發(fā)布時間：2018-07-14 18:30

【摘要】：為揭示不同強度的機械力作用對硫化礦石自燃的影響機理,從某高硫礦山采集具有代表性的硫化礦樣,在室內(nèi)開展硫化礦石的機械球磨實驗。聯(lián)合運用掃描電鏡(SEM)、X線衍射(XRD)等測試技術表征礦樣在經(jīng)歷100,200,300,350,400和450 r/min等轉速表征的不同強度的機械力作用下的表觀形貌、微觀結構等的演變規(guī)律;進一步開展礦樣在不同強度的機械力作用下的恒溫恒濕氧化實驗,并對比各個礦樣的氧化質(zhì)量增大率。研究結果表明:硫化礦石在經(jīng)歷不同強度的機械力作用后,形成細小的細微顆粒并發(fā)生集聚效應;隨著轉速提高,硫化礦石的晶格畸變率增大,晶粒粒度降低,氧化速率明顯加快。這表明硫化礦石在外界不同強度的機械力作用下,其化學反應活性增強,更加容易發(fā)生氧化自熱,進而在一定環(huán)境條件下引發(fā)自燃火災。
[Abstract]:In order to reveal the mechanism of influence of mechanical force of different strength on spontaneous combustion of sulfide ore, the mechanical milling experiment of sulfide ore was carried out in laboratory from a representative sulphide ore sample collected from a high sulfur mine. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and microstructure of mineral samples under the action of mechanical force of different strength such as 100200300350400 and 450 r/min. The experiments of constant temperature and humidity oxidation of ore samples under different mechanical strength were carried out, and the increasing rate of oxidation mass of each sample was compared. The results show that the fine particles are formed and agglomerated by mechanical force of different strength, and the lattice distortion rate of sulfide ores increases with the increase of rotational speed, and the grain size decreases with the increase of rotational speed. The oxidation rate was accelerated obviously. This indicates that the chemical reaction activity of sulphide ore increases under the action of mechanical force of different external strength, and it is more likely to occur oxidation self-heating, and then to cause spontaneous combustion fire under certain environmental conditions.
【作者單位】： 福州大學環(huán)境與資源學院;
【基金】：國家自然科學基金資助項目(51304051) 福建省自然科學基金資助項目(2016J01224) 福建省高校杰出青年科研人才培養(yǎng)計劃項目(83016018)~~
【分類號】：TD752.2

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