The method of dissection of uranium ores

 

(57) Abstract:

The method can be used for hydrometallurgical processing of uranium ore. Uranium ore is subjected to crushing and wet crushing of obtaining pulp, which is divided into two streams. One of them, amounting to 35-70% of the total mass of the processed raw material is subjected to acid treatment at a pH of 2.0 to 4.2 leaching of iron, then streams are combined and the oxygen in the air oxidizes extracted into a solution of iron, and then to convert uranium into solution in the combined slurry is injected acid and additional to ore iron oxidants connection Mn (IV) and/or Fe (III) maintaining the pH of the leached slurry of 1.5 to 2.5. The method allows to reduce the cost of extracting uranium from ores by reducing the cost of reagents. 1 C. p. F.-ly, 1 Il., 3 table.

The invention relates to the field of hydrometallurgical processing uraniastrasse raw materials and can be used in acid campaign showdown ores.

The known method of dissection of uranium ores, including crushing, wet grinding with obtaining pulp and acid leaching in the presence of manganese dioxide in the region of pH 2,2 - 4,2 (RF patent N 2094512, SS="ptx2">

The closest adopted for the prototype is a way of hydrometallurgical processing of ores, comprising grinding the raw material, wet grinding with obtaining pulp, divide it into two parts in a weight ratio of 20 to 50:50 to 80, the leaching of iron in lesser one at a pH of 1.5 to 2.5 for 1-4 hours, the mixture acidic, and the initial suspension, the oxidation of iron in the combined weight of the pulp with oxygen of air, followed by acid translation of valuable components (such as uranium) in solution (USSR author's certificate N 793942 from 19.02.1979).

The disadvantages of this known method is a significant consumption of sulphuric acid and low efficiency of use contained in the ore of iron. The first is due to the fact that the translation of uranium in solution in this technology, with the use of leached and oxidized ore of iron, is possible only at high acidity of the liquid phase of the slurry 10 - 40 g/DM3(pH of 1.2 to 0.6).

An increase in pH of the leaching of uranium to values of 1.5 or more, with the aim of reducing the consumption of solvent, leads to a sharp drop of the extract component, that is, this method does not effectively transfer the uranium in the solution under reduced consumption of sulfuric acid. Low is similar to the ore pulp into pieces (in continuous mode - on the threads). In General, the cost of processing of raw materials by a known method is very significant.

The method of dissection of uranium ores, including crushing, wet grinding with obtaining pulp, dividing it into two streams, the leaching of iron in one of them, mixing with the second, oxidation of the extracted iron oxygen and acid translation of uranium in solution, characterized in that the proportion of ore in a stream directed to the leaching of iron, is 35-70% of the total mass of the processed material, the opening of the iron is carried out in the field pH of 2.0 to 4.2; and the acid translation of uranium in solution is performed with the input of additional oxidant, which is used, for example, compounds of Mn (IV) or Fe (III) maintaining the pH of the leached slurry in the range of 1.5 to 2.5.

The proposed method allows to reduce unit costs for the opening of uranium ores in their hydrometallurgical processing. The technical result of the invention is achieved by providing the necessary parameters divide the source of the ore pulp flows and the opening of the iron in one of them, as well as the introduction on the stage leaching of uranium "external" with respect to iron ore oxidizer and their joint work on the translation zendog is of pulp flows and settings opening the iron in one of them as a test of technology for the preparation of ore oxidizer is considered the specific extraction of iron in solution. This indicator takes into account the correlation of flows of raw materials and parameters of the opening of iron, it is objectively reflects the quantitative level of the ore developer used to extract uranium. Based on this determined that most effectively be directed to the leaching of iron from 35 to 70% recycled raw materials and to carry out the acid treatment of this material in the boundary conditions of a pH of 2.0 to 4.2, i.e. the preparation of the oxidizing agent can effectively be carried out by acid treatment as smaller fraction of ore (35%) and most (70%) relative to the total mass of the processed material. Boundary values of the ratio of threads in this case are 35-70:65-30.

The opening of the iron is carried out for 1-2 hours, then streams are acidic and the original pulp unite. Oxidation of iron is extracted oxygen. On the translation stage of uranium in solution is injected additional oxidant (oxidant), for example compounds of Mn (IV), Fe (III), which together with iron ore provides a fairly complete extraction of uranium under reduced solvent consumption in the region of pH 1.5 to 2.5. Temperature processing of raw materials for each of the above stages allow the process at 40-80age opening of uranium ore provides the conditions combining sufficient completeness of extraction of valuable components in a solution with a low cost solvent and oxidant and, accordingly, the minimum specific fuel consumption for this hydrometallurgical operations.

The following are examples of conduct processes of opening of uranium ore on the proposed technology in comparison with the known method.

For laboratory experiments was composed of the ore charge aluminosilicate type, in which the containing uranium breeds were represented trachydacite, felsite, conglomerates, undesirability and granites; minerals of uranium pitchblende, coffinite, brannerite, uranium black, uranophane, urination and autunite, iron minerals - magnetite, hematite, goethite and, to a minor extent, by jarosite and pyrite; carbonates consisted chiefly of calcite and magnesite, dolomite, siderite and ankerite.

The content in the charge amounted, %: uranium is 0.260; SiO266,6; Al2O313,8; Fetotal4,0; CO32-2,5; P2O50,3; Stotal0,2, etc.

In the experiments used the ore pulp source density 1.3 kg/m3, fineness of grind solid was - 0,1 mm Heating of the suspension was carried out with the s carried out with compressed air.

In each of the experiments the original pulp was divided into two parts in different ratio. The opening of iron was carried out for 1.5 hours, then sour and the original suspension was combined and carried out the oxidation of extracted into a solution of Fe (II) to a residual content in the liquid phase is less than 0.1 g/DM3, further translation of uranium in solution in the slurry was injected acid and additional oxidant (oxidant), the processing time of the pulp in this operation was two hours. To assess the recovery of valuable component in washed cakes leaching analyzed the residual uranium content. Table 1 presents the results of a process by a known method from the leaching of iron from the small part of the material used (40-30%) at a pH of 2.4 to 1.5 and the proposed method - the proportion of ore sent to the leaching of iron, was 60%, pH of the treatment - 3,6.

Presented tabular data shows that unit costs in the known method, when the pH of the leaching of uranium 0,7-1,0 6,7-6,0$./kg, increase the final pH to 1.8 led to the fall of extraction of valuable components and thus to increase the unit cost to 8.2$./kg In the proposed method, with the transfer of uranium in solution at a pH of 1.0 unit cost is different for iron ore oxidants helped to reduce unit costs to 5.4 - 5,2 $ /kg Thus, the proposed technology compared with the known reduces the cost of uranium 0.6 - 0.8 us $ /kg

Subsequent data are presented to justify the boundary values of the processing parameters of raw materials on the proposed method of dissection of uranium ores.

Graphic dependencies shown in the drawing, show that with increasing pH of the leaching of iron from 0.5 to 5.0 concentration in solution at this stage of processing naturally decreases (curve 1), at the same time, the share of ore from which the metal leached, in relation to the total weight of the feedstock increases (curve 2). The resulting dependence (curve 3) shows that the effective management of the process, providing specific extraction of iron in the solution over 5 kg/t, is achieved in the region of pH 2.0 to 4.2, and when acid treatment 35-70% of the material of the total weight of the feedstock.

Table 2 examines the influence of parameters dividing the raw ore and the pH of the opening of iron on the leaching of uranium. The data show that unit costs 5,7 $ /kg or less are provided by the division of ore flows similar to the optimal region specific extract obrabatyvaemoi on this operation, 50-60%.

Table 3 shows data on the impact on process performance parameters of the final stage of processing raw materials.

In all experiments on leaching of iron gave 60% of the original raw material, the pH of the opening was 3.6. After the unification of the leached and the original pulp and oxidation of Fe (II) was carried out by input of sulfuric acid and an oxidizing agent in various quantities. As can be seen from the presented data, the minimum costs of uranium in solution 5,4-5,6 $ /kg is achieved at the final pH of the treatment slurry of 1.5-2.5.

In General, the results show that the proposed method is compared with the known allows to reduce costs for the opening of uranium ores in the hydrometallurgical processing of raw materials.

1. The method of dissection of uranium ores, including crushing, wet grinding with obtaining pulp, dividing it into two streams, the leaching of iron in one of them, mixing with the second, oxidation of the extracted iron oxygen and acid translation of uranium in solution, characterized in that the proportion of ore in a stream directed to the leaching of iron, is 35-70% of the total mass of the processed material, and leaching of iron is carried out in the field pH of 2.0 to 4.2.

2. The way PG gland oxidant, for example, compounds of Mn (IV) and/or Fe (III) maintaining the pH of the leached pulp is 1.5 to 2.5.

 

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SUBSTANCE: invention relates to reprocessing of metal sulfide-containing ores, products and waste of ore concentrating and metallurgy industry. Method includes leaching in sulfuric acid solution with concentration of 1.8-35 g/dm3 at 0-1500C in presence of iron(III) ions with concentration more than 1 g/dm3 and iron regeneration using element compounds having built-in voltage when transition from highest valence to lowest one higher the same of iron. Compounds are added into solution when increasing iron(II) ion concentration. Method is useful in leaching by bawl, percolation, heap, and underground processes, as well as in metal recovering into solution, development of rare and noble metals, impregnated in metal sulfides. Invention affords the ability to reduce power requirement, increase effectiveness of equipment utilization, and decrease reagent consumption.

EFFECT: high degree sulfide decomposition with increased metal recovery and reduced leaching time.

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EFFECT: method for production of high purity metal sulfates without using of additional reagent amount.

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