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高铬型钒钛磁铁矿是一种典型的多金属共伴生矿产资源,具有极高的综合利用价值。目前主要的冶炼流程为高炉—转炉。该工艺处理量大、生产规模大、技术成熟,但有价组元利用率低、资源浪费严重、环境负荷高。并且转底炉、回转窑等非高炉流程亦具有能耗高、钛渣品位低活性差等一系列缺点。基于气基竖炉直接还原的优越性,研发了高铬型钒钛矿氧化造块—气基竖炉直接还原—熔分新工艺。高铬型钒钛矿适宜氧化焙烧条件为1 300℃下焙烧20min;在1 100℃、V(H2)/V(CO)=5/2条件下还原35min,还原率达95%;最佳熔分条件为配碳比1.2,熔分温度1 650℃、熔分时间45min、CaF2配量2%(质量分数),碱度1.1。该种工艺下铁、钒、铬、钛收得率分别约为99%、98%、95%和95%,实现了有价组元的高效分离,是高铬型钒钛矿高效低碳综合利用的首选技术之一,为攀枝花钒钛矿的综合利用提供了参考。
High-chromium vanadium-titanium magnetite is a typical polymetallic co-associated mineral resources, with a very high value of comprehensive utilization. The main smelting process for the blast furnace - converter. The process of large capacity, large-scale production, technology is mature, but the use of valuable components low, serious waste of resources, high environmental load. And rotary hearth furnace, rotary kiln and other non-blast furnace processes also have a high energy consumption, titanium slag grade low activity and a series of shortcomings. Based on the superiority of the direct reduction of gas-fired shaft furnace, a new technology of direct reduction-melting of high-chromium vanadium-titanium oxide block-gas-fired shaft furnace was developed. The suitable conditions for the oxidation of high chromium type vanadium-titanium oxide are calcination at 1300 ℃ for 20min, and the reduction rate is 95% at 35 ℃ after V (H2) / V (CO) = 5/2 at 100 ℃. The conditions for the distribution of carbon with a ratio of 1.2, melting temperature of 1 650 ℃, melting time 45min, CaF2 2% (mass fraction), alkalinity 1.1. The yield of iron, vanadium, chromium and titanium in this kind of process is about 99%, 98%, 95% and 95%, respectively. It achieves the efficient separation of valuable components and is a high-efficiency and low-carbon synthesis of high- The use of one of the preferred technology for the comprehensive utilization of vanadium-titanium in Panzhihua provide a reference.