Formation rules and emission reduction method of sublimed sulfur in acidolysis exhaust gas of titanium concentrate
Acidolysis of titanium concentrate is a key step in manufacturing the titanium dioxide by sulfate process.How-ever,the sublimed sulfur formed by the cooling and condensation of elemental sulfur in the acidolysis exhaust gas is easy to clog on the exhaust pipe,which seriously affects the normal production of titanium dioxide.Therefore,it is of great theoreti-cal and practical significance to systematically study the emission reduction of sublimed sulfur production for the continu-ous manufacture of titanium dioxide by sulfate process.In this work,the occurrence state of S in titanium concentrate was characterized and analyzed.The production mechanism of sublimed sulfur in acidolysis exhaust gas was discussed,and the change laws of sublimed sulfur production were explored through experiments.The results showed that sublimed sulfur in the exhaust gas was mainly formed by reaction between pyrrhotite in titanium concentrate and concentrated sulfuric acid,and the manufacture parameters such as reaction time,reaction temperature and sulfuric acid concentration could affect the weight of sublimed sulfur.At the same time,it was found that increasing the air content in the acidolysis material could re-duce the production of sublimed sulfur without affecting the acidolysis rate of titanium concentrate.The experiments showed that when the reaction time was 30 min,the reaction temperature was 180℃,the stirring rate was 100 r/min,the concentra-tion of reactive acid was 85%,the particle size of mineral was 48～75 µm,and the air flow rate in the material was 80 mL/min,the weight of sublimed sulfur in acidolysis exhaust gas was reduced by more than 35% .
acidolysis exhaust gassublimed sulfurtitanium concentratetitanium dioxide of sulfate process
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