用锰矿溢流尾矿合成ZSM—5分子筛的研究

Synthesis of ZSM—5 Molecular Sieve from Overflow Tailings of Manganese Ore

以锰矿溢流尾矿为原料合成ZSM—5分子筛功能材料,并以XRD、ICP、IR、SEM和XPS等多种物理化学手段考察了尾矿中锰组分等对合成ZSM—5功能材料的工艺影响。结果表明:锰矿溢流尾矿中的硬锰矿晶相锰组分主要以四价锰的形式存在,较难与稀酸反应而被直接去除,对尾矿高温碱熔活化后的ZSM—5水热合成收率和结晶度有较大的影响;尾矿中四价锰组分经活性炭煅烧还原成二价锰后较易酸洗处理,合成产物的结晶度与尾矿锰组分的酸洗去除率呈正比关系;较优工艺条件下,合成产物ZSM—5的相对结晶度可达到112%,尾矿中硅质组分的利用率可达到86.6%左右,能有效地实现锰矿溢流尾矿的资源高值化综合利用,为实现广西金属尾矿资源化利用提供了新途径。

The functional materials of ZSM—5 molecular sieve were firstly synthesized from the overflow-tailings of manganese ore,and the effects of manganese components in the tailings on the synthesis technology of the ZSM—5 functional materials were investigated by means of XRD,ICP,IR SEM,XPS and other physical and chemical means.The results show that the manganese component with hard manganese crystal phase in the overflow tailings of manganese ore mainly exists in the form of tetravalent manganese,which is difficult to be directly removed by reaction with dilute acid,and has a great influence on the yield and crystallinity of hydrothermal synthesis of ZSM—5 after the activation of high temperature alkali fusion of tailings.The tetravalent manganese component in tailings with calcinating reduced to divalent manganese by active carbon is easy to be treated by acid pickling,and the crystallinity of synthetic product is in direct proportion to the pickling removal rate of manganese component in tailings.Under the better technological conditions,the relative crystallinity of the synthetic product ZSM—5 can reach 112% and the utilization rate of the silicite component in the tailings can reach about 86.6%,which can effectively realize the high-value resource utilization of overflowing tailings of manganese ore,and provide a new route for the resource utilization of metal tailings in Guangxi.