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微波活化焙燒輝鉬礦生產(chǎn)低硫氧化鉬的實驗研究及機理分析
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西安建筑科技大學(xué)

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中圖分類號:

TD982/TF841.2

基金項目:

陜西省科技統(tǒng)籌創(chuàng)新工程計劃項目（2015KTZDGY09-01）；陜西省教育廳專項科研項目（17JK0439）；西安建筑科技大學(xué)青年科技基金（QN1316）


Experimental Study and Mechanism Analysis of Producing Low-sulfur Molybdenum Oxide by Microwave-activated Pre-calcination of Molybdenite
Author:
Affiliation:

Xi''an University of Architecture and Technology

Fund Project:

Shaanxi Science and Technology Coordination Innovation Project Plan (2015KTZDGY09-01); Shaanxi Provincial Department of Education Special Scientific Research Project (17JK0439); Xi''an University of Architecture and Technology Youth Science and Technology Fund (QN1316)

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    摘要:

    對比研究了微波功率、作用時間及物料重量對輝鉬礦預(yù)活化焙燒后的脫硫效果，并采用氣-固多相反應(yīng)的未反應(yīng)收縮核模型研究了輝鉬礦氧化焙燒的動力學(xué)。結(jié)果表明，輝鉬礦的吸波性能良好，在微波功率0.64kW、物料重量30g、微波作用6min的條件下，微波可比常規(guī)處理方式顯著降低硫含量0.256%；輝鉬礦氧化焙燒是強放熱反應(yīng)，溫度越高，輝鉬礦氧化速率越快； 540~630℃時轉(zhuǎn)化率明顯增高，界面化學(xué)反應(yīng)是控制性環(huán)節(jié)。微波對于輝鉬礦在常規(guī)氧化焙燒之前的活化作用已得到試驗驗證，若應(yīng)用于工業(yè)生產(chǎn)，可采用短時間活化焙燒預(yù)處理來輔助常規(guī)的氧化焙燒。

    Abstract:

    Comparison effect of microwave power, irradiation time and mass quantity on activation desulfurization of molybdenite and conventional oxidative roasting was experimentally studied; unreacted shrinkage nucleus model of gas-solid heterogeneous reaction was adopted to study reaction kinetics. Results showed that molybdenite concentrate had good microwave absorption performance, and optimum desulfurization effect was obtained with 0.64kW microwave irradiation on 30g molybdenite for 6 minutes, the relative sulfur content rate was reduced 65.47% by contrast with traditional oxidizing roasting; the oxidation of molybdenite is highly exothermic with faster oxidation rate at higher reaction temperature; the conversion rate is obviously increased at 540~630 °C with interfacial chemical reaction as rate controlling step. The effect of microwave activation of molybdenite concentrate prior to conventional oxidative roasting has been tested and verified. As for industrial application, a short-time activated calcination pretreatment can be used to assist conventional oxidative roasting, and an optimized process with fast reaction rate and a low sulfur content of molybdenum calcine can be obtained.

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王苗.微波活化焙燒輝鉬礦生產(chǎn)低硫氧化鉬的實驗研究及機理分析[J].稀有金屬材料與工程,2020,49(1):48~58.[wang miao. Experimental Study and Mechanism Analysis of Producing Low-sulfur Molybdenum Oxide by Microwave-activated Pre-calcination of Molybdenite[J]. Rare Metal Materials and Engineering,2020,49(1):48~58.]
DOI：10.12442/j. issn.1002-185X.20180787

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  • 收稿日期:2018-07-21
  • 最后修改日期:2019-11-15
  • 錄用日期:2018-11-05
  • 在線發(fā)布日期: 2020-02-16
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