国外某海滨砂矿综合回收试验研究

Experimental study on comprehensive recovery of a beach placer ore abroad

国外某海滨砂矿富含钛铁矿、锆石、独居石等多种有用矿物。钛铁矿矿物经历蚀变,部分锆石表面被铁污染,矿物磁、电性质发生变化,较为难选。采用筛选—螺旋溜槽一粗一扫工艺预富集重矿物,获得产率23.78%,Fe、TiO_(2)、 REO、 Zr(Hf)O_(2)品位分别为25.76%、 43.73%、 0.44%、 2.83%,回收率分别为93.70%、 93.11%、 78.32%、93.64%的重砂。针对重砂,采用弱磁选铁—高梯度强磁选一粗一精一扫,分离出部分磁性较强钛精矿,强磁中矿采用摇床—干式磁选—电选流程分离出独居石精矿和另一部分磁性较弱钛精矿,强磁尾矿进行摇床选锆—锆粗精矿进行电选除杂,从而分离出铁精矿、钛精矿、独居石精矿和锆精矿产品。相对重砂,精矿与中矿中TiO_(2)、REO、Zr(Hf)O_(2)综合回收率分别为99.16%、67.71%、89.56%,实现了有用矿物的综合回收。研究结果可为类似海滨砂矿的开发和综合回收提供参考。

There is a beach placer ore abroad, which is rich in ilmenite, zircon, monazite and other valuable minerals. Oxidation alteration of ilmenite and some contaminated zircon surface with iron change the magnetic and electrical properties of the minerals, which makes it difficult to separate. In view of the complex characteristics of raw ore, a process of sieve and one rough-one sweep with spiral chute was carried out to enrich the heavy minerals in a 23.78% yield concentrate, in which the grade of Fe, TiO_(2),REO and Zr(Hf)_(2) Owere 25.76%, 43.73%, 0.44%, 2.83%, while the recovery were 93.70%, 93.11%,78.32%, 93.64%, respectively. Based on the heavy minerals concentrate, a process including low-intensity magnetic separation of iron, then one rough one fine and one sweep with high-intensity magnetic separation(WHIMS) was applied to separate ilmenite and enrich monazite. Part of stronger magnetic ilmenite was separated in WHIMS final concentrate, monazite and another part of weaker magnetic ilmenite in WHIMS middling were separated by a process of table separation, dry magnetic separation and high-tension separation. Zircon in WHIMS tailings was separated by a process of table separation and then high-tension separation for impurities removal of rough zircon concentrate. The separation of magnetite concentrate, ilmenite concentrate, monazite concentrate and zirconium concentrate were finally achieved. The total TiO_(2), REO and Zr(Hf)O_(2) recovery rate of heavy minerals concentrate were99.16%, 67.71% and 89.56% respectively. The comprehensive recovery of valuable minerals was realized. This research could be a reference for the exploitation of similar beach placer ores.