RU1775127C - Magnetogravel thickener - Google Patents

Abstract

FIELD OF THE INVENTION This invention relates to the beneficiation of minerals, mainly finely divided iron ores. The aim of the invention is to provide a highly effective thickener that does not require the use of reagents. Magnetogravel thickener differs from known thickeners in that it establishes a combined diaphragm made of homogeneous slotted magnetic systems filled with ferromagnetic gravel, for example, a lump fraction of crushed magnetite ore, or steel scrap. The proposed gravel thickener provides enrichment of the condensed product in the diamagnetic component, for example, quartz, which makes it possible to obtain fine-grained quartz products that meet the requirements of the building industry (content of at least 60%). as well as a significant increase in the specific productivity of thickening the solid phase. Obtaining material for the construction industry from the waste of iron ore processing plants using the proposed gravel thickener will solve the problem of disposal of fine-grained sludge, which will give a significant economic effect and environmental effect in the economy, 1 silt. (L

Description

The present invention relates to a device for separating into fractions by mineral composition and thickening of various diluted mineral suspensions, the solid phase of which is represented by diamagnetic particles (clay, quartz, coal, etc.), but mainly for fractioning and thickening waste iron ore and coal processing factories.

Various devices are known for separating, thickening, and compacting waste from processing plants, which include a housing, feeding and unloading devices, and a scraper mechanism (rake) for transporting settled mineral particles to discharge.

Magnetic thickeners (filters) are known for finely divided ferromagnetic suspensions, the bodies of which are filled with steel balls surrounded by magnetic excitation coils.

The disadvantages of all known devices for separating into fractions and thickening mineral finely divided suspensions are their effectiveness several times

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division and low specific productivity in the solid phase and the resulting use of flocculant reagents (polyacrylamide), which pollute the circulating water supply and wastewater.

In addition, all known thickeners do not provide separation of the condensed product into fractions by mineral composition, including the prototype.

In order to eliminate these drawbacks, to separate and thicken finely divided mineral suspensions diluted with water, a gravel thickener has been developed, characterized in that a combined diaphragm is installed parallel to the suspension mirror in the thickener below the drain threshold, the central part of which has no holes, and its peripheral part made of unipolar slotted magnetic systems, slotted gaps of which are covered by perforated plates of ferromagnetic material and filled with ferroma netic gravel, e.g., lumpy fraction magietitovoy crushed ore or scrap steel with a very nonuniform particle shape surface. Moreover, the peripheral part of the diaphragm is made of several slotted magnetic systems installed above each other.

The developed gravel thickener is shown in the drawing, where 1 is a power supply device; 2 is a central portion of a diagram without holes; 3 - mirror suspension in the thickener; 4 - ferromagnetic gravel (steel scrap); 5 - permanent magnets of a slit magnetic system, the outer poles of which are unique; 6 - perforated steel plate; 7 - a pipe for removing clarified water; 8 - rake (scraper mechanism); 9 teas; 10 device for releasing the condensed product; 11 - Shelves for mounting slotted magnetic systems.

In the thickener developed by gravitational gravel, a central part of the diaphragm 2, which has no holes, which is made of a steel sheet (mm and is welded by a continuous seam to the tank of the feeding device 1, 300-400 mm below the suspension mirror 3, is installed in the tank 9 by the end of this part of the diaphragm 2 and . metal shelves 11 are welded to the vertical wall of the tank 9, onto which steel plates are vertically mounted, glued on both sides with magnetized barium ferrite plates 5, the outer poles of which are unique. this slotted gaps on the hook x hang perforated

(40-50 mm) steel ferromagnetic plates 6, which are covered with a layer of 100-150 mm of crushed magnetite ore 4. or steel ferromagnetic scrap.

For a deeper clarification of the water displaced from the thickener and sent to the drain pipe 7, slotted magnetic systems filled with ferromagnetic gravel are installed one above the other in

0 several rows

A diluted finely divided mineral suspension with a density of 3-5% solid and a particle size of 30-70 microns through the supply pipe 1 enters the central part of the diaphragm 2, which has no openings, and is located below the level of the suspension mirror 3, i.e. into the volume of the condensed product, where there are no upward flows and, therefore, there is no removal of solid particles into the clarified layer.

At the same time, the thickener tank 9 is kept filled by means of a gate valve 10 with an adjustable outlet, by means of which less material is discharged from the tank 9 than is supplied through the feeding device 1. The upward flow of the liquid phase rushes to the peripheral part of the combined diaphragm. represented by a unipolar slotted magnetic system, the gaps of which are filled with a layer of ferromagnetic gravel 4 with a very inhomogeneous surface, laid on a perforated ferromagnetic steel plate 6, p memory location as well as a particle

5 gravel between the poles with the same polarity 5. Since the magnetic field of the opposite poles in these gaps are directed towards each other, almost the entire surface of the perforated

0 plates and the inner surface of their holes, as well as a very heterogeneous surface of the gravel particles are magnetized. The magnitude of the magnetic field strengths at different points of this system is therefore

5 will be very different and therefore the diamagnetic particles of the suspension approaching such a magnetic system will repel from it and remain under the combined diaphragm, whereas

0 steam-magnetic particles and water will freely pass through the slit gaps of the magnetic system and will be removed from the process by means of pipe 7.

Thus, from what came under

5, the combined diaphragm in the initial feed tank 9 into the drain pipe discharges paramagnetic clay particles, for example, iron field schaat, clarified water is squeezed out, and the concentration of solid particles in the suspension volume under the diaphragm increases significantly, i.e. the starting material is compacted at high speed without the use of reagents.

It has been found that the rate of compaction of a suspension of finely ground quartz waste from iron ore dressing plants, by using the developed magnetogravel thickeners, increases by 4-5 times, compared with the known thickeners. At the same time, the use of reagents is completely eliminated and the cost of operating sludge storages for rich plants is sharply reduced.

Thus, the magnetic gravel thickener enriches the thickened product with a diamagnetic component, for example, quartz, which makes it possible to obtain fine-grained quartz products that meet the requirements of the building industry (the content of SlOa is not less than 60%), as well as a significant increase in the specific productivity of thickening the solid phase. Therefore, obtaining material for the construction industry from iron ore waste

processing plants using the proposed gravel thickener will solve the problem of the disposal of fine-grained sludge in the economy, which will give a significant economic effect.

Claims (1)

SUMMARY OF THE INVENTION A magnetogravel thickener comprising a housing with an annular drain trough, a feed and discharge device, a scraper mechanism, permanent magnets mounted below the drain trough, characterized in that, in order to expand the functionality by separating the feed product into fractions according to the mineral composition, it is equipped with a horizontal partition, the central part of which is solid, and the peripheral part is perforated, and a layer of ferromagnetic gravel placed on the perforated of the partitioned wall, with permanent magnets placed in a layer of ferromagnetic gravel and oriented by the same poles towards this layer.