RU2392057C9 - Magnetic hydroseparator - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to mineral dressing and can be used in iron ore dressing. Magnetic hydroseparator for iron ore dressing includes vertical case with feeder and top drain, circular magnetic system mounted below drain level, discharge cone with flushing device. Circular magnetic system of hydroseparator includes device for drainage material sediment removal from the system surface. Device for drainage material sediment removal includes at least one set of elastic membranes mounted on the internal surface of circular magnetic system. Elastic membranes are mounted so as to allow for compressed air feed into the space between membrane and circular magnetic system.

EFFECT: enhanced efficiency of dressing, improved concentrate quality, reduced energy consumption.

3 dwg

Description

The invention relates to the beneficiation of minerals and can be used in the beneficiation of iron ore.

Known magnetic hydroseparator (patent No. 2185247, 10/18/2001, B03C 1/10), which includes a vertically oriented housing with an upper drain, with a circular magnetic system installed below the drain threshold, the hydroseparator has a discharge cone with a flushing device, the hydroseparator also has the upper part of the feeding device and the driving scraper device with the ability to interact with the inner surface of the circular magnetic system.

Also known is a magnetic deslamator (patent No. 2001684, 24.02.92, B03C 1/10), which, in addition to similar features of the above analogue, is equipped with a device for changing and fixing the gap between the control (circular) magnetic system and cleaners (scrapers).

The difference between the two analogues also lies in the fact that in one (patent No. 2001684) the cleaners (scrapers) are mounted on the drive shaft with rakes, and the other (patent No. 2185247) has an independent scraper device that is not connected with rakes. This difference is significant from the point of view of the intensity of interaction with the circular magnetic system of cleaners of magnetic deslamers and scraper devices of magnetic hydroseparators.

Also known is a magnetic hydroseparator (US patent No. 7022224, B2).

The common disadvantages of analogues are the fact that to separate from the inner surface of the circular magnetic system the sediment of the drain material to their scrapers or cleaners requires contact or interaction with this inner surface. In addition, scrapers or cleaners have a scraper that requires periodic replacement or a part that replaces it due to wear. If the scraper mechanism is subjected to wear during interaction with the circular magnetic system, then the magnetic system itself is also subject to wear.

The purpose of the invention or the technical result achieved is to increase the enrichment efficiency, simplify the design of the magnetic hydroseparator while increasing its service life. The result is achieved due to the fact that the magnetic hydroseparator containing a vertically oriented housing with a feeding device and an upper drain, with a circular magnetic system installed below the level of the drain threshold, and having a discharge cone with a flushing device, and its circular magnetic system has a device for removing according to the invention, this device consists of at least one set of elastic membranes fixed to the inner surface of a circular ma netic system, wherein the elastic members are arranged to feed into the space between the membrane and the circular magnetic compressed air system.

Figure 1 shows a magnetic hydroseparator (MGS), which contains a housing (1), a discharge cone (2) with a flushing device (3) and an adjustable discharge device (4), a circular magnetic system (5) with a device (6) for removal from its surface, the sediment of the drain material and this device consists of a set of elastic membranes mounted on the inner surface of the circular magnetic system, while the elastic membranes are installed with the possibility of supplying compressed air into the space between the membrane and the magnetic circular system.

Magnetic hydroseparator (MGS) of the present invention operates as follows. Food in the form of concentrate pulp enters the IGU from above into the zone of the most effective effect on the concentrate pulp of the washing liquid and the smallest loss of iron with discharge. In this zone, under the influence of gravitational forces, density stratification and deposition of the useful component (magnetic fraction) occur. Concentrate pulp is a ferrosuspension consisting of grains of various sizes, mainly magnetite, silica and their rich and poor intergrowths. In the zone of operation of the washing device 3, which is configured to control the supply of washing liquid, gas, or a mixture thereof, silica grains, magnetite-poor aggregates and upward flow, for example, air bubbles, rise up into the discharge zone from the ferro-suspension. Fine particles of magnetite, as well as coarser fractions of it, will inevitably be carried into the discharge zone by an upward flow. They, as well as magnetite-rich splices, are captured by the circular magnetic system 5 installed inside the upper part of the housing 1 below the drain threshold, are classified, separated, forming a precipitate from the drain material, and are periodically removed from the magnetic system using the device 6. The precipitate from the discharge material is actually formed not on the circular magnetic system itself, but on the elastic membrane fixed to it. This sediment consists of sludge particles trapped among magnetite grains, as well as magnetite particles and various intergrowths. After compressed air is supplied under the membrane, this conglomerate breaks away from the membrane, while magnetite particles with rich aggregates under the influence of gravitational and magnetic forces drop lower and settle on the membrane that has returned to its original position, and the poor aggregates, together with the particles of sludge, are carried upstream into the drain (figure 2). The air under the membrane is supplied periodically and after each air supply shaking and cleaning of the sediment takes place. The grains of the useful component, moving downward, accumulate under the magnetic system, flocculate and, under the influence of gravitational forces, lower to the unloading side, where they, together with the useful component deposited by gravity, are removed through an adjustable unloading device 4.

After the cessation of air supply under the membrane, it is returned to its previous position due to its elastic properties, as well as due to metal plates mounted in the membrane body. Metal plates are attracted to the magnetic system and thereby contribute to the release of air from the space between the membrane and the magnetic system and contribute to the tight fit of the membrane to the magnetic system. This is a KNOW-HOW invention.

Increasing and decreasing the amplitude of the membrane due to changes in the pressure of the air supplied under the membrane, as well as the ability to change the cyclicality of the air supply, allows more efficient control of the magnetic hydroseparator in combination with a controlled flushing device and an adjustable unloading device, and thus increases the efficiency of enrichment.

When iron ore slurries are enriched with different granular composition and mineralogy, it is possible to use magnetic desilators and magnetic hydroseparators (MGS) with circular magnetic systems with different strengths. At such MGSs, it is possible to interact with circular magnetic systems equipped with membranes with driven scraper devices of the same deslaminators and magnetic hydroseparators. While scraper devices can be equipped with a device for changing and fixing the gap between the magnetic system and the scraper (figure 3).

With a fixed position of the scraper or cleaner relative to the circular magnetic system with membranes fixed to it, friction of the scrapers against the inner surface of the circular magnetic system is excluded. At the same time, the efficiency of the return of fine magnetite from the discharge zone back to the process significantly increases.

The application of the invention at different stages of separation, classification and deslamation allows to make the enrichment technology manageable, to obtain a concentrate with desired characteristics, as well as to automate and computerize the enrichment process.

By increasing the quality of the concentrate and reducing energy costs, you can get an economic effect in the tens of millions of US dollars.

Based on the foregoing, we can conclude that the proposed invention is useful, new, has an inventive step, increases the concentration efficiency and can be used in the processing of iron ores.

Claims (1)

Magnetic hydroseparator for the enrichment of iron ore, consisting of pulp of iron ore and rock mixed with at least one liquid, the hydroseparator consists of a vertically oriented housing with a feed device and an overflow, with a circular magnetic system installed below the level of the drain threshold, a hydroseparator has a discharge cone with a flushing device, and a circular magnetic separator system has a device for removing sediment from the surface of the drain material, characterized in that the device for The removal of sediment of the drain material consists of at least one set of elastic membranes fixed to the inner surface of the circular magnetic system, while the elastic membranes are installed with the possibility of supplying compressed air into the space between the membrane and the magnetic circular system.

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