|Table of Contents|

Leaching of High-Ti-Bearing Blast-Furnace Slag Directly in Hydrochloric Acid(PDF)

南京师范大学学报(工程技术版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2012年02期
Page:
43-49
Research Field:
Publishing date:

Info

Title:
Leaching of High-Ti-Bearing Blast-Furnace Slag Directly in Hydrochloric Acid
Author(s):
Jia Feng1Liu Rong12Yang Ming3
1.School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China
Keywords:
Ti-bearing blast-furnace slaghydrochloric acid leaching acid leaching residue orthogonal test method
PACS:
X758
DOI:
-
Abstract:
Based on the reactive differences of titan and other elements to hydrochloric acid, the Ti-bearing blast-furnace slag was leached directly with hydrochloric acid in different conditions. The effect of the particle size,heating temperature, the ratio of acid and slag,hydrochloric acid concentration and reactive time on the mass fraction of acid leaching slag were analyzed. Moreover,Orthogonal Test Method was used to identify the optimal reaction conditions and the order of influencing factor. The experimental results show that Mg、Fe、Al were acid-splitting entirely,and the acid leaching residue can be obtained with over 45% TiO2 at the conditions that the particle size is of 120 ~ 180 μm,heating temperature is of 95℃, the ratio of acid and slag is of 1. 5∶ 1,hydrochloric acid concentration is of 8 mol /L and reactive time is of 4 h, the titania mainly consists in unreacted CaTiO3 and H2TiO3 by representational analysis. After four hours, the percentage of TiO2 showed no significant changes due to lower reactivity of the perovskite and the coverage of silicic acid from the acidolysis of diopside. The dissolution rate of differently phase compositions in slag descended in the following order of spinel diopside and perovskite.

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Last Update: 2013-03-11