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利用熔融还原法进行了闪速炉水淬镍渣提铁的实验研究,探讨了熔渣二元碱度、反应温度和反应时间对提铁效果的影响.XRD测试结果表明水淬镍渣由正硅酸铁FeO.SiO2和玻璃态物质组成.镍渣中的氧化铁主要以FeO.SiO2的形式存在,通过常规的选矿方法很难实现铁氧化物的富集,故采用熔融还原方法进行镍渣提铁实验.实验结果表明增加配合料中CaO的加入量、提高反应温度以及延长熔制时间都能不同程度地提高镍渣中铁的还原率.通过比较1450～1600℃范围内各反应温度下不同类型还原反应的Gibbs自由能,镍渣熔融还原过程的主要反应形式为(FeO)+C(S)→[Fe]+CO.本实验确定的最佳配方组成为:镍渣100g、CaO34.7g、CaF24.04g和焦炭8.5g;最佳反应条件为1500℃熔制180min.以上条件下的渣铁分离效果较好,铁还原率达到96.32%.
The effect of slag alkalinity, reaction temperature and reaction time on iron extraction was studied by means of smelting reduction method.Experimental results of XRD show that the water quenched nickel slag is positive Iron silicate FeO.SiO2 and vitreous material composition.Metal iron oxide in the main form of FeO.SiO2 exists through the conventional beneficiation method is difficult to achieve iron oxide enrichment, so the use of molten reduction method for nickel slag The experiment results show that increasing the amount of CaO added in the batch, increasing the reaction temperature and prolonging the melting time can all improve the reduction rate of iron in nickel slag to some extent.Comparing the reaction temperature in 1450-1600 ℃, The Gibbs free energy of the type reduction reaction, the main reaction form of the molten slag reduction process for the nickel (FeO) + C (S) → [Fe] + CO. The best recipe to determine the composition of this experiment: nickel slag 100g, CaO34.7g , 24.04g of CaF and 8.5g of coke, the optimal reaction conditions were melting at 1500 ℃ for 180min, the separation of slag and iron was better under the above conditions, and the iron reduction rate reached 96.32%.