RU95121949A - Electron-paramagnetic resonance-spectrometric method of prediction of outburst-risky coals - Google Patents

Abstract

FIELD: coal industry. SUBSTANCE: proposed electron-paramagnetic resonance-spectrometric method of prediction of outburst-risky coals accelerates prediction procedure increasing authenticity of prediction and expanding range for the whole series of metamorphism of coals. This is achieved by registration of spectra of electron-paramagnetic resonance fractions of coals differing in size of d-angle grain in interval (0.05-0.01-0.16-0.25-0.5-1.0) mm, by determination of three regions of dependence of rate of growth V(d) of additional narrow signal ΔHon size of grain d under vacuum treatment of sample (1.0-0.1 Pa):1) region of fast fall of V(d) at small d<d≃ (0.05-0.1)mm; 2) region of nonmonotonous change of V(d) with d within interval d<d≅d≃ (0.16-0.25-0.5)mm; 3) region of slow changes of V(d) for d>d. In case of monotonous drop of V(d) within entire interval of sizes d sample is related to nonrisky coals. In case of nonmonotonous change of V(d) in second region sample is related to potentially dangerous coals. If degree of outburst risk grows with decrease of extent of Δd = d- dof second region and with moderation of fall of V(d) in third region, stoppage of fall or increase of V(d) with increase of d in third region sample is related to very risky coals. EFFECT: accelerated prediction procedure increasing authenticity of prediction and expanding range for the whole series of metamorphism of coals.

Claims (1)

The invention relates to electronic paramagnetic resonance and can be used in the coal industry in predicting the outburst hazard of coal seams. The proposed method accelerates the process of predicting the outburst hazard of coal, increasing the reliability of the forecast and expanding the range for the entire range of coal metamorphism. This is achieved by recording the EPR spectra of coal fractions that differ in size d, coal grain in the interval (0.05 - 0.1 - 0.16 - 0.25 - 0.5 - 1) mm, by determining three areas of dependence on the grain size d of speed the growth of V (d) of an additional narrow signal - ΔH _у during evacuation of the sample (1 - 0.1 Pa): 1 - the region of rapid fall of V (d) for small d <d _c1 = ≈ (0.05 - 0.1) mm, P is the region of nonmonotonic variation of V (d) for d in the interval d _c1 <d≥≈ (0.16 - 0.25 - 0.5) mm, W is the region of slow changes in V (d) for d> d _c2 , at in the case of a monotonic decrease in the velocity V (d) over the entire size interval d about azets attributed to non-hazardous coals, in the case of non-monotonic changes V (d) in P-field pattern referred to potentially dangerous the coals, with the degree of outburst increases with decreasing length Δd = d _c2 - d _c2 region P and weakening decay V (d) in W -regions that stop the decline or increase of V (d) with increasing d in the W-region, the sample is classified as a very dangerous coal.