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本文报道希腊一个铬铁合金联合公司在改善选矿工艺、经济及铬铁精矿冶炼方面的进展。简述了该企业的历史和有关的矿石性质后，描述了由原来的重选到采用重介质分选的变化。起初重介质只是用来预选，后来则同时生产出高品位的块精矿。这种精矿可以直接入炉，并且可以提高冶炼厂的生产能力。1989年采用了一台新型的三段两密度三矿流分选器，替代原来静态鼓式的重介质分选系统，使选矿厂处理原矿的生产能力提高了76％，而且可以经济地处理品位更低、更难选的矿石。选厂在变革后最初18个月的生产情况是：矿石虽然更难选，但回收率却明显提高，单位功耗减少40％以上，选厂的有效利用率超过96％。在第一年间，一般的物价上涨了约15％，但选矿生产费用却下降18％，并在不到18个月的时间内偿还了投资。
This article reports on the progress made by a Greek ferro-chrome alloy company in improving beneficiation process, economy and smelting of ferrochromium concentrate. After a brief description of the company’s history and related ore properties, the changes from prior re-election to the use of heavy media separation are described. At first, heavy media was used only for preselection, and later, high-grade block concentrates were produced at the same time. This concentrate can be fed directly into the furnace and can increase the smelter’s capacity. In 1989, a new three-section two-density three-stream flow sorter was introduced to replace the original static drum type of heavy media sorting system, increasing the capacity of the concentrator’s processing of raw ore by 76% and economically handling the grade Lower, harder ore. The first 18 months after the changeover process, the production situation of the dressing plant is that although the ore is more difficult to pick, the recovery rate has obviously increased. The unit consumption is reduced by over 40% and the effective utilization rate of the dressing plant is over 96%. In the first year, general prices rose about 15%, but dressing production costs dropped 18%, and the investment was repaid in less than 18 months.