Preparation of synthetic rutile via selective sulfation of ilmenite with (NH4)2SO4 followed by targeted removal of impurities

Weizao Liu; Xiaomei Wang; Zhenpu Lu; Hairong Yue; Bin Liang; Li Lü; Chun Li

doi:10.1016/j.cjche.2016.10.007

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Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities

Materials and Product Engineering | Updated：2026-01-06

- Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities
- Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities
- 中国化学工程学报（英文版） 2017年第6期页码：821-828
- Affiliations：
  
  College of Chemical Engineering, Sichuan University,Chengdu,China,610065
- Author bio：
- Funds：
  
  Supported by the National Key Projects for Fundamental Research and Development of China (2016YFB0600904).
- DOI：10.1016/j.cjche.2016.10.007
  中图分类号：
- 纸质出版：2017
- Accepted：
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Weizao Liu, Xiaomei Wang, Zhenpu Lu, 等. Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities[J]. 中国化学工程学报（英文版）, 2017,(6):821-828. DOI: 10.1016/j.cjche.2016.10.007.

Weizao Liu, Xiaomei Wang, Zhenpu Lu, et al. Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities[J]. Chinese Journal of Chemical Engineering, 2017, (6): 821-828. DOI: 10.1016/j.cjche.2016.10.007.
Weizao Liu, Xiaomei Wang, Zhenpu Lu, 等. Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities[J]. 中国化学工程学报（英文版）, 2017,(6):821-828. DOI: 10.1016/j.cjche.2016.10.007. DOI：

Weizao Liu, Xiaomei Wang, Zhenpu Lu, et al. Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities[J]. Chinese Journal of Chemical Engineering, 2017, (6): 821-828. DOI: 10.1016/j.cjche.2016.10.007. DOI：

摘要

Abstract

This paper describes a novel

facile chemical pathway for preparing synthetic rutile from ilmenite. The pathway consists of two primary units

i.e

selectively sulfating ilmenite

which was realized via roasting ilmenite with (NH

)

followed by selective thermal decomposition of the sulfated ilmenite

and targeted leaching of the impurities. The effects of the process parameters were systematically investigated. The results showed that the optimum sulfation conditions were a mass ratio of (NH

)

to ilmenite of 14

temperature of 360℃

and time of 120 min with a sulfation ratio of~95%. The optimum thermal decomposition conditions were 480℃ in N

atmosphere

and nearly all TiOSO

were decomposed with co-decomposition of FeSO

of 23%. For acid leaching

the optimum conditions were 2.5 wt% HCl

98℃ and 120 min. Under those conditions

94.2% iron was removed with a TiO

dissolution loss 1%. For alkali leaching

67% SiO

was removed in 5 wt% NaOH at 102℃ for 1 h. A synthetic rutile with a TiO

content 92 wt% and total MgO + CaO 1.5 wt% was obtained. Based on these results

a schematic flowsheet was proposed. Additionally

it was found that the decomposition of FeSO

mixed with TiOSO

under N

was inhibited due to its oxidation to a higher thermal stability Fe

(SO

)

by oxygen emitted from the decomposition of TiOSO

. At the same time

TiOSO

decomposition was promoted due to the immediate in situ consumption of oxygen by FeSO

. The synergetic effect might be responsible for the enhanced selectivity of sulfated ilmenite thermal decomposition.

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Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities

Preparation of synthetic rutile via selective sulfation of ilmenite with (NH₄)₂SO₄ followed by targeted removal of impurities

DOI：10.1016/j.cjche.2016.10.007

摘要

Abstract

关键词

Keywords

references