碳含量对含钛高炉渣钠化反应的影响
本文通过热力学计算，分析了含钛高炉渣钠化可行性，热力学计算结果表明：在高于碳酸钠熔点851℃低于1150℃的温度范围内进行含钛高炉渣的钠化反应是可行的。
采用渣碱共熔法对含钛高炉渣进行钠化实验研究，实验方案如下：将含钛高炉渣、固态碳酸钠，并加入不同含量的煤粉在一定温度下进行钠化反应，钠化产物主要有偏铝酸钠、硅酸钠和偏钛酸钠，将反应后的共熔渣破碎研磨后溶于去离子水中，经搅拌充分溶解后过滤，滤渣经过多次水洗后，再加稀盐酸酸解滤渣，偏钛酸钠溶于稀盐酸进入溶液，通过电感耦合等离子体发射光谱法测定酸解液中钛离子含量，进而测定经钠化后试样中偏钛酸钠的含量，并计算试样中钛的钠化率。实验研究表明：碳可以促进含钛高炉渣的钠化，随着碳含量的增加，含钛高炉渣的钠化率随之增加，本实验在含钛高炉渣在粒径d0为200目，反应温度为1150℃，反应时间为2小时的条件下，当碳含量达到12%左右时，含钛高炉渣的钠化率达到78%并维持稳定状态。87363
毕业论文关键词：含钛高炉渣；热力学；钠化；酸浸
Abstract Vanadium titano-magnetite generates lots of titaniferous blast furnace slags as blast furnace ironmaking raw material after smelted。 Recycling economy of titanium is undesirable。 Thus, lots of blast furnace slags are wasted。
Sodium modification feasibility of titaniferous blast furnace slag is analyzed through thermodynamic calculation。 According to the result of thermodynamic calculation, it indicates: the sodium modification reaction of titaniferous blast furnace slag is feasible under temperature of 1150℃ when the melting point of sodium carbonate is higher than 851℃。
The empirical study on sodium modification of titaniferous blast furnace slag is carried out through congruent melting of phosphorous slag。 The experimental scheme is as below: add coal dust of different contents into titaniferous blast furnace slag and solid sodium carbonate into to realize sodium modification reaction under certain temperature。 Sodium modification products mainly include sodium metaaluminate, sodium silicate, metatitanic acid, then solve the reacted eutectic slag crushing into deionized water, filter it after stirring fully to be dissolved, and then add diluted hydrochloric acid to realize acidolysis of filter residue after rinsing the filter residue for many times。 After metatitanic sodium titanate is dissolved into diluted hydrochloric acid to get solution, measure the content of titanium ion in acidolysis solution through inductive coupling plasma emission spectroscopy to further measure the content of metatitanic sodium titanate in test samples through sodium modification and calculate the sodium rate of titanium in the test samples。 According to the experimental study, it manifests that carbon can facilitate the sodium modification of titaniferous blast furnace slag。 Along with the increase of carbon content, the sodium rate of titanium blast furnace slag will be increased。 In this experiment, under the conditions of titaniferous blast furnace slag particle size d0 is 200 mesh, the reaction temperature is 1150℃ and the reaction time is 2 hours, when the carbon content reaches around 12%, the sodium rate of titaniferous blast furnace slag will reach 78% and at stable state。
Keywords: titaniferous blast furnace slag; thermodynamics; sodium modification; acid leaching。
目 录
第一章 绪论 1
1。1 钛资源概述 1
1。1。1 钛资源综述 1