Preparation process of cold bonded pellets with iron-bearing dust and sludge from steel production process

Blast furnace dust (BFD) and converter sludge (CS) were used as raw materials for preparing of cold bonded pellets (CBPs). The results showed that BFD contained high content of C, Fe and harmful element of Zn. Conversely, the CS had more Fe and Ca content and less Zn. BFD particles are mostly large and irregular in shape with poor hydrophilicity, whereas CS particles are generally smaller spherical and could bond together easily. Additionally, the main factors influencing the performance of CBPs are the binder, moisture, and pressing pressure. By controlling the mixing ratio of BFD and CS, selecting the appropriate binder and binder amount, and controlling the moisture and pressure, CBPs with a compressive strength and a falling strength of up to 142.7 N and 8.34 times, respectively, can be prepared, thus meeting the requirements of the rotary hearth furnace and the OxyCup production process.

[1]  Zheng-jian Liu,et al.  Effect of organic binders on the activation and properties of indurated magnetite pellets , 2021, International Journal of Minerals, Metallurgy and Materials.

[2]  X. She,et al.  Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace , 2021, International Journal of Minerals, Metallurgy and Materials.

[3]  Chuan Wang,et al.  Influence mechanism of alkali metals on CO2 gasification properties of metallurgical coke , 2020 .

[4]  F. Shen,et al.  Effects of MgO additive on metallurgical properties of fluxed-pellet , 2019, Journal of Central South University.

[5]  Aijun Teng,et al.  Influence of blast furnace top gas composition and dust on HCl removal with low temperature Ca-based dechlorination agent , 2018, Journal of Central South University.

[6]  C. Lanzerstorfer.  Characterization of dust from blast furnace cast house de-dusting , 2017, Environmental technology.

[7]  C. Lanzerstorfer,et al.  Characterization of sintering dust collected in the various fields of the electrostatic precipitator , 2016, Environmental technology.

[8]  Bo Björkman,et al.  Off-gas dust in an experimental blast furnace : Part 1: Characterization of flue dust, sludge and shaft fines , 2010 .

[9]  V. N. Misra,et al.  An overview of utilization of slag and sludge from steel industries , 2007 .

[10]  B. Hallstedt,et al.  Semi-solid Processing of Alloys: Principles, Thermodynamic Selection Criteria, Applicability , 2006 .

[11]  Dieter Senk,et al.  Dust Injection in Iron and Steel Metallurgy , 2006 .

[12]  Hannu Makkonen,et al.  Optimisation of steel plant recycling in Finland: dusts, scales and sludge , 2002 .

[13]  S. Mikhail,et al.  Thermal reduction of steel-making secondary materials. I. Basic-oxygen-furnace dust , 1998 .

[14]  Jianliang Zhang,et al.  Effects of an inorganic binder on the strength property of cold-bonded pellets , 2017 .

[15]  M. B. Mansur,et al.  Selective removal of zinc from basic oxygen furnace sludges , 2012 .

[16]  Hiroshi Oda,et al.  Dust Recycling System by the Rotary Hearth Furnace , 2006 .

[17]  R. Kandiyoti,et al.  The Fate of Volatiles from Injectant Coals and Soot Formation in Blast Furnaces , 2004 .