XU Yanxia, SONG Xingfu, LI Zongyun, et al. High efficient recycling of titanium from waste residue of ilmenite by acid hydrolysis through DTB device[J]. CIESC Journal, 2016, 67(10): 4211-4218.
XU Yanxia, SONG Xingfu, LI Zongyun, et al. High efficient recycling of titanium from waste residue of ilmenite by acid hydrolysis through DTB device[J]. CIESC Journal, 2016, 67(10): 4211-4218.DOI: 10.11949/j.issn.0438-1157.20151997.
China is the world's largest producer of titanium dioxide by sulfuric acid
and currently accumulates over million tons of by-products as acid tailings. Those acid tailings caused waste of resources and serious environment pollution problems without utilization because there are lots of more than 25 μm particles of titanium ore in those tailings. On the sedimentation experiments
good settling properties of particles are found. The hindered settling velocity of the particles of 25 μm is 0.60 mm·s-1 based on equations of hindered settling velocity. The DTB (draft tube babbled) type separator has been designed to separate waste residue and recycle titanium
based on analysis of flow field
sedimentation and beneficiation. The separator structure and process operation parameters are also optimized. The results show that there are little more than 25 μm titanium ore in the overflow from vortex finder. The purity of titanium for recycling can reach 27%
and recovery rate of titanium is 73% under the optimal conditions. The results provide the basic data for the industrial recycling of titanium dioxide from acid tailings.