Extraction method of iron-ore concentrate from aged alluvial tailings of wet magnetic separation of iron ores of skarn-magnetite type

FIELD: mining.

SUBSTANCE: method involves drying of tailing massif, identification of an outline of supergene-converted horizon, separation of thickness of tailings into non-productive lean tailings from upper part of technogenic massives, which are not subject to supergene changes, and productive gothite-magnetite-hematite horizons formed during supergene conversion of technogenic mineral raw material, removal of upper non-productive horizons, extraction of gothite-magnetite-hematite horizon and its processing so that iron-ore concentrate is obtained. Iron-ore concentrate with total iron content of more than 60% is obtained by means of a gravitation-and-magnetic or magnetic method from gothite-magnetite-hematite horizon saturated with iron, which is formed in thickness of aged tailings.

EFFECT: improving efficiency of complex development of iron-ore deposits and processing of wastes of iron-ore production; reducing anthropogenic load onto ecosystems.

2 cl, 2 tbl, 2 ex

 

The invention relates to the beneficiation of minerals and can be used in the mining and metallurgical industry to extract iron from upstream tailings tailings generated in the enrichment process skarn-magnetite ores by the method of wet magnetic separation.

The known method is the extraction of hematite from the tailings wet magnetic separation of iron ores, including wet magnetic beneficiation of iron ore with production of magnetite concentrate and tailings, represented by hematite and martita where the original tails are subjected to the primary hydraulic classification in hydrocyclones with the release of the Sands in the tails, and plums are sent to the secondary hydraulic classification in hydrocyclones emitting drain in the tails. While Sands are sent to the control hydraulic classification in hydrocyclones with the subsequent direction of the discharge into the tailings and sand control and hydraulic classification are sent to flotation getting hematite concentrate and tails (1).

The disadvantage of this method is that it is used for processing the tailings wet magnetic separation of iron ores obtained immediately from the primary processing of iron ore (mainly ferruginous quartzite) and does not affect the involvement of old tailings placed in vodohranilisha.

There is a method of hematite ore beneficiation technological fields, which includes step-by-step process of crushing and magnetic flotation beneficiation process, with preliminary grinding of ore and the subsequent separation of the first and second stages, respectively, after the first and second stages of grinding, flotation, magnetic product of the second stage magnetic separation after the third stage of grinding (2).

The disadvantage of this method is the complexity of the processes of extraction of useful components, the complexity of the preparatory operations, the low efficiency. Also a disadvantage is the application of the method to the entire volume of ore contained in man-made array, without regard to secondary processes, leading to significant changes in the mineral composition of ore stockpiled tailings.

Analogues processing stale upstream tailings wet magnetic separation of iron ore skarn-magnetite type no.

Today, these old alluvial tailings magnetic separation of iron ores is not processed at all. They are industrial waste 3-4 hazard class, have a negative impact on the environment.

The iron content in old alluvial tailings obtained from the processing of iron ore skarn-magnetite type is substantial depends on the ore preparation. Preliminary crushing and pulverisation of the original ore is often accompanied by a change in natural morphology, particle size and Constitution of primary ferrous minerals until the appearance of newly formed phases, effects of amorphization, polymorphically, pseudomorphinae minerals, which significantly affects the efficiency of the separation of productive resources (3).

A new study (4) found that when fine grinding increases the defect structures of magnetite appears newly formed maghemite, increasing the heterogeneity of the oxidation of magnetite in maghemite, and then extracted. Especially intensive processes occur in deformed areas. It is established that the integrity of ferrous minerals significantly reduce the magnetic susceptibility and reduce the output of the magnetic concentrate. Accordingly increases the amount of ore passes in the tailings.

In 2010-2012, it was found that man-made deposits of alluvial tailings wet magnetic separation of iron ore skarn-magnetite type are not stable array, and are actively changing heterogeneous system (5). Under the influence of secondary processes in the context of upstream anthropogenic strata tailings forming two horizon.

Material composition of the upper horizon of the gene is automatically associated with magnetite-Martinovi type tails, coming together with the pulp in the tailings pond. In the lower horizon under intense impact of anthropogenic aquifer is the conversion of mineral mass tails, commonly develops replacement of magnetite by hematite, goethite and gidrogenit preserving forms of primary emissions. The most intensive processes of substitution occur at the base of the man-made solid tailings. Typically, the magnetite can be traced mesh and lattice structure collapse. Along directions octahedral separately formed hematite. The facets of one grain of magnetite can be modified in various degrees. With increasing depth there is the development of more complex secondary structures appear metacolloids (golomorfnogo) crypto-crystalline aggregates. The bulk containing ore minerals are, for the most part is an amorphous clay-ferruginous composition. In the result of the transformation of matter in stale tails is a new goethite-magnetite-hematite ore types with high iron content, a practice which can be gravity-magnetic or magnetic methods of obtaining saleable concentrate more than 60%.

Thus, in old alluvial tailings wet magnetic separation of iron ore skarn-intitulado type over time, a new type of mineral raw materials, suitable for industrial development, and it becomes possible recycling of manufacturing waste.

The invention solves the problem of disposal of process waste production and recycling of old alluvial tailings wet magnetic separation of iron ore skarn-magnetite type for the extraction of iron ore concentrate from iron-fortified goethite-magnetite-hematite horizon, formed in the thickness of technogenic deposits.

The technical result consists in disposing of waste production through recycling of old alluvial tailings wet magnetic separation of iron ore skarn-magnetite type with the receipt of iron ore concentrate from the goethite-magnetite-hematite horizon, formed in the thickness of the old tailings, reducing the environmental impact in the areas of industrial waste data.

This technical result is achieved in that the method of extraction of iron ore concentrate from old alluvial tailings wet magnetic separation of iron ore skarn-magnetite type, includes draining array tails, establishing a circuit supergene-transformed horizon (goethite-magnetite-hematite-type), separation column tails on unproductive poor, not affected by supergene changes in the tails of the top technology in the gene arrays and productive goethite-magnetite-hematite horizons, rich in iron, formed in the supergene process of converting mineral waste, the removal of the upper productive horizons, removing the goethite-magnetite-hematite horizon and its processing with the receipt of iron ore concentrate.

Removing the goethite-magnetite-hematite horizon from an array tails carried out by extraction of productive horizons. Receipt of iron ore concentrate from these horizons perform gravity-magnetic or magnetic method.

The method of extraction of iron from goethite-magnetite-hematite horizon stale upstream tailings is to carry out the following operations.

Draining old alluvial tailings wet magnetic separation of iron ore skarn-magnetite type of technogenic deposits. Drainage of the array produced by the pumping of free water through the sump. The number of dewatering structures can be one or several, depending on the volume of the drying sections.

The separation of old alluvial tailings on productive and non-productive horizons. The setting in array of old alluvial tailings formed in the process of storing the goethite-magnetite-hematite horizon. Determine whether the amount of iron content.

Development of goethite-magnetite-hematite horizon. Man-made reservoir is divided into the first is full-time blocks. Using earthmoving equipment top unproductive horizon technogenic sediments removed and stored in a pile on the free sections of the tailings, and goethite-magnetite-hematite horizon is retrieved to the surface. The extraction is carried out using a loading and unloading equipment.

The productive horizon is mined by dredges or direct the course of the excavator layers from the top down loading them into a vehicle and transported to the beneficiation plant. The vacated space in the blocks is filled with previously removed tails with poor content.

Extraction of iron ore concentrate with a content of total iron more than 60% of the goethite-magnetite-hematite horizon to produce enrichment plant gravitational-magnetic or magnetic method.

Formed during storage in upstream stale tails of wet magnetic separation of iron ore skarn-magnetite type a new kind of mineral raw materials goethite-magnetite-hematite type with a high iron content allows you to produce iron ore concentrate with iron content of over 60%.

Example 1

As a test selected TMF JSC "Krasnokamensk mine, located in Kuragino the district of Krasnoyarsk region. Conducted the dehumidification unit TMF SPO is obom pumping water through the sump. Geological studies have shown that the power of the old tailings on the tested unit was 31 PM

The upper part of technogenic deposits in the interval from 0.0 to 10.0 m is characterized by the average total iron content of 17%. The mineral composition is represented by quartz 45%, hematite and magnetite 15%, albite 15%. The share of other minerals is 25%. According to the mineral composition of the ore mass refers to the goethite-magnetite-hematite type. Horizon refers to unproductive type.

The lower part of technogenic deposits in the range of from 10.0 m to 30.0 m is characterized by the average total iron content of from 29 to 35%. The thickness of the horizon is represented by siliceous-hypersalinity type formed by quartz 30%, magnetite 8%, hematite 12%, goethite 13.5 per cent, the share of other minerals is 12%. Ore mineralization has goethite-magnetite-hematite structure. There is a General replacement of magnetite by hematite, goethite and gidrogenit preserve the shape of the primary grains. The magnetite can be traced mesh and lattice structure collapse. With increasing depth of tailings in the tailings pond observed the development of more complex secondary structures associated with the formation of metacolloids (golomorfnogo) crypto-crystalline aggregates. The bulk containing ore minerals are, for the most part represents the isomorphous clay-glandular mass, in which microengineering analysis of the iron content is set to 26,66%, aluminum up of 46.06%. Hematite in the lower horizon tails is mainly the product of changes in magnetite (martitization), a mineral found in intergrowths with the latter. Marked partial and complete pseudomorphs of hematite to magnetite, as a rule, remains octahedral and cubic grains form. Resource potential in the lower productive horizon is estimated at 20000000 tons goethite-magnetite-hematite ore with a total iron content of from 29 to 35%.

Man-made reservoir was divided into blocks of size 10 x 10 m

Using earthmoving equipment top unproductive horizon was removed and stored in the collar.

Extraction of iron ore concentrate was carried out from productive supergene-preobrazovannogo horizon goethite-magnetite-hematite type in the interval from 10 to 30 m

Tests are performed on a bulk sample weighing 350 kg, selected from around the productive horizon.

Removing iron from the goethite-magnetite-hematite horizon conducted on gravity-magnetic circuit including ore pretreatment operation, coil separation and final gravity concentrate magnetic separation. Preliminary preparation of raw materials included: the disintegration and is classificatio material, followed by desliming material size -0,5+0 mm hydrocyclone.

Experimental tests of gravitational enrichment carried out on the spiral separator HG10S (Australia) on mycom poor product particle size of 0.5 mm and abaissement on the hydrocyclone rich product size and 0.5 mm In the result of the gravitational separation of man-made material received total concentrate containing 60,09% Fetotalextraction 47,62%. The output value is 20,96%. Improving the quality of the obtained product was carried out by finishing gravity concentrates size +0.5 mm and-0.5 mm for wet drum separator-analyzer SBA-0,6 M Studies were carried out at values of the magnetic field of 0.05 T and 0.1 T Of 0.25 Tesla.

Summary indicators of enrichment for the gravitational-magnetic circuit are shown in table 1.

Table 1
Summary indicators of enrichment for the gravitational-magnetic circuit
Name of productOutput %Fetotal
Content, %Extract, %
Concentrate gravity-magnetic separation 22,8961,0854,0
Σ Middlings (non-magnetic fraction)11,431,213,7
Σ Final tailings screw separation44,458,9616,0
Galya (waste product)3,7628,1a 3.9
Drain g/Cof 17.519,212,4
The original ore100,026,0100,0

Example 2

Analogously to example 1. The allocation of iron ore concentrate from the goethite-magnetite-hematite horizon was carried out using the magnetic circuit.

Enrichment was carried out on mycom poor product particle size of 0.5 mm and abaissement on the hydrocyclone rich product size-0.5 mm using a separator SBA-0.6 M at values of the magnetic field of 0.05 T and 0.1 T, followed by enrichment on a rotary electromagnetic separator with high-intensity magnetic field. With parace was performed at a magnetic field of 1 T, and then pricesales at H=0.5 T. Aggregates of magnetic enrichment are shown in table 2. The results of magnetic separation of man-made material received total concentrate containing 62,4% Fetotalextraction 45,54%. The output value of KZT 19.09%.

Summary indicators of enrichment on the magnetic circuit are shown in table 2.

Table 2
Summary indicators of enrichment on the magnetic circuit
Name of productOutput %Fetotal
Content, %Extract, %
Σ ConcentrateKZT 19.0962,445,54
Σ Middlings18,6934,8925,78
Σ Tails40,967,8712,38
Galya (waste product)3,7628,1 3,90
Drain g/Cof 17.519,212,4
The original ore100,026,07100,0

According to the results of x-ray phase analysis of the mineral composition of iron ore concentrate, extracted from the goethite-magnetite-hematite horizon, consists mainly of quartz, magnetite, hematite. The proportion of magnetite reaches 50%, hematite 30%, quartz 5%, goethite 2%. The share of other minerals is 13%.

The proposed method for processing of old alluvial tailings allows you to recycle iron ore production, to get additional iron ore concentrate with a content of total iron more than 60% of iron-fortified goethite-magnetite-hematite horizon, formed in the thickness of the old tailings, to reduce anthropogenic pressure on ecosystems, to improve the efficiency of the integrated development of iron ore deposits.

Sources of information

1. EN 2427430 A1, IPC WV 7/00, VS 1/00, publ. 08.04.2010.

2. EN 2383392, IPC WV 7/00, VS 1/00, publ. 2006.01.

3. B. I. Pirogov Technological Mineralogy of iron ore/ Bierhof, Gaspergou, Iphonesim, Vintersol. - L.: Nauka, 1988. -304 C.

4. Problems of directional changes t geologicheskikh and technical properties of minerals. - L.: Mekhanobr, 1985. - 136 C.

5. Celuk DI prospects of development of industrial waste iron ore production in Eastern Siberia / Dealloc, Intelec // proceedings of the Siberian branch of the Section of Earth Sciences natural Sciences. - 2012. No. 2 (41), p.142-150.

1. The method of extraction of iron ore concentrate from old alluvial tailings wet magnetic separation of iron ore skarn-magnetite type, including drainage of the array tails, establishing a circuit supergene-transformed horizon, the separation column tails on unproductive poor, not affected by supergene changes in the tails of the upper part of technogenic massifs and productive goethite-magnetite-hematite horizons formed in the supergene process of converting mineral waste, the removal of the upper productive horizons, removing the goethite-magnetite-hematite horizon and its processing with the receipt of iron ore concentrate.

2. The method according to claim 1, characterized in that the extraction of iron ore concentrate perform gravity-magnetic or magnetically.



 

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1 dwg

FIELD: Utilization of wastes containing mercury.

SUBSTANCE: the invention is dealt with utilization of wastes containing mercury, in particular, with the device for extraction of luminophore from fluorescent lamps and may be used in an industry where it is necessary to separate dust-like substances from subjects. The installation includes a container performing a function of a crusher with the support structure, made in the form of a rectangular parallelepiped and mounted with a capability of rotation around of its longitudinal axis inclined at an angle of 45°. In the upper plane of the container there is a window for loading lamps. The support structure of the container includes timbered a fixed sheet abutting without a spacing to the upper plane of the container made with an aperture above which a loading cylinder is fastened. The container is divided into three sections by transversal lattices, and on a lateral wall of the container in its upper and middle sections at a level of lattices there are opening hatches for unloading the lamps pedestals and glass breakage. At that in the middle section there are jets installed for feeding compressed air as the counter-current streams, and the lower section is connected to the system of evacuation of luminophore into the storage. The technical result is reduction of expenditures on realization of the process of utilization and on production of the installation, and also provision of the best protection of the atmosphere and employees from mercury pollutions.

EFFECT: the invention ensures reduced expenditures on realization of the process of utilization, on production of the installation, and the best protection of the atmosphere and employees from mercury pollutions.

1 dwg

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