The method of extraction of rhenium and other metals
(57) Abstract:The invention relates to methods for extracting rare metals and can be used for separation of rhenium and other rare and precious metals from gas emissions from active volcanoes, fumaroles gases, gas emanations lava flows, lava lakes. The concentration of rhenium and other rare metals by formation of volcanic gas rhenium sulfides and other rare metals in the volume of the layer comprising particles or fibers with a developed surface by passing the volcanic gas through this layer. Temperature volcanic gas should be in the range of 300-600oC. If the gas temperature is above 600°C pre-cooled to 500-550°C. thus Obtained concentrate is processed hydrometallurgical method. Layer, through which pass volcanic gas, form a natural zeolite, mineral wool, activated carbon or carbon fiber, aluminum oxide. The method allows to extract the measurements of volcanic gas without the cost of reagents and to obtain a concentrate of rhenium in a form suitable for further hydrometallurgical processing of known methods. 4 C.p. f-crystals, 3 tab., 3 Il.
Vano for separation of rhenium and other metals (Bi, Ge, In, Au, Ag, Cd, Sb, etc.) of new types of mineral raw materials, in particular gas emissions from active volcanoes, for example, from fumarole gases, gas emanations lava flows, lava lakes, etc.For industrial production of rhenium is used to remove it from the flue gases oxidizing roasting of molybdenum and copper concentrates. Rhenium in these gases is present in the form of volatile heptaoxide Re2O7that is extracted from the gases by adsorption in aqueous solutions of sulfuric acid (acid leaching) or saline solutions of sulfites of alkali metals [1, 2]. Rhenium is also extracted from industrial underground leaching solutions organovanadium ore
The closest the merits of the claimed invention is a method, according to which the flue gases roasting of sulfide concentrates (molybdenum or chalcopyrite, bornite, chalcosine, etc.) should be treated in the absorber solution of sulfuric acid. If this Re2O7from the gas phase into sulfuric acid solution, from which is extracted by methods of ion exchange or solvent extraction followed by separation of the final product (mostly ammonium perrhenate NH4ReO4)  . However, for the extraction of rhenium from new t concentration of rhenium in the raw material concentration in the sulfuric acid solution will also be low, insufficient for profitable industrial metal recovery. The method does not have the necessary selectivity: in the known process is not provided by the Department of rhenium and other metals from the components of the micro-compound raw material. In addition, in areas with sufficient rhenium new types of raw materials, absence of industrial infrastructure and high transport costs for delivery of the necessary reagents (in particular, sulfuric acid).The technical result of the proposed method is to achieve selective separation of rhenium and other metals (Bi, Ge, In, Au, Ag, Cd, Sb) from other components of raw materials to produce rare metal concentrate, characterized by high contents of rhenium and other valuable components, suitable for further industrial processing. The process of obtaining primary rhenium-rare-metal concentrate is virtually no cost of reagents.The technical result is achieved by using as a new type of mineral raw materials on rhenium and other metals (Bi, Ge, In, Au, Ag, Cd, Sb, etc.) gas emissions from active volcanoes, for example, fumarole gases, gas emanations lava flows, lava lakes, etc., reaching some volcanoes n x 10,000 tons/day, allow to consider volcanic gases as a new source of mineral raw materials, providing the necessary levels of production with virtually no cost gornodobyche work. Volcanic gas is passed through the filter layer having a developed surface and consisting of particles of the medium mineral or carbon composition. The filter layer may also be formed of fibrous materials of similar composition. The layer of particles is heated to a temperature noise volcanic gas (300-600oC). If the gas temperature is above 600oC pre-cooled to 500-550oC. the Concentration of rhenium and other rare metals by formation of volcanic gas sulphides rhenium (ReS2), bismuth (Bi2S3), cadmium (CdS), Germany (GeS2) and other metals, which are deposited on the carrier particles or fibers in the layer volume. Thus obtained product is processed with extraction of rhenium and other metals known methods.As the material forming the layer, through which pass volcanic gas, use of natural zeolite, mineral wool, activated charcoal or coal is STV proposed method of extraction of rhenium and other metals from volcanic gas is that volcanic gas containing within 0.00001 - 0.001% of rhenium and other metals, without pre-cooling or pre-cooling to 500-550oC is passed through the filter layer formed by active media. As the carrier used natural zeolite, granulated to a particle size of 1-8 mm; can be used as activated carbon, mineral wool, granulated aluminum oxide, the carbon fiber. Volcanic gas with a temperature of more than 600oC pre-cooled to a temperature of 500-550oC. by passing the gas at a temperature of 600oC and below through the layer of the medium latter is heated to the temperature of the gas.Pre-cooling of volcanic gas with a temperature of more than 600oC is necessary, since the formation of rhenium sulfide from volcanic gas flows more fully at temperatures of 400-550oC. In Fig. 1 shows the content of rhenium in the media (natural zeolite) depending on the noise temperature volcanic gas (time passing the gas through a layer of the carrier 10 days). From this figure it follows that at temperatures exceeding 600oC the formation of rhenium sulfide from volcanic gas flows with low intensity of rhenium in the media at temperatures of <300C, shown in Fig. 1 due to the low content of rhenium in non-refrigerated volcanic gas having a temperature of <300C.In the interaction of volcanic gas with the surface of the carrier on the last deposited sulfides rhenium and other metals. Upon reaching the media content of rhenium from 0.3 to 1.0 kg/ton (0.03 to 0.1 wt.%) it is replaced.Metal content in different samples of media through which was skipped volcanic gas, are given in table. 1-3.From table. 1 shows that the content of rhenium in the zeolite increases with increasing time of passing the gas through the layer. The maximum content of rhenium marked for gas with a temperature of 760oC, pre-cooled to 550oC (640 g/t), and for gas with a temperature of 580oC without pre-cooling (550 g/t). In addition, after the transmission of volcanic gas through a bed of zeolite at last there was enough for industrial extraction of the concentrations of other rare metals: Bi - 400 g/t, Tl - 15 g/t, In up to 15 g/t, Ge - to 55 g/t, Au - 1-5, Ag - 1-50.From table. 2 it follows that the carbon fiber absorbs metals from volcanic gas, but this material is able to operate only when the temperature high content of bismuth (up to 2600 g/t). This is because the sulphide of bismuth from volcanic gas is deposited mainly in the temperature range of less than 400oC. the content of other rare metals in samples of guledani after transmission of volcanic gas is less than 1 g/T. Thus, the carbon fiber has almost no advantages over natural zeolite as a sink for metals.From table. 3 shows that mineral wool, granulated activated carbon and granular aluminum oxide also does not have advantages over natural zeolite from the point of view of extraction of rhenium. For each of the tested media content rhenium lower than that achieved on natural zeolite. The content of other metals on carriers after passing the volcanic gas is comparable or lower than the achieved grades on natural zeolite.The data table. 1-3 show that the deposition of sulfides of metals from volcanic gas is possible in almost all tested media, but most intensively this process runs on natural zeolite, which allows to achieve the highest content of rhenium and other metals.The fact of the formation of sulfides of metals from volcanic gas on top of the Muta, formed from volcanic gas on the surface of natural zeolite.Media (natural zeolite, activated carbon, etc.) containing sulfides rhenium and other metals hydrometallurgical process known method, for example, described in [5, 6]. While the rhenium and other metals become productive solution from which you are retrieving them, and the rest of the media can be reused.Thus, it is shown that the required technical result consists in the selective allocation of rhenium and other metals from volcanic gas with obtaining rare metal concentrate, characterized by high contents of rhenium and other valuable components and suitable for further industrial processing, is achieved by passing the volcanic gas through the filter layer consisting of particles of the medium mineral or carbon composition or fibrous materials of similar composition. The precipitation of sulphides rhenium and other metals in the filter layer most effectively takes place at temperatures less than 600oC. Gases with temperatures of more than 600oC must be pre-cooled to 500-550oC.Pring> 0,1-2,4; H2S 0,2-0,7; HCl 0,1-0,8; HF of 0.005 to 0.08; N20.1 to 0.6; Ar 0,0005-0,005; CH40,0001-0,0013 containing (g/t): Re 1-5; Ag 0.1 to 0.4; Au of 0.1-0.5; Zn 20-150; Cd 0,2-2; Sb 0.2 to 5; Bi 0,1-0,9; Ge of 0.3-0.8; In 0,1-1,6, with a temperature of 550oC carry out the extraction of rhenium and other metals by precipitation of sulphides, passing the gas through a filter bed of natural zeolite fractions 3-8 mm for 18 days. After unloading media, it identified the following content of rhenium and other metals (g/t): Re - 640; Mo - 200; Bi 100, Cd - 230; In - 3; Ge - 25; Tl - 10; Ag - 30; Au - 2; Sb - 150. The spent media is used for hydrometallurgical extraction of rhenium associated with the production of other metals.Technical efficiency of the proposed method of extraction of rhenium and other rare metals from volcanic gas is that when using the proposed method becomes possible and economically feasible extraction of rhenium from volcanic gas, which is a new raw material source and is characterized by significant industrial resources of rare and precious metals, primarily scarce rhenium. The proposed method allows for selective separation of rhenium and accompanying metals from volcanic gas is almost the TCI known and commercially available methods.Literature
1. Spedden H. Process for recovering volatilized rhenium oxides and sulfur oxides from gas streams. U.S. patent N 3723595, CL 01 G 47/00, Appl. 12.07.1971, publ. 27.03.1973.2. Platzke R. , H. Spedden Process for recovering volatilized metal oxides from gas streams. U.S. patent N 3783158, CL 01 G 47/00, Appl. 27.12.1971, publ. 01.01.1974.3. Chemistry and technology of rare and scattered elements. Part III. Ed. by K. A. Bolshakova. - M.: Higher school. - 1976, S. 277-315.4. Sable C. I. , Hedgerow E. I., Shcherbakov C. A., J. Gukasyan, the Principles of environmentally friendly processing circuit molybdenum-rhenium concentrates. - In the book: Chemistry, technology and analytical control of rhenium (V all-Union scientific-technical meeting). Collection of scientific papers. - M.: 1990. - S. 112-117.5. Hedgerow E. I., Voinova centuries Some features of the decision of tasks of ion-exchange extraction and separation of rhenium and molybdenum from the mixed aqueous solution. - Ibid. - S. 145 - 149. 1. The method of extraction of rhenium and other metals, including the concentration of metals from the gas phase on a solid medium and the subsequent allocation of compounds of rhenium and other metals retained on the media, hydrometallurgical methods, wherein the concentration of rhenium and other metals conduct of volcanic gas sadakat through the filter layer of the device within 1 30 days with the subsequent replacement of the media, and the spent media containing sulfides rhenium and other metals, sent for hydrometallurgical processing.2. The method according to p. 1, characterized in that the volcanic gas is passed through the filter layer of the device at 300 - 600oC.3. The method according to p. 2, characterized in that the volcanic gas with a temperature above 600oC before passing cooled to 500 - 550oC.4. The method according to p. 1, characterized in that as the carrier using natural zeolite fraction 1 - 8 mm5. The method according to p. 1, characterized in that as the carrier used mineral wool, or activated carbon or granular aluminum oxide, or carbon fiber.
FIELD: enrichment of uranium isotopes.
SUBSTANCE: the invention presents a sublimation apparatus and is dealt with the field of enrichment of uranium isotopes. The apparatus contains a cylindrical body (1) encased in a heat-insulating casing (2). In the center of the apparatus there is an insert (24) filled in with a neutron absorber, for example, with boron carbide. The ring-type sublimation chamber (3) and the chamber for heat-transfer agents (4) are mounted coaxially to the insert (24). The apparatus works in modes of desublimation and a sublimation. At operation in the mode of desublimation through a connecting pipe (9) into the ring-type collector (8)they feed a refrigerant distributed through heat exchange tubes (10) of the chamber for heat-transfer agents (4). Waste refrigerant is removed from the chamber (4) through a manifold (11), removing pipes (12), the ring-type collector (13) and a connecting pipe (14). The walls (5 and 6) of The sublimation chamber (3) are heated by a heater (7). A mix of vapors of uranium hexafluoride and noble gases is fed through a connecting pipe (19), distribute it along a ring-type space of the upper part of the chamber (3)and fed into ring-type cells (21). Desublimation of uranium hexafluoride is carried out on the surface of the heat exchange pipes (10) and on cross-connectors 22. Aerosols are sublimated at contact with heated walls (5 and 6). With the help of a flanging (16) on partitions (15) duration of contact of the aerosols with the walls (5 and 6) is increased. Due to that a degree of desublimation of uranium hexafluoride is increased. The surface of desublimation is enlarged due to the connectors (22). At operation in the sublimation mode the feeding of a refrigerant and a mix of vapors of uranium hexafluoride with a noble gas is stopped. Using the heater (7) the temperature in the apparatus is raised up to the temperature of uranium hexafluoride sublimation. Products of sublimation are removed through a connecting pipe (23). The apparatus is reliable, cost-saving, allows to increase a degree of trapping of uranium hexafluoride.
EFFECT: the apparatus is reliable, cost-saving, allows to increase a degree of trapping of uranium hexafluoride.
4 cl, 3 dwg
FIELD: gas-production industry and petrochemical industry.
SUBSTANCE: the invention presents a device for drying of gases by freezing-out and is dealt with the field of gasses drying devices. The device includes a vortex pipe, pipelines with the fixture, freezing out heat exchangers, a gas-distributing device mounted with a capability to feed either cool, or a hot gas from the vortex pipe into coiled pipes of heat exchangers. At that the inter-pipe space of the heat exchangers is connected with a pipeline of the humid gas delivery and a pipeline of the dried gas withdrawal. The vortex pipe is connected with a pipeline of the dried gas withdrawal and the coiled pipes outlet is connected with the pipeline of the dried gas withdrawal through an ejector. The device in addition has a pipeline connecting the pipeline of the humid gas reception through an adsorber with the pipeline of the dried gas withdrawal. The lower parts of the heat exchangers are used in the capacity of water-oil separators. The invention ensures an increase of efficiency and reliability of the device operation.
EFFECT: the invention ensures increased efficiency and reliability of the device operation.
3 cl, 1 dwg
FIELD: chemical industry; petrochemical industry; other industries; devices for extraction of the crystalline matters from a gaseous phase.
SUBSTANCE: the invention is pertaining to the devices for extraction of the crystalline matters from a gaseous phase and may be used in chemical, petrochemical and other industries. The desublimator includes at least one motionless cylindrical body with the stationary knives and their cooling jacket, an internal rotating drum with the knives passing at rotation through the intervals of the stationary knives, the collector of the crystals. The motionless cylindrical body is established vertically on the hatch, the internal rotating drum is made in the form of a set of the hollow conical lenses, the internal and external diameters of which are tightly connected among themselves. On the outside diameters of the disks there are the mounted knives having the delta shape. On the external motionless cylindrical body there are knives having a rhomb shape, the front part of which is located in the cavities between the conical disks of the lenses. The lower butt of the vertical motionless cylindrical body of the desublimator is established on the hatch of the horizontal collector of the crystals, inside which there is a screw-type stirrer with the screw vane. In the upper part of the collector of the crystals there is a union of the gases outlet, and in the lower part of the collector - a union for the crystals withdrawal. The invention allows to increase the heat-exchange surface of the desublimator at a moderate volume and to raise its production capacity.
EFFECT: the invention allows to increase the heat-exchange surface of the desublimator at a moderate volume and to raise its production capacity.
4 cl, 2 dwg
FIELD: cleaning gases from solvent vapors converted into condensate suitable for further use; mechanical engineering, petrochemical, chemical and other industries.
SUBSTANCE: proposed plant includes hermetic chamber 1 with gas exhaust branch pipe 2 in its upper part and drain branch pipe 23 fitted in lower bottom 22, gas inlet 4 and inlet branch pipe 5 provided with swirler 6 with radial outlet. Secured coaxially with inlet branch pipe 5 is circular collector 7 for cryogenic fluid with inlet branch pipe 8. Contact heat exchanger 9 is formed by truncated taper ferrule 10 whose larger base is secured to upper bottom of chamber through circular collector 7 and lesser base is provided with widening attachment 11 directed towards lower part of chamber. Mounted between contact heat exchanger and side wall of chamber 1 is circular filter 12. Inner wall of cryogenic fluid collector 7 has tangential outlet holes opposite which circular guide made in form of projection on bottom 3 is located. Heating heat exchanger 24 and bottom filter 20 are mounted in lower part of chamber. Heat exchanger is provided with central body 17 located below swirler 6 of inlet branch pipe 5 and screw drive 19 for motion along heat exchanger axis forming circular passage for separated suspension and performing function of pressure fluctuation damper, thus making it possible to increase flow rate of cryogenic fluid at increased concentration of solvent vapor in gas being cleaned and flow section for discharge of suspension formed at dispersion and to reduce flow rate of cryogenic fluid at reduced concentration.
EFFECT: enhanced efficiency.
7 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: proposed device comprises two desublimators with orifices to feed desublimated product vapor and cold carrier gas. Aforesaid desublimators have vapor-gas distributed chambers with grates and sublimators, mixing chamber and ready-product separation units. Aforesaid horizontal mixing chamber has its lower part representing truncated part of a cylinder or cone, while upper part represents a variable-cross section box. Ratio of maximum-to-minimum cross sectional areas makes 1.25 to 2.
EFFECT: high-quality, finely- and ultra-dispersed mixes in products with volume not over 5 mg.
4 dwg, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to desublimation and may be used in chemistry and pharmaceutics to make fine- and ultra-dispersed materials in minor volumes of products. Proposed solids desublimator comprises two desublimators with openings to feed vapor of product to be desublimator and cold carrier gas that are provided with vapor and gas distributing chambers with grids and sublimators, horizontal mixing chamber and finished product separation units. Mixing chamber is divided into sections by horizontal baffles with height not exceeding half the height of the chamber. Odd baffles are arranged at chamber bottom while even baffles are mounted atop the chamber. All walls and baffles of said chamber are perforated. Chamber bottom perforation represents alternating zones confined by baffle arranged at the bottom and having even number of zones while that confined by baffle made atop the chamber has odd number of zones. Odd zones have clear area of (0.25-10)% while that of even zones is one and a half or two times greater.
EFFECT: reduced sticking to desublimator walls, higher yield of finished product.