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Leaching method capable of reducing leached acid consumption of uranium ores

A uranium ore and leaching technology, applied in the field of leaching to reduce the acid consumption of uranium ore leaching, can solve the problems of uranium metal loss, increase the ore treatment process in the beneficiation method, and increase the cost of ore treatment, so as to reduce the treatment cost, reduce the dissolution rate, Effect of reducing acid consumption in ore leaching

Active Publication Date: 2011-04-20
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The beneficiation method increases the process of ore treatment, which will increase the cost of ore treatment
On the other hand, beneficiation produces a certain proportion of tailings, which also contain lower grade uranium, resulting in the loss of uranium metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A certain uranium ore is leached by heap leaching, and the method comprises the following steps:

[0021] (1) Pretreatment of uranium ore: crushing uranium ore to -10mm;

[0022] (2) Acidification period: use sulfuric acid solution to leach the above-mentioned uranium ore, the sulfuric acid concentration is 10g / L, continuously spray sulfuric acid solution, and the spraying intensity is 30L / (m 2 .h), the spraying time is 10 days;

[0023] (3) In the early stage of leaching: prepare a mixed solution of sulfuric acid and polyferric aluminum sulfate as a leaching agent. 3+ The concentration is 5g / L, Al 3+ The concentration is 0.5g / L; the mixed solution of sulfuric acid and polyferric aluminum sulfate is sprayed in gaps, sprayed for 7 hours a day, sprayed for 40 days, and the spray intensity is 40L / (m 2 .h); The raw material components of polyferric aluminum sulfate used meet the requirements of Fe 3+ The concentration is 150g / L, Al 3+ The concentration is 10.0g / L;

[...

Embodiment 2

[0027] A certain uranium ore is leached by heap leaching, and the method comprises the following steps:

[0028] (1) Pretreatment of uranium ore: crushing uranium ore to -5mm;

[0029] (2) Acidification period: the above-mentioned uranium ore is leached with sulfuric acid solution, the concentration of sulfuric acid is 11.0g / L, the sulfuric acid solution is continuously sprayed, and the spray intensity is 50L / (m 2 .h), the spraying time is 5 days;

[0030] (3) In the early stage of leaching: prepare a mixed solution of sulfuric acid and polyferric aluminum sulfate as a leaching agent. 3+ The concentration is 8.0g / L, Al 3+ The concentration is 0.8g / L; the mixed solution of sulfuric acid and polyferric aluminum sulfate is sprayed in gaps, sprayed for 5 hours a day, sprayed for 20 days, and the spray intensity is 35L / (m 2 .h); The raw material components of polyferric aluminum sulfate used meet the requirements of Fe 3+ The concentration is 160g / L, Al 3+ The concentration is...

Embodiment 3

[0033] A certain uranium ore is leached by heap leaching, and the method comprises the following steps:

[0034] (1) Pretreatment of uranium ore: crushing uranium ore to -20mm;

[0035] (2) Acidification period: use sulfuric acid solution to leach the above-mentioned uranium ore, the sulfuric acid concentration is 11g / L, continuously spray sulfuric acid solution, and the spray intensity is 20L / (m 2 .h), the spraying time is 20 days;

[0036] (3) In the early stage of leaching: prepare a mixed solution of sulfuric acid and polyferric aluminum sulfate as a leaching agent. 3+ The concentration is 3.0g / L, Al 3+ The concentration is 0.2g / L; the mixed solution of sulfuric acid and polyferric aluminum sulfate is sprayed in gaps, sprayed for 10 hours a day, sprayed for 50 days, and the spray intensity is 35L / (m 2 .h); The raw material components of polyferric aluminum sulfate used meet the requirements of Fe 3+ The concentration is 130g / L, Al 3+ The concentration is 5.0g / L;

[0...

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Abstract

The invention provides a leaching method capable of reducing leached acid consumption of uranium ores, which comprises the following steps: leaching uranium ores by using the mixed solution of sulfuric acid and polyferric sulfate aluminium as the leaching agent, wherein if adopting an agitation leaching mode, the amount of the sulfuric acid in the mixed solution is 6-12% by mass of uranium ores, the amount of the polyferric sulfate aluminium is 0.3-0.7% by mass of uranium ores, and the mass proportion (liquid to solid ratio) of the leaching agent to the uranium ores is (1-2):1; and if adopting a heap leaching mode, the concentration of the sulfuric acid in the mixed solution is 5-10 g / L, and the amount of the polyferric sulfate aluminium is controlled, so that the concentration of Fe<3+> in the mixed solution is 3.0-8.0 g / L, and the concentration of Al<3+> is 0.2-0.8 g / L. On the premise of not affecting the leaching of uranium ores, the polyferric sulfate aluminium selectively inhibits the principal acid-consuming elements and the reaction of sulfuric acid, lowers the leaching rate and reduces the leached acid consumption of ores, thereby lowering the processing cost for uranium ore heap leaching.

Description

technical field [0001] The invention relates to uranium ore hydrometallurgy technology, in particular to a leaching method for reducing acid consumption in uranium ore leaching. Background technique [0002] In the acid leaching process of uranium ore, uranium minerals only consume a small amount of sulfuric acid, and most of the sulfuric acid is consumed in the contact with non-target minerals such as bauxite, iron oxide, calcium magnesium oxide and carbonate, etc. In terms of reaction, how to inhibit the reaction of the main acid-consuming elements ferrous, ferric, aluminum, calcium, magnesium and sulfuric acid, and reduce its dissolution rate is the main way to reduce the acid consumption of uranium ore leaching. [0003] Existing common methods include ore pretreatment (mineral processing), low-acid high-flux leaching. [0004] Mineral beneficiation, that is, to effectively screen out gangue minerals in uranium ore, especially the main acid-consuming minerals, through r...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B60/02
Inventor 李建华邓锦勋程威曾毅君吴会玲李红
Owner BEIJING RES INST OF CHEM ENG & METALLURGY
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