Production process for recovering uranium and molybdenum from sedovite acid leaching tailings

A production process and technology for recovering uranium, which is applied in the fields of chemical industry and metallurgy, can solve the problems that uranium and molybdenum cannot be recovered, the secondary pollution of the surrounding environment, and the increase of tailings management costs, etc. Pollution, atmospheric environment complete effect

Inactive Publication Date: 2018-03-02
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

[0002] Some uranium and molybdenum ores are refractory ores. Using the traditional acid method enhanced stirring leaching process, although the leaching rate of uranium and molybdenum can reach more than 80% and 50%, the average grade of uranium and molybdenum in the tailings is still 0.04% and 0.04%. 1.0%, if the tailings are directly neutralized and sent to the tailings pond, the uranium and molybdenum in the tailings cannot be recovered, resulting in a large waste of resources
The current treatment method is temporary storage, but the storage of tailings requires a large amount of temporary land, which increases the cost of tailings management. At the same time, the content of uranium in the tailings is high, and radioactive dust will also cause secondary pollution to the surrounding environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The uranium-molybdenum ore acid leaching tailings with uranium and molybdenum grades of 0.03% and 0.604% were dried, crushed and finely ground to a particle size of less than 100 mesh, and the sulfur content in the tailings was 1.35%, according to the CaO / S molar ratio of 1.0 Mix evenly, then mix with water to granulate, control the maximum particle size at 15mm, send it to the rotary kiln for roasting at 400°C for 1 hour, cool the roasted ore to 100°C and build a heap, the height of the heap is 2m, and then spray leaching, In the early stage of leaching, the concentration of sulfuric acid in the spraying leaching agent is 30g / L, and the spraying intensity is 50L / (m 2 h), spraying in intervals, spraying 10h a day, and the spraying time is 3 days; the concentration of sulfuric acid in the leaching agent in the late leaching period is 10g / L, spraying in intervals, spraying 10h a day, and the spraying intensity is 10L / (m 2 h), the spraying time is 5 days.

[0042] After l...

Embodiment 2

[0044] Dried uranium-molybdenum ore acid leaching tailings with uranium and molybdenum grades of 0.03% and 0.604%, crushed and finely ground to a particle size of less than 100 mesh, wherein the sulfur content in the tailings was 1.35%, and the CaO / S molar ratio was 2.0 Mix evenly, then mix with water to granulate, control the maximum aggregate particle size at 10mm, send it to the rotary kiln for roasting at 800°C for 5 hours, and pile the roasted ore after cooling at 200°C, the height of the pile is 6m, and then spray leaching, leaching The concentration of sulfuric acid in the pre-spray leaching agent is 50g / L, and the spray intensity is 100L / (m 2 h), intermittent spraying, spraying 16h per day, and the spraying time is 10 days; the concentration of sulfuric acid in the leaching agent in the later stage of leaching is 20g / L, intermittent spraying, spraying 16h per day, and the spraying intensity is 30L / (m 2 h), the spraying time is 15 days.

[0045] After leaching, the sla...

Embodiment 3

[0047] Dried uranium-molybdenum ore acid leaching tailings with uranium and molybdenum grades of 0.03% and 0.604%, crushed and finely ground to a particle size of less than 100 mesh, wherein the sulfur content in the tailings was 1.35%, and the CaO / S molar ratio was 1.5 Mix evenly, then mix with water to granulate, control the maximum aggregate particle size at 10mm, send it to the rotary kiln for roasting at 700°C for 3 hours, and then pile up the roasted ore after cooling at 150°C, the height of the pile is 4m, and then spray leaching, leaching The concentration of sulfuric acid in the pre-spray leaching agent is 50g / L, and the spray intensity is 80L / (m 2 h), spraying in intervals, spraying 16 hours a day, and the spraying time is 6 days; the concentration of sulfuric acid in the leaching agent in the late leaching period is 20g / L, spraying in intervals, spraying 12 hours a day, and the spraying intensity is 15L / (m 2 h), the spraying time is 8 days.

[0048] After leaching,...

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PUM

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Abstract

The present invention discloses a production process for recovering uranium and molybdenum from sedovite acid leaching tailings. The production process comprises: carrying out breaking and fine grinding on dried sedovite acid leaching tailings, uniformly mixing the grinded sedovite acid leaching tailings and an additive, adding water, granulating, carrying out high temperature calcination on the ore pellets, cooling the calcined ore, piling, and leaching by spraying a sulfuric acid solution. According to the present invention, the ore and the sulfur fixing agent are uniformly mixed, and granulation is performed, such that no smoke dust is generated during the calcination, more than 98% of sulfur is cured in the ore, the calcined ore can be subjected to pile leaching so as to eliminate thesolid-liquid separation and achieve the high comprehensive utilization of resources, and the uranium and molybdenum resources are comprehensively recycled, wherein the uranium leaching rate and the molybdenum leaching rate respectively are more than 65% and more than 75%; and the production process has high economic value, the leached tailings can be directly piled and stored in the tailings warehouse after the neutralization, and the whole process is environment-friendly and pollution-free.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and metallurgy, and specifically relates to a production process for recovering uranium and molybdenum from uranium-molybdenum ore acid leaching tailings. Background technique [0002] Some uranium and molybdenum ores are refractory ores. Using the traditional acid method enhanced stirring leaching process, although the leaching rate of uranium and molybdenum can reach more than 80% and 50%, the average grade of uranium and molybdenum in the tailings is still 0.04% and 0.04%. 1.0%, if the tailings are directly neutralized and sent to the tailings pond, the uranium and molybdenum in the tailings cannot be recovered, resulting in a large waste of resources. The current treatment method is temporary stockpiling, but stockpiling tailings requires a large amount of temporary land, which increases the cost of tailings management. At the same time, the tailings contain high uranium content, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02C22B3/08C22B60/02C22B34/34
CPCC22B1/02C22B7/001C22B7/007C22B7/04C22B34/34C22B60/0208C22B60/0234Y02P10/20
Inventor 师留印向秋林杨剑飞刘会武刘忠臣陈天宝黄永贾秀敏刘智
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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