The method of extraction of uranium from ores

 

(57) Abstract:

The invention relates to the hydrometallurgical processing of uranium raw materials. The method allows to increase the performance of the sorption process, to reduce the specific consumption of the ion exchange material and to increase the extraction of uranium from ore. Uranium ore is subjected to grinding and wet grinding with obtaining dense slurries. Conduct leaching and sorption of them uranium by ion exchange with the conclusion of the pulp saturated resin. Washed with water, was stripped uranium, washed accesorising the ion exchanger from excessive acidity and enter the regenerated ion exchanger on the sorption of uranium. Perform gravity classification saturated, water-washed or regenerated sorbent, combined with a shop transportation of the resin due to his move on the inclined section of the transport route and selection of enriched ore particles of sand ionite mixture from the lower zone of the moving stream, with subsequent usadkoy it Sands and their withdrawal from the hydrometallurgical process. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of hydrometallurgical processing uraniastrasse raw materials and can be COI is consumption and wet grinding with obtaining dense slurries, leaching, multistage separation and leaching leached Sands with the use of classifiers and hydrocyclones, sorption of uranium from the obtained slurry effluents by ion exchange, the conclusion from the pulp saturated ion exchange resin, washing with water, desorption of uranium and enter accesorising of the resin on the sorption of uranium (Zefirov, A. P. and other Plants for uranium ore processing in the capitalist countries. - M.: gosatomizdat, 1962, S. 32-42).

Significant disadvantages of this technology are significant expenses megolomaniac allocation and washing the leached Sands, low extraction of valuable components from the solid phase.

The closest adopted for the prototype is a method of extracting uranium from ore comprising grinding and wet grinding with obtaining dense slurries, leaching and sorption of them uranium by ion exchange, the conclusion from the pulp saturated ion exchange resin, washing with water, desorption of uranium, washing desorbed from the ion exchanger from excessive acidity and enter regenerated ion exchanger on the sorption of uranium (Gromov B. C. Introduction to chemical technology of uranium. M: Atomizdat, 1978, S. 146-147).

The disadvantages of this method include increased loss of uranium and the ion exchanger ESerbia, ore particles of sand fractions. Fineness of grinding of raw materials intended for leaching with subsequent sorption valuable component of dense slurries, as a rule, does not exceed 0.2-0.4 mm (up to 99.5% by weight of the processed ore). In suspensions, directed with redistribution grinding on the leaching and sorption, content of ore particles greater than the grain size of 0.4-0.6 mm reaches 0.1-0.3% of that in terms of their long-term abrasion in devices, primarily in Aerolift, and cell size of drainage grids in sorption Pachuca, typically, 0.4-0.6 mm, leads to the concentration of sand in the ion exchanger. Washing the resin with water, even in vysokoeffektivnykh apparatuses of the type of pulse columns does not allow to extract the Sands. Practically water-washing of the resin provides only a fairly complete deletion of silt and sludge.

Circulating together with the flow of the resin sand fractions firm responsible for the reduced performance of the sorption redistribution, intensify the process of deterioration of the resin and, ultimately, lead to increased losses of ion exchanger and uranium discharged from the pulp.

The technical result of the invention is to increase the performance of the sorption process, sacramentality is achieved by the extraction of uranium from ores carry out a method comprising grinding and wet grinding with obtaining dense slurries, leaching and sorption of them uranium by ion exchange, the conclusion from the pulp saturated ion exchange resin, washing with water, desorption of uranium, washing accesorising ion exchanger from excessive acidity and enter regenerated ion exchanger on the sorption of uranium, characterized in that extracted from the pulp of the ion exchanger, rich, water-washed or regenerated, is subjected to gravitational classification emitting enriched ore particles of sand ionite mixture and usadkoy of her Sands, this gravitational classification is combined with a shop transportation of the resin by moving it along an inclined section of the thoroughfare, and the allocation of enriched ore particles sand-Jonynas mixture from the lower zone of the moving stream.

In the proposed method, gravity classification of material is carried out while moving the ion exchanger on the inclined descending or ascending stretch of highway, and in the latter case, use Aerolift system. In roaming the flow of the resin material is distributed according to the size and weight, while in the lower zone of the material along the height of the thread regulate the output and the content of sand in the mixture directed to tsadka. Thus, the proposed technology operations are combined transport of ion exchanger and gravitational discharge from it enriched ore particles of sand ionite mixture, eliminating the need of using any additional devices. Usadkoy of sand-ionite mixture allocate Sands, which are removed from the process. The second product of this activity is cleared from the ore particles, the ion exchanger. In the case of filing by a gravity classification and tsadka washed with saturated ion exchanger him after extraction of sand sent to desorption. When processing for this technology regenerated ion exchanger latest sent in the pulp - on the sorption of uranium. The analysis of the content of sand in the ion exchanger selected from the hydrometallurgical process, showed that the circulating flow Ionia content of sand washed in saturated and the regenerated ion exchanger is virtually identical, allowing you to use them identical technology gravity processing.

The following are examples of conduct processes for recovering uranium from ores on the proposed technology in comparison with the known method.

e containing uranium breeds were represented trachydacite, andesite-basalts, felsite, conglomerates and granites; minerals valuable component pitchblende, coffinite, uranium black, brannerite, uranophane and urination. The technological chain of pretreatment, which includes ore crushing on SDP-h, wet grinding using grinding mills MMS h and MSC h, classifiers 2-STS-24, hydrocyclones HZ-500 and thickeners P-50, produces pulp density 1370-1390 g/l, Tonini grinding solid 95-96% class 0,1 mm Leaching of uranium from the pulp was carried out with sulfuric acid at a pH of 2.2-2.4 in six series connected agitators in the presence of manganese dioxide dosing to AFP 480-520 mV. The sorption of uranium spent ten machines of the type pacuk counterflow movement of the resin and pulp. The content of the ion exchanger in the apparatus was maintained in the range of 9-10% by volume. Saturated with uranium to 30 g/l of the resin taken out from the head along the pulp Pachuca sorption, washed with water in a column apparatus and sent to the desorption, was last sulfuric-nitric acid solutions. The output of the eluates was 2.3-2.5 volume on the volume of the resin. Accesorising the ion exchanger was washed with water from excess acidity, while the transfer of resin from the AI.

For testing the proposed method in the technology of extraction of uranium from ore raw material changes have been made. Regenerated the resin was subjected to gravitational classification, which was carried out on sloping downward stretch of highway, in particular in the supply line of airlift pumping regenerated ion exchanger in the rear of the apparatus sorption. Enriched ore particles of sand ionite mixture taken out from the lower zone of the moving stream of ion exchanger and sent to jigging machine MOD to 0.2. Usadkoy on the 5 mm sieve bed of the ore material and the mixture was divided into two products. Sands - underflow - representing the leached solid phase of the processed material were taken from the hydrometallurgical process; ion exchanger - the oversize of the jigging was sent to the tail of pacuk sorption.

The performance of the considered schemes shown in the drawing. These data indicate that enriched Sands product gravitational classification concentration increased 3.7 times compared to the original content in the resin. The sand content in the circulating system sorption-desorption flow of the resin during the daily cycle is the gravitational treating saturated, washed by the water of the resin. In the continuous mode of operation of the installation gravitational processing results in almost complete removal of sand from the circulating flow of the resin was achieved within 1.5 months. Further, when intermittent operation of the considered node, the content of sand in the ion exchanger was maintained not more than 1%. The duration of each stage of testing on known and proposed technologies was 3 months.

By comparing these figures, it was found that the use of the proposed method with gravity processing please flow of the resin, a selection from it enriched ore particles of sand ionite mixture and usadkoy of her Sands, compared with the known method allowed:

- to reduce the specific consumption of the ion exchange resin from 75 to 65 g/kg extractable metal,

- to increase the performance of the sorption process from 3.0 to 3.4 tonnes of uranium on m3the ion exchanger used in the process;

to increase the extraction of uranium from ore decorate with 92,7 to 93,2%.

In General the presented data show that the proposed method is compared with the known provides a more effective management of the hydrometallurgical process to extract uranium from which the shaft pulps, leaching and sorption of them uranium by ion exchange, the conclusion from the pulp saturated ion exchange resin, washing with water, desorption of uranium, washing accesorising ion exchanger from excessive acidity and enter regenerated ion exchanger on the sorption of uranium, characterized in that extracted from the pulp of the resin - saturated, water-washed or regenerated is subjected to gravitational classification emitting enriched ore particles of sand ionite mixture and usadkoy of her Sands.

2. The method according to p. 1, characterized in that the gravitational classification is combined with a shop transportation of the resin by moving it along an inclined section of the thoroughfare, and the allocation of enriched ore particles of sand ionite mixture from the lower zone of the moving stream.

 

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