Leaching method capable of reducing leached acid consumption of uranium ores

A uranium ore and leaching technology is applied in the field of leaching to reduce the acid consumption of uranium ore leaching, and can solve the problems of increasing the ore processing cost, increasing the ore processing process in the beneficiation method, and the loss of uranium metal, so as to reduce the leaching rate, reduce the processing cost, The effect of reducing acid consumption in ore leaching

Active Publication Date: 2012-06-27
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND 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 includes the following steps:

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

[0022] (2) Acidizing period: the above-mentioned uranium ore is leached with sulfuric acid solution, the concentration of sulfuric acid is 10g / L, and the sulfuric acid solution is continuously sprayed, and the spray intensity is 30L / (m 2 .h), the spray 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. The sulfuric acid concentration in the mixed solution is 8 g / L, and the amount of polyferric aluminum sulfate added is controlled to make Fe in the mixed solution. 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 intermittently, spraying for 7 hours a day, spraying for 40 days, and the spraying intensity...

Embodiment 2

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

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

[0029] (2) Acidizing period: the above-mentioned uranium ore is leached with sulfuric acid solution, the concentration of sulfuric acid is 11.0g / L, and the sulfuric acid solution is continuously sprayed, and the spray intensity is 50L / (m 2 .h), the spray 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. The sulfuric acid concentration in the mixed solution is 10 g / L, and the amount of polyferric aluminum sulfate added is controlled to make Fe in the mixed solution. 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 intermittently, sprayed for 5 hours a day, sprayed for 20 days, and the spray intensity i...

Embodiment 3

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

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

[0035] (2) Acidizing period: the above-mentioned uranium ore is leached with sulfuric acid solution, the concentration of sulfuric acid is 11g / L, and the sulfuric acid solution is continuously sprayed, and the spray intensity is 20L / (m 2 .h), the spray time is 20 days;

[0036] (3) In the early stage of leaching: prepare a mixed solution of sulfuric acid and polyaluminum ferric sulfate as a leaching agent. The concentration of sulfuric acid in the mixed solution is 5g / L. 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 intermittently, spraying for 10h every day, spraying for 50 days, spraying intensity 35L / (m 2 .h); The adopted polyferric aluminum sulfate raw material component satisfies Fe 3+ The conc...

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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 a uranium ore hydrometallurgical technology, in particular to a leaching method for reducing the acid consumption of uranium ore leaching. Background technique [0002] In the acid leaching process of uranium ore, only a small amount of sulfuric acid is consumed by uranium minerals, and most of the sulfuric acid is consumed in combination with impurities (such as bauxite, iron oxides, calcium and magnesium oxides, carbonates, etc.) and other non-target minerals. 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 their dissolution rate is the main way to reduce the acid consumption of uranium ore leaching. [0003] Existing common methods include ore pretreatment (ore dressing), low acid and high flux leaching. [0004] Ore beneficiation, that is, through radioactive beneficiation, gravity separation, or other physical ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B3/08C22B60/02
Inventor李建华邓锦勋程威曾毅君吴会玲李红
OwnerBEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY