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在温度1473～1573K,氧分压10~(-8)atm·及Fe/SiO_2=1.34的条件下,通过渣和铜-钴合金的平衡,测定了钴在铜熔炼渣中的溶解度。由通过已知体积的CO和CO_2混合气体来控制熔体上的氧势。结果证明:氧化钴的活度系数随着温度的提高而减小,关系式为:L_ar°_(C·O)=19.63-1.298×10~(-2)T 钴的分配系数随着温度的提高而增大,关系式如下L_aR=1.568×10(~-2)T-19.16 这些结果与Reddy和HealyF以前测定的铜精炼渣的数据进行了比较。钴的分配系数,对熔炼渣来说由1473K的50增加到1573K的240,对于精炼渣则由1473K的208增加到1573K的235。氧化钴的活度系数,对熔炼渣由1473K的1.65减小到1573K的0.45,而对于精炼渣则由1473K的0.516减小到1573K的0.295。结论是:钴在熔炼渣中的溶解度比在精炼渣中要低。
The solubility of cobalt in copper smelting slag was determined by the balance of slag and copper-cobalt alloy at the temperature of 1473-1573K, partial pressure of oxygen of 10-8M and Fe / SiO 2 = 1.34. The oxygen potential on the melt is controlled by passing a known volume of CO and CO 2 gas mixture. The results show that the activity coefficient of cobalt oxide decreases with the increase of temperature, the relation is: L_ar ° _ (C · O) = 19.63-1.298 × 10 ~ (-2) T The distribution coefficient of cobalt varies with temperature With the following relationship: L_aR = 1.568 × 10 (-2) T-19.16 These results are compared with those of the copper refining slag previously determined by Reddy and HealyF. The cobalt partition coefficient increased from 50 for 1473K to 1573K for smelting slag, and from 208 for 1473K to 235 for 1573K for refining slag. Activity coefficients for cobalt oxide decreased from 1.65 at 1473 K to 0.45 at 1573 K for smelting slag and from 0.250 at 1473 K to 0.295 at 1573 K for refining slag. The conclusion is that the solubility of cobalt in smelting slag is lower than that in refining slag.