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Leaching method of black shale uranium vanadium ore

A black shale and vanadium ore technology, applied in the field of uranium ore hydrometallurgy, can solve the problems of high consumption of reagents, excessive iron in vanadium products, high dosage of alkali and reducing agent, etc., to reduce raw material consumption, inhibit iron dissolution, and reduce leaching surplus Effect of Acid Concentration

Pending Publication Date: 2021-03-26
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Too high residual acid concentration and iron concentration in the leaching solution will lead to problems such as excessive alkali and reducing agent consumption in the process of recovering vanadium, and excessive reagent consumption in the wastewater treatment process; when the concentration of iron and iron is too high, even if the reducing agent is used to adjust the potential, the iron With the inevitable accumulation in the organic phase during the extraction-stripping process, it will still cause the vanadium product iron to exceed the standard

Method used

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  • Leaching method of black shale uranium vanadium ore

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Embodiment 1

[0048] A black shale uranium-vanadium ore contains 1.05% vanadium and 0.085% uranium, of which 82% vanadium exists in mica, and uranium mainly exists in the form of adsorption. The black shale uranium vanadium ore is processed by the following steps:

[0049] (1) Ore pretreatment: the ore is ground until the particle size is -60 mesh, adding 20wt% (in raw ore mass) sulfuric acid, 15wt% (in raw ore mass) water, and mixing uniformly;

[0050] (2) Ripening: After the materials are mixed and sealed, heat-preserve and ripen at 90°C for 24 hours.

[0051] (3) Leaching: add water to the material after aging in the above step (2), control the liquid-solid volume mass ratio to 1, and carry out leaching at 96°C, add inhibitor sodium sulfate 1.2wt% during the leaching process, and add calcium hydroxide to adjust the leaching The process pH is 1.66, the dosage of calcium hydroxide is 3.89wt%, and the leaching time is 2h.

[0052] (4) Filtration: the pulp after leaching in the above step...

Embodiment 2

[0058] A black shale uranium-vanadium ore contains 0.946% vanadium and 0.080% uranium, of which 88% vanadium exists in mica, and uranium mainly exists in the form of adsorption. The black shale uranium vanadium ore is processed by the following steps:

[0059] (1) Ore pretreatment: grind the ore until the particle size is -100 mesh, add 12%wt (based on raw ore mass) sulfuric acid, 18%wt (based on raw ore mass) water, and mix well.

[0060] (2) Ripening: After the materials are mixed and sealed, heat-preserve and ripen at 93°C for 2.5 hours.

[0061] (3) Leaching: Add water to the material after aging in the above step (2), control the liquid-solid volume mass ratio to be 1, and carry out leaching at 90°C, add inhibitor sodium sulfate 1.5wt% (calculated as raw ore) during the leaching process, and add Calcium carbonate regulates the pH of the leaching process to be 1.32, the consumption of calcium carbonate is 4.10wt% (based on raw ore), and the leaching time is 1h.

[0062] ...

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Abstract

The invention relates to the technical field of uranium ore hydrometallurgy, in particular to a leaching method of black shale uranium vanadium ore. The leaching method comprises the following steps of crushing and grinding a black shale uranium vanadium ore sample, adding water and sulfuric acid, and uniformly mixing; curing the mixture to obtain a cured material; adding the water or dilute sulfuric acid into the cured material, controlling the volume-to-mass ratio of liquid to solid, adding an iron inhibitor and a neutralizer, adjusting the pH value to 1-3, and carrying out leaching treatment at 80-100 DEG C; enabling the ore pulp obtained after the leaching treatment to be subjected to vacuum filtration, and obtaining leachate and a filter cake; and enabling the filter cake to be subjected to 3-10 sections of countercurrent washing by using the dilute sulfuric acid, and enabling the first section of washing water to be merged into the leachate. According to the method, acid leachingof the black shale type uranium-vanadium ore is achieved, under the condition that the leaching rate of uranium and vanadium is guaranteed, the concentration of residual acid in the leachate is reduced, dissolution of impurity element iron is restrained, and reagent consumption in the subsequent separation and recovery process can be effectively reduced.

Description

technical field [0001] The invention relates to the field of hydrometallurgy of uranium ore, in particular to a method for leaching black shale uranium-vanadium ore. Background technique [0002] Black shale is generally rich in organic matter and finely dispersed pyrite, siderite, etc. In the black shale-type uranium-vanadium ore, uranium exists mostly in a dispersed and adsorbed state, which is easier to leach; most of the vanadium exists in clay minerals such as mica and kaolinite in the form of trivalent, partially replacing silicon-oxygen octahedra and Aluminum, titanium, iron, etc. in the aluminum-oxygen octahedron, vanadium that exists in the isomorphic form must destroy its lattice structure and oxidize the vanadium before it can be leached. The leaching methods of uranium and vanadium ore are quite different according to the different occurrence forms of uranium and vanadium. In the early days, sodium roasting process was used to treat uranium-vanadium ore or sing...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B1/00C22B34/22C22B60/02
CPCC22B3/08C22B1/00C22B34/22C22B60/0234
Inventor 贾秀敏向秋林陈天宝刘会武刘忠臣黄永师留印李培佑
Owner BEIJING RES INST OF CHEM ENG & METALLURGY