基于响应面分析方法的石煤草酸浸出体系优化研究

his study developed a clean and efficient oxalic acid leaching process for vanadium extraction from vanadium-bearing stone coal, employing Response Surface Methodology (RSM) to optimize leaching parameters. Single-factor experiments initially revealed the influence patterns of oxalic acid concentration, liquid-to-solid ratio, temperature, and time on vanadium leaching efficiency. A four-factor three-level Box-Behnken experimental design was subsequently established. Experimental results demonstrated that oxalic acid concentration and leaching temperature exerted the most significant effects on vanadium recovery. The constructed quadratic polynomial model exhibited a determination coefficient (R2=0.9878), confirming model reliability. Optimized conditions were determined as: temperature 137.42 ℃, duration 4.22 h, oxalic acid concentration 12.29 wt.%, and liquid-to-solid ratio 2.72 mL/g, achieving a predicted vanadium leaching rate of 99.63%. Practical verification yielded an average leaching rate of 98.26% with merely 1.37% deviation. This methodology effectively addresses the severe pollution issues associated with traditional sulfuric acid systems, providing an environmentally friendly and high-efficiency technical solution for vanadium extraction from stone coal.