Method of obtaining of bulk concentrate from ferruginous quartzites

FIELD: mining.

SUBSTANCE: invention relates to mineral dressing and can be used in mining and iron and steel industry. The method of obtaining of bulk concentrate from ferruginous quartzites comprises the grinding of the source ore, its hydraulic classification with obtaining of overflow and sand products, stadial magnetic separation and gravity dressing of tailings of magnetic separation. Magnetic fraction of the base magnetic separation is subjected to thin classification. Oversize fraction of classification is sent for regrinding and cleaning magnetic separation with returning of the magnetic product for classification. Undersize fraction of the product is subjected to additional dressing with separation of magnetic and nonmagnetic fractions. The magnetic fraction is subjected to magnetic and gravitational separation with separation of magnetite concentrate. Nonmagnetic fraction is aggregated with tailings of the previous stages and sent to screw and hydraulic separation with obtaining of hematite concentrate and dump tailings. The tailings of magnetic and gravitational separation are subjected to desliming with separation of draining in tailings, and sands are returned for regrinding. Heavy fraction of the base stage of screw separation is sent for cleaning screw-shaped separation to dump a lighter fraction to tailings and obtaining of rough hematite concentrate, the operational development which is finished out by hydraulic separation.

EFFECT: increase of separation of ferriferous minerals.

3 cl, 1 dwg

 

The invention relates to the beneficiation of minerals and can be used in mining and metallurgical industry.

To date, most of the fields of the rich and free-milling ore iron ore has been worked out, which causes the necessity to involve in the processing of complex ores of the material composition. This circumstance requires the creation of new technologies that provide high technical and economic efficiency of obtaining iron ore concentrates.

There is a method of enrichment of magnetite ore, including her grinding with subsequent gravity separation of material on the hard sand and easy drain products, then light the discharge product is subjected to magnetic separation to obtain magnetic and non-magnetic products, with non-magnetic product is removed from the process and dump in a dump, and magnetic product is sent to the food mill. Heavy sand product is subjected to regrinding and subsequent magnetic separation to obtain magnetic and non-magnetic products, with non-magnetic product is removed from the process and dump in the dump (RF Patent No. 2307710, CL VV 7/00, publ. 10.10.2007,).

The disadvantage of this method is that it does not provide for the allocation of collective concentrate in the case of enrichment of mixed magnetite-hematite-artimovich ores, because of the heavy fraction is subjected to gravity separation magnetic separation with obtaining magnetic product and nonmagnetic fractions sent to the dump along with the weakly magnetic minerals (hematite, goethite).

The method for extracting hematite from the tailings of magnetic separation of iron ore complex material composition, including wet magnetic beneficiation of ore with production of magnetite concentrate and tailings, which are subjected to hydraulic classification emitting Sands in the tails, and plums are sent to the secondary hydraulic classification in hydrocyclones emitting drain in the tails. Sands are sent to the control hydraulic classification in hydrocyclones with the subsequent direction of the drain in the tails. Sand control and hydraulic classification are sent to flotation getting hematite concentrate (RF Patent No. 2427430, CL VV 7/00, VS 1/00, publ. 27.08.2011,).

The disadvantage of this method of enrichment tailings of magnetic separation of iron ore complex material composition is the low effectiveness of the process and the receipt of hematite concentrate with low mass fractions of total iron, which is not more than 52.2 per cent due to low efficiency of site preparation tails wet magnetic separation hydrocycloning.

Of the local way of dressing of iron ores, includes grinding the original material, its classification on the fine and coarse fraction, grinding the coarse fraction, desliming and magnetic separation of fine fraction with obtaining the concentrate and tailings, and chopped large fraction after desliming combine with the crushed raw material and sent for classification (Patent RF №2028832, CL VS 1/00, publ. 20.02.1995).

The disadvantage of this method is the low efficiency of the enrichment process due to loss of mass fraction of iron with weakly magnetic minerals-hematite and martite sent to the tails of wet magnetic separation.

The technical essence and the achieved result closest to the claimed is a method for collective concentrate of ferruginous quartzite, carried out on the magneto-gravitational technology in the crushing and concentration plant, OAO Olkon, including a two-stage ore grinding, hydraulic classification and subsequent separate operations magnetic enrichment Sands and drain, magnetic in several stages of separation of fine-grained fractions of the material and gravitational enrichment tailings main magnetic separation by jigging machines (Reference enrichment of ores. Concentrator, Moscow, Nedra, 1984, S. 195).

The main deficiencies is am known way for collective magnetite-hematite concentrate include: a large part of the energy method, related pereizlucheniem disclosed large grains of ore minerals and multi-stage beneficiation, magnetic separator, the existence of a significant (up to 300%) of the circulating load to the primary grinding process produce large fractions of the crude concentrate, low efficiency processes hydraulic classification in hydrocyclones and gravity separation, due to the correspondingly high content of fine classes in Peskova product sent for regrinding, and high loss of fine fractions of hematite with tails jigging.

The technical result of the invention is to improve the extraction of iron-containing minerals by increasing the effectiveness of training schemes ferruginous quartzite enrichment for later more commercial products in the form of magnetite and hematite iron concentrates conforming content.

This is achieved by the fact that the method of obtaining collective concentrate of ferruginous quartzite, including grinding the original ore, hydraulic classification of the crushed product emitting plum and sand, multi-stage magnetic separation and gravity concentration magnetic separation tailings, characterized in that the magnetic fraction of the main magnetic separation expose that is why classification, while the oversize of the classification guide for regrinding and prechistoy magnetic separation with magnetic return the product for classification and underflow dobogomajor emitting magnetic and nonmagnetic fractions, and the magnetic fraction is subjected to magnetic-gravitational separation with separation of magnetite concentrate and non-magnetic fraction was combined with the tails of the previous stages and allow for the separation of the screw and hydraulic separation to obtain hematite concentrate and tailings, and tailings magnetic-gravitational separation is subjected declaiming emitting drain in the tails, and the Sands return to the operation cosmelenia, in addition, heavy fraction main stage helical separation goes on prechistoy screw separation emitting light fraction in the tails and producing crude hematite concentrate finishing is carried out by hydraulic separation.

New in fashion with respect to the prototype is that the magnetic fraction of the main magnetic separation is subjected to fine classification, while the oversize of the classification guide for regrinding and prechistoy magnetic separation with magnetic return product classification, and underflow is subjected to additional enrichment with vyd the population of the magnetic and nonmagnetic fractions, moreover, the magnetic fraction is subjected to magnetic-gravitational separation with separation of magnetite concentrate and non-magnetic fraction was combined with the tails of the previous stages and allow for the separation of the screw and hydraulic separation to obtain hematite concentrate and tailings, and tailings magnetic-gravitational separation is subjected declaiming emitting drain in the tails, and the Sands return to the operation cosmelenia, in addition, the heavy fraction of the primary phase coil separation is directed to prechistoy screw separation emitting light fraction in the tails and producing crude hematite concentrate finishing is carried out by hydraulic separation.

The mentioned set of features in the technical patent literature is not detected. Therefore, the invention meets the criterion of "inventive step".

The invention is a method of obtaining a collective concentrate of ferruginous quartzite is illustrated in the diagram.

The method of obtaining collective concentrate of ferruginous quartzite is as follows.

Ferruginous quartzite containing mineral particles of magnetite and hematite ground in a rod mill operating in open circuit with a spiral classifier with obtaining large fractions of sand models of fractions plum.

Sand classifier arrive at the second stage of grinding in a ball mill. Discharge ball mill, together with the drain of the classifier, is served at the I stage of magnetic separation, where it is divided into two process flow: magnetic and gravity separation.

Typically, each stage of wet magnetic separation increases not only the mass fraction of total iron in phasic rough concentrate, but in the multi-stage technological tails.

During stadial disintegration of ferruginous quartzite in grinding mills provide a process for the disclosure of mineral grains by separating the ore from non-metallic minerals and ore minerals with high magnetic properties of magnetite ore from minerals with weak magnetic properties of hematite. Due to this, provide a phasic increase in the number of free ore grains in the prepared for the further enrichment of the material.

Since magnetite has a high residual magnetization and demagnetization and dilution of the pulp does not have a significant impact on the separation of clusters, obtaining high-quality concentrate in stage I primary magnetic separation is possible only with full disclosure of clusters in the final stages of grinding.

Draft main concentrate is agnitas separation in the form of iron ore slurry with a high density is subjected to mechanical classification and divided according to the size of the vibration of high frequency sound emitting thin fractions of iron minerals in the underflow. As a result of mechanical vibration rough concentrate magnetic separation reported high frequency pulses at a high level of acceleration vibration oscillations. While iron ore minerals, with high bulk density due to the segregation process, go to the source of vibration - screening surface. Large mineral particles, mainly intergrowths of iron and non-metallic minerals with lower bulk density, concentrated in the upper layers of the flow of slurry moving on the main surfaces of the crash. Small particles located on the surface with high total iron mass fraction and bulk density, penetrate through the openings of the screening surface in the underflow. Large mineral particles with low mass fractions of total iron and bulk density due to the large angle of inclination of the screening surface fall into the oversize product. Vibration classification of rough concentrate magnetic separation increases the content of total iron in undersize product screen and allows you to select the oversize of the low mass fractions of total iron.

Powered vibrating screen is also magnetic product stage II magnetic separation, n is provided in the form of circulating load after grinding in a ball mill.

Fine fraction undersize product, open presents grains of magnetite, hematite and rock-forming minerals are further magnetic separation of the last stage, which allows to significantly increase the content of total iron in the allocated magnetite concentrate. For further refinement of the concentrate to the required content on the total gland it is directed to magnetic-gravitational separation. The application of this highly selective method is due to the fact that magnetite product obtained in the last stage of magnetic separation, consists mainly of open grains of magnetite and minor amounts of intergrowths of magnetite with rock-forming minerals with similar physical properties. The principle of magnetic gravity separation is based on the effects on mineral suspension containing selfnominate fine particles, a uniform magnetic field of low intensity (from 4 to 16 kA/m) and twisted upward water flow (vertical component of velocity in range (0,8-2,0)·10-2m/s), resulting in the formation of fluidized ferromagnetic layer, which is highly efficient separation medium, filtration parameters which depend on the ratio of magnetic and hydrodynamic forces. Selfnominate the astitsy and rich clusters under the action of magnetic fields are involved in the aggregation process, forming a vertically elongated aggregates, which have low resistance to movement, are concentrated in the lower part of the upward stream and removed from the separation process in the form of a magnetic fraction or magnetite concentrate. Non-magnetic particles and aggregates of magnetite with rock-forming minerals are not involved in the aggregation and move in mazarakata pore channels under the action of the upward water flow in the upper part of the separation volume and displayed in the form of a non-magnetic fractions or plum. Unlike conventional magnetic separation magnetic gravity separation allows you to control the mode of aggregation of the magnetic particles by selecting the appropriate ratio of the values of magnetic field strength and speed of the rising water flow, ensuring separation of magnetite particles from clusters with the required content sinnemahoning mineral. This feature of the separation process allows to obtain a final magnetite product in the form of iron ore concentrate of constant quality. Plums magnetic gravity separation is a product with low solids content (in the range of 0.5-1.5%) and mainly contains intergrowths of magnetite with rock-forming minerals, requiring cosmelenia for disclosure of magnetite and its subsequent retrieval. Because the contents of the solid in food operations cosmelenia should be 50-70%, the plum magnetic-gravitational separation is subjected declaiming, providing condensed product of the desired density and tailings. In operation declaiming possible the use of magnetic declamation to more effectively capture the magnetite particles of micron size, are always present in the magnetite-containing products due to the high fragility of this mineral.

A large fraction of the oversize of the screen is subjected to grinding in a next stage ball grinding together with the circulating load in the form of sand magnetic declamatory selected in the process of separating the drain from the processing of magnetite product stage III enrichment by tuning the magnetic gravity separation using a magnetic field of low intensity.

Desliming plum magnetic-gravitational separator was produced using magnetic declamatory, Sands which, in the form of a circulating load, did later on regrinding ball mill.

A combination MG-separation and fine screening has allowed us to implement the principle of multi-stage output of the finished concentrate on the main stages of the technological process due to the high efficiency of these operations in the division of scolastici avannah products what is the underflow of thunder.

Obtained in the process of ferruginous quartzite non-magnetic products at all stages of magnetic separation, and plums declaiming are combined and sent in loop gravity separation to extract hematite. Originally a joint product of the share in the main stage helical separation, and the heavy fraction is sent to prechistoy screw separation emitting light fraction in the tails and producing crude hematite concentrate further finishing is performed using a fluidized bed in the hydraulic separator with inclined plates.

The separation of mineral particles in spiral separators produced by the existing difference of density between the particles of hematite and rock-forming minerals (quartz, feldspars, amphiboles, and so on)that provides the tailings in each of the stages of the spiral separation.

The main coil separation ensures the excretion of further enrichment tailings with a minimum content of hematite and precista operation increases almost 25% of the content of the mass fraction of iron in the rough hematite concentrate, re-enrichment which was carried out in the hydraulic separator, consisting of separate sections fitted with nymi them inclined plate. The enrichment of fine-grained material under the action of the upward flow of water is in contrast to the known constructions of industrial separators are not in the volume of pulp on the principle of ranoadidas or hydraulic classification, and inside pseudovirions segregation layer on the principle of separation, due to the location therein of the package parallel relative to each other of the plates.

As a result of implementation of the method of obtaining collective concentrate of ferruginous quartzite losses are reduced ore minerals enrichment technology increases the mass fraction of iron in the concentrate and reduces the loss of iron in the dump tails.

An example of performing the method.

The drawing shows a diagram and key process indicators to collective concentrate of ferruginous quartzite Zimenkovsky group of fields.

Source ferruginous quartzite, with a mass fraction of iron total of 27.5% is subjected to grinding in a rod mill, providing partial disclosure of minerals and the production of a material particle size -2+0 mm Unloading the mill is directed to hydraulic classification in the spiral classifier with obtaining gravel and drain products. Sand the product after it cosmelenia in open circuit ball mill and associations with drain product serves in the first stage m is cut magnetic separation, where the separation of free grains of magnetite from rock-forming minerals and is output from the enrichment process nonmagnetic fractions to mass fractions of iron total of 12.3%. The magnetic fraction of the I stage of magnetic separation with the content of Fetotal. 31,9% is subjected to separation into a screening area, high frequency vibrating screen. In the mechanical classification screening polyurethane surface with a cell size of 0.125 mm allocate large classes of oversize product and fine fraction undersize. Obtaining major factions draft magnetite concentrate on the screening surface of the screen is carried out in the mode of segregation separation of particles by volume weight and a particle size up to 45.2% of the mass fraction of iron in undersize product and reduce its content to 29.9% in oversize.

Power of thunder is also magnetic product of the second stage magnetic separation, containing about 40% of the total iron and received in the form of a circulating load after cosmelenia and disclosure of splices in a ball mill.

Undersize product after receiving it fine screening undergoes further magnetic separation of the last stage, which allows to increase the total iron content of more than 16% from 45.2 per cent to 61.4 per cent in the extract is about to 75.7% of the original ore.

A large fraction of the oversize of the high-frequency vibration rumble gospelchor in the mill last stage ball grinding together with the circulating load in the form of sand magnetic declamatory selected in the processing of non-magnetic grades magnetic gravity separation.

Subsequent finishing roughing magnetite concentrate III stage magnetic separation was carried out by his direction to the magnetic-gravitational separation, providing conforming magnetite concentrate containing above 66% Fetotal.

The tails of wet magnetic separation of the various stages of magnetic separation of ferruginous quartzite containing hematite, direct on the main stage helical separation producing crude hematite concentrate and tailings. Rough hematite concentrate with mass fraction of total iron above 34% are re-enrichment in the second stage screw separation, allowing the selection of the product with a content of about 59% Fetotal.

The cleaners product stage II coil separation was done by his direction in the hydraulic separator, consisting of sections with sloping placed in them parallel plates. The heavy fraction of the hydraulic separator is a finite hematite concentration is at, containing 65% total iron when removing 15% of the original ore. Mass fraction of iron in the total tails is 4.9%, the loss of which reached 11.2% of Fetotal.

Hematite concentrate gravity separation was United with magnetite concentrate magnetic separation, resulting in a total bulk concentrate containing up to 66.5% Fetotal. when removing 88,7%.

The implementation of the method of obtaining collective concentrate of ferruginous quartzite on the example of the group of fields Zamandash district can improve the efficiency of a process of wet magnetic separation by increasing the technological uptake of magnetite concentrate and gravity processing total tailings magnetic enrichment by additional extraction of hematite.

1. The method of obtaining collective concentrate of ferruginous quartzite, including grinding the original ore, its hydraulic classification with getting the drain and gravel products, multi-stage magnetic separation and gravity concentration magnetic separation tailings, characterized in that the magnetic fraction of the main magnetic separation is subjected to fine classification, while the oversize of the classification guide for regrinding and prechistoy magnetic separation to return the atom magnetic product on the classification, and underflow is subjected to additional enrichment with separation of magnetic and nonmagnetic fractions, and the magnetic fraction is subjected to magnetic-gravitational separation with separation of magnetite concentrate and non-magnetic fraction was combined with the tails of the previous stages and allow for the separation of the screw and hydraulic separation to obtain hematite concentrate and tailings.

2. The method of obtaining collective concentrate of ferruginous quartzite under item 1, characterized in that the tails of the magnetic-gravitational separation is subjected declaiming emitting plumin the tails,and the Sands return to the operation cosmelenia.

3. The method of obtaining collective concentrate of ferruginous quartzite under item 1, characterized in that the heavy fraction of the primary phase coil separation is directed to prechistoy screw separation emitting light fraction in the tails and producing crude hematite concentrate finishing is carried out by hydraulic separation.



 

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Dry rub-off machine // 2514054

FIELD: machine building.

SUBSTANCE: proposed machine comprises cylindrical housing, initial material feed pipe, material discharge pipe and rotor drive. Initial material distributor composed of fixed cone is arranged directly above the rotor. Circular flanges are arranged at housing sidewall while fine dusty fraction discharge pipe is arranged at housing top section. Rotor fitted on the shaft in said housing is shaped to cylinder in height equal to rub-off zone and equipped with radial blades. It includes industrial blower is communicated with pipe discharging the fine dusty fraction along with airflow. Initial material feed pipe is arranged directly above initial material distributor. Finished product discharge pipe is arranged at housing bottom section.

EFFECT: higher efficiency of rubbing-off and separation.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to combined methods of separation of solid materials, particularly, to processing of radio electronic scrap. Proposed method comprises primarily two-step separation of solid materials by hammer crushers to required size, magnetic and screen separation of ground scrap with subsequent pneumatic classification by bulk density of oversize and undersize products of screen classification. Note here that ground scrap fraction of boundary size obtained at pneumatic classification is subjected to additional grinding at ball mill to size of nonmetallic component of not over 1 mm. To isolate metallic component of processed scrap aforesaid ground fraction is subjected to pneumatic classification by bulk density.

EFFECT: higher efficiency of processing.

FIELD: process engineering.

SUBSTANCE: invention relates to mining and can be used for extraction of valuable components and products of their processing, particular, for extraction of copper, nickel and iron sulphides and noble metals from aged tailings of suspended tailing pit of in cryolite zone of Norilsk deposits. Dressing module comprises open-pit field, two or three dredges, beach pump station consisting of stationary and vibratory screens, sunk basin with overflow pocket communicated by gravity feed hydraulic transport with open-pit field. Besides, it comprises two pump, pressure five-jet pulp separators communicated with vibratory screens, sunk basins and pump communicated with batteries of desliming 250 mm-dia hydraulic cyclones with their sand outlets connected via sunken basins and controlled-delivery pumps with said pressure five-jet pulp separators and, further, with rotary separators. Tailings from the latter are communicate by gravity feed hydraulic transport via appropriate sunk basin and controlled-delivery pump with mechanical camber flotation machine consisting of 130 m3-chambers. Concentrate outlet is communicated with appropriate sunk basin and controlled-delivery pump and, further, with pneumomechanical camber flotation machine consisting of four first-cleaner 17 m3-chambers. Concentrate outlet is communicated with appropriate sunk basin and controlled-delivery pump and, further, with pneumomechanical camber flotation machine consisting of four second-cleaner 8 m3-chambers. Module includes one or two giant jets installed in open-pit field lane, distribution box to direct portion of warm desliming drains by gravity feed hydraulic transport to open-pit field to accelerate tailing thaw and wash-off at two or more point of the pit and further direction to pit lane, screens mounted at beach pump stations, said screens feature 12-16 mm square meshes. Main flotation chamber has three chambers. Desliming hydraulic cyclones feature two cones with 20-10 deg-taper angle. Beach pump station sunk basin overflow pocket is additionally communicated by gravity feed hydraulic transport with two or three points of open-pit working board to return excess pulp into lane and to accelerate tailing thaw and wash-off.

EFFECT: higher yield and quality of flotation, decreased losses of valuable elements.

1 dwg

FIELD: concentration of minerals.

SUBSTANCE: proposed method includes disintegration of dust at simultaneous preparation of pulp and removal of foreign admixtures; operations are performed in scrubber-washing drum. Then pulp is admitted to pulp line in counter-flow; aeration of pulp is performed in pulp line by means of air bubbles of one size and duration of life no less than 1-2 minutes; proposed method includes also forming standing acoustic waves perpendicularly to pulp flow at frequency ωac corresponding to resonance frequency ω0 of air bubbles of one size 10. Action of centrifugal and acoustic fields on pulp is performed in acoustic chamber at hydrostatic pressure of 4-5 atm. Acoustic field is formed in acoustic chamber by waves of final amplitude at frequency ωac corresponding to resonance frequency ω0of air bubbles of one size 10 by means of acoustic radiators smoothly distributed over surface of acoustic chamber.

EFFECT: enhanced efficiency of entrapping fine gold.

7 dwg

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