Kinetics of scheelite concentrate digestion with sulfuric acid in the presence of phosphoric acid

被引：85

作者：

Li, Jiangtao ^{[1
]}

Zhao, Zhongwei ^{[1
,2
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

[2] Key Lab Hunan Prov Met & Mat Proc Rare Met, Changsha 410083, Hunan, Peoples R China

来源：

HYDROMETALLURGY | 2016年 / 163卷

关键词：

Kinetics; Scheelite concentrates; Decomposition process; Sulfuric and phosphoric adds; HYDROCHLORIC-ACID;

D O I：

10.1016/j.hydromet.2016.03.009

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Considering the strict environmental requirements and cost of energy consumption, a cheap and non-volatile agent (H2SO4) was used to digest scheelite concentrate in the presence of phosphoric acid. In the digestion process, tungsten was completely leached in the form of a highly soluble 12-tungstophosphoric heteropoly acid (H3PW12O40), and calcium remained in the residue as CaSO4 center dot nH(2)O, which can be later used as cement raw materials. The effects of the leaching parameters, the concentrations of H2SO4 and H3PO4, the temperature and the particle size, were analysed to model the kinetics of scheelite decomposition. The kinetics data were consistent with the shrinking-core model, and the apparent activation energy of 63.8 kJ/mot shows that the system was under chemical reaction control. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：55 / 60

页数：6

共 18 条

[1]

Fang Q., 2001, CHINA TUNGSTEN IND, V16, P80, DOI [10.3969/j.issn.1009-0622.2001.05.022, DOI 10.3969/J.ISSN.1009-0622.2001.05.022]

[2] Acidic leaching of scheelite concentrate and production of hetero-poly-tungstate salt [J].

Gürmen, S ;

Timur, S ;

Arslan, C ;

Duman, I .

HYDROMETALLURGY, 1999, 51 (02) :227-238

[3] Dissolution behavior of calcium tungstate in oxalic acid solutions [J].

Kalpakli, A. O. ;

Ilhan, S. ;

Kahruman, C. ;

Yusufoglu, I. .

HYDROMETALLURGY, 2012, 121 :7-15

[4]

Lassner E., 1999, Tungsten: properties, chemistry, technology of the element, alloys, and chemical compounds, P159, DOI [10.1007/978-1-4615-4907-9, DOI 10.1007/978-1-4615-4907-9]

[5]

Lassner E., 1995, INT J REFRACT MET H, V13, P36

[6]

Li H.G., 1996, CHINA TUNGSTEN IND, V12, P46

[7]

Li H. G, 1999, NONFERROUS METAL EXT, P55

[8]

Li W.Q., 1998, RARE METALS CEMENT C, V132, P5

[9] Leaching Systems of Wolframite and Scheelite: A Thermodynamic Approach [J].

Martins, J. I. .

MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW, 2014, 35 (01) :23-43

[10] Leaching of synthetic scheelite by hydrochloric acid without the formation of tungstic acid [J].

Martins, JI ;

Moreira, A ;

Costa, SC .

HYDROMETALLURGY, 2003, 70 (1-3) :131-141

← 1 2 →