随机介质放矿理论散体流动参数试验

TEST ON GRANULES FLOW PARAMETERS OF ORE DRAWING WITH STOCHASTIC MEDIUM THEORY

随机介质放矿理论散体流动参数原有测量方法的不足主要表现在:由于散体颗粒运动表现出不确定性和随机性,散体流动参数测量存在较大误差;标志颗粒与试验矿岩散体流动性能不一样;原有参数求解方法一般采用放出量与放出体高度之间的关系式求解,测量结果与实际差别较大。在试验的基础上,改进标志颗粒的制作方法与放置方法,提出利用放出体方程求解散体流动参数的新方法。对2个矿山的4种不同矿石进行散体流动参数测量对比试验。试验结果表明,利用新方法得到的散体流动参数与实际基本相符。将该方法应用于北洺河铁矿生产中,确定合理的采场结构参数,取得较好的技术经济效果,矿石回采率为90%,贫化率为11%。现场应用表明,随机介质放矿理论的散体流动参数可较好地反映崩落矿岩的流动特性,散体流动参数测量新方法可大大地增强随机介质放矿理论的工程适用性。

The traditionally measuring method of granules flow parameters in the stochastic medium theory of ore drawing（SMTOD） has certain insufficiency.Because of uncertainty and randomness of granules movement in the process of ore drawing,there is great error in measuring the granules flow parameters.Besides,the flow performance of index granular is different from experimental granular.Moreover,the existing solution method of granules flow parameter is deduced by equation between drawn-quantity and height of drawn-body,and the shape of granules drawn-body measured by this method is different far from actual one.Based on experiment,by improving production and placement method of index particle,a new measurement method to test the granular flow parameters by drawn-body equation is proposed.Four kinds of loose bodies from two mines are used to measure flow parameters.The experimental result indicates that granules flow parameters obtained by the new method match well with those of actual situation.Moreover,the new method is used in Beiminghe Ore Mine to determine rational stope structure parameters,and good technical and economic target is obtained.The recovery ratio and depletion ratio is 90% and 11% respectively.Field application also indicates that the flow parameter of stochastic medium theory of ore drawing can reflect flow characteristics of caved ore and rock well.The new method for measuring granules flow parameters can significantly improve the adaptability of SMTOD in engineering application.