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Study on the Process of Copper Restores the Salt of Molybdenum

Author: ZhangXiaoLin
Tutor: YangYouMing
School: Jiangxi University of Technology
Course: Non-ferrous metallurgy
Keywords: Separation of tungsten and molybdenum Copper reduction Molybdenum Potential-pH diagram Dynamics
CLC: TF841
Type: Master's thesis
Year: 2010
Downloads: 85
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Abstract


Separation of tungsten and molybdenum in tungsten and molybdenum smelting process , the technical problems to be solved , is one of the important aspects to ensure the tungsten molybdenum metallurgy sustainable development . Based on comprehensive analysis of the research results of the existing tungsten molybdenum separation , through a large number of theoretical analysis and experimental research , to take advantage of differences in the electrochemical properties of tungsten and molybdenum , tungsten, molybdenum, copper reductant restore conduct . The main contents are as follows : ( 1) to study and draw the Mo-H2O potential-pH diagram , W-H2O potential -pH diagrams as well as Mo (Cu) -H 2 O potential -pH diagram . ( 2 ) to study the kinetics of copper reduction molybdate process . Was determined by the initial rate method the reaction order for H is 0.68 , 0.89 of Mo ; studied the relationship between the reaction rate and reaction temperature , the activation energy was measured at 30 ° C when 76.37KJ · mol -1 ; explore the molybdenum copper reduction reaction mechanism , the reduction process by the interfacial chemical reaction control . (3) research in with no EDTA complexing conditions the acidity , the reaction time is EDTA used in an amount of temperature reduction rate of molybdenum impact . The results showed that the use of complexing agents , leading to the decline of molybdenum reduction rate ; in the case without the use of a complexing agent , as long as the pH of the system is less than 2 , will not produce a tungstic acid copper precipitation of copper with molybdate ; reduction reaction requires system of high acidity . (4) the characteristics of molybdenum reduction products and its alkali solution test study . The results show that the reduction product for the the hexagonal columnar uniform the crystal , the product of molybdenum was 5.72 price ; alkali solution at room temperature for 2 hours , the amount of 1.2 times the theoretical amount of alkali , alkaline hydrolysis rate could reach 97.8% ; alkaline hydrolysis process . The reaction mechanism is reduced state molybdenum under alkaline conditions is preferentially oxidized by oxygen , part of the copper ions are reduced , to generate the molybdate Qingyanghuatong and a very small amount of copper powder .

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Rare metal smelting > Refractory metals smelting ( high - temperature molten metal )
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