高碳硫铁矿制酸工艺技术探讨

Discussion on technology of sulphuric acid manufacture based on high carbon containing pyrite.

高碳硫铁矿焙烧时发热量大，以含Ｓ为３４０％、Ｃ为６０％的矿为例，将多产热４８％左右，沸腾炉需增大移热面积，以确保正常操作；由于焙烧含碳硫铁矿，炉气的ＳＯ２浓度降低、进转化工序的Ｏ２／ＳＯ２值降低，要满足两转两吸的工艺需求，原料含碳量应＜６５％。对含Ｃ＞６５％的硫铁矿，制酸以一转一吸工艺较稳妥；但可采用富氧焙烧、富氧补氧和矿、硫磺共用等措施提高ＳＯ２浓度和Ｏ２／ＳＯ２比值，以满足两转两吸的工艺要求。

Abstract Because more heat will be generated when roasting high carbon containing pyrite, for instance, 45% more heat is generated for roasting pyrite containing 34.0% S and 6.0% C, more cooling area is needed for normal operation. Carbon content of pyrite should be <6.5% when double absorption process is used on account of drop in SO 2 concentration and O 2/SO 2 ratio of feed gas to convertor. For pyrite containing ≥6.5% C, single absorption process is suitable, and if oxygen enriched roasting, oxygen enriched air supplement or combination of pyrite with sulphur are adopted to increase SO 2 concentration and O 2/SO 2 ratio double absorption process is also suitable.