The flotation process has been found quite successful as it improved the grade of ore significantly by reducing the gangue
material of the ore.
The advancing length of each block was 72.5 m, with a mining height of 5 m; in addition, the protective coal pillar between the blocks was about 5 m in length, and the backfilling ratio of gangues
in the gob was about 80%.
During the coal production, lots of carbonaceous shales which are the main part of gangues
are often cut together with coals and transported to the ground.
is a concrete material utilizing gangues
as a coarse aggregate and cement as a cementing material, mixed with a certain amount of additives.
Rock block N subsides with the compaction of coal gangue
in the lower caving zone (caving gangue
is irregularly accumulation in goaf).
Foi principalmente a partir do seculo XX que tal Escola investiu suas pesquisas nas questoes da violencia e criminalizacao, buscando compreender os fenomenos juvenis das gangues
, analisando o aspecto do desvio social e de suas relacoes com os processos de adaptacao a vida metropolitana.
Diferentemente das sociedades Inuits ao seio das quais o "comunismo sexual" englobava "toda a mentalidade do grupo", na sociedade ocidental contemporanea estes tipos de praticas estao circunscritos ao seio de espacos bem delimitados e, como as gangues
estudadas por Thrasher, produzem regras e valores eticos especificos a cada micro grupo, muitos se desenvolvendo a margem da sociedade dominante.
As the material is mined and crushed down to golf ball-size pellets, the x-ray sorting can distinguish the good from the bad, will blow the gangue
material off to one side with compressed air, and blow the high-grade material off to another circuit for processing.
Since the mid-1980s, the reclamation technologies including gangue
filling, flyash filling, and digging deep to fill shallow achieved success in Huaibei coal mine area.
The coal production of China now ranks top in the world, and so there is the biggest coal gangue
ores are complex assemblages of mineral phases, some being economically valuable and others being considered as uneconomic, gangue
material or even as penalties.