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分析了“碳热法”生产硅钙钡合金工艺中,使用重晶石(BaSO4)作为钡原料造成产品硫含量波动的主要原因。理化检测结果表明,硅钙钡合金中的硫主要以硫化物或复杂硫氧化物的形式存在。热力学计算初步判断,硫酸钡碳热还原过程主要以液-固反应的方式进行,由此造成部分比重大于Si-Ca-Ba合金的硫化物或硫氧化物滞留在最终产品中。
The main reason for the fluctuation of sulfur content of barium-calcium alloy produced by “carbothermal method” using barite (BaSO4) as barium raw material was analyzed. Physical and chemical test results show that the sulfur in calcium-calcium-barium alloy is mainly in the form of sulfide or complex sulfur oxide. According to the thermodynamic calculation, the carbothermal reduction process of barium sulfate is mainly carried out in a liquid-solid reaction manner, thereby causing the sulfide or sulfur oxide having a specific gravity greater than that of the Si-Ca-Ba alloy to remain in the final product.