OPTIMIZATION OF PROCESSING PARAMETERS USING RESPONSE SURFACE METHODOLOGY FOR MICROWAVE DIRECT REDUCTION OF TITANIC IRON ORE

摘要

On the basis of single factor tests, using the response surface method, we did an optimization study of the technological parameters for microwave carbon thermal direct reduction of titanic iron ore used as an electrode coating material. In this experiment, in a microwave power 3kw-box type high-temperature reactor, we used anthracite coal and wood charcoal as a reducing agent, which improved the reduction rate and reduced the amount of impurities, and used Na2CO3 (AR) as an additive (anthracite coal: wood charcoal: Na2CO3=10:3:3), which had reinforcement in the reaction. The response surface analysis results demonstrate a significant correlation among temperature reduction time, composite reductive dosing and reduction rate. By contenting the index requirements for the product reduction rate and reducing energy consumption as much as possible, through the typical analysis, we obtained the best conditions for reduction: reduction temperature 1150°, reduction time 80 min and compounding reductive dosing 15%. In the actual experiments, the reduction rate is (95±2)%. The experimental results show that compared with traditional methods, microwave direct reducing titanic iron ore for electrode coating material is highly efficient and environmentally friendly.