Magyar Aluminiumipari Troszt

Almasfuzitoi Timfoldgyar

Aluminiumipari Tervezo Es Kutato Intezet

Mta Geokemiai Kutatolaboratorium

Ferenc Toth

Laszlo Revesz

Mihaly Miskei

Miklos Schlegel

Jozsef Zoldi

Jozsef Matyasi

Maria Orban Nee Kelemen

Gyula Odor

Bela Szabo

Gabor Sinka

Janso Steiner

Benjaminne Toth

Lajos Szucs

Lajos Szoke

Janosne Losonczi

Ferenc Weiszengruber

Tamas Lakatos

Frigyes Csapo

Janos Szolnoki

Mihaly Marton

According to the invention, the grains of the hydrate slurry are separated by sedimentation where the dispersed bubbles of air are removed in course of the presizing, then a supplementary sizing is carried out. Preferably, a liquid free from hydrate grains is fed in to stream against the sinking grains. This liquid is advantageously the spent liquor of the hydrate filter. The apparatus according to the invention consists of a container with conical bottom, a feeding device, a slurry outlet stub and an overflow channel. The inlet stubs of the feeding device, however, are placed off-center and every stub is connected with a presizing equipment. This equipment is composed of a bundle of pipes and/or a pack of plates which are slop placed to geometrical axis: At the upper part of the presizing equipment there is a foam overflow apparatus. The bottom of each presizing equipment is connected with a common cone-frustum type deflector casing. The casing is concentric with the container. There is ring shape gap between the upper edge of the deflector casing and the cylinder jacket of the container. Under the deflector casing there is an upwards convex control cone. The control cone is vertically adjustable and concentric with the deflector casing.

Process and apparatus for grain-sizing in alumina hydrate slurry

The invention relates to a new a method for simultaneous recovering vanadium, molybdenum and gallium from alumina factory aluminate liquors. The recovering is carried out in one step by electrolyzing an alumina factory aluminate liquor a temperature exceeding 70.degree. C. with a current density of from 400 to 1200 A/m.sup.2 using a low-melting liquid alloy as a cathode and agitating said alloy mechanically. By using the new process the three precious metals can be recovered simultaneously in one step with good efficiencies without any preliminary treating of the aluminate liquor and without using any auxiliary chemical.

Process for simultaneous recovery of vanadium, molybdenum and gallium

The invention relates to a new method of reducing the organic substance content of alum earth production cycle performed according to the Bayer technology. By the method of the invention the majority of the organic substances present in the circulating lye can be removed easily and with only slight losses in sodium content. According to the invention one proceeds so that soda present in the hydrate wash and/or in the soda salt solution is caustified with lime, the solution is evaporated to reach a total sodium oxide concentration of 200 to 400 g/l, the precipitated solid is separated and removed from the system, and the liquid is recycled.

Method of decreasing the organic substance content of alum earth

The invention relates to a novel process for the selective recovery of the sodium content of red mud originating from alumina plants. According to the process of the invention red mud or a slurry thereof is admixed with a ferric sulfate solution, the resulting suspension is stirred intensively for 0.5 to 1 hour at 15 to 85.degree. C, thereafter, if necessary, the pH of the suspension is adjusted to 4.4 to 4.6 and the solid substance is removed from the suspension. Using the process of the invention the sodium oxide content of red mud can be reduced to below 1.5%.

Process for the selective separation of the bound sodium content of red

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Almasfuzito, Hungary

Ferenc Toth