Behaviours of Zinc and Lead in Blast Furnace of Baotou Iron and Steel Group Co.

Abstract

The balance calculation of zinc and lead of No.1 BF of Baotou Iron and Steel Group Co. was performed in this research. The particle sizes of BF dusts were measured by LS230 laser particle size analyzer. The micrology of sinter and dusts were investigated with scanning electron microscopy (SEM, Hitachi S-3000) coupled with an energy-dispersive X-ray analysis (EDX). The results show that the general burdens of zinc and lead in No. 1 mainly came from sinter and pellet. The burdens of zinc and lead in No.1 BF were 645.45g/t and 370.33 g/t respectively, which were too much to need take some measures. Among the gas ash, the particle size of baghouse dust was minimal, but the contents of lead and zinc were highest. So the BF baghouse dust isn’t appropriate to recover as the sintering materials. The speciation of lead is PbO, PbCl3 and metallic Pb, but zinc never presents as metal in BF dusts.

Behavior of Chromium, Nickel, Lead, Zinc, Cadmium, and Mercury in the Blast Furnace—A Critical Review of Literature Data and Plant Investigations

“…Lead in the Outputs of the Blast Furnace. The distribution of lead to the different blast furnace outputs, according to the studies of Zhang et al, 47 Chernousov et al, 48 Morf, 46 and our own investigations is summarized in Table 2. The results of Chernousov et al 48 for plant II and plant III indicate that the largest portion of lead leaves the furnace via the HM (>66%).…”

“…From Table 2, it is evident that the imbalance is quite different among the studies considered. Zhang et al 47 and Chernousov et al 48 determined positive imbalances. This means that the total input of lead observed is larger than the total output.…”

“…Lead enters the blast furnace mainly in the form of the following compounds: PbO, PbS, and PbSO 4 , ,, whereby PbS and PbSO 4 predominate in the iron-bearing material. PbO in the input originates mainly from the dust of the top gas or sludge (in the case of a wet cleaning system) utilized in the sinter plant. ,, …”

“…Zhang et al 47 also published a zinc balance for a blast furnace. However, the top gas at this plant was cleaned by a dry cleaning system, whereas the other plants investigated were equipped with a wet dedusting system.…”

“…However, it must be noted that, although alternative reducing agents cause an additional input of lead, the overall amount of lead inserted into this furnace was low (∼20 g Pb/Mg HM), in comparison to other plants. For instance, Zhang et al 47 reported a total lead input of 370 g Pb/ Mg HM.…”