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Development of a Safer, More Efficient Hydraulic-Based Technique for Rapid Excavation of Coal, Rock, and Other Minerals.

PB245343

Publication Date	1975
Personal Author	Chatterton, N. E.
Page Count	112
Abstract	Results of the development and in situ testing of a prototype hydraulic mining machine that uses a water jet with solid particles added are discussed. Of the 124 tests performed with the excavator, 89 were carried out to evaluate the ability of the excavator to cut in situ rock. Several different particle materials, which ranged from coal to steel shot, were injected; target material consisted of limestone and concrete. The study disclosed that solid particles could be injected into a high-velocity stream without great difficulty at reasonable feed rates and without significant deterioration in the downstream jet. The addition of particles did not appear to improve the cutting ability of the jet as compared to the use of water alone. The cutting ability appeared to increase as the mass of the particle was increased. At the pressures tested (i.e., P = or < 15,000 psi), and even with the addition of particles, hydraulic jets did not appear to be as energy-efficient excavating hard rock as other techniques.
Keywords	Excavating equipment Hydraulic jets Hydraulic mining Hydraulic equipment Particles Injection Fragmentation Prototypes Rapid excavation
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Teledyne Brown Engineering, Huntsville, Ala.; Bureau of Mines, Twin Cities, Minn. Twin Cities Mining Research Center.
Document Type	Technical Report
Title Note	Final rept. Jun 73-Mar 75.
NTIS Issue Number	197602
Contract Number	H0232062

Development of a Safer, More Efficient Hydraulic-Based Technique for Rapid Excavation of Coal, Rock, and Other Minerals.

Development of a Safer, More Efficient Hydraulic-Based Technique for Rapid Excavation of Coal, Rock, and Other Minerals.
PB245343

Publication Date	1975
Personal Author	Chatterton, N. E.
Page Count	112
Abstract	Results of the development and in situ testing of a prototype hydraulic mining machine that uses a water jet with solid particles added are discussed. Of the 124 tests performed with the excavator, 89 were carried out to evaluate the ability of the excavator to cut in situ rock. Several different particle materials, which ranged from coal to steel shot, were injected; target material consisted of limestone and concrete. The study disclosed that solid particles could be injected into a high-velocity stream without great difficulty at reasonable feed rates and without significant deterioration in the downstream jet. The addition of particles did not appear to improve the cutting ability of the jet as compared to the use of water alone. The cutting ability appeared to increase as the mass of the particle was increased. At the pressures tested (i.e., P = or < 15,000 psi), and even with the addition of particles, hydraulic jets did not appear to be as energy-efficient excavating hard rock as other techniques.
Keywords	Excavating equipment Hydraulic jets Hydraulic mining Hydraulic equipment Particles Injection Fragmentation Prototypes Rapid excavation
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Teledyne Brown Engineering, Huntsville, Ala.; Bureau of Mines, Twin Cities, Minn. Twin Cities Mining Research Center.
Document Type	Technical Report
Title Note	Final rept. Jun 73-Mar 75.
NTIS Issue Number	197602
Contract Number	H0232062