Modeling heap biooxidation of arsenic-bearing gold ore

To design heap biooxidation process,it is necessary to understand its internal rules.The heap biooxidation of gold ore from Anhui province was researched in this study.The results showed that the main microorganisms in the heap were A.ferrooxidans,F.acidiphilum and L.ferrodiazotrophum.Under their combined action,gold leaching extent rose from 35.62%to 78.08%in 80 d.Boltzmann model matches the actual oxidation effect better and the model equations were obtained.The model predicted that the oxidation extents of arsenic and sulfur are 58.577%and 42.122%after one year,and the gold leaching extent was 80.40%.The arsenic and sulfur oxidation extents,and gold leaching extent were all linearly correlated.It is more reliable to predict gold leaching extent by sulfur oxidation extent.These results provided good guidance for practical application in the actual production.

莫高窟窟门对窟内热环境影响研究

莫高窟洞窟均为单侧开口形式,窟门是窟内外空气交换的唯一途径。为研究窟门对窟内热环境稳定的影响,以第206窟、第209窟为例,通过现场测试方法,分析不同窟门洞窟在冬季、秋季窟内热环境的特点;通过数值模拟方法,比较窟门的百叶窗面积发生改变时,第206窟冬季分别在热压作用下、热压风压共同作用下,洞窟沿进深方向的温度影响范围。结果表明:在冬季,第206窟、第209窟窟门漏风量分别为0.01 m^(3)/s、0 m^(3)/s,窟门漏风量越小,窟内温度波动越小;第206窟、第209窟窟门传热系数分别为6.7 W/(m^(2)·K)、2.3 W/(m^(2)·K),在秋季,窟门传热系数越小,洞窟入口处的温度波动越小;第206窟在热压作用下,洞窟的温度影响范围随窟门百叶窗开口面积的增大而增大,最大为2.2 m,在热压风压共同作用下温度影响范围均为6.8 m,达到整个洞窟。

新型TBM推进机构力传递性能分析

在实际工况中,推进机构要承受重载荷、大突变载荷以及极限载荷,若力传递能力不足,将造成机构关键零部件损伤或失效。以搭建的新型TBM试验台为研究对象,运用SolidWorks建立推进机构重构后的三维实体模型,基于并联机构螺旋理论建立推进机构运动耦合度指标,对V型推进机构调向力与调向力矩以及运动耦合度进行分析,并以两种典型的推进机构为对象,比较两者的推力传递效率,验证该指标的正确性。