Thermodynamic Simulation of Silicon, Iron Reduction and Rundown of Zink, Lead in Systems of Zink-Limonite Ore – Carbon

Abstract

There were carried out theoretical research of thermodynamic simulation with regard to the systems Zink-Limonite ore of deposit Zhayrem (the Republic of Kazakhstan) – Carbon within the range of 1000–3000 K and pressure 0,001–0,1 MPa with the help of software solution «Astra», founded on the principle of maximum entropy. There was established that increase of reducing medium in the charging material leads to reducing of degree of silicon transition in elemental silicon (owing to increase of it transition in carbides), and at more less content of reducing medium there is increased part of silicon, that transits to SiO, at practically full absence of reduced elemental Si. Under decreasing of pressure in the system from 0,1 to 0,001 MPa there is decreases temperature of full transition of zink (1500–1200 K), lead (1900–1500 K) and temperature of the start of silicon formation
(2300–1900 K). Under Р = 0,001 MPa substantial (more than 50 %) elemental silicon formation could be attain at Т ≈ 2450 K.