摘要：以粒径为>2～2. 36、0. 83～2 mm的石英砂为原料,钢球、短圆柱形钢锻为磨矿介质,磨矿质量为500 g,矿浆质量分数为65%,磨矿时间为0. 5、1、2、4、8 min,钢球的个数配比:D₃₀∶D₂₅∶D₂₀=43∶62∶96,短圆柱钢锻个数配比:D_30×30:D_25×25:D_20×20=28∶41∶64,介质充填率为0. 4,球磨机转速为96 r/min,进行分批次磨矿。结果表明:不同介质形状下,石英砂的粉碎速率遵循一阶动力学模型,且在短时间内短圆柱钢锻的粉碎速率明显大于钢球的,表征物料粉碎难易程度的γ值越小粉碎越容易,φ、β表征粗颗粒粒级破碎至相应细粒级的速率,短时间(1 min)粉碎过程中介质形状对初始粉碎分布参数有影响,钢锻和钢球介质相比:γ值偏小,而φ和β值偏大。建议在石英砂的粉碎过程中,可以选择钢锻介质对其进行快速破碎。

Abstract: Two kinds of monosize fractions quartz sands such as ＞2～2．36、0．83～2 mm were used as raw materials，the steel balls and short cylindrical steel forgings as grinding media，grinding filling of 500 g，the pulp mass fraction was 65% ，grinding time of 0．5、1、2、4、8 min，ratio of number of steel balls: D₃₀∶D₂₅∶D₂₀ = 43 ∶ 62 ∶ 96，ratio of number of short cylindrical steel forgings: D_{30 × 30}∶D_{25 × 25}∶D_{20 × 20} = 28∶41∶64，ball charge of 0．4，mill speed of 96 r/min，and the dry grinding were performed．The results show that the specific rates of crushing of quartz obeys first-order-breakage kinetics with different shape of medium，and the specific rates of crushing of the short-cylinder steel forging were obviously higher than those of the steel ball under short time，also there has some effect on primary breakage distribution parameters with the shape of the medium in short time ( 1 min) ．The smaller the value of γ is，the easier it is to crush，the crushing speed of materials are of φ、β．Compared with steel ball medium，the value of γ was smaller，while the value of φ and β is larger．It is suggested that steel forging medium can be chosen to crush quartz sand rapidly during the crushing process．

Keywords: quartz sands; specific rates of crushing; primary breakage distribution; grinding medium shape