The occurrence form of iron impurities and pickling modification in titanium gypsum
WEN Weikang
ZHU Sai
ZHANG Mingtao
HUANG Jing
ZHAO Min
FAN Puyue
Abstract：This paper conducts a systematic analysis of the occurrence form of iron impurities in titanium gypsum and under-takes an in-depth study on the impurity removal efficiency of iron impurities through the pickling process.Meanwhile,the impact of pickling purification on the performance of titanium building gypsum is studied.The results indicate that the iron impurities within titanium gypsum predominantly exist in the form of amorphous Fe(OH)3.As the concentration of the acid solution and tem-perature rise,the leaching rate of iron impurities gradually ascends.The optimal parameters for the impurity removal process are a citric acid solution concentration of 20%and a reaction temperature of 80℃,with the leaching rate of iron impurities being as high as over 94.7%.The whiteness increases to 67.3%,and pickling essentially has no impact on the crystal morphology of titani-um gypsum.After purification,the water requirement of normal consistency of calcined titanium building gypsum is reduced to 0.70,and the increase in absolute dry bending and compressive strength of hardened 1 d is 52.9%and 87.1%respectively.
Keywords：titanium gypsumiron impurityimpurity occurrence formpickling modificationperformances influences
Publication Date：2025-11-25
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：5( 95-99 )