蛇紋岩之微結構與粉碎粒度分佈特性之研究

蛇紋岩在台灣的蘊藏量豐富，其化學成分中含有極高的MgO，可取代白雲石用於高爐煉鋼作業中的助熔劑工業用蛇紋岩的生產過程是由爆破粉碎後，經過篩而得到適當粒級的產品。而在粉碎過程中，發現蛇紋岩的破裂強度比預期強度要大許多。為了瞭解蛇紋岩的粉碎性質，特以較硬的花崗岩做為比較。本研究實驗結果，蛇紋岩的微結構是呈現片狀晶粒以交錯編織網狀排列。其片狀長度40～60μm，晶粒厚度6～10μm。維氏硬度值在280～350kg/mm^2，相當於摩式硬度5。但是，其破裂韌性與抗壓強度則比同級硬度者大得多，此與其微結構有相當密切之關係。另以顎型碎礦機粉碎後蛇紋石的粒度分佈與花崗岩或其他岩石之粒度分佈，有著明顯的差異，尤其是在細粒分佈部份特別少，此乃礦物結晶顆粒相互交叉，造成了破碎時無法很順利的沿著結晶邊界破裂，而產生微細粉末較少的粒徑分佈的蛇紋石特有的性質。

關鍵字

蛇紋石；粉碎；粒度分佈；微結構

並列摘要

The reserve of serpentine ore is very plentiful in Taiwan. Recently, it was a substitute of dolomite as the flux of blast furnace for its high magnesium oxide and low silica contents. The product processes of serpentine ore were mine quarry, comminution and sizing. During the comminution process, the strength of serpentine was estimated higher than equal hardness ores such as dolomite and quartzite. This study focuss on the relationship between the characteristics of comminution properties and microstructure of serpentine ore. It is found that the lamella crystalline grains in the microstructure of serpentine interweave each other closely. The thickness of lamella is in the range of 6-10μm and the length is 40 to 60 μm. The Vicker's hardness is 280 kg/cm^2 to 350 kg /cm^2, which is equivalent to 5 of Mohr's Hardness. The fracture toughness is higher than the same hardness ores such as magnetite and dolomite. The fines in comminution products are less than the normal size distribution of general comminution products. This is contributed from the interwoven microstructure of serpentine crystals.

並列關鍵字

Serpentine ； Comminution ； Size distribution ； Microstructure

國際替代計量

蛇紋岩之微結構與粉碎粒度分佈特性之研究

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