Feb 1, 1996 . Pakistan has recently passed laws greatly limiting child labor and . Like many manufacturers, he recruits children for his workshop almost . The work pays poorly at the best of times, and on occasion it does not pay at all. .. entering and exiting the brick factories, steel mills, and stone crushing plants at all.
A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing . Ball mills are also used in pyrotechnics and the manufacture of black powder, but cannot be used in the preparation of some pyrotechnic mixtures.