钛精矿酸解尾气中升华硫的产生规律及其减排方法  

Formation rules and emission reduction method of sublimed sulfur in acidolysis exhaust gas of titanium concentrate

作　　者：向泉锦 全学军[2] 李礼 王海波 陈新红 李平 XIANG Quanjin;QUAN Xuejun;LI Li;WANG Haibo;CHEN Xinhong;LI Ping(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China;School of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China;Panzhihua Steel Group Chongqing Titanium Industry Co.,Ltd.,Chongqing 400054,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]重庆理工大学化学化工学院,重庆400054 [3]攀钢集团重庆钛业有限公司,重庆400054

出　　处：《无机盐工业》2024年第7期96-103,134,共9页Inorganic Chemicals Industry

基　　金：钒钛资源综合利用国家重点实验室开放基金课题(2022P4FZG10A)。

摘　　要：钛精矿的酸解是硫酸法钛白生产的重要环节,然而酸解尾气中单质硫降温冷凝所形成的升华硫极易堵塞排气管道系统,严重影响了钛白粉的正常生产。因此,系统地研究升华硫减排对实现硫酸法钛白连续生产具有十分重要的理论和现实意义。该工作对钛精矿中硫的赋存状态进行了表征分析,探讨了酸解尾气中升华硫的产生机制并通过实验探究了升华硫产生量的变化规律。结果表明,尾气中的升华硫主要是由钛精矿中的磁黄铁矿与浓硫酸发生反应生成,反应时间、反应温度、反应酸浓度等工艺参数都会影响升华硫的产生量。同时发现,增加酸解物料中的空气含量能在不影响钛精矿酸解率的前提下降低升华硫的产生量。实验结果表明,当反应时间为30 min、反应温度为180℃、搅拌速率为100 r/min、反应酸浓度为85%(质量分数)、矿物粒径为48~75μm、物料中空气流速为80 mL/min时,酸解尾气中升华硫的质量减少了35%以上。Acidolysis of titanium concentrate is a key step in manufacturing the titanium dioxide by sulfate process.However,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 theoretical and practical significance to systematically study the emission reduction of sublimed sulfur production for the continuous 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 reduce 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 concentration of reactive acid was 85%,the particle size of mineral was 48~75μm,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%.

关 键 词：酸解尾气 升华硫 钛精矿 硫酸法钛白 

分 类 号：TQ134.11[化学工程—无机化工]