国外某难选沉积岩型氧硫混合铜矿选矿工艺研究

Study on process of a refractory sediment-hosted oxygen-sulfur mixed copper ore abroad

对国外某矿床铜矿石进行工艺矿物学分析,发现矿石中有价元素为铜,含量2.17%。铜主要以孔雀石和辉铜矿的形式存在,这些矿物嵌布关系复杂,大部分以它形粒状、不规则状嵌布于脉石矿物中,部分孔雀石和辉铜矿粒度细小,且与褐铁矿三者之间嵌布关系较紧密;脉石矿物绝大部分为白云石,含量高达83.97%,矿石类型为沉积岩型氧硫混合铜矿。针对这一复杂难选的铜矿石,采用“先硫后氧”的工艺流程,使用硫化铜粗选精矿再磨工艺,并使用NaHS和(NH_(4))_(2)SO_(4)作为氧化铜矿的活化剂,(NaPO_(3))_(6)作为脉石矿物的抑制剂,最终获得了高品位硫化铜精矿(Cu 62.37%)和低钙镁含量(CaO+MgO 12.50%)的氧化铜精矿(Cu 30.08%),铜综合回收率82.47%,实现了对这类矿石的高效回收。

The process mineralogical analysis of copper ore in a foreign deposit shows that the valuable element in the ore is copper,the content of which is 2.17%.Copper mainly exists in the form of malachite and chalcocite,and these minerals have a complex associative relationship,most of which are associated with gangue minerals in xenomorphic-granular and irregular texture.Some malachite and chalcocite have small particle size and are closely associated with limonite.The majority of gangue minerals are dolomite,the content of which is 83.97%.The ore type is sediment-hosted oxygen-sulfur mixed copper ore.In view of the complex refractory copper ore,this paper adopts the process of“first copper sulfide and then copper oxide”.The regrinding process of copper sulfide roughage concentrate was used,and NaHS and(NH_(4))_(2)SO_(4) were used as activators of copper oxide and(NaPO_(3))_(6) as inhibitors of gangue minerals.Finally,high grade copper sulfide concentrate(Cu 62.37%)and low calcium and magnesium content(CaO+MgO 12.50%)copper oxide concentrate(Cu 30.08%)were obtained,and the comprehensive recovery rate of copper was 82.47%,which realized the efficient recovery of this kind of ore.