The Synthesis And Characterization Of Ferrous Sulfide And Preliminary Research On The Deactivation

In recent years,fire and explosion accidents occurred frequently due to the self-ignition of ferrous sulfide.Through researches on its spontaneous combustion phenomenon,the spontaneous combustion active ferrous sulfide samples were prepared.Then the contents of the prepared samples were detected and its apparent morphology was characterized.At last,deactivation method was done to weaken its spontaneous combustion activities.The main researches were as below.Firstly,four methods were applied in this paper to synthesize ferrous sulfide,such as liquid reaction,gas-solid reaction,gas-liquid reaction and homogeneous reaction.Then,the product was characterized and analyzed by XRD,electron microprobe and chemical titration method.As the XRD detection ways can not be used to analyse the amorphous partical material and the end point of titration is difficult to judge,so the electron microprobe detection way was the best method to determine the compositions of ferrous sulfide sample.By the electron microprobe detection method,results showed that the purity of ferrous sulfide made by liquid,gas-liquid,gas-solid reaction were more than 97%.Secondly,the influences of particle size and sulfur contents on the heating process of ferrous sulfide were investigated to simulate the spontaneous combustion process of the ferrous sulfide.Results showed that the particle size had a influence on spontaneous combustion reaction of ferrous sulfide.The smaller the particle was,the more obviously the heating process of ferrous sulfide was.The sulfur exacerbated the self-heating and spontaneous combustion of ferrous sulfide,and when the content of sulfur was 45%,the self-heating was optimal.At last,ferrous sulfide deactivation patent technology was proposed,and the ferrous sulfide deactivation process was designed.A smaller device depended on the deactivation patent technology was used to study the deactivation process,and DTA-TG detection method was applied to analysze the effect of the deactivation.Results showed that after deactivation the self-heating temperature of the sample increased greatly while enthalpy is lower,and the self-heating temperature was above 120℃.Compared with the traditional inhibition of spontaneous combustion of ferrous sulfide hazard,our deactivation technology had many advantages such as convenient and safe operation,shorter operation time,lower cost,no pollution and so on.So this deactivation method can be worked as a reference to solve the problem of ferrous sulfide spontaneous combustion disasters,and of course,the deactivation device and method has the practical significance and promotion value.