某型圆锥破碎机矿石颗粒群破碎特性分析

为研究某型圆锥破碎机矿石颗粒群破碎特性,结合圆锥破碎机工作原理,利用Tavares模型建立矿石颗粒群破碎模型,分析了圆锥破碎机矿石颗粒群破碎仿真的破碎特征,同时与圆锥破碎机动态破碎实验进行对比。结果表明:1)圆锥破碎机矿石颗粒群破碎过程主要分为紧密阶段、初始破碎阶段、粉碎阶段、排料阶段四个阶段;2)圆锥破碎机动态破碎后粒级分布表明,矿石颗粒群碎后粒级分布基本相同,圆锥破碎机矿石颗粒群碎后矿石颗粒粒径主要分布在10 mm以下,平均占比为67.56%,6 mm以下矿石颗粒物料含量占比不大,平均占比为17.51%;3)通过对比仿真与试验,验证了Tavares模型在圆锥破碎机破碎仿真模拟的有效性,同时标定了矿石颗粒群的Tavares模型仿真参数,为矿石颗粒的破碎仿真提供了新的思路,研究结果可为后续圆锥破碎机设计和性能测试提供参考。

矿石粒子群碰撞作用下溜井垮塌轮廓推演分析

受溜井井壁和底部矿堆的限制作用,落入溜井的矿石对井壁造成直接碰撞损伤和触底后的反弹碰撞损伤,进而导致井壁出现垮塌破坏。基于运动学理论建立卸矿模型,分析溜矿段矿石落入溜井内的运动状态。借助Python科学计算工具,计算空井和非空井条件下矿石粒子群对井壁不同位置的碰撞频数,并以此定量表征井壁损伤程度。矿石粒子群在不同贮矿矿堆高度下对溜井井壁碰撞损伤的结果,可以解释溜井实际垮塌轮廓与破坏趋势。研究结果与实际垮塌扫描形态相吻合,验证了溜井垮塌形态分析结果的正确性。在溜井垮塌机理方面国内外可借鉴的经验较少,碰撞分析过程与结果也可为溜井垮塌趋势、结构参数设计及加固技术方案提供参考。

Geochip-based analysis of microbial functional genes diversity in rutile bio-desilication reactor

Biological desilication process is an effective way to remove silicate from rutile so that high purity rutile could be obtained. However, little is known about the molecular mechanism of this process. In this work, a newly developed rutile bio-desilication reactor was applied to enrich rutile from rough rutile concentrate obtained from Nanzhao rutile mine and a comprehensive high through-put functional gene array(Geo Chip 4.0) was used to analyze the functional gene diversity, structure and metabolic potential of microbial communities in the biological desilication reactor. The results show that TiO2 grade of the rutile concentrate could increase from 78.21% to above 90% and the recovery rate could reach to 96% or more in 8-12 d. The results also show that almost all the key functional genes involved in the geochemical cycling process, totally 4324 and 4983 functional microorganism genes, are detected in the liquid and ore surface, respectively. There are totally 712 and 831 functional genes involved in nitrogen cycling for liquid and ore surface samples, respectively. The relative abundance of functional genes involved in the phosphorus and sulfur cycling is higher in the ore surface than liquid. These results indicate that nitrogen, phosphorus and sulfur cycling are also present in the desiliconization process of rutile. Acetogenesis genes are detected in the liquid and ore surface, which indicates that the desiliconizing process mainly depends on the function of acetic acid and other organic acids. Four silicon transporting genes are also detected in the sample, which proves that the bacteria have the potential to transfer silicon in the molecule level. It is shown that bio-desilication is an effective and environmental-friendly way for enrichment of rough rutile concentrate and presents an overview of functional diversity and structure of desilication microbial communities, which also provides insights into our understanding of metabolic potential in biological desilication reactor ecosystems.

盐中黄金

韩国西海岸雄进半岛及延平岛海水下蕴藏着丰富的矿石群，竹盐的主要原料天日盐便由这里的海水提炼而成。