响应曲面法优化褐铁矿精矿回收率工艺参数的研究  

Optimization of Processing Parameters by Response Surface Methodology for Increasing Iron Recovery into Limonite Concentrate

作　　者：冯艳虎 庄故章[1] 周平[1] 武丹宇 FENG Yan-hu;ZHUANG Gu-zhang;ZHOU Ping;WU Dan-yu(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《矿冶工程》2022年第4期120-124,共5页Mining and Metallurgical Engineering

基　　金：昆明理工大学分析测试基金(2018M20172201113)。

摘　　要：针对老挝某难选褐铁矿,采用“还原焙烧-弱磁选”工艺流程选铁,首先进行了原矿还原焙烧单因素试验,研究了焙烧温度、焙烧时间和碳粉用量对精矿品位及回收率的影响,结果表明,原矿经充分还原焙烧后磁选,铁精矿铁品位均达到61%以上。在单因素试验基础上,借助响应曲面法建立模型设计实验方案,对还原焙烧工艺参数进行优化,探讨三因素交互作用对精矿回收率的影响,得到优化后的还原焙烧工艺条件为:焙烧温度873℃、焙烧时间75 min和碳粉用量2 g(相对50 g原矿),在优化条件下进行验证试验,精矿回收率达到91.99%。验证试验结果表明,实际试验值与优化预测结果相差1.09%,该试验模型可信度较高。Aiming at a kind of refractory limonite ore in Laos, a processing technique consisting of reduction roasting and low intensity magnetic separation was adopted in experiments for iron recovery. Firstly, a single factor experiment on reduction roasting of raw ore was performed, and the effects of roasting time and temperature, as well as dosage of carbon powder on the grade and recovery of the concentrate were explored. Results showed that the raw ore was subjected to a full reduction roasting process followed by magnetic separation, resulting in the obtained iron concentrate with grade exceeding 61%. After the experiment, a model was established by using response surface methodology for the design of experiment scheme, and the processing parameters of reduction roasting were optimized. Based on the effects of interaction of three factors on the iron recovery into the concentrate, the processing parameters for reduction roasting process were optimized as follows: roasting at 873 ℃ for 75 min, with the carbon powder at the dosage of 2 g(corresponding to 50 g raw ore). A verification experiment was performed with the optimized processing parameters, resulting in the obtained concentrate with recovery rate up to 91.99%. It is shown that percentage deviation between the experimental results and the predicted value is 1.09%, indicating that this experimental model has high credibility.

关 键 词：褐铁矿 还原焙烧 响应曲面法 热分析 

分 类 号：TD981[矿业工程—选矿]