【摘要】 为解决实际生产中煤矸石中和渣固化-酸化一体化操作物料固化固结强度高、转移困难等问题,本研究以贵州盘州中试煤矸石中和渣为原料,以98酸为酸浸介质,以溶出率为主要指标,将以往"高温酸化→转移→溶出"的技术路线改为"低温固化→转移→高温酸化→溶出",并结合XRD、SEM表征手段探明中和渣固化反应机理。结果表明:50℃下固化体形态在第3天时达到终凝,酸化温度170℃、酸化时间4 h、酸化酸渣比1. 2∶1、溶出液固比4∶1、溶出时间60 min、溶出温度80℃,中和渣中有价元素溶出率分别为:钛82. 63%、铁96. 48%、铝98. 33%、钙87. 72%、镁95. 31%,酸渣中Si O2质量分数> 96%,该技术路线解决了物料转移难的问题,同时酸溶物溶出高,实现了酸渣富硅除杂。更多还原

【Abstract】 In order to solve the problems of high solidification,consolidation strength and difficult transfer of coal gangue neutralization slag solidification-acidification integrated operation materials in actual production,Guizhou coal gangue neutralization slag was used as raw material,98% concentrated sulfuric acid as acid leaching medium,and the dissolution rate as the main index. The previous technical route of "high-temperature acidification→transfer→dissolution"was changed to "low-temperature curing→transfer→high-temperature acidification→dissolution",and curing reaction mechanism was determined by XRD and SEM characterization methods. The results show that the solidification morphology reaches the final condensation on the third day at 50 ℃,the acidification temperature is170 ℃,the acidification time is 4 h,the acidified acid slag ratio is 1. 2 ∶ 1,the dissolution ratio is 4 ∶ 1,the dissolution time is 60 min,and the dissolution temperature is 80 ℃. The titanium dissolution rate of valuable elements in the neutralization slag is 82. 63%,iron 96. 48%,aluminum 98. 33%,calcium 87. 72%,magnesium 95. 31%,respectively. The mass fraction of SiO2 in the acid slag is > 96%. This technical route not only solves the problem of material transfer,but also increases the dissolution rate of acid-soluble substance. The silicon enrichment and impurity removal of the acid residue are achieved.更多还原