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Method for separating and extracting high-purity molybdenum oxide from low-grade molybdenite through microwave roasting

A microwave roasting and molybdenite technology is applied in the field of molybdenum metallurgy, which can solve the problems of low molybdenite grade, cumbersome grinding process, low molybdenum extraction rate, etc. Effect

Active Publication Date: 2022-01-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the molybdenum content of most molybdenites is 40% to 50%, there are also some molybdenites with lower grades and molybdenum content below 20%. In this low-grade molybdenite, molybdenum is mixed and coated In other phases, when the microwave roasting method is used to separate and extract molybdenum oxide, since molybdenum disulfide is difficult to contact oxygen in a large area, less molybdenum trioxide is formed by the reaction, and the extraction rate of molybdenum in minerals is low.
In order to obtain molybdenum trioxide products as much as possible, it is often necessary to control the mineral thickness at the millimeter level during the microwave roasting process and grind it to finer particles as much as possible. The processing volume is small, and the grinding process is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Microwave roasting of low-grade molybdenite to separate and extract high-purity molybdenum oxide includes the following steps:

[0030] (1) The low-grade molybdenite is crushed, adding a concentration of 12wt% sodium carbonate solution and a concentration of 25wt% glycerol solution, wherein the mass volume ratio of molybdenite, sodium carbonate solution and glycerol solution is 12g: 2.5mL: 1mL, ball mill until the particle size is 80 mesh, continue to stir for 40min, then add silicon carbide and nickel chloride, wherein the mass ratio of nickel chloride to molybdenite is 1:18, and the mass ratio of silicon carbide to molybdenite is 1 : 9, stir evenly, then spread it to a thickness of 7cm, and place it in the microwave cavity;

[0031] (2) Turn on the microwave output switch, according to 10m 3 Inject compressed air at a flow rate of / h, adjust the microwave output power to 3kW, raise the temperature from room temperature to 350°C at a rate of 50°C / min, and keep it for ...

Embodiment 2

[0035] Low-grade molybdenite microwave roasting separation and extraction of high-purity molybdenum oxide, the steps are as follows:

[0036] (1) The low-grade molybdenite is crushed, adding a sodium hypochlorite solution with a concentration of 10wt% and an aqueous glycerin solution with a concentration of 20wt%, wherein the mass volume ratio of the molybdenite, sodium hypochlorite solution and aqueous glycerin is 15g: 3mL: 1mL, ball milling Be 50 orders to particle size, continue stirring 50min, add silicon carbide and nickel chloride afterwards, wherein, the mass ratio of nickel chloride and molybdenite is 1: 15, the mass ratio of silicon carbide and molybdenite is 1: 8, Stir well, then spread it to a thickness of 5cm, and place it in the microwave cavity;

[0037] (2) Turn on the microwave output switch, according to 5m 3 Inject compressed air at a flow rate of / h, adjust the microwave output power to 3kW, raise the temperature from room temperature to 380°C at a rate of ...

Embodiment 3

[0040] Microwave roasting of low-grade molybdenite to separate and extract high-purity molybdenum oxide includes the following steps:

[0041] (1) Crushing the low-grade molybdenite, adding a concentration of 15wt% sodium carbonate solution and a 30wt% glycerol solution, wherein the mass volume ratio of molybdenite, sodium carbonate solution and glycerol solution is 10g: 2mL: 1mL , ball milled to a particle size of 100 mesh, continued to stir for 30min, then added silicon carbide and nickel chloride, wherein the mass ratio of nickel chloride to molybdenite was 1:20, and the mass ratio of silicon carbide to molybdenite was 1: 10. Stir evenly, then spread it to a thickness of 10cm, and place it in the microwave cavity;

[0042] (2) Turn on the microwave output switch, according to 15m 3Inject compressed air at a flow rate of / h, adjust the microwave output power to 3kW, raise the temperature from room temperature to 320°C at a rate of 50°C / min, and keep it for 60 minutes; The ...

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Abstract

The invention discloses a method for separating and extracting high-purity molybdenum oxide from low-grade molybdenite through microwave roasting, belonging to the technical field of molybdenum metallurgy. The method comprises the following steps: crushing molybdenite, adding an alkaline solution and an aqueous glycerol solution, carrying out grinding, then adding silicon carbide and nickel chloride, carrying out microwave roasting to obtain molybdenum trioxide steam, and then cooling the molybdenum trioxide steam. According to the invention, the alkaline solution and the aqueous glycerol solution are added in a grinding process, dissolution of molybdenum in the low-grade molybdenite can be promoted, more molybdenum can participate in an oxidation reaction in a microwave roasting process, and therefore, the yield of the product molybdenum trioxide is increased, and the utilization rate of molybdenum in the low-grade molybdenite is increased; and meanwhile, nickel chloride is added as a catalyst in the microwave roasting process, the oxidation temperature of molybdenum disulfide can be reduced, a reaction rate can be increased, oxidation reaction can be completed at a low temperature within a short time, molybdenum trioxide is generated, and therefore, energy consumption is greatly reduced, and a production period is shortened.

Description

technical field [0001] The invention belongs to the technical field of molybdenum metallurgy, and in particular relates to a method for separating and extracting high-purity molybdenum oxide by microwave roasting of low-grade molybdenite. Background technique [0002] Molybdenum is rarely distributed in nature, and its average content in the earth's crust is only 0.001%, but molybdenum is a precious rare high-melting point metal, which is widely used in the production of alloy steel, alloy cast iron, heat-resistant steel and stainless steel, etc. . Molybdenum and its alloys have become indispensable modern metals in petroleum, chemical and steel industries due to their good physical and chemical properties. [0003] Molybdenite is the most common and important mineral for molybdenum supply in the world today. Molybdenite is often produced in the contact zone between granite and limestone and in pegmatite gas deposits. Molybdenite is the most important mineral raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02B01J27/128
CPCC01G39/02B01J27/128C01P2006/80Y02P10/20
Inventor 刘秉国周俊文
Owner KUNMING UNIV OF SCI & TECH
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