一种预测矿仓硫精矿自燃临界堆积厚度的方法

A method for predicting critical accumulative thickness of sulfide concentrate spontaneous combustion in storage

提出矿仓硫精矿自燃临界堆积厚度的概念,并介绍一种用于测算矿仓硫精矿自燃临界堆积厚度的金属网篮交叉点温度法。用自行组装成的一套实验系统测试高硫精矿及硫铁精矿2种矿样在不同恒温条件下的自热性质;基于Frank-Kamenetskii理论模型解算出2种矿样在环境温度分别为5,10,15,25,30℃条件下的自燃临界堆积厚度,并应用于铜陵有色冬瓜山铜矿矿仓硫精矿自燃的危险性分析。研究结果表明:硫铁精矿的自燃临界堆积厚度较高硫精矿的小,在不同环境温度下,2种矿样的自燃临界堆积厚度也不同,其值随着环境温度的升高而减小;该方法具有测试成本低、耗时少、实验的可重复性强等特点,通过对自燃临界堆积厚度的测算可以为预防矿仓硫精矿自燃火灾的发生提供重要理论依据,从而保证矿山生产的顺利开展。

The concept of critical accumulative thickness of sulfide concentrate spontaneous combustion in storage was put forward,and a wire-mesh basket crossing point temperature method for calculating the value was introduced.An experimental system was assembled,and the self-heating properties of sulfur-rich and iron-rich sulfide concentrates were tested under different constant temperature conditions.Based on Frank-Kamenetskii model,corresponding critical accumulative thickness of two samples at 5,10,15,25,and 30 ℃ were gained;and the spontaneous combustion phenomenon of sulfide concentrate in Dongguashan copper mine was analyzed using this method.The research results show that critical accumulative thickness of iron-rich sulfide concentrate is smaller than that of sulfur-rich concentrate;the thickness are also different at diverse temperatures and become smaller with the temperature rising.This method has some advantages,such as low test cost,little time-consuming and good test repeatability and it can provide theoretical basis for preventing spontaneous combustion of sulfide concentrates through calculating critical accumulative thickness,and ensure smooth production of the mine.