论文部分内容阅读
潼关蛭石矿赋存于太古界太华群岩层中。矿石结构疏松,蛭石片径细小,片径大于7mm者占3.17％,3.5—7mm者占6.11％,1～3.5mm者占24.96％,小于1mm者占65.66％。膨胀蛭石干容重0.17～0.57t/m~3,导热系数0.061～0.107千卡/米·时·度,体积膨胀倍鼓3.5—14倍。根据蛭石焙烧失水膨胀的特性,经试验拟定出焙烧—风选测定蛭石品位方法。基本操作程序:破碎→烘干(105℃)→焙烧(950℃)→风选→双目镜下鉴定→计算。焙烧后样品分大于40目、40—100、目小于100目三级分别进行选别,人工撖簸,台式电风扇供风。大于40目粒级,撒簸速度3～3.4克/秒,风速5.5—7米/秒;40—100目级,撒簸速度1.5—2.2克/秒,风速3.5～4.5米/秒;小于100目粒级双目镜下鉴定。蛭石品位按公式N=g_1(1+K)/G×100％计算(N:蛭石品位,G:试样重量,g_1:膨胀蛭石总重量,K:蛭石烧失率)。该法精密度较好,变动系数5.82％,测试结果与泡沫选法及淘洗—泡沫浮选法测试结果对比,平均误差7.84％。用此法测定蛭石品位完全可满足细粒级蛭石矿床评价、勘探要求。
Tongguan vermiculite ore hosted in the Archean Taihua group rock. The structure of ore is loose. The diameter of vermiculite is very small. The diameter of the vermiculite is 3.17%, the diameter of 3.5-7mm is 6.11%, the diameter of vermiculite is 24.96%, the diameter of vermiculite is 65.66%. Expansion of vermiculite dry bulk density of 0.17 ~ 0.57t / m ~ 3, the thermal conductivity of 0.061 ~ 0.107 kcal / m · degree · degrees, the volume expansion drum times 3.5-14 times. According to the characteristics of vermiculite roasting water loss and swelling, the method of roasting-wind selection for determining vermiculite was developed. Basic operating procedures: broken → drying (105 ℃) → roasting (950 ℃) → wind election → binocular identification → calculation. The sample after roasting is more than 40 meshes, 40-100 meshes, less than 100 mesh meshes, respectively, for sorting, artificial thrashing, and desktop fan for wind supply. More than 40 mesh particle size, throwing speed of 3 to 3.4 g / s, wind speed of 5.5-7 m / s; 40-100 mesh level, throwing speed of 1.5-2.2 g / s, wind speed 3.5 ~ 4.5 m / s; less than 100 Eyeball binocular identification. The grade of vermiculite is calculated according to the formula N = g_1 (1 + K) / G × 100% (N: Vermiculite grade, G: weight of sample, g_1: total weight of expanded vermiculite, K: loss rate of vermiculite). The precision of the method is good, the coefficient of variation is 5.82%. The test results are compared with the foam test and the froth-froth flotation test. The average error is 7.84%. Determination of vermiculite grade by this method can fully meet the requirements of fine-graded vermiculite deposit evaluation and exploration.