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A method for microwave-assisted extraction of molybdenum

A microwave-assisted and microwave technology, applied in the direction of improving process efficiency, can solve the problems of lower grade of molybdenum ore resources, and achieve the effects of shortening leaching time, reducing volatilization rate, and simplifying the loading and unloading process

Active Publication Date: 2019-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the fact that the grade of domestic molybdenum ore resources is decreasing day by day, and the traditional roasting-leaching combined process cannot solve the problem of high-efficiency utilization of low-grade ore, it is particularly necessary to propose effective roasting-leaching process optimization ideas

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  • A method for microwave-assisted extraction of molybdenum
  • A method for microwave-assisted extraction of molybdenum
  • A method for microwave-assisted extraction of molybdenum

Examples

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Embodiment 1

[0076] Using molybdenite concentrate as raw material, 3g of molybdenite concentrate is made into pellets with a diameter of 5mm, dried, and air is introduced at a flow rate of 4L / min at a roasting temperature of 600°C and a roasting time of 90min. Carry out microwave-assisted oxidation roasting to obtain molybdenum calcined sand, the microwave frequency in the oxidation roasting is 2450MHz, and the microwave power in the oxidation roasting is 1200W;

[0077] Add sulfuric acid with a concentration of 1.0mol / L to the molybdenum calcined sand, and the liquid-solid ratio is 10:1ml / g; carry out microwave-assisted stirring and leaching at a temperature of 80°C for 60 minutes, and finally vacuum filter to separate the leaching residue and molybdenum-containing solution ; The stirring rate in the microwave-assisted leaching process is 400r / min. The frequency of the microwave during the leaching is 2450MHz, and the power of the microwave during the leaching is 500W;

[0078] In Exampl...

Embodiment 2

[0080] Using molybdenite concentrate as raw material, make 3g of molybdenite concentrate into pellets with a diameter of 5mm, dry them, and feed air at a flow rate of 4L / min at a roasting temperature of 600°C and a roasting time of 120min. Perform microwave-assisted oxidation roasting to obtain molybdenum calcined sand, the microwave frequency in the oxidation roasting is 2450MHz, and the microwave power in the oxidation roasting is 1200W;

[0081] In the molybdenum calcined sand, add sulfuric acid with a concentration of 1.0mol / L, and the liquid-solid ratio is 10:1ml / g; carry out microwave-assisted stirring and leaching for 60min at a temperature of 60°C, and finally vacuum filter to separate the leaching residue and molybdenum-containing solution ; The stirring speed in the microwave-assisted leaching process is 300r / min. The frequency of the microwave during the leaching is 2450MHz, and the power of the microwave during the leaching is 500W;

[0082] In Example 2, molybden...

Embodiment 3

[0084] Using molybdenite concentrate as raw material, make 3g of molybdenite concentrate into pellets with a diameter of 5mm, dry them, and feed air at a flow rate of 4L / min at a roasting temperature of 600°C and a roasting time of 90min. Perform microwave-assisted oxidation roasting to obtain molybdenum calcined sand, the microwave frequency in the oxidation roasting is 2450MHz, and the microwave power in the oxidation roasting is 1200W;

[0085]In the molybdenum calcined sand, add sulfuric acid with a concentration of 1.0mol / L, and the liquid-solid ratio is 10:1ml / g; carry out microwave-assisted stirring and leaching for 90min at a temperature of 80°C, and finally vacuum filter to separate the leaching residue and molybdenum-containing solution ; The stirring speed in the microwave-assisted leaching process is 300r / min. The frequency of the microwave during the leaching is 2450MHz, and the power of the microwave during the leaching is 500W;

[0086] In Example 3, molybdenum...

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Abstract

The invention relates to a microwave-assisted extraction method for molybdenum. According to the microwave-assisted extraction method for the molybdenum, molybdenite concentrate is used as the raw material and made into pellets, after drying treatment, microwave-assisted oxidizing roasting is conducted, the volatilization rates of molybdenum, rhenium and sulphur are controlled in the roasting process through adjustment and control of the roasting temperature and roasting time, so that the volatilization rates of rhenium and sulphur are increased, and the volatilization rate of the molybdenum is lowered at the same time; in the follow-up microwave-assisted leaching process of the oxidization roasting product, sulfuric acid is added, the leaching rate of the molybdenum is controlled throughadjustment and control of the microwave power, the leaching temperature and the leaching time; and finally, separation of leaching residues and a leaching liquor is achieved through vacuum extractionfiltration is achieved. The microwave-assisted extraction method for the molybdenum has the multiple advantages that the roasting time and leaching time are short, the technology is simple, and the production efficiency is high and has quite good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of microwave metallurgy, and in particular relates to a method for extracting molybdenum with microwave assistance. Background technique [0002] Molybdenum has excellent properties such as high strength, high melting point, corrosion resistance, and abrasion resistance. It has a wide range of application values ​​in iron and steel industry, nonferrous metallurgy, petrochemical, aerospace military, agriculture and other fields. All governments regard it as an important strategic resource. The abundance of molybdenum in the crust is very low, with an average content of only 1.1×10 -4 %. There are more than 20 kinds of molybdenum minerals found in nature, but only four kinds have industrial value. Among them, molybdenite is the molybdenum mineral with the most mining value, the largest reserves and the widest distribution. About 99% of molybdenum exists in the state of molybdenite, accounting for more than 90% of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/08C22B34/34
CPCC22B1/02C22B3/08C22B34/34Y02P10/20
Inventor 彭志伟李光辉姜涛彭健辉周林峰张元波饶明军李志忠叶雷唐慧敏范晓慧郭宇峰杨永斌徐斌杨凌志易凌云
Owner CENT SOUTH UNIV