Method for preparing high purity molybdenum trioxide by one-step roasting of molybdenite concentrate

A molybdenum trioxide and concentrate technology, applied in the direction of molybdenum oxide/molybdenum hydroxide, etc., can solve the problems of high material requirements, large thermal energy consumption, low molybdenum recovery rate, etc., and achieves good equipment adaptability, convenient waste gas treatment, molybdenum The effect of high recovery rate

Active Publication Date: 2018-08-10
CENT SOUTH UNIV
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Benefits of technology

This patented technology allows for efficient use of highly pure meteous molded products made from refractory metal carbon sources like molysitride concentrations. It achieves these technical results through improved methods that involve treatments such as calcination, acidification, reduction of oxygen content, addition of certain substances (alums), adjustment of pH levels, control over particle size distribution during processing steps, and various techniques used on the resulting material. These improvements improve their quality and performance compared to existing processes.

Problems solved by technology

Technological Problem addressed in this patent relating to improving the yield and purification rates of crude molyblitic sulfides from pyrometry bimickelate nicklecobalt complexes during manufacturing operations. Current methods involve multiple step procedures involving different reagent types, leading to increased costs and reduced flexibility in terms of feedstock options.

Method used

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  • Method for preparing high purity molybdenum trioxide by one-step roasting of molybdenite concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add 10% alumina powder to a high-grade molybdenum fine powder containing Mo 57.36%, Si 0.85%, Ca 0.27%, Fe 0.61%, Al 0.19%, Pb 0.08%, Cu 0.07%, and make The ball obtains a green ball with a diameter of about 8mm and a water content of about 12%, and the cloth is placed on the grate machine with a thickness of about 50mm. First blow in 120°C low-temperature hot air for 10 minutes, and then blow in 950°C high-temperature hot air from bottom to top, and the air volume per square meter is controlled at 300m 3 / h, the mixed steam is pumped into the quench chamber and the solid product is collected through a cloth bag. After 25 minutes, the high-temperature hot air supply was stopped, and the tailings and products were tested, and the product purity was calculated to be higher than 99.9%, and the molybdenum recovery rate was 96.47%.

[0033] If the height of the material layer is increased to 100mm, the air volume per square meter is increased to 350m 3 / h, other conditions...

Embodiment 2

[0035] Add 7% alumina powder to a high-grade molybdenum fine powder containing 55.62% Mo, 1.45% Si, 1.14% Ca, 0.70% Fe, 0.27% Al, 0.10% Pb, and 0.07% Cu. The ball obtains a green ball with a diameter of about 8mm and a water content of about 10%, and the cloth is placed on the grate machine with a thickness of about 50mm. First let in 120°C low-temperature hot air for 10 minutes, and then blow in 1000°C high-temperature hot air from bottom to top, and the air volume per square meter is controlled at 300m 3 / h, the mixed steam is pumped into the quench chamber and the solid product is collected through a cloth bag. After 25 minutes, the high-temperature hot air supply was stopped, and the tailings and products were tested, and the product purity was calculated to be higher than 99.9%, and the molybdenum recovery rate was 91.32%.

Embodiment 3

[0037] Add 5% quartz powder to a medium-grade molybdenum fine powder containing Mo 52.05%, Si 4.85%, REE 1.74%, Ca 1.48%, Fe 0.92%, Pb 0.14%, Cu 0.09%, and make The ball obtains a green ball with a diameter of about 8mm and a water content of about 10%, and the cloth is placed on the grate machine with a thickness of about 50mm. First blow in 120°C low-temperature hot air for 10 minutes, and then blow in 1050°C high-temperature hot air from bottom to top, and the air volume per square meter is controlled at 300m 3 / h, the mixed steam is pumped into the quench chamber and the solid product is collected through a cloth bag. After 30 minutes, the supply of high-temperature hot air was stopped, and the purity of the product was calculated to be higher than 99.8%, and the recovery rate of molybdenum was 85.47%.

[0038] If no plasticizer is added and other process conditions remain unchanged (that is, other condition parameters are consistent with those in Implementation 3), the f...

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Abstract

The invention relates to a method for preparing high purity molybdenum trioxide by one-step roasting of molybdenite concentrate, and belongs to the technical field of molybdenum chemical product production and preparation. Middle and high grade molybdenum fine powder is a raw material. The raw material is directly made into balls. After drying treatment, the balls are heated to 900-1100 DEG C to react under the condition of filling carrying gas to obtain mixture vapor, oxygen containing gas being the carrying gas. The mixture vapor is cooled to obtain the high purity molybdenum trioxide. Exhaust gas with high SO2 concentration obtained by the reaction can be used for acid making with low cost. The method integrates oxidation of molybdenite and volatilization of the molybdenum trioxide. Themethod has advantages of high efficiency production, high molybdenum recovery rate, low energy consumption, good equipment adaptability, convenient exhaust-gas treatment, and the like, and is suitable for industrial application.

Description

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Claims

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Application Information

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Owner CENT SOUTH UNIV
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