Effect of nickel oxide additive on smelting mechanism of chromium-bearing vanadium titanomagnetite pellets

• Published in: Transactions of Nonferrous Metals Society of China Vol. 31; no. 8; pp. 2501 - 2510
• Main Authors: CHENG, Gong-jin, TANG, Wei-dong, XUE, Xiang-xin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2021
• Subjects: chromium-bearing vanadium titanomagnetite pellets; nickel–iron alloy; slag structure; smelting mechanism; smelting mechanism; nickel–iron alloy; chromium-bearing vanadium titanomagnetite pellets; slag structure
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(21)65670-4

The effect of nickel oxide additive on the smelting behaviors of chromium-bearing vanadium titanomagnetite pellets (CVTP) was investigated while analyzing the transfer behavior of nickel in iron and slag. The results show that when NiO added to CVTP increases from 0 to 6 wt.%, softening start temperature increases from 1148 to 1212 °C, and the softening end temperature increases from 1280 to 1334 °C; the melting start temperature increases from 1318 to 1377 °C, and the dripping temperature decreases from 1558 to 1521 °C. The pig iron comprises a compound of Fe–Ni–C. The slag structure depolymerizes with increasing nickel addition. The softening-melting behaviors of CVTP, the reduction of nickel into pig iron, and the depolymerization of slag structure indicate the feasibility of producing nickel–iron alloy through the blast furnace process.