(一)概述 我国煤系中有丰富的硫铁矿资源。过去由于对综合回收利用未予重视,使得硫的供不应求问题日趋突出。以辽宁省为例,每年约需硫精矿80万吨,其中约四分之一靠兄弟省调入,往往又因路途遥远、运输困难而得不到保证,致使有的硫酸厂被迫待料停产。然而对省内煤矸石中伴生的大量硫铁矿,却未加利用,并由于作废石排弃而污染环境。从全国来看,这方面问题更大,特别是在含高硫的产煤区。因此,从煤矸石中综合回收硫铁矿,乃是一项意义重大的技术措施。 从煤矸石中回收硫精矿的经济效益很显著。南桐选煤厂的成本为19.2元/吨,采屯 (A) Overview Coal is rich in pyrite resources. In the past due to the comprehensive recycling did not pay attention, making the issue of sulfur shortage increasingly prominent. Taking Liaoning Province as an example, about 800,000 tons of sulfur concentrate are required each year, of which about a quarter are transferred to other provinces. Often, they are not guaranteed due to long distances and difficulties in transportation, resulting in some sulfuric acid plants being forced to stay Material discontinued. However, a large amount of pyrite associated with coal gangue in the province has not been utilized and pollutes the environment due to abandonment of abandoned rocks. From a national point of view, the issue is even more problematic, especially in high-sulfur-producing coal-producing areas. Therefore, the comprehensive recovery of pyrite from coal gangue is a significant technical measure. The economic benefits of sulfur concentrate recovery from coal gangue are significant. Nantong coal preparation plant costs 19.2 yuan / ton, mining Tuen