基于响应曲面法高效浸出煤矸石中钛的工艺优化

Optimization of High-efficiency Leaching of Titanium from Coal Gangue with Response Surface Method

为提高煤矸石中有价元素综合利用效率,采用微波技术从煤矸石中提取有价元素钛。考察了微波强化下浸出钛的主要影响因素,利用响应曲面法优化了浸出工艺。结果表明,钛的较佳提取条件为微波功率830W,液固比1.56:1,反应时间1.43 h,钛的浸出率达到83.91%。响应曲面优化设计结果分析表明,模型的显著性好,准确度高,实际值与预测值的相对误差为0.73%,可用模型分析预测微波强化浸出煤矸石中钛的较佳浸出工艺,具有一定的实用价值和意义。采用X射线衍射和扫描电镜对固相反应产物和酸浸渣的物相组成与微观形貌进行表征分析,反映了微波强化固相反应对煤矸石中钛的浸出效果良好。

In order to improve the comprehensive utilization efficiency of valuable elements in coal gangue,the microwave technology was used to extract valuable element titanium from coal gangue.The main influencing factors of solid-phase leaching under microwave strengthening conditions were investigated.And the solid-phase leaching process was optimized by response surface methodology(RSM).Results showed that the optimal extraction conditions of titanium:microwave power 830 W,liquid-solid ratio 1.56:1,reaction time 1.43 h,under this condition the leaching rate of titanium reached 83.91%.Analysis of response surface optimization design results shows that the model has good saliency and high accuracy.Model analysis can be used to predict the best leaching process of the microwave strengthen field leaching of titanium from coal gangue,the error of 0.73%between the predicted and experimental values,which has certain practical value and significance.X-ray diffraction and scanning electron microscopy were used to characterize and analyze the phase composition and microscopic morphology of the solid phase reaction products and acid leaching residue,which proved that the microwave strengthens solid-phase reaction had a good leaching effect.