计算机辅助研究高温冶金的热力学行为——Ⅱ.用PSTP系统研究“SKS”法处理含砷金硫精矿的热力学行为

COMPUTER AIDED STUDY ON THERMODYNAMICS FOR PYROMETULLURGICAL PROCESS Ⅱ. USING PSTP TO PROCESS THE AS-BEARING GOLD ORES

本文以水口山的铅精矿和硫精矿的混合矿为原料,用我们现有的工程化学数据库(ECDB)及新建立的高温冶金过程热力学程序系统(PSTP),对“SKS”法处理含砷金硫精矿的冶金过程进行了热力学研究。通过计算,研究了各相组成尤其是砷分布受各种参数如氧化气氛、渣型、富氧量、温度及还原气氛等的影响,从而给出了最佳原料配比、最佳操作条件及其结果。 1.铅精矿与硫精矿的最佳配比为1:1;2.氧化段:温度1050℃,SiO_2:FeO:CaO=1:1.47:0.10,氧气平衡分压0.10 atm,富氧量O_2/Air=1.5。每吨混合物料供纯氧气0.558 m^3,空气0.372 m^3;3.还原段:温度1050℃;P(CO)/P(CO_2)=1.0,加入还原剂碳46.745kg,鼓入空气0.196 m^3;4.进料中84.81％Pb,7.57％Fe被还原,金、银全部进入金属铅液相,整个过程中挥发到气相的砷占其总量的21.81％,渣相固砷率达到78.19％。

The thermodynamic behaviors of As-bearing gold ores in pyrometallurgical process were evaluated by using our new generalized computer aided system PSTP. The optimum operating condition recommended by this system was described condisely as follows:1. The optimum burden of the two ores is 1:1; 2. For oxidizing process: T=1050℃, SiO : FeO: CaO=1.0 : 1.468 : 0.103, partial pressure of oxygen P(O_2) = 0.10 atm, the oxygen enrichment in blowing gas O_2/Air=1.5. It required 0.558 m^3 oxygen and 0.372 m^3 air for one ton mixed ores; 3. For reducing process : T=1050℃, P(CO)/P(CO_2)=1.0. It required 0.196 m^3 air and 46.745 kg carbon; 4. About 84.81% Pb, 7.57% Fe in the input feed were reduced, gold and silver could be totally extracted by lead, 21.8% arsenic was volatilized into gas phase.