矿口

放矿口对崩落法放矿的影响

INFLUENCE OF DRAW HOLE ON ORE DRAWING Mechanics of Ore Drawing

利用计算机模拟研究了不同放矿口间距下的放矿过程。

The ore-drawing courses under different ore-drawing-hole spacing are studied with computer simulation .

放矿口间距的优选研究

Study of optimization of ore-drawing-hole spacing

你可以完全控制外观和矿口设定：无窗口、透明、可移动和艺术效果。

You get full control of the appearance and window settings : windowless , transparent , moveable , the works .

对此，本文研究了放矿口尺寸及散体放出速度分布对崩落法放矿的影响。

This paper systematically studies how drawhole width and draw out-ore velocity distribution affect the law of broken ore movement .

重型运土设备使用时，操作人员只能看到有限的区域，因此，必须指派矿口监工随时警告操作人员在操作位置上无法发现的危险。

It is , therefore , essential that a banksman be appointed to warn the operator of hazards that cannot be seen from the operator 's position .

因崩落法采矿是崩落矿石在废石覆盖层下放出的，覆盖层废石很容易掺杂到矿石中与矿石一起从放矿口放出，从而造成矿石的损失和贫化。

Because caving mining ores are emited under the cover of waste rock . overburden rock is easily doped with mineral ore emitting out , causing ore loss and dilution .

矿浆给入一棵分选柱的给矿口中，矿粒向下沉降，气泡向上浮升，具有疏水性的矿粒被浮选成为粗精矿，并进入精选分选柱中进行多次精选获得最终精矿。

Pulp feed into one column , mine tablets down and air bubble rise , hydrophobic ore became thick ore concentrates after flotation process , and into concentrate separate column made many times generation got finally concentrate .

但由于全尾矿中这种颗粒少，离放矿口不远处的滩面坡度就变的很平缓，流速很慢，维持这种缓慢滑移流动的滩面坡度约为0.3%。

Because the grain is little in full tailings , angle of beach surface slope become very smooth near the gateway , and the flow is very slow . Remain the slowly sliding flow , so angle of beach surface is about 0.3 % .

矿产品进出口政策研究：关税调整的基石

Research on the policy of export and import of mineral products & tariff Foundation

根据中国海关统计数据，跟踪研究分析了2002年中国矿产品进出口贸易的情况，归纳总结出2002年中国矿产品进出口贸易的一些主要特点

According to the basic information of customs statistics , the paper analyzes the facts of import and export trade of the China 's mineral products in 2002 Also the main characteristics of china 's mineral product trade in 2002 are summarized

采场放矿漏斗临界放矿口直径的确定

Establishment of critical diameter of a discharge hopper mechanics of ore drawing

分析了影响散粒体流动性能的因素，采用标志颗粒法进行了崩落矿岩散粒体流动性能试验，主要考虑的因素有放矿口大小、散体颗粒的粒径以及不同的散体材料。

Secondly , experiments are carried out to study the granular flow characters considering the size of drawing hole , size of grain and type of material by index grain method .