Generation and reduction mechanism of silicate minerals containing iron in deep reduction of rough concentrate from iron tailings

被引：1

作者：

Fan, Duncheng ^{[1
]}

Ni, Wen ^{[1
]}

Li, Jin ^{[1
]}

Li, Yuan ^{[1
]}

Qiu, Xiajie ^{[1
]}

Fu, Chenghong ^{[1
]}

Li, Dezhong ^{[1
]}

机构：

[1] Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2015年 / 46卷 / 06期

关键词：

Hedenbergite; Iron tailings; Reduction; Silicate phases;

D O I：

10.11817/j.issn.1672-7207.2015.06.001

中图分类号：

学科分类号：

摘要：

Test methods including chemical analysis,X-ray diffraction, scanning electron microscope and X-ray energy spectrum analysis were used to study generation and reduction mechanism of silicate minerals containing iron in deep reduction of rough concentrate from Qidashan iron tailings. The results show that when the reduction temperature is lower than 720 ℃, some iron oxides react with gangue minerals in solid state which increases the iron mass fraction of silicate minerals containing iron from 20.66% to 27.56%. When the reduction temperature is between 770 ℃ and 930 ℃, numerous complicated silicate minerals containing rich iron are generated due to the occurrence of a large number of wustite and the addition of Na2CO3 which makes the iron content of silicate minerals containing iron increases from 28.03% to 53.18%. When reduction temperature is 930 ℃, a lot of hedenbergite and a small amount of fayalite and kirschsteinite are crystallized. Because of the effect of basic oxide (CaO), fayalite can not exist stably in large quantity and transform into hedenbergite and kirschsteinite with better reducibility. Under conditions of high temperature reduction, iron ions in hedenbergite and kirschsteinite get into complicated silicate phase and move to the surface where the reduction reaction occurs. Metallic iron gathers and forms crystal stock on the surface forming iron rim. When the reduction temperature is 1 300 ℃, the iron content of silicate minerals containing iron decreases to 9.13%. ©, 2015, Central South University of Technology. All right reserved.

引用

页码：1973 / 1980

页数：7

共 22 条

[1]

Han Y., Li Y., Liu J., Et al., Deep reduction-efficient separation technology applied to refractory iron ore, Metal Mine, 11, pp. 1-4, (2011)

[2]

Han Y., Zhang C., Sun Y., Et al., Mechanism analysis on deep reduction of complex refractory iron ore promoted by Na<sub>2</sub>CO<sub>3</sub>, Journal of Northeastern University (Science and Technology), 33, 11, pp. 1633-1636, (2012)

[3]

Liu G., Strezov V., Lucas J.A., Et al., Thermal investigations of direct iron ore reduction with coal, Thermochemica Acta, 410, 1-2, pp. 133-140, (2004)

[4]

Sun Y., Gao P., Han Y., Et al., Reaction behavior of iron minerals and metallic iron particles growth in coal-based reduction of an oolitic Iron ore, Industrial and Engineering Chemistry Research, 52, 6, pp. 2323-2329, (2013)

[5]

Jozwiak W.K., Kaczmarek E., Maniecki T.P., Et al., Reduction behavior of iron oxides in hydrogen and carbon monoxide atmospheres, Applied Catalysis A: General, 326, 1, pp. 17-27, (2007)

[6]

Wei Y., Sun T., Kou J., Et al., Effect of coal dosage on direct reduction roasting of refractory iron ore briquettes, Journal of Central South University (Science and Technology), 44, 4, pp. 1305-1311, (2013)

[7]

Li Y., Sun T., Kou J., Et al., Study on phosphorus removal of high-phosphorus oolitic hematite by coal-based direct reduction and magnetic separation, Mineral Processing and Extractive Metallurgy Review, 35, 1, pp. 66-73, (2014)

[8]

Mei X., Sun Z., Chen T., Thermodynamic analysis of sloid-state reaction during the process of coal-based direct reduction on iron-rich red mud, Light Metals, 7, pp. 8-12, (1994)

[9]

Mei X., Yuan M., Chen T., Characteristics of solid-state reaction during the process of coal-based direct reduction on refractory iron ore, The Chinese Journal of Nonferrous Metals, 5, 2, pp. 42-46, (1995)

[10]

Liu M., Studies on the foundamental and novel technology of Al-Fe separation of high-aluminium content iron ores based on the reduction method, pp. 34-46, (2010)

← 1 2 3 →