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一、改进前情况我矿机选厂过去采用的是一段混合磨矿、兩段选矿流程(如圖1)。根据矿石的嵌佈特性来看,这种流程是不够合理的。因处理的原矿石是以鎢錳鉄矿和鎢酸鈣矿为主的多金属矿石。主要脉石是石英,圍岩是花崗岩。共生矿物有黄铁矿、閃鋅矿、辉鉍矿、輝銅矿和方鉛矿等。原矿粒级特性如下頁附表。从表上可看出,原矿的天然結晶粒度是在3～0.1公厘左右,而主要是介于0.5～0.1公厘之間。在3公厘左右才开始有單体钨出现,150目才基本解离完全。因为細粒嵌佈居多,采用單段混合磨矿,由于磨矿比太大,往往造成矿石中結晶粗的矿物过粉碎,降低了回收率。所以根据矿石尤其是鎢矿石的嵌佈特性,进行多段磨选,防止矿石泥化,是比較有效的一項措施。
First, to improve the situation before mine mining plant used in the past is a mixed grinding, two mineral processing (Figure 1). According to the embedded characteristics of the ore, this process is not reasonable enough. Because of the treatment of raw ore is tungsten manganese 鉄 ore and calcium tungstate-based polymetallic ore. The main gangue is quartz and the surrounding rock is granite. Symbiotic minerals are pyrite, sphalerite, bismuthinite, chalcocite and galena. Raw ore grain-level characteristics of the following page schedule. As can be seen from the table, the natural grain size of ore is about 3 to 0.1 mm, while mainly between 0.5 to 0.1 mm. In about 3 mm monomer began to appear tungsten, 150 mesh before the basic complete dissociation. Because of the majority of fine-grained embedded, single-stage mixed grinding, the grinding ratio is too large, often resulting in coarse ore minerals crushed, reducing the recovery rate. Therefore, according to the ores of ores, especially tungsten ores, it is a more effective measure to carry out multi-stage milling to prevent ore from mudding.