钒渣亚熔盐法钒铬共提工艺清洁生产评价

Assessment for cleaner production of vanadium and chromium co-extraction from vanadium slag by sub-molten salt method

针对现有钒渣钠化焙烧提钒工艺钒提取率低、铬不能提取、三废环境治理代价高等难题,中科院过程工程研究所和河钢承钢开发钒渣亚熔盐法钒铬共提清洁生产工艺,于2017年建成5万t生产线,目前已运行两年以上,取得可靠的工业化运行和环境保护检测数据。本文通过选取资源能源利用、生产工艺技术、污染物排放、资源综合利用、产品特征、环境管理6类一级指标及其下属的27个二级指标,对该工艺进行清洁生产水平分析。结果表明:工艺清洁生产指数达98.02,属于清洁生产先进水平。工艺可在温和条件下实现钒铬的高效清洁提取,为我国36亿t高铬型钒钛磁铁矿的利用提供关键解决方案,可引领钒化工产业的绿色升级。

The traditional sodium roasting process has a number of disadvantages including low vanadium and chromium extraction rate,generation of waste water and toxic residue.Recently,a new vanadium production process based on the sub-molten salt(SMS)technology was developed by IPE,CAS and HBIS Group Co.,Ltd.And a 50 kt demonstration plant was built in 2017.After two years operation,many reliable industrial data were obtained.In this paper,the cleaner production level of new technology was analyzed by selecting six first-class indexes,i.e.resource and energy utilization,production technology,pollutant discharge,comprehensive utilization of resources,product characteristics,environmental management and 27 second-class indexes under them.The analysis results show that the cleaner production level of new process is 98.02,which means that this technology belongs to high level of cleaner production.The new technology could realize efficient extraction of both vanadium and chromium under mild reaction condition,providing technical supports for the effective utilization of the 3.6 billion tons of high-chromium containing vanadium titano-magnetite ores in China and can be the green production leader of vanadium chemical industry.