75results about How to "Reduce chunk rate" patented technology

The invention provides an explosion method for an open-cast mining underground goaf position. The general form of the goaf is primarily mastered by the goaf detection technology; according to the detected goaf form, through holes are formed in a top plate in the center of the goaf and the surrounding turning points to obtain the accurate goaf form; the thickness of the top plate and the inner height of the goaf are mastered; according to the thickness of the top plate and the inner height of the goaf, the through holes and the non-through holes of the top plate of the goaf and the whole section height blast holes around the goaf are designed on the top and the surrounding positions of the goaf; the explosive quantity of the holes of the goaf position is calculated and corrected, construction of hole distribution and explosive charging are carried out; the whole section height blast holes are charged according to the explosive quantity of the non-goaf position; the explosive in the surrounding boundary holes is firstly detonated; then, the explosive in the goaf holes are successively detonated. According to the explosion method for the open-cast mining underground goaf position, which is disclosed by the invention, the explosion effect is greatly improved, the explosion product satisfies the requirement of the next working procedure, the block rate is lowered by 80%, the foundation is reduced by 50%, the explosion effect of the non-goaf position is achieved, the explosion quality is subjected to qualitative leap, and the huge difficulty restricting the outdoor production is solved.

The present invention discloses a mining- machine- based slowly inclined thin ore vein mechanized continuous mining method, a middle-section tape transport lane is arranged along an ore body, false inclination uphill is tunneled at intervals of a certain distance; a continuous rib pillar and a top pillar or a bottom pillar are arranged between adjacent back- mining units; accurate mining cutting is started from the lower middle section tape transport lane, a mining machine passes, from the back- mining unit edge position, through the top pillar or the bottom pillar for tunneling left and right false inclination uphill to the upper middle section tape transport lane; back- mining is started from the position of the tape transport lane uphill from the right side, the ore body is back mined by the mining machine to left side uphill, the mining machine is in no load, and descends along the left false inclination uphill to the bottom of the back- mining units, the ore body is back mined by the mining machine from left side uphill position to right side uphill, then the mining machine is in no load, and ascends from the right side uphill to the position near the tape transport lane, the mining is performed in the anti-clockwise direction circulation way, a central position reserved ore pillar is left; ores are loaded onto a belt by a carry-scraper for conveying to a ground surface main ore bin. The conveying is easy, work security is high, back- mining efficiency is high, and production capacity is large.