Method for extraction and processing of molybdenum-containing ores

FIELD: mining.

SUBSTANCE: invention refers to the mining industry and may be used during extraction and processing of molybdenum-containing ores. A method for extraction and processing of molybdenum-containing ores involves open-pit field zoning, outlining of solid ore sections different by processing characteristics, selective extraction on the outlined sections with ores allocation to separate the flow from the zones with increased molybdenite oxidation and its direction to luminescent separation. A powellite enriched product of separation after its size degradation is directed to bulk floatation obtaining a rough molybdenic concentrate. Then after molybdenite oxidation in the rough concentrate, powellite is leached in an environment of a molten mixture of chloride and sodium silicate. The tail product of separation after its size degradation is directed to bulk floatation obtaining the molybdenic concentrate.

EFFECT: increasing a level and quality of molybdenum extraction to the end product from balance molybdenum ores with higher degree of molybdenite oxidation.

1 dwg

 

The invention relates to the mining industry and can be used in the extraction and processing of molybdenum-containing ores.

Well-known and widely used method of mining and processing of molybdenum-containing ores, including process mapping, zoning career field with selection of different technological types of ores, in particular, with varying degrees of oxidation, averaging to limit in arriving at the processing plant the ore stream content oxidized molybdenum ores limit set enrichment technology value. Incoming ore stream after grinding is subjected to flotation enrichment (Mineralogical-technological mapping of ores of various parts of the Tyrnyauz field with the aim of developing methods of quality control of ore. Volume I. Report on the research. - L.: Mekhanobr, 1980.). This technology has been successfully working with a relatively small degree of oxidation of molybdenite in the ore, when, without restricting mining activities, without interim storage of oxidized ores, there is a possibility to raschitivat with ores with a low degree of oxidation. But even in this case, need more space in your career for the organization blending warehouses. In addition, to eliminate the hard technological communication required area for the organization vremennogo the storage of oxidized ores. In cramped conditions quarries when parallel to solve the problem of minimizing the cost of Stripping vacancy no. Even more difficult situation with the available space for the organization of averaging ore in underground mines.

The closest technical solution is the method of mining and processing of molybdenum-containing ores, including zoning career field, outlining the different technological properties parcels of ore mass, selective dredging on contoured areas with the creation of an independent flow of ore from areas with increased oxidation of molybdenite and directing it to a fluorescent separation (Akulov Century A. "the Rationale for step-by-step adaptation of the combined development of mountainous fields to changing mining and technological conditions." The dissertation on competition of a scientific degree of the doctor of technical Sciences, Novocherkassk, 2009, http://oldvak.ed.gov.ru/common/img/uploaded/files/vak/announcements/techn/2009/13-04/KHakulovVA.pdf).

This solution, considered as a prototype, focused on additional extraction of useful components from low quality ores and effectively when receiving relatively small amounts of pomalidomide products, which can be raschitivat with a large amount of sulfide ores. If in the end the oxidation mol is Benita grades will exceed 10-11%, the inevitable large losses when molybdenum flotation enrichment, at the stage of finishing a rough concentrate. In addition, given that directly with the separation of molybdenite is removed, and on luminescence of powellite solves the problem of the extraction of enriched product pieces with a high content of molybdenum. These can be pieces with a high content of powellite and pieces with a high content of molybdenite, covered with the oxide film powellite. It should be noted that the pieces containing molybdenite, not covered with the oxide film, not lumines cent and in the enriched product with separation do not stand out and are lost in the tail product. Since this solution involves the sort of low quality ores, then further processing of tailings separation was not provided. Therefore this technical solution due to the significant loss of molybdenite in the tails of separation does not apply to the carrying molybdenum ores with increased oxidation of molybdenite.

The objective of the invention is to increase the level and quality of extraction of molybdenum in the final product of the balance molybdenum ores with a high degree of oxidation of molybdenite.

The task is solved in that enriched powellton product separation after grinding is directed to collective flotation with obtaining the coarse molybdenum concentrate, after oxidation of the molybdenite in the rough concentrate carry out the leaching of powellite in the environment of a melt of a mixture of chloride and sodium silicate with the formation of saturated sodium molybdate melt of sodium chloride and tails in the solid residue, and the tail separated product is sent after grinding on flotation with obtaining molybdenum concentrate.

Examples of specific performance

The largest in Russia Tyrnyauz wolframate field presents more than 30 of the ore bodies, which differ mineral, material composition, determining their technological properties. A large part of the ore bodies are ores containing as tungsten and molybdenum. In addition, some ore bodies are monocomponent ores, which contain only one useful component (tungsten or molybdenum).

The main mineral that represents molybdenum ores in Tyrnyauz wolframalpha field is molybdenite (MoS2). Molybdenite has a higher hydrophobicity than the associated minerals, and so well-oated. Despite the extremely low content of molybdenum in a significant part of the ore blocks (0.030-0,06%) of its recovery into the concentrate reaches 95%. At the same time separate sites reservoir is exposed to various degrees of OK is comprehension. This is manifested in the coating of molybdenum oxide film powellite (Samoa4). The performance of the existing technology of enrichment by oxidation of molybdenite in excess of 10%, significantly worse. Of tungsten-molybdenum ore powellite extracted with scheelite in bulk concentrate and is divided into stage hydrometallurgy.

Most problems occur at the stage of finishing the rough concentrates during the concentration of the oxidized monasteraden molybdenum ores. The presence of calcium minerals in the ore it difficult to obtain rich powelltown concentrates. On existing technology this problem is solved by averaging ores supplied by a single thread on a single production line, in which Pavelic was extracted with scheelite in bulk concentrate and is divided into stage hydrometallurgy. But this technology, in addition to other drawbacks, does not solve the problem of pure molybdenum ores as averaging them with delicatissima ores leads to mutual dilution and reduction in the efficiency of processing.

The drawing is a flow diagram of a variant of the practical implementation of the proposed technical solution.

At the stage of mining operations using the technology of selective extraction by the formation of the two threads of the rock mass.

The technology of selective viem and includes a preliminary zoning career fields, delineation of different technological properties parcels of ore mass (including the oxidation of molybdenite). Selective excavation, on contoured areas, isolated in the first independent flow of ore mass of the zones in which the oxidation of molybdenite not exceed 9-11%. The second stream emit the most oxidized molybdenum ore zone violations, where the oxidation of molybdenite is about 20%. Ore the first stream is processed by known techniques involving crushing, grinding, flotation getting molybdenum concentrate. Extraction of molybdenum on this technology in the processing of weakly oxidized ores is more than 91%.

Ore second thread undergo crushing and screening on the two products. The oversize of the size - 75 +10 mm is subjected to fluorescent separation. In x-ray or ultraviolet rays of the pieces containing oxidized molybdenite (covered with a film of powellite), lumines cent and are enriched in the product. Tails separation, is a purified from powellite product with conditioned content of molybdenite (the content of Mo and the degree of oxidation), combined with a stream of weakly oxidized ore grinding stage (i.e. after grinding is sent to flotation getting molybdenum concentrate).

The enriched product is apararii, high oxidation state (90%), combined with the undersize particles size -10 mm, which is approximately 1.5 times enriched in molybdenum compared to the original ore mass and high oxidation of molybdenite (70%). The combined product after grinding, the collective flotation to obtain a rough concentrate content of about 4.5-11% Mo undergo the process of oxidation of molybdenite. There are a large number of technologies oxidation of sulfide concentrates.

Most common in the industry got two technologies oxidation using firing [6]:

- the technology of firing in multiple-hearth furnaces with mechanical perekryvaniem;

- the technology of firing in fluidized bed furnaces.

The technology of firing in multiple-hearth furnaces with mechanical perekryvaniem long used for the roasting of sulfide concentrates.

In this way molybdenum disulfide, molybdenum contained in the concentrate is subjected to oxidative roasting in multiple-hearth furnaces at 480-590°C.

The oxidation reaction (2MoS2+7O2-> Moo3+4SO2) on the pods when the mixing is accompanied by heat. Heating is only required when running the furnace. The temperature should not exceed 580-590°C. Calcite in contact with particles of Moo3goes in Samoa4. The excessive presence of the mixture of calcite causes the formation during roasting calcium sulphate: caso 3+SO3-> CaSO4+CO2.

Roasting in a fluidized bed is used in the chemical and metallurgical industries. The performance of this technology in 15-20 times higher than in conventional kilns. The calcined particles of the material are in the upward gas flow in the "boiling" or "pseudogigas" state. In this state the granular material passes when the critical velocity of the upward flow of gas. The layer of material extends and then goes into pseudoregma condition characterized by intense motion of particles in the flow, in appearance resembling a boiling liquid. Due to the good contact of the particles with gas chemical reactions in a fluidized bed flow quickly. In addition, the mobility layer, similar to the mobility of the fluid, allows for easy continuous spontaneous discharge, "leakage" of material from the furnace through the discharge pipe.

The oxidation product is directed to the leaching of powellite in the environment of a melt of a mixture of chloride and sodium silicate. Powellite dissolved in a melt of sodium chloride, while the contained impurities interact with sodium silicate and precipitate. Rocks that do not interact with the melt mixture of chloride and sodium silicate, also remain in the solid phase and removed from the process after removal of the melt is saturated with the CSOs sodium molybdate. After adding calcium chloride to melt saturated with sodium molybdate formed artificial powellite, which precipitates, and the sodium chloride is removed from the process. In the processing of oxidized ore is brought to obtain molybdenum product further profitable hydrometallurgical processing, and the sodium chloride is returned to the leaching process powellite.

The proposed technology is effective in the extraction of the oxidized molybdenum ores. The technology provides for the selection in the process of selective extraction rebellious part of deposits presented oxidized ores, which allows you to select (via a lumpy sort) and send paolitagenial part of the ore stream processing technology, providing fine-tuning of the coarse molybdenum concentrate process is not critical to powellite - leaching powellite in the environment of a melt of a mixture of chloride and sodium silicate. Technology allows them to raise the quality and the extraction of molybdenum in concentrate.

Sources of information

1. The mineralogical-technological mapping of ores of various parts of the Tyrnyauz field with the aim of developing methods of quality control of ore. Volume I. Report on the research. - L.: Mekhanobr, 1980.

2. Novikov Century. Century. and other non-traditional technology of ore deposits. - pogashenie ores, No. 3, 4, 1992, S. 4-12.

3. Kamkin, I. R., Akulov Century And, Bakharev L. C., Subetto O. K., Mollai R. C. Technology for pre-enrichment of ores by the method of x-ray separation Gorn. - 1990. No. 9. - S. 26-27.

4. A. S. No. 1503401 (USSR). Akulov C. A., Zhaboev M,N, Pancakes Y. I., Khrushchev C. A., Semechkin, A., Kagarmanov S. A. Method of forming quality ores. - 1989.

5. Akulov Century And the Rationale for step-by-step adaptation of the combined development of mountainous fields to changing mining and technological conditions, the dissertation on competition of a scientific degree of the doctor of technical Sciences, Novocherkassk, 2009, http://oldvak.ed.gov.ru/common/img/uploaded/files/vak/announcements/techn/2009/13-04/KHakulovVA.pdf

6. Oxidative roasting of molybdenum concentrates http://./publ/analitika_rynka_chjornykh_metallov/okislitelnyj_obzhig_molibdenitovykh_koncentratov/2-1-0-33

The method of mining and processing of molybdenum-containing ores, including zoning career field, outlining the different technological properties parcels of ore mass, selective dredging on contoured areas with the creation of an independent flow of ore from areas with increased oxidation of molybdenite and directing it to a fluorescent separation, characterized in that the enriched powellton product separation after grinding is directed to a collective flotation getting rough molybdenum concentrate, next pic is e oxidation of molybdenite in the rough concentrate carry out the leaching of powellite in the environment of a melt of a mixture of chloride and sodium silicate, and the tail separated product is sent after grinding on flotation with obtaining molybdenum concentrate.



 

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