Minimization of Hexavalent Chromium Formation in Chrome- magnesite Brick

摘要建议编号：9414446主要调查者：纳萨拉拉这是一项关于废铬镁砖中六价铬来源的研究。新砖中铬(VI)的含量与砖的生产工艺变量(烧成温度、结合类型、化学成分)相关。研究了不同温度下砖杂质对六价铬形成的影响，试图解释耐火材料冷面相对于热面铬(VI)含量较高的原因。铬镁耐火材料广泛应用于钢铁、铜和玻璃工业。它们被慢慢地消耗掉，必须不时地更换。废铬镁砖因其高含量的六价铬而被列为危险废物。减少或消除六价铬的形成将降低处置成本和环境威胁。

ABSTRACT Proposal Number: 9414446 Principle Investigator: Nassaralla This is a study of the sources of hexavalent chromium in spent chrome- magnesite brick. The amount of chromium (VI) in new brick is correlated with the brick production process variables (firing temperature, bonding type, chemical composition). The effect of brick impurities on formation of hexavalent chromium is studied at various temperatures; an attempt is made to explain the relatively high levels of chromium (VI) in the cold face of the refractory relative to the hot face. Chrome-magnesite refractories are used extensively in the steel, copper, and glass industries. They are slowly consumed and must be replaced from time to time. Spent chrome-magnesite brick is classified as a hazardous waste because of its high levels of hexavalent chromium. Reduction or elimination of chromium (VI) formation would reduce disposal costs and environmental threat.