Method for integrated development of steam coal deposit

FIELD: mining.

SUBSTANCE: method includes detailed research of material constitution of coal beds to detect metals of the platinum group that are subject to associated extraction. Selective mining of coal is performed, at the same time the coal with higher content of osmium is separately supplied to a coal-burning plant, such as a boiler house of the coal burning plant. The osmium-containing coal is burnt in a furnace of a low-temperature boiling layer of a water-heating or steam, boiler with at least double surplus of air supplied for burning, compared to theoretically necessary one, temperature in the volume of the boiling layer is maintained at the level of 80050C. Gaseous combustion products are sent into an emulsifier, in which from them they first remove large ash particles, then their contact is provided with a solution of alkali, such as NaOH; products of reaction of smoke gases with the alkali solution are discharged from the emulsifier and sent to recover osmium to metal.

EFFECT: invention makes it possible to increase efficiency of integrated development of steam coal deposits.

1 dwg

 

The alleged invention relates to mining, in particular, to the integrated development of coal deposits, and can be used in the development of deposits of coal, the coal composition of matter which is an element of the platinum group metal is osmium.

The known method is mined underground leaching, in which minerals are selectively dissolved in situ, and formed in the reaction zone of a chemical compound extracted to the surface. Underground leaching can be accomplished by traditional mining technology (when prepared in mine workings treatment blocks minerals or rocks are subjected to irrigation with appropriate solutions). To intensify the process of leaching using special bacteria or superimposed on the region of the extraction of minerals of different physical effects, for example, a heated solvent, preliminary roasting of minerals under the ground, passing electric current, and others [1]. The disadvantage of this method is low efficiency of coal mining.

The closest analogue, taken as a prototype, is a method of integrated development of deposits of coal, allows the speaker to allocate raw material for production of platinum group metals. The method involves a detailed study of the material composition of the coal seams, the detection of platinum group metals, to be associated extraction, selective development of coal seam, the transmutation of elements of the platinum group metals in chemical compounds change their aggregate state by burning coal in a grate furnace boiler with the formation of gaseous products of combustion, the extraction of these compounds from the overall flow and recovery of valuable components [2].

The disadvantage of the prototype is that when using it you can't select the raw materials for such element of the platinum group metals as the OS, because the OS forms a volatile compound with oxygen at a temperature of about 800C, and in the usual grate furnace combustion temperature of the fuel layer is much higher and the amount fed to the furnace air only provides an acceptable level of fuel combustion. Considering that the OS is widely represented in the samples of the Kuznetsk coal, and the cost for one gram of osmium by several orders of magnitude higher than the cost of coal, the loss of such a valuable component of the material composition of the coal reduces the efficiency of the integrated development of deposits of coal.

The purpose of the invention is the improvement of efficiency of complex development of the energy angle is with a high content of the element of platinum group metals, in particular, osmium by creating conditions of formation of volatile compounds of the metal with oxygen during the combustion of coal and carbon capture them from the products of combustion with subsequent recovery of osmium to the metal.

This goal is achieved by a method for integrated development of deposits of coal, including a detailed study of the material composition of the coal seams, the detection of platinum group metals, to be associated extraction, selective dredging coal with a high content of platinum group metals, a separate supply of coal on plesiosauria enterprise, the transformation of elements of the platinum group metals in chemical compounds change their aggregate state by burning coal in a grate furnace boiler with the formation of gaseous products of combustion, the extraction of these compounds from the overall flow and recovery of valuable components, oslistarray coal is burnt in the furnace of a low-temperature fluidized bed with not less than two abundantly supplied for combustion air, compared with theoretically necessary, the temperature in the volume of the fluidized bed is maintained at a level of 80050C, gaseous products of combustion are directed to the emulsifier, which of them first remove the large ash particles, then they provide contact with rest the rum alkali type of NaOH; the interaction products of the flue gas with an alkaline solution is removed from the emulsifier and is directed to the recovery of osmium to the metal in a known manner.

The method is illustrated by the diagram of combustion and trapping of the gaseous combustion products of coal.

The method can be implemented as follows. During the development of deposits of coal is the study of the material composition of the coal seams. The coal mined from seams (or from a specific layer of a layer by selective excavation) with elevated concentrations of osmium, separated from the General flow of the extracted rock mass and sent for processing to obtain omistamisega raw materials.

This can be used one of the hot water (steam) boilers, boiler room, which is part of this coal-mining enterprises, for example, the boiler type 1 representatives of the Committee (COC), equipped with a furnace NCTS (low-temperature fluidized bed), and an ash device 2, which can be used emulsifier.

Emulsifier 2 contains vertically oriented

a cylindrical housing 3, the dispenser irrigating fluid 4, the pipe 5 supply irrigating fluid, the vane swirler 6 gas pipe 7 for supplying the contaminated gas, the cyclone 8, bottom funnel 9, the nozzle 10 drain the fluid, the pipe outlet ash 11 and the outlet 12 of the drainage PTS the seal gas.

Vane swirler 6 made in the form of a hard disk to the hub 13 and the guide vane apparatus 14. Swirl 6 is installed in the inner space of the cylindrical body coaxially him. In the hub 13 of the swirler 6 through a bearing 15 mounted dispenser 4.

The dispenser 4 is made in the form of plates with conical bottom and an axis 16. The dispenser 4 is a top cone bottom, upward, and the axis 16 - down. On the axis 16 of the fixed blade unit (impeller) 17. Dispenser with 4 swirler 6 divides the internal space of the cylindrical body 3 of the emulsifier into two parts, upper and lower.

The pipe 5 is installed in the upper part of the body on its axis and is designed to supply irrigation fluid to the dispenser 4.

The cyclone 8 is installed in the lower part of the inner space of the cylindrical housing 3 coaxially him and has a diameter smaller than the inner diameter of the cylindrical body of the emulsifier.

The pipe 7 enters into the inner space of the cylindrical body 3 of the emulsifier hardline, i.e. along the chord, and in the cyclone 8 - tangentially, i.e. tangentially and are welded to the cylindrical housing and the cyclone on transitional lines of intersection of the cylindrical surfaces.

The operation of the boiler equipment to obtain omistamisega raw materials is as follows. When the supply to the boiler coal increased the th content of osmium one (or more) boiler with a firebox low-temperature fluidized bed are transferred to the combustion of coal.

When burning coal with a high content of osmium in boiling low-temperature layer (temperature in the layer is maintained at 800-850C) to introduce an increased amount of excess air (at least two times more than necessary for complete combustion of the fuel); through the pipe 5 into the emulsifier serves irrigating liquid is an alkaline solution of NaOH. With this OS, which is part of the coal substance is sublimated in the form of osmium tetroxide (OSO4together with the flue gases leaving the boiler.

The pipe 7 flue gases pass into the lower part of the emulsifier 2, in particular, in the cyclone 8. In the cyclone 8 gas stream twists and centrifugal force pressed against the inner surface of the cyclone; under the action of friction of the solid particles lose their energy and the nozzle 11 are derived from the emulsifier. Cleaner, consequently, lighter part of the gas stream exits the cyclone 8 up. Because of the significant difference in the diameters of the inner surface of the cylindrical body 3 of the emulsifier and of the cyclone 8 gas stream at the outlet of the cyclone loses its energy. This leads to a twofold effect: gas cleaning from mechanical impurities, as the heavier impurities lose speed and fall further down; more uniform distribution of gas over the cross section of the housing. Due to the vacuum created in the emulsifier, for example,exhaust fans, the gas flow upwards and comes first on the blades of the impeller 17, and then into the annular gap between the cylindrical casing 3 and the spout 4. The impeller 17 and the dispenser 4 spin up. When irrigating liquid in the dish dispenser, under the action of centrifugal force falls off with the edge of the dish and into the annular gap, which has a blade unit 14 swirl 6. Due to the installation of the blades at right angles to the axis of the emulsifier of the gas stream passing through the swirler 6, is twisted in the direction opposite to the direction of rotation of the metering device 4, and the output meets with irrigating fluid, forming a stable, rapidly rotating layer of gas-liquid mixture - emulsion, which is whipped in a fine foam ring surrounding the space above the annular gap. Subsequent gas stream passes through the foam ring. This provides a guaranteed contact of flue gas with irrigating fluid. As a consequence, the osmium tetroxide (OSO4), interacting with alkali (NaOH), forms Promat Na[OsO2(OH)4] - raw material for production of osmium. In addition, the flue gases are cleaned from small mechanical impurities. The cleaned gases leave the emulsifier through the pipe 12, and Promat sodium in the form of waste emulsion - through pipe 10.

Setting qi is the womb of 8 in the lower part of the inner space of the housing 3 coaxially with him allows flue gas cleaning from mechanical impurities. In addition, achieved disorientation gas flow, whereby the gas more evenly along the circumference enters the annular gap between the casing 3 and the spout 4. Consequently, all of the blades 14 of the swirler 6 are ravnoduhsnymi gas stream.

The unwinding of the dispenser of the gas flow provides a more uniform inflow irrigation liquid (alkali) along the circumference of the annular gap and, as a consequence, stabilizes the height of the rotating emulsion layer, and it reduces the likelihood of leakage of flue gases without contact with the irrigation fluid.

Untwisting the flow of gas and the irrigation fluid in different directions increases the difference between the relative velocities of gas and liquid in the emulsification, providing increased foaming of the emulsion. The bubbles become smaller and their number increases, consequently, increases the surface area contact of the flue gases, in particular, osmium tetroxide - OSO4, with irrigating liquid (alkali NaOH), resulting in not only the education of paremata sodium - Na[OsO2(OH)4]but also better for gas purification from mechanical impurities, in particular, ash particles.

Thus, the goal can be accomplished: by burning omistamisega coal in the furnace of the fluidized bed created the conditions for the formation of the osmium tetroxide - volatile compounds of osmium with oxygen; by passing the flue gases through the cyclone installed inside emulsifier, provides a rough purification of gases from ash particles; by passing flue gas through the foam layer of alkali ensures the capture of volatile compounds of osmium and transfer them in a fluid state for subsequent recovery of osmium to the metal in a known manner.

Sources of information

1. They M.L. Technology, mechanization and organization of underground mining / M. Zhigalov, S.A. USSR author's certificate. - M.; Subsoil, 1999. - 423 S. (s - equivalent);

2. Method of integrated development of coal / Patent 2448250 of the Russian Federation, the application 2010141233, publ. 20.04.2012, bull. No. 11 (prototype).

Method for integrated development of deposits of coal, including a detailed study of the material composition of the coal seams, the detection of platinum group metals, to be associated extraction, selective dredging coal with a high content of platinum group metals, a separate supply of coal on plesiosauria enterprise, the transformation of elements of the platinum group metals in chemical compounds change their aggregate state by burning coal in a grate furnace boiler with the formation of gaseous products of combustion, the extraction of these compounds from obseg the flow and recovery of valuable components, characterized in that oslistarray coal is burnt in the furnace of a low-temperature fluidized bed with not less than two-fold excess of supplied combustion air, compared to theoretically necessary, the temperature in the volume of the fluidized bed is maintained at a level of 80050C, gaseous products of combustion are directed to the emulsifier, which of them first remove the large ash particles, then they provide contact with the alkali solution type of NaOH; the interaction products of the flue gas with an alkaline solution is removed from the emulsifier and is directed to the recovery of osmium to the metal.



 

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FIELD: mining.

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2 ex

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