The method of extraction of rhenium and other elements

 

The invention can be used to select scattered and rare elements, precious and non-ferrous metals from watered by natural (e.g., fumarole gases volcanoes) and industrial gases. The method of extraction of rhenium and other elements involves collecting volcanic gas cooling and trapping of the resulting compounds. This collection of volcanic gas is performed at a pressure in the collection of 20-100 PA, cooling is carried out to 300-400oC with the concentration of the compounds of rhenium and other elements. Capture separating the resulting solid compounds from the gas phase is carried out in the precipitator or the system electrostatic precipitators, while maintaining the gas temperature at the outlet of the electrostatic precipitator or a system of electrostatic precipitators at the level of 200-250oC. the Temperature of the gas in the electrostatic precipitator supported by the evaporation of water supplied in a spray form into the flue gas duct before the electrostatic precipitator. The collection of volcanic gas is carried out in the device, made of corrosion resistant materials. The method allows to allocate contained in the gas components in a complex and with a high degree of extraction, obtaining a concentrate with a high content of valuable elements suitable for processing of peroxidases select scattered and rare elements, precious and non-ferrous metals from watered natural volcanic and industrial gases.

There is a method of recovery of rhenium from kiln exhaust gases produced during the oxidation of molybdenum and copper concentrates [1]. In this way the gases after purification in a hot cyclone bubbled through a wet absorbers (water, acid or alkaline) of various designs. Captures up to 96% rhenium, the incoming gases. However, to extract rhenium and other items of gases with high moisture content, in particular from volcanic gases, this method of capture could not be applied because of the low concentrations of valuable components in gases, their concentrations in the pulp (the solution) will also be low, insufficient for profitable industrial extraction. In addition, the use of wet methods of capture compounds are valuable elements in relation to volcanic, for example fumarole gases containing 92-98% water vapor, will lead to high costs for the cooling of these gases and the condensation of the contained water. For example, for heat dissipation from the device for a wet trap by cooling it through the wall of one tonne of volcanic gases containing 95% water, with the tempo is the most similar to the invention of the technical nature of the method of extraction of rhenium and other metals, consisting in the concentration of rhenium and other metals contained in volcanic gases, deposition and their sulfides from the gas phase in a filtering layer consisting of particles of the medium [2]. According to this method, volcanic gases, having a temperature of 600oC and below (gases with a temperature of more than 600oWith pre-cooled to 500-550oC), passed through a filter bed consisting of particles of the carrier, within 1-30 days followed by replacement of the media, and the spent media containing sulfides rhenium and other metals, sent for hydrometallurgical processing. As the carrier proposed to use mineral wool, activated carbon, granular oxide of aluminum, carbon fiber or, preferably, natural zeolite fractions 1-8 mm

The disadvantages of this method are as follows: 1. When it happens selective capture only the rhenium sulfide and compounds of other elements. The ratio in the feed gas and unloaded carrier is almost the same for rhenium, cadmium, antimony and bismuth. At the same time, in comparison with the original carrier gas depleted (relative to the rhenium) silver - twice, Germany - 5.4 times, gold and India - 30-carscallen, and mechanical dust collectors. This leads to increased resistance of the layer and, consequently, to reduce consumption of gas, change in temperature and the need for frequent replacement of the layer (1-30 days). Thus, the process is almost unmanageable, and the degree of recovery of valuable elements decreases dramatically due to periods of replacement.

3. Aggressive environment (water combined with the acid gases - Hcl, HF, SO2) prevents effective mechanization of the process when frequent replacement of the media due to severe corrosion mechanisms.

4. Using media dramatically increases the volume transported and processed material.

These drawbacks are eliminated when using the proposed method.

The problem to address with the proposed method, achieving almost complete and comprehensive recovery of valuable elements from volcanic and similar gases rich in dehydrated bulk concentrate. To solve it we need 1. To provide the conditions for transition in liquid and solid state compounds of these elements contained in the gas. As can be seen from the attached table, this is achieved by cooling the gas to tempera 2. To prevent the condensation of water, a major component of volcanic gas, i.e., the separation of the bulk concentrate from the gas phase to produce at temperatures above 100oC.

3. To prevent the selection from volcanic gas to elemental sulfur by reaction occurring at a temperature of 250oWith [4] and below 2H2S+SO2=2H2O+3S.

Due to the relatively high content of hydrogen sulfide and sulfur dioxide in volcanic gas (example) number of escaping liquid sulfur can increase the amount of rare earth concentrate, respectively, lowering its quality. This will be difficult as the system recovery concentrate and processing of the latter. The technical result achieved by the proposed method lies in the allocation of volcanic gas 90-96% contained rhenium and other valuable items in the form of a rich collective concentrate.

The technical result is achieved in that the method comprises collecting volcanic gas cooling and trapping compounds, and the collection of volcanic gas is performed at a pressure in the collection of 20-100 PA, cooling lead to a temperature of 300-400oC concentration with phase is carried out in the precipitator or the system electrostatic precipitators, while maintaining the gas temperature at the outlet of the electrostatic precipitator or a system of electrostatic precipitators at the level of 200-250oC. the temperature of the gas in the electrostatic precipitator is supported through the evaporation of water supplied in a spray form into the flue gas duct before the electrostatic precipitator. The collection of volcanic gas is carried out in the device, made of corrosion-resistant material.

The collection of volcanic gas is carried out using a special device under conditions that prevent its mixing with air. This eliminates the possibility of oxidation of the rhenium sulfide with getting more difficult condensed from the gas phase oxide [1], and prevents condensation of water dissolved in it, acid gases (Hcl, HF, SO2) and the formation of highly corrosive fluids.

Partial cooling of the collected gas occurs due to the natural loss of heat refractory-lined (for corrosion protection) duct through which gas is transported from the collector to the electrostatic precipitator. The amount of heat loss is possible during installation to adjust the thickness of the insulation of the flue, and it must be designed for the most harsh winter environment. The final exact adjustment of the temperature to a predetermined value according to the proposed method produces water supplied into the flue gas duct through the nozzle with mechanical sprayed the cooling of 1 kg of water vapor from 500 to 400oWith spent ~0.06 kg of water, and by increasing the volume of processed gas by 6-7% (adjusted for other components of volcanic gas) there is no need to build complex and expensive heat exchangers.

Defines the normal operation of the precipitator the gas temperature at the outlet of the apparatus, practically equal to the temperature of the beginning of the formation of elemental sulfur from sulfur dioxide and hydrogen sulfide and substantially higher than the temperature of condensation of water. Higher gas temperature at the inlet to the electrostatic precipitator (system electrostatic precipitators) provides heat reserve to compensate heat loss in the capture process commercial product. Work in the specified conditions, such high-performance devices, as precipitator, provides fullness and complexity of the recovery of valuable components (up to 90-96%).

Separated from volcanic gas bulk concentrate is collected in the hopper is unloaded and sent for recycling pyrohydrolysis methods.

The gas after separation of the concentrate, containing compounds of rare and trace elements, precious and non-ferrous metals, as well as their associated elements, are referred to wet trapping for vias composition, mol. %: H2O 92-98; N20,002-1,3; CO20,5-2,5; 0.2; SO20,1-2,3; H2S 0,1-0,7; HCl from 0.01 to 0.8; HF to 0.08; N20,06-0,6; O2to 0.15; Ar to 0.005; CH4to 0.21; containing, g/t: Re 0,8; Ge 0,6; Ag 0,08; Au 0,2; In 0,8; Bi 0,5; Tl 0,12; 70 Zn; Cd 0,3; Sb 1,5; Ni 40; 5,8; Mo 0.12 each. The gas temperature is 500-600oWith the pressure in the collection - 60 PA.

Before serving in the electrostatic precipitator volcanic gas is cooled to 400oC. the temperature of the gas at the outlet of the electrostatic precipitator is 250oC.

The total content of sulfides and other compounds, transition to the solid state upon cooling of the specified gas to the operating temperature of the electrostatic precipitator and perceive it, is about 0.9 kg per tonne of volcanic gas.

The product discharged from the electrostatic precipitator contains, g/t: Re 890; Ge 670; Ag 89; Au 220; In 890; Bi 550; Tl 130; 330 Cd; Zn 75000; Sb 1700; Ni 44000; 6400; Mo 130.

The obtained concentrate compared to the concentrate obtained by the method adopted for the prototype differs significantly higher content of valuable items associated with rhenium in the volcanic gas. It is suitable for extraction of rhenium and other elements pyrohydrolysis methods.

Technical efficiency of the proposed method of extraction of rhenium and other elements from volcanic integral extraction of valuable components from volcanic gas, new raw material source in the first place trace elements. The proposed method allows for almost full allocation in complex concentrate scattered and precious items, rare and non-ferrous metals in a form suitable for further pyrohydrolysis processing.

SOURCES OF INFORMATION 1. Lebedev, K. B. Rhenium. - M.: Metallurgizdat. 1959. 102 S.

2. Suderman F. I. , A. Kremenetsky, A., Steinberg, S. method for the recovery of rhenium and other metals. RF patent 2159296, IPC 22, 61/00, 01 D 7/02, Appl. 10.06.1999, publ. 20.11.2000. Bull. 32.

3. Koronovskii I. T., Nazarenko, Y. P., Ncrac E. F. Quick reference for chemistry. - Kiev: Naukova Dumka. 1974. 992 S.

4. Concise encyclopedia of chemical. - M.: Soviet encyclopedia. 1965. So 4. 1182 C.

Claims

1. The method of extraction of rhenium and other elements, including the collection of volcanic gas cooling and trapping compounds, characterized in that the collection of volcanic gas is performed at a pressure in the collection of 20-100 PA, cooling lead to a temperature of 300-400C with the concentration of the compounds of rhenium and other items, and capture separating the resulting solid compounds from a gas strofilia or system of electrostatic precipitators at the level of 200-250C.

2. The method according to p. 1, characterized in that the temperature of the gas in the electrostatic precipitator supported by the evaporation of water supplied in a spray form into the flue gas duct before the electrostatic precipitator.

3. The method according to p. 1, characterized in that the collection of volcanic gas is carried out in the device, made of corrosion-resistant materials.

 

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FIELD: hydrometallurgy.

SUBSTANCE: method involves use of alkali solutions containing excess of oxidant, namely alkali metal metaperiodates, at temperature 70-80є.

EFFECT: enabled dissolution of alloy.

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