THE LAST STAGE OF CEMENT MAKINGIS CALLED FINISH GRINDING. THEY ADD SOME GYPSUMTO THE...
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THE LAST STAGE OF CEMENT MAKING
IS CALLED FINISH GRINDING. THEY ADD SOME GYPSUM
TO THE CLINKER. THE PRECISE AMOUNT VARIES WITH THE TYPE OF CEMENT
THEY'RE MAKING. GYPSUM DELAYS
THE CEMENT'S SETTING TIME, SO IT CAN BE WORKED FOR UP
TO TWO HOURS BEFORE HARDENING. THE CEMENT MILLS
ARE CALLED BALL MILLS BECAUSE THEY CONTAIN
METAL BALLS, ABOUT 150 TONS OF THEM,
IN THE LARGEST MILL. AS THE MILL ROTATES, THE BALLS CRUSH AND GRIND
THE CLINKER AND GYPSUM INTO A FINE POWDER
IS CALLED FINISH GRINDING. THEY ADD SOME GYPSUM
TO THE CLINKER. THE PRECISE AMOUNT VARIES WITH THE TYPE OF CEMENT
THEY'RE MAKING. GYPSUM DELAYS
THE CEMENT'S SETTING TIME, SO IT CAN BE WORKED FOR UP
TO TWO HOURS BEFORE HARDENING. THE CEMENT MILLS
ARE CALLED BALL MILLS BECAUSE THEY CONTAIN
METAL BALLS, ABOUT 150 TONS OF THEM,
IN THE LARGEST MILL. AS THE MILL ROTATES, THE BALLS CRUSH AND GRIND
THE CLINKER AND GYPSUM INTO A FINE POWDER
Full Transcript
00:00:01.000 --> 00:00:04.071
THE LAST STAGE OF CEMENT MAKING
IS CALLED FINISH GRINDING.
00:00:04.073 --> 00:00:06.142
THEY ADD SOME GYPSUM
TO THE CLINKER.
00:00:06.144 --> 00:00:07.812
THE PRECISE AMOUNT VARIES
00:00:07.814 --> 00:00:10.999
WITH THE TYPE OF CEMENT
THEY'RE MAKING.
00:00:10.019 --> 00:00:12.001
GYPSUM DELAYS
THE CEMENT'S SETTING TIME,
00:00:12.023 --> 00:00:14.559
SO IT CAN BE WORKED FOR UP
TO TWO HOURS BEFORE HARDENING.
00:00:14.561 --> 00:00:16.083
THE CEMENT MILLS
ARE CALLED BALL MILLS
00:00:16.832 --> 00:00:18.834
BECAUSE THEY CONTAIN
METAL BALLS,
00:00:18.836 --> 00:00:22.108
ABOUT 150 TONS OF THEM,
IN THE LARGEST MILL.
00:00:22.011 --> 00:00:24.512
AS THE MILL ROTATES,
00:00:24.514 --> 00:00:27.251
THE BALLS CRUSH AND GRIND
THE CLINKER AND GYPSUM
00:00:27.253 --> 00:00:28.854
INTO A FINE POWDER.
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Movie Summary
Television series that documents how various everyday products are made.
