The method of extracting uranium from ore materials

 

(57) Abstract:

The invention can be used to extract uranium heap methods or underground leaching. The method consists in processing the ore material with a solution of sulfuric acid. In the sulfuric acid solution is additionally injected lignosulfonate ammonium, alkali or alkaline-earth metal. The concentration of lignosulfonate in the leaching solution of 0.05-5.0 g/l Method allows to reduce the duration of the leaching process, reduce the consumption of acid, to reduce the amount of productive solutions. 1 C.p. f-crystals, 2 Il.

The invention relates to a hydrometallurgical methods of ore processing and can be used to extract uranium from ore materials by means of heap (KV) and underground (PV) leaching.

There is a method of leaching of uranium from ores methods PV and CV using sulfuric acid, the essence of which is to infiltration of dilute its solutions through a layer of ore stacked in a heap, either directly through the ore-bearing stratum /Lunev L. I. Mine system development of deposits of uranium underground leaching, M.: Energoizdat. 1982, page 8, 13/. The disadvantage of this method videocelebrity, large volume production solutions, subject to subsequent processing.

A method of extracting uranium heap or underground leaching, including the processing of ore with a solution of sulfuric acid; sulfuric acid impose additional lignosulfonate ammonium, alkali or alkaline-earth metals (lignin). The concentration of lignosulfonate in the leaching solution support in the range of 0.05 to 5.0 g/L.

The essence of the method consists in the following. Ore to be processed by heap method, warehoused in a heap, soaked by the splashing water, then zachisliaut by similar spraying a diluted solution of sulfuric acid and then treated in the same way dilute solution of sulfuric acid, which introduced the addition of lignosulfonate concentration required. Irrigation of the heap carry out evenly as long as the flow from under the heap final solution the uranium content will be reduced to a few mg/L. then leached ore from the heap discharged into a dump, and production solution sent for processing in a known manner.

In the case of PV, the process of leaching is performed by the same procedure, but rastad of otkachnoj well and sent for recycling.

In laboratory conditions it is carried out in columns by similar methods.

In Fig. 1 and 2 presents the results of the leaching of uranium from the ore heap and underground, respectively, with the addition of lignosulfonate in comparison with the results of leaching by sulphuric acid solutions without such additives.

Example 1 (KV option).

500 g of crushed to minus 10 mm (100%) uranium ore with a uranium content of 0.23% placed in a column with a diameter of 35 mm and in drip mode with a speed of 25-50 ml per day is irrigated first with a solution of sulfuric acid 100 g/l until the output from the column of solution of the free acid ("acidification" ore), then the solution of H2SO425 g/l with the addition of 1.0 g/l of ammonium lignosulfonate technical (lsls), the oxidant is oxygen. Daily carry out sampling of production of the solution and its analysis on the uranium content, pH, redox potential (VP). The leaching process is continued up until the uranium content in the final solutions will be reduced to a few mg/L. the Total duration of the experience was 50-55 days. The results of the experiments leaching the ore with a solution of sulfuric acid and the same solution, but with dobi solution can achieve a higher degree of extraction of uranium (5-6%) (branch BS curve) or in 2-2,5 times to reduce the duration of the leaching process at the same degree of extraction of uranium, therefore, to reduce the consumption of reagents and reduce the watering process.

Example 2 (option PV).

300 g of core samples of the ore paleodrainage type uranium content 0,215% is placed in a column with a diameter of 35 mm, then the column is filled with a solution containing 2-3 g/l of sulfuric acid, and in continuous mode with a speed of 60-90 ml/day pass this solution by the method of seepage through the layer of ore until the output from the column of solution with a free acid. After the "acidification" of the ore in the leaching solution is injected lsls from the calculation of its concentration equal to 0.15 g/l, and continue to leach down to reduce the concentration of uranium in the production solutions to several mg/l For comparison in the same column leaching of the ore was carried out in a similar solution of sulfuric acid, but without additives lsls. The results of the experiments are shown in Fig. 2.

The data show that the additive lsls lead to a significant increase in the degree of extraction of uranium by 8-10%.

Assuming the estimate is the degree of extraction, the duration of leaching (or the ratio of W:T) of ore with a solution of sulfuric acid with the addition of LST in comparison with the leaching solution one of sulfuric acid sucrase volume solutions subject to further processing.

Thus, the use of additives lsls in sulfate solutions at HF and MF uranium from ores dramatically intensify the process while its simplification and cost reduction.

1. The method of extracting uranium from ore materials heap or underground leaching, including the processing of ore with a solution of sulfuric acid, characterized in that the sulfuric acid solution is additionally injected lignosulfonate ammonium, alkali or alkaline-earth metal.

2. The method according to p. 1, characterized in that the concentration of lignosulfonate support in the range of 0.05 to 5.0 g/L.

 

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