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Method for preprocessing wrapped uranium-molybdenum ores through oxidizing roasting

An oxidative roasting and wrapping technology, applied in the field of uranium-molybdenum ore processing, can solve the problems of high operation and maintenance costs, difficult solid-liquid separation of ore slurry, high processing and manufacturing requirements, and achieves low impurity content in solution, low reagent consumption, The effect of low production cost

Inactive Publication Date: 2016-03-23
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

Conventional acid leaching or alkali leaching uses sulfuric acid or alkali as the leaching agent, hydrogen peroxide, pyrolusite or potassium permanganate as the oxidizing agent, and heating and stirring for leaching. The molybdenum leaching rate of this method is only 50% to 60%. The molybdenum leaching rate can reach about 80%, but this method has problems such as large reagent consumption, high requirements for equipment, materials and processing and manufacturing, high operation and maintenance costs, and difficulty in solid-liquid separation of ore pulp; Or sodium chlorate-assisted oxidation for comprehensive recovery of uranium and molybdenum, the molybdenum leaching rate of this method can reach about 80%. implement

Method used

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  • Method for preprocessing wrapped uranium-molybdenum ores through oxidizing roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A packaged uranium-molybdenum ore in a certain place, the main chemical components of the original ore are uranium grade of 0.106% and molybdenum grade of 1.26%.

[0020] (1) crushing and finely grinding the wrapped uranium-molybdenum ore to a particle size of -100 mesh;

[0021] (2) directly roasting the crushed and finely ground uranium-molybdenum ore of step (1), the roasting temperature is 600 DEG C, and the roasting time is 10min to obtain calcine;

[0022] (3) After cooling the calcine, use a sulfuric acid solution with a concentration of 80g / L to carry out stirring leaching at 60°C, the leaching time is 2h, the leaching liquid-solid ratio is 1:1, and then the leaching pulp is subjected to solid-liquid separation;

[0023] (4) performing solvent extraction on the solution obtained in step (3) to extract uranium and molybdenum.

[0024] The results showed that the leaching rate of uranium was 91.4%, and the leaching rate of molybdenum was 84.5%.

Embodiment 2

[0026] A packaged uranium-molybdenum ore in a certain place, the main chemical components of the original ore are uranium grade of 0.154% and molybdenum grade of 1.03%.

[0027] (1) crushing and finely grinding the wrapped uranium-molybdenum ore to a particle size of -60 mesh;

[0028] (2) directly roasting the crushed and finely ground uranium-molybdenum ore in step (1), the roasting temperature is 550°C, and the roasting time is 15min to obtain calcine;

[0029] (3) After cooling the calcine, use a sulfuric acid solution with a concentration of 100g / L to carry out stirring leaching at 60°C, the leaching time is 2h, the leaching liquid-solid ratio is 1:1, and then the leaching pulp is subjected to solid-liquid separation;

[0030] (4) performing solvent extraction on the solution obtained in step (3) to extract uranium and molybdenum.

[0031] The results showed that the leaching rate of uranium was 94.6%, and the leaching rate of molybdenum was 84.3%.

Embodiment 3

[0033] A parcel-type uranium-molybdenum ore in a certain place, the main chemical components of the original ore are uranium grade of 0.08% and molybdenum grade of 1.47%.

[0034] (1) crushing and finely grinding the wrapped uranium-molybdenum ore to a particle size of -150 mesh;

[0035] (2) directly roasting the crushed and finely ground uranium-molybdenum ore in step (1), the roasting temperature is 550°C, and the roasting time is 3min to obtain calcine;

[0036] (3) After cooling the calcine, use a sulfuric acid solution with a concentration of 100g / L to carry out stirring leaching at 20°C, the leaching time is 2h, the leaching liquid-solid ratio is 1.5:1, and then the leaching pulp is subjected to solid-liquid separation;

[0037] (4) performing solvent extraction on the solution obtained in step (3) to extract uranium and molybdenum.

[0038] The results showed that the leaching rate of uranium was 90.5%, and the leaching rate of molybdenum was 87.3%.

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Abstract

The invention belongs to the technical field of uranium-molybdenum ore processing, specifically relates to a method for preprocessing wrapped uranium-molybdenum ores through oxidizing roasting, aims to overcome the shortages of prior art and further improve the leaching rate of valuable metal such as uranium, molybdenum, and the like, and provides a method for improving the leaching rate of uranium and molybdenum in wrapped uranium-molybdenum ores through an oxidizing roasting pretreatment. Through the oxidizing roasting treatment, the colloidal sulfur-molybdenum ore wrapping is destroyed, thus the oxidation of molybdenum ores in the wrapped uranium-molybdenum ores is promoted, and molybdenum becomes easier for leaching. After oxidizing roasting treatment, uranium and molybdenum can be leached out under a lower acid degree at a lower temperature, the leaching rate of uranium can reach 90% or more, the leaching rate of molybdenum can reach 80% or more, the leaching rates are improved by 5% and 30% respectively compared with the conventional method, moreover, no oxidizing agent is used during the leaching process, and the liquid and solid in leached ore slurry can be separated easily. The method has the advantages of low burning temperature, high oxidation rate of uranium and molybdenum, simple technology, little consumption of reagent, and low production cost.

Description

technical field [0001] The invention belongs to the technical field of uranium-molybdenum ore processing, and in particular relates to a method for oxidative roasting pretreatment of encapsulated uranium-molybdenum ore. Background technique [0002] The characteristics of encapsulated uranium-molybdenum ore are that there is a special form of molybdenum mineral-colloid molybdenum ore in the ore, that is, homogeneous amorphous, colloidal MoS produced in the form of gel and spherical particles. 2 . Amorphous, colloidal MoS produced in the form of black fine powder or colloid due to the order of internal ore formation 2 It is often the supergenic ore attached to the surface of molybdenum ore or other ores (such as pitchblende), and a dense sulfide package is formed on the attached ore, which hinders the penetration of the leaching agent into the inclusions and the oxidant's effect on the molybdenum ore. Oxidation increases the difficulty of molybdenum leaching. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/08C22B3/26C22B34/34C22B60/02
CPCC22B1/02C22B3/08C22B34/34C22B60/0208C22B60/0234C22B60/026
Inventor 向秋林师留印曾毅君杨剑飞刘会武贾秀敏李培佑刘忠臣陈天宝黄永
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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