Potentialities of Simultaneous Removal of Tin and Copper from Molten Iron through Evaporation

Abstract

The Knudsen-cell mass spectrometry was used to study evaporation and thermodynamics of pure liquid Sn, Fe-Sn and Fe-Cu-Sn molten alloys containing up to 20.3 mol% Sn or up to 5 mol% Cu and Sn in a wide temperature range. The thermodynamic properties of the binary melt were approximated by means of the subregular solution model with temperature dependent parameters. The properties of the ternary melt were represented with accuracy not worse than the experimental one by combination of the characteristics of the binary constituents. The obtained results were applied to assessment of the potentialities of simultaneous copper and tin removal from molten steel by means of evaporation. Combination of vacuum treatment of a 160-tons ladle with blowing through the molten metal neutral gases was considered as an example. Two processes are responsible for removal of copper and tin: transfer into gas bubbles, free-rising from the ladle bottom to its surface, and evaporation from molten metal surface, turbulized by blowing-through gas. It was shown that duration of the treatment necessary for a decrease in Cu concentration from 0.6 to 0.3 wt% amounts to ϳ1.5 h and is not practically affected by variations in tin content in the range of 0.01 to 0.6 wt%. During this time concentration of tin changes insignificantly at any initial content: from 0.6 to ϳ0.51, from 0.1 to ϳ0.086 or from 0.01 to ϳ0.0086 wt%.

Evaporation of the tramp element antimony from molten steel under reduced pressure treatment

“…According to other studies [24][25][26][27], during reduced pressure treatment, the evaporation forms of the tramp elements Cu and Sn from molten iron or steel containing a high S content are primarily CuS (g) and SnS (g) , and the evaporation is a second-order reaction. Moreover, when the S content in molten iron or steel is low, the evaporations of Cu and Sn are a first-order reaction, and their evaporation forms are mainly Cu (g) and Sn (g) .…”

Removal of Residual Element Tin in the Ferrous Metallurgy Process: A Review

“…Nevertheless, Zaitsev et al [61] indicated that the efficiency of removing tin by vapor pressure processes is low. At the same time, if the vapor pressure process is used in actual production, the pressure in the furnace should be kept low.…”

Adsorptive removal of Cu(II) from aqueous solutions using collagen-tannin resin

“…Conventional methods for the removal of heavy metal ions from solutions include chemical precipitation [4], ion exchange [5], electrochemical treatment [6], membrane technology [7] and evaporation [8]. However, most of these methods have no selectivity when used in practice and have the disadvantage of high operating cost and more volume of sludge [9].…”