See:ball stamp
a. A process that occurs in the cementite constituent of steels on
prolonged annealing at 650 to 700 degrees C. CTD
b. The operation of forming balls in a puddling furnace.
Syn:nodulizing
Rock or formations that, when drilled, produce cuttings and sludge that
tend to collect on, and adhere to, borehole walls and drill-stem equipment
in sticky or gummy masses. CF:gummy; sticky. Long
a. A kind of reverberatory furnace used in alkali works. Fay
b. A furnace in which piles or fagots of wrought iron are placed to be
heated preparatory to rolling. Fay
A tool used in collecting the iron in a puddling furnace into a mass,
preparatory to taking it to the hammer or squeezer; a rabble. Fay
a. A sedimentary rock containing large argillaceous nodules of ironstone.
AGI
b. Nodular iron ore.
A laboratory instrument used for measuring the relative weight strength of
an explosive material. Also, a test in which a standard weight of
explosive is placed within a small borehole fitted with a projectile. The
mortar, suspended on a pendulum, recoils upon detonation. The recoil is a
measure of the weight strength in percentage (relative to a standard whose
value is 100) or pendulum deflection. Meyer
A smokeless powder consisting essentially of soluble cellulose nitrates
and nitroglycerin in approx. equal parts. Syn:balistite
Webster 3rd
a. Jasper showing concentric red and yellow bands.
b. Jasper occurring in spherical masses.
A rotating horizontal cylinder with a diameter almost equal to the length,
supported by a frame or shaft, in which nonmetallic materials are ground
using various types of grinding media such as quartz pebbles, porcelain
balls, etc. Syn:air-swept ball mill; cannonball mill; jar mill.
Crushed particles of a given size range are placed in a ball mill; the
reduction in size of particles for a given number of revolutions of the
mill is interpreted in terms of a grindability index. Lewis
A method of grinding and mixing material, with or without liquid, in a
rotating cylinder or conical mill partially filled with grinding media
such as balls or pebbles. ASTM
A grindability method based on the principle that all coals are ground to
the same fineness, about that required for pulverized fuels, and then
using the relative amounts of energy required for this reduction in size
as a measure of grindability. Mitchell
Ball-Norton magnetic separator
Dry separator for coarse ore, in which one or two nonmagnetic drums rotate
outside a series of fixed magnets alternating in polarity.
Pryor, 3
a. Common name for nodules, esp. of ironstone. Arkell
b. In fine grinding, crushing bodies used in a ball mill. Cast or forged
iron or steel, or alloy of iron with molybdenum or nickel, are used,
mainly spherical; various other shapes are favored locally, e.g., concave.
Sizing and finishing a hole by forcing a ball of suitable size, finish,
and hardness through the hole or by using a burnishing bar or broach
consisting of a series of spherical bands of gradually increasing size
coaxially arranged. Also called ball burnishing, and sometimes ball
broaching. ASM, 1
A rock-crushing stamp whose stem is the piston rod of a steam cylinder.
Syn:ball head
a. An ancient term for ironstone, North Staffordshire, U.K.
b. A large crystalline mass of limestone containing coral in position of
growth, surrounded by shale and impure bedded limestone.
See also:caballa ball
c. A nodule or large rounded lump of rock in a stratified unit; specif. an
ironstone nodule in a coal measure. Syn:ball
A stratum in which siderite concretions occur; also, the ore itself.
Hess
Underclay with nodular concretions. Arkell
Corn. A woman employed in the mines. Standard, 2