overflow stream is heated and contacted with lime slurry. This is known as the causticisation process, where a portion of the ... added throughout the Bayer process (such as flocculants). This organic matter reacts to form

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.

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 reduce the viscosity of the slurry.

Red Mud Settling Flocculants - Extraction Of Aluminium ...

SINOFLOC 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 in this process, the lower the cost of red mud separation.

FLOW SHEET OPTIMIZATION BY THE CONCEPT OF …

A 7.40 % decrease on the amount of red mud produced on dry basis per kg of hydrate was found to be achievable. Optimum operating temperature for the digester was calculated as 277.3 °C. Keywords: Alumina, Bayer Process, Sustainable Development, Red Mud, Environment Protection, Process …

US6033579A - Red mud dewatering and washing process ...

FIELD OF THE INVENTION. 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.

Dealing with Red Mud - By - Product of the Bayer Process ...

Jul 08, 2003· Red mud is a by-product of bauxite processing via the Bayer process. Described herein is a process that converts the red mud into mineral products that can be used for commercial applications.

Red mud dewatering and washing process - Andritz ...

Mar 07, 2000· FIELD OF THE INVENTION. 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.

Bayer Process - an overview | ScienceDirect Topics

20.7.2 Red mud/Bayer process hazardous waste. ... The Bayer process extracts alumina by caustic digestion of crushed bauxite at high temperature and pressure in an autoclave, followed by clarification, precipitation, washing and finally calcination to produce pure anhydrous alumina. Some aluminium producers own, or partly own, alumina ...

OUTOTEC ALUMINA SOLUTIONS

Mud separation Precipitation Grinding Bauxite Red mud Pre-desilication Seed Mud washing Mud disposal Hydrate washing and filtration Calcination Alumina silo Lime Cooling water Cooling water Steam Condensate Steam Flocculent Steam Steam Caustic Lime Flocculent Condensate Outotec solution Simplified Bayer process for alumina production ...

Red Mud Disposal: The Ecological Concern ... - AlCircle Blog

Oct 11, 2012· The problem can be minimized by washing and filtering the red mud repeatedly, evaporating the liquid and putting back the thickened slurry in the same pond after using clay beds of up to 300-400 mm thickness at the bottom and, and most of the modern day alumina refineries have adopted this process. Still red mud ponds turn out to be a threat ...

A NOVEL RED MUD TREATMENT PROCESS - NTUA

The Bayer process (Jürgen Buschow K.H. et al., 2001), patented in 1888 by ... The novel red mud treatment process however aims at turning all of the red mud waste into valuable products and this includes transforming the EAF slag into inorganic fibers suitable for

EVALUATION OF PROPERTIES OF FRESH AND WASHED …

"EVALUATION OF PROPERTIES OF FRESH AND WASHED RED MUD" ... The repeated washing of red mud is done in the laboratory to simulate the field leaching conditions. The ... (Bauxite Residue) is a by-product of Bayer‟s process. Red Mud is highly alkaline and poses number of environmental and health risks (Suresh, C. et al ...

Mining and Refining – Bauxite Residue Management

Bauxite residue is a by-product of the Bayer Process. ... The high concentration of iron compounds in the bauxite gives the by-product its characteristic red colour, and hence its common name "Red Mud". ... After washing, the residue is contained in special facilities known as Bauxite Residue Disposal Areas (BRDA) or Residue Storage Areas ...

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 ...

Control of counter-current washing operation in alumina ...

Entrapped caustic liquor in the red mud residue, a by-product of the Bayer Process used to produce alumina from bauxite ores, is recovered in a series of counter-current, multi-stage washer trains using the process diluting liquor.

Mining and Refining – Process

The Bayer Process is the most economic means of obtaining alumina from bauxite. Other processes for obtaining alumina from metal ores are also in use in some refineries, particularly in China and Russia, although these make up a relatively small percentage of global production. The process …

COMPOSITION AND CHARACTERISTICS OF RED MUD: A …

Bayer's process. 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 year. Right now, it is stored in a nearby disposal area.

Programme BR2018 – BR 2018 Conference – Red Mud

Implementation and optimization of filter press in red mud washing process at ETI Aluminyum. ETI Aluminyum Inc. Seydisehir (Turkey) 10:40: Andrei GORONOVSKI 1, Johannes VIND 2,3, Vicky VASSILIADOU 2, Dimitrios PANIAS 3, Alan H. TKACZYK 1 Presentation / Paper. Distribution of uranium, thorium and potassium in the Bayer process

Extraction Process of Aluminium from Bauxite Ore

The flowsheet in this study illustrates only the following two steps in the modified Bayer Process: grinding and digestion of bauxite in the sodium aluminate liquor,; separation and washing of the coarse red mud residue from the sodium aluminate liquor.

Template_paper_proceedings_3rd_Slag_Valor_Symposium

Following these trials, ETI invested in an automatic horizontal press filter in the red mud washing cycle. This paper describes the performance, operation and parameters of the new red mud handling process with press filter in ETI. Keywords: Bayer process, red mud, bauxite residue, filter press, dewatering, process optimization. Introduction

Electrodewatering of Muds

A voluminous and troublesome red mud waste is generated when bauxite is leached with caustic to recover alumina by the Bayer process. The mud is composed primarily of fine grained iron oxides, in particular hematite and goethite. Because of its near colloidal nature, the mud is slow settling and difficult to wash.

Bayer process chemistry - Amazon S3

The insoluble red mud from the first settling stage is thickened and washed to recover the caustic soda, which is then recycled back into the main process. The mud is washed with fresh water in counter-current washing trains to recover the soda and alumina content in the mud before being pumped to large disposal dams. Precipitation

TENORM: Bauxite and Alumina Production Wastes | US EPA

The Bayer Process. The Bayer Process, which is used by about 80 active plants worldwide, is the primary method of producing aluminum from bauxite. Bauxite ore is dissolved in sodium hydroxide, or lye, at a high temperature and pressure. Then, the alumina and bauxite ores are separated by washing out the waste (red muds or sands) from the alumina.