Research On Oxidation To Self-heating Of Sulfide Ore Heap And Mine Dust Layer

In order to study whether oxidation of ore heap and its internal depositional mine dust will influence each other or become explosion source of sulfide mine dust on the high sulfide deposit.This topic makes simulated experiment and factor influencing factors experiment of sulfide ore heap and mine dust to study oxidation process of them by the original design oxidation mechanism. Exploring oxidized law of sulfide ore heap and mine dust by recording the temperature(environment temperature, center internal temperature, the temperature of the surface and peripheral internal ore heap, the environment and the internal temperature of mine dust layer) and sulfur dioxide concentration, and finding out when and which temperature will ore heap and mine dust layer react to generate heat and produce sulfur dioxide because of violent reactions. Make a comparison of the two results to confirm who is main. Here are the main experimental conclusion:1. In the simulated experiment, it indicates that the greater are the sulfur content, the lower are the reaction temperature that the ore heap and mine dust layer are more likely to start reaction and shows that the higher are the sulfur content, the faster and more severe are the ore heap and mine dust layer late reaction.The reaction temperature and the gas temperature mine dust layer is much larger than the ore heap,it shows that ore heap oxidation plays a role of main influence, there are following reasons: firstly, quality and quantity of mine dust layer in ore heap is much fewer than the ore heap; secondly, mine dust layer is composed of mutual bonding dense aggregation of so small particle size mine dust that internal air channel is very low and it is difficult to contact with air mine; thirdly, mine dust layer easily absorb water; Fourthly,material structure and crystal structure have great changes because ore after strong external shocks into mine dust,.2. The primary and secondary relations of influencing factors of ore heap is sulfur content >temperature gradient>lumpiness, when level of the temperature gradient is highest but level of sulfur content and lumpiness are lowest, the experiment index is best, and it also summaries the relationship between three factors with the reaction temperature equation. In the same case of other two factors, when sulfur content is higher, ore heap is easier to react;Similarly, when the lumpiness is smaller, ore heap is easier to react.3. The primary and secondary relations of influencing factors of mine dust is sulfurcontent > thickness>particle size, when level of sulfur content thickness particle size are all lowest, the experiment index is best, and it also summaries the relationship between three factors with the reaction temperature equation.; Under the same condition of other two factors,the higher is sulfur content, the mine dust layer is easier to react to produce heat and even be on fire. Similarly, the greater is the thickness, the mine dust layer is easier to react to produce heat and even be on fire; By the same token, when the particle size is larger, the mine dust layer is easier to react to produce heat and even be on fire. The center part of mine dust layer on the bottom start reaction firstly, then the center part of the surface start to react.These conclusions take large guiding significance for the prevention of ore heap reacting to fire and mine dust layer reacting to fire on high sulfur metal ore deposits hot lead to spontaneous combustion.