Efficient Preparation of Blast Furnace Burdens from Titanomagnetite Concentrate by Composite Agglomeration Process
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https://doi.org/10.1007/s11837-020-04480-2 Ó 2020 The Minerals, Metals & Materials Society
SINTERING OF OXIDES AND CONCENTRATES
Efficient Preparation of Blast Furnace Burdens from Titanomagnetite Concentrate by Composite Agglomeration Process TAO JIANG,1 LIANGPING XU,1 QIANG ZHONG ,1,2 CHEN LIU,1 HUIBO LIU,1 MINGJUN RAO,1 ZHIWEI PENG,1 and GUANGHUI LI1 1.—School of Minerals Processing and Bioengineering, Central University, Changsha 410083, Hunan, China. 2.—e-mail: [email protected]
South
Titanomagnetite concentrate is difficult to agglomerate by the traditional sintering process (TSP). In this study, the agglomeration properties of titanomagnetite concentrate were studied using the composite agglomeration process (CAP). It was shown that, by adding 40 wt.% pelletized feed, an excellent sinter with yield of 74.33%, a tumbler index of 58.93%, and productivity of 1.65 t (m2 h)1 were achieved, which were increased by 11.72%, 12.03%, and 37.16% compared with TSP, respectively. Meanwhile, for CAP, the solid fuel consumption was only 43.87 kgcoke/tproduct and the reduction disintegration index of RDI+3.15 was 73.53%. They were decreased by 6.34 kgcoke/tproduct and increased by 24.31%, respectively. The better product quality was mainly attributed to a larger proportion of calcium ferrite and silicoferrite of calcium and aluminum group minerals formed in CAP, which restrained the negative effect of perovskite on agglomeration in association with the matrix feed with ultra-high basicity. The results showed that CAP is an efficient method for agglomeration of titanomagnetite concentrate.
INTRODUCTION Titanium and vanadium are important in a number of applications, including energy storage1–3 and aeronautics.4 Most titanium and vanadium occurs in titanomagnetite ore,5,6 the mineral grade of which varies with the location of the deposits. In China, the concentration of TiO2 in titanomagnetite ore in the Panzhihua-xichang area of Sichuan province is over 10%,7 while the concentration in the Chengde area of Hebei province is below 5%.8 For the comprehensive utilization of iron, vanadium, and titanium in titanomagnetite ore, the sintering blast furnace (BF) ironmaking–converter steelmaking route has been widely applied. Sintering is the simplest, most effective, and commonly used method to agglomerate iron ore materials into a coarse competent feed from titanomagnetite ore for subsequent BF smelting.9 Over the past several
(Received August 2, 2020; accepted October 27, 2020)
years, many studies have revealed that there were different properties of sinter prepared from titanomagnetite ores because of their variable contents of TiO2.10,11 In general, with the increase of titanium content, the sintering properties are reduced. Controlling the basicity (w(CaO)/w(SiO2)) can effectively improve the low-temperature reduction performance, tumbling index, and yield of sinter.12,13 Currently, the mechanism of low-temperature reduction disintegration of titanium-bearing sinter is still not clear,14,15 although some solutions ha
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