Method for volatilizing and enriching molybdenum from molybdenum tailings

A molybdenum tailings and enrichment technology, applied in the field of solid waste recycling, can solve the problems of no relevant research reports and limitations of enrichment and recovery, and achieve the effect of solving sand and dust pollution and debris flow hidden dangers and reducing production costs

Inactive Publication Date: 2009-08-26
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And currently in SiO 2 The research on resource utilization of molybdenum tailings as the main phase is generally limited to the traditional thinking, that is, using tailings to manufacture glass-ceramic or multi-element silicon fertilizer, and there is still no relevant research on the enrichment and recovery of molybdenum in molybdenum tailings. research report

Method used

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  • Method for volatilizing and enriching molybdenum from molybdenum tailings
  • Method for volatilizing and enriching molybdenum from molybdenum tailings
  • Method for volatilizing and enriching molybdenum from molybdenum tailings

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Embodiment 1

[0025] Huludao molybdenum tailings are used, and the main phase of the tailings is SiO 2 , the molybdenum content is 0.19%, the tailings are ball milled to a particle size within the range of 0.08-0.1mm, and water is added to stir, so that the molybdenum tailings form a molybdenum tailings slurry with a certain rheological property with a water content of 30%-40% WT , in order to better contact and react with acid. Then add 0.25mlHF (hydrofluoric acid) metering according to every gram of dry base molybdenum tailings, the concentration of this HF is 40%WT, after the reaction bubble disappears, add HCl (hydrochloric acid), the concentration of HCl is 36%WT, the addition of hydrochloric acid The amount is 0.25ml HCl / g dry molybdenum tailings. After adding acid, cover and heat at 250°C for 40 minutes, remove the cover after heat treatment, and dry at 65°C until the mass change is less than 5%. The pretreated molybdenum tailings are heated by HF-HCl and heat-treated at 900°C to m...

Embodiment 2

[0027] Except that the added amount of hydrochloric acid is 1ml HCl / g dry base molybdenum tailings, the others are the same as in Example 1, and the high-temperature volatilization rate of molybdenum can reach 98.6% at 900°C.

Embodiment 3

[0029] Except that the addition of hydrofluoric acid is 0.625ml / g dry base molybdenum tailings, and the addition of hydrochloric acid is 0.625ml / g dry base molybdenum tailings, the rest are the same as in Example 1, and the high temperature volatility of molybdenum at 900°C can be Reached 85.8%.

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Abstract

A method for volatilizing and enriching molybdenum from molybdenum tailings relates to a process for utilizing the molybdenum tailings for enriching and recovering the molybdenum. The molybdenum tailings are firstly ground, and the water content thereof is regulated to 30-40%WT to lead the molybdenum tailings to form slurry of the molybdenum tailings. Then, hydrofluoric acid is added in the slurry of the molybdenum tailings, hydrochloric acid is further added after the bubbles disappear and the reaction is complete; after that, the slurry of the molybdenum tailings is heated to 200-250 DEG C, a cover is used for thermal insulation for 30-50min to promote the formation of chloride of the molybdenum, then the cover is removed, and the drying is carried out at 65 DEG C. Finally, the thermal treatment of the molybdenum tailings after the pretreatment with the acid is carried out at 900 DEG C, thereby generating flue gas containing the molybdenum and silicon tetrafluoride and the residues of the thermal treatment, and the residues are used as road-building materials; the collected flue gas is condensed; when the temperature is lower than 250 DEG C, substances containing the molybdenum or molybdenum compounds are recovered; the silicon tetrafluoride in the flue gas is absorbed and hydrolyzed by using water, the filtration is carried out, and filtrate is fluorosilicic acid solution. The process of the invention is simple and easy to control, the products during the process can be recovered, the cost is low, the method has no environmental pollution, and the high temperature volatilization rate of the molybdenum achieves 70 percent-98.6 percent.

Description

technical field [0001] The invention discloses a method for volatilizing molybdenum from molybdenum tailings at high temperature, relates to a process for enriching and recovering molybdenum by using molybdenum tailings, and belongs to the technical field of solid waste resource utilization. technical background [0002] At present, 80% of molybdenum tailings are stored mostly in tailings dams (reservoirs) and on the surface, which occupy a large amount of land, pollute the environment, and constitute potential geological disasters. Molybdenum is a rare mineral with less mine output, excellent performance and wide application. According to statistics, the annual discharge of molybdenum tailings in molybdenum mines in China is about 3.2 million tons, and these molybdenum tailings still contain 0.1-0.5% Although the molybdenum content seems to be very low, the metal molybdenum content is quite considerable when the tailings discharge is particularly large, and the value is hug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B3/10
CPCY02P10/20
Inventor 赵由才唐平施永军梁恩臣
Owner TONGJI UNIV
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