气相氧化法提纯人造金刚石的新工艺设计与评价

Design and Estimate of New Synthetic Diamond Purification Process by Gas Phase Oxidation

目前人造金刚石的提纯工艺是一道高污染的工序。基于对人造金刚石合成棒中各组分不同的物理、化学性质分析,设计了气相氧化法提纯人造金刚石的新工艺,有效避免了传统工艺带来的严重环境污染。研究了石墨的气相氧化机理,对温度、时间对石墨氧化速率的影响机制进行了分析。结果表明:采用该工艺所得金刚石成品的抗压强度、晶体形貌和纯度均达到品质指标;同时新工艺通过减少酸用量及回收催化剂合金,有效降低了成本,具有明显的经济效益。

Synthetic diamond purification process is a high contaminative procedure at present. Based on different physics and chemistry characters of each component in synthetic rod, a new diamond purification process by gas phase oxidation is designed. The process environmentally is a very efficient and correct procedure for diamond purification. By experimental study on gas phase oxidation mechanism of graphite, the mechanisms of dependence of oxidation rate on temperature, oxidation time are analyzed. The analysis of technical and economic criterions on the new process shows that compression strength, crystal shape and purity of diamond product by the purification process attain to quality criterions, and the new process reduces the cost and realizes good economic benefits by reducing acid dosage and recycling catalyst-solvent.