RU2673831C1 - Boiled diluted pulp classification system - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to the hydrometallurgical production equipment and is intended to perform the classification process by to the various suspensions solid phase dispersed composition and can also be used in other areas of industry, where contained in the suspension solid phase classification is required. Boiled diluted pulp classification system contains cylindroconical hydroclassifier with the boiled diluted pulp supply, hydroclassifier overhead product desiliconization tank and the bottom product removal from the hydroclassifier cone to the upper arc screen with washing water supply for the top size product mixing. Upper arc screen top size product output is in communication with the mixing device with the red mud output into the thickener, and the top size output is in communication with the lower arc screen with the fine red sludge pulp supply for the lower arc screen top size mixing. Lower arc screen bottom product output is in communication with the mixing device with the red mud output into the washer, and the lower arc screen top size output is in communication with the mixing device with output for the sludge removal. For the products removal from the hydroclassification cone and mixing devices, pumps are used, for example, centrifugal pumps.

EFFECT: technical result is reducing the load on the mixing devices drives, thickeners and washers, possibility of the high-iron bauxite processing.

1 cl, 1 dwg

Description

Technical field

The invention relates to equipment for hydrometallurgical production and is intended to carry out the classification process according to the dispersed composition of the solid phase of various suspensions, for example, aluminum hydroxide suspensions in the production of alumina from various types of alumina-containing raw materials, and can also be used in other industries where solid phase classification is required, contained in the suspension.

State of the art

The main problem in the processing of highly ferrous bauxite in alumina production is the redistribution of thickening and washing of red mud, using flat-bottomed apparatus. Due to the increase in large fractions of sludge in a diluted cooked pulp, the load on the drives of mixing devices increases, which negatively affects both equipment and technological processes, namely an increase in emergency stops and, as a result, a decrease in the frequency of washing of red mud, which entails a loss of alumina and alkali with dump sludge. In this regard, it is necessary to remove a large fraction of the sludge before the redistribution of thickening and washing.

Known hydraulic classifier (patent RU 2113907, B03B 5/62, publ. 06/27/1998), comprising a housing with a cylindrical chamber and a conical bottom located in the lower part of the housing pipe for supplying pulp and pipe for unloading sand, tangential pipes for supplying water, a drain chute and a pipe for air exhaust located coaxially inside the housing with cylindrical rings decreasing from top to bottom, a cylinder installed in the upper part of the housing with a sealed casing above the cylinder and with a cylinder located inside a parabolic reflector, open in its part, facing the pulp supply pipe, in which the pipe supply pipe from the inlet end is equipped with a tube-shaped mixer made in the form of an ejector, the upper part connected to a loading funnel, inside of which a pneumatic-hydraulic aerator is placed in the pipe, the axis of which coincides with the axis of the ejector.

The disadvantage of this device is that the whole process of fractional separation is based on hydroclassification, which requires an additional flow of water to create an upward flow of fine fractions.

The closest in technical essence and the achieved result to the proposed invention is a plant for the enrichment and separation of granular materials (patent RU 86495, B03B 7/00, B03B 5/62, publ. 09/10/2009), containing several classification sections, which contains two vibrating screens with two screening surfaces arranged in two tiers and equipped with a means for supplying washing liquid to the upper screening surface and accumulating hoppers for slurry, gravitational vertical classifier pa, installed between vibrating screens, and the intake device of small sand fractions.

The disadvantage of the installation is the presence in its composition of vibration devices that are more expensive to operate and repair in comparison with static, for example, arc screens.

Disclosure of invention

The technical result of the invention is to reduce the load on the drives of the mixing devices, thickeners and washers, the possibility of processing highly ferrous bauxite.

The technical result is achieved by the fact that the classification system for boiled diluted pulp contains a cylindrical conical hydroclassifier with a supply of boiled diluted pulp, a tank of desalination of the upper product of the hydroclassifier and removal of the lower product from the cone of the hydroclassifier to the upper arc screen with a supply of washing water for mixing the superlattice product, output of the sublattice product of the upper the screen is communicated with a mixing device with a discharge to the thickener of red mud, and the output the bristle product is communicated with the lower arc screen with the supply of pulp of finely divided red sludge for mixing the superlattice product of the lower arc screen, the output of the sublattice product of the lower arc screen is communicated with a mixing device with the discharge to the washer of red sludge, and the output of the superlattice product of the lower arc grinder removal by sludge disposal.

Additional distinguishing features contribute to the achievement of the technical result: pumps, for example, centrifugal pumps, are used to divert products from the hydroclassifier cone and mixing devices.

Brief Description of the Drawings

In FIG. 1 presents a classification system for boiled diluted pulp.

The system includes:

1 - hydroclassifier;

2 - tank desiliconization;

3 - arc screens;

4 - mixing devices;

5 - pumps.

The boiled diluted pulp from the agitator tanks of autoclave batteries (not shown) enters the cylinder-conical hydroclassifier 1.

The upper product of hydroclassifier 1 by gravity enters the tank of desalination 2.

The lower product from the cone of the hydroclassifier 1 by the pump 5, for example, by centrifugal, is sent to the upper arc screen 3.

Sublattice product (slurry pulp without sand) after the upper arc screen 3 by gravity enters the mixing device 4, from where it is sent by pump 5 to the thickener of red mud.

The superlattice product (coarse sand) of the upper arc screen 3 is mixed with washing water and then flows by gravity to the lower arc screen 3.

The superlattice product (coarse sand) of the lower arc screen 3 is mixed with a pulp of finely divided red sludge and flows into a mixing device 4 by a common stream, from where it is sent to the sludge disposal pump 5.

Sublattice product (pulp of washed sludge without sand) after the lower arc screen 3 by gravity enters the mixing device 4, from where it is sent by pump 5 to the red mud washer.

Claims (2)

1. Classification system of boiled diluted pulp, containing a cylindrical conical hydroclassifier with a supply of boiled diluted pulp, a tank of desalination of the upper product of the hydroclassifier and removal of the lower product from the cone of the hydroclassifier to the upper arc screen with a supply of washing water for mixing the sublattice product, output of the sublattice product of the upper arc table a mixing device with a discharge into the thickener of red mud, and the output of the superlattice product is communicated with the lower arc vym crash with a supply of finely divided red mud slurry mixing product nadreshetochnogo lower arc screen, the output product sublattice lower arc screen in communication with a mixing device with a branch in the red mud washer, and lower product output nadreshetochnogo arc screen in communication with a mixing device with a branch to shlamoudalenie. 2. The system according to p. 1, characterized in that for the removal of products from the cone of the hydroclassifier and mixing devices pumps are used, for example, centrifugal.

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