川西北建筑石料用白云岩可行性研究及开发利用前景分析

川西北龙门山地区泥盆系中-上统碳酸盐岩分布广泛,作为水泥原料及治金工业原料的石灰岩利用较多;而传统白云石的利用对MgO等组分要求较高,限制了资源的利用,研究拓展白云岩的用途尤为必要。泥盆纪白云岩MgO含量12. 59%~21. 12%,平均值18. 72%,SO3含量0. 12%~0. 83%,饱和抗压强度35~75 MPa,压碎指标8. 2%~10. 9%,坚固性指标2%~4%,碱集反应14d,膨胀率0. 013%~0. 017%,C(α)值为3. 50×102Bq/kg,C(β)值为1. 76×102Bq/kg,IRa为0. 08、Ir为0. 06,所有指标均符合建筑石料用标准,且大部分指标达到Ⅰ类石料用要求,储量高达60000万t以上。而建筑石料在基础建设中拥有不可替代的作用且用量巨大,其开发应用前景广阔。

Feasibility study and utilization prospect analysis of dolomite for building stone in northwest Sichuan

Middle-upper Devonian carbonate rocks are widely distributed in Longmenshan area,northwest Sichuan Province.Limestone is widely used as cement raw materials and Gold industry raw materials. However,traditional dolomite utilization requires high MgO and other components,which limits the utilization of resources. It is imperative to study and expand the use of dolomite. The MgO content of Devonian dolomite ranges from 12.59% to 21.12%,with an average of 18.72%,SO3 content ranging from 0.12% to 0.83%,saturated compressive strength ranging from 35 to 75 MPa,crushing index ranging from 8.2% to 10.9%,firmness index ranging from 2 to 4%,alkali expansion reaction 14 d expansion rate from 0.013%-0.017%,C( a) value less than 3.50×102 Bq/kg,C( beta)value 1.76×102 Bq/kg,IRa is 0.08,Ir is 0.06,all indicators meet the building stone standards,and most of the indexes meet the requirements of class Ⅰ stone. Building stone has an irreplaceable role in infrastructure construction and a huge amount of it,so its application prospect is broad.