Lead-zinc phase diagram

Abstract In the beginning, the mixed potential model, which is generally used to explain the adsorption of collectors on the sulphide minerals, is illustrated. And the collector flotation of several kinds of minerals such as copper sulphide minerals, lead sulphide minerals, zinc sulphide minerals and iron sulphide minerals is discussed in the aspect of pulp potential and the nature of hydrophobic entity is concluded from the dependence of flotation on pulp potential. In the following section, the electrochemical phase diagrams for butyl xanthate/water system and chalcocite/oxygen/xanthate system are all demonstrated from which some useful information about the hydrophobic species are obtained. And some instrumental methods including UV analysis, FTIR analysis and XPS analysis can also be used to investigated sulphide mineral-thio-collector sytem. And some examples about that are listed in the last part of this chapter. 

The problem occuring in zinc antimony materials is due to difficulties in the crystal growth of materials. Having initially a high figure of mait, those T.E. materials could have better properties with some achievement in the metallu cal processes (15). These difficulties are easily understood by a complicated phase diagram. Up to our recent paper (16) die Afferent phase equilibria determinations lead to six different ersions of this phase diagram. These differences were due to real difficulties in the phase stabilities and consequenUy to the phase equilibria determination. 

As shown in the zinc-silver phase diagram in Figure 12.9, there are five identified solid phases. The extremes a and r are solids solutions and there are three intermetallic compounds p, y and e. In practice the addition of molten zinc to lead bullion followed by cooling will result in the formation of these intermetaUics as solid precipitates, which are mainly of the e form but also contain r] towards the... 

FIGURE 4.40 A schematic phase diagram for a zinc-tin-lead system. (Redrawn from Shchukin, E.D. et al., Doklady AN SSSR, 160, 1355, 1965.)... 

Fig. 3.6. (a) The copper-nickel diagram is a good deal simpler than the lead-tin one, largely because copper and nickel are completely soluble in one another in the solid state. (b) The copper-zinc diagram is much more involved than the lead-tin one, largely because there are extra (intermediate) phases in between the end (terminal] phases. However, it is still an assembly of single-phase and two-phase fields. 

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