Handbook of ore dressing, equipment and practice by Allen Arthur Watts 1879-

Author:Allen, Arthur Watts, 1879- [from old catalog]
Language: eng
Format: epub
Tags: Ore-dressing
Publisher: New York [etc.] McGraw-Hill Book Company, Inc.
Published: 1920-03-25T05:00:00+00:00

The Operation of High- and Low-Speed Chilean Mills is given in Table LVI.

Fio. 104.—Denver quarta mill."

HANDBOOK OF ORE DRESSING

S5 O

<

o o

Q H

I

Q

I

O

H

PQ o <

o O

5

o to

CO CO O O

O CO

d t>^

»0 CO

OS lO

»o »o

CO c«

o o to o d o Oi d

00 b- CO t*

to »-i 00

i>. o to ■^

• CO • ■

"^ o CO

CO

o

CO

to

CO

o to 00 d

o to

to

CO

00

b- ob

CO CO

0.

3

The Denver Quartz Mill (Fig. 104) consists of four rollers with convex edges running in a concave die. A scouring action is claimed, which favors the subsequent amalgamation of gold. The mills are built in three standard sizes, viz.: 3 ft. 6 in., 5 ft. 6 in., and 8 ft. in diameter. The muller rings and mortar liners are made of steel or hard iron.

The Himtington Mill consists of a circular pan with a central

Fia. 105.—Huntineton mill with ii

spindle from which are suspended four arms carrying rollers. These rollers operate centrifugally and crush the material against a ring die. A screen is arranged just above the level of the rollers. This type of mill has a limited application, on account of the necessity for a smaller feed than is required by many other secondary crushers, but has been used largely as an amalgamator and crusher on small properties. A diagram of this type of mill will be found in Fig. 105 and details of operation in Table LVII.

HANDBOOK OF ORE DRESSING

Table LVII. — Huntington-Mill Data"

Capacity in Tons per 24 Hours and Speed of Countershaft for

Different Feeds

The GiiflBn Mill operates by means of a single roller attached to a vertical shaft which is thrown out by centrifugal force against a ring die. Details of the operation of 16 of these mills, since replaced by Krupp ball mills, are given in Table LVIII. The fineness of the product will be noted. The mill has found small favor among operators, on account of constant necessity for repairs and renewals.

GRINDING IN MILLS

143

Table LVIII. — Griffin-Mill Data^

Mine Gt. Boulder Perseverance.

Size of mill No. 11.

Diameter of crushing roll 15 in.

Diameter of ring die 30 in.

R.p.m. of shaft 198

Life of die rings 18 days

Life of roll bodies 6 months

Life of roll tires v 9 days

Size of feed To pas5 IH-in. ring

H.p. consumption 18

Output 37 tons per day

Screening 14 X 14 X 22 I. S. W. G.

The Sturtevant Ring Roll Mill (Fig. 106) takes a feed up to IJ^ in. In the operation of this type of mill the ring is revolved and the rolls are held against the ring by pressure. The product from the mill may be screened and the oversize returned for further reduction (see Fig. 107).

The Marathon Mill (Fig. 108) consists of a grinding drum, mounted on a cradle in such a way that fall between feed and discharge levels may be adjusted to suit requirements. The

grinding media consist of loose steel bars of a longitudinal dimension equal to the length of the mill. The shell is lined with steel plate having corrugations which tend to produce a wave

Fiu. 106.—Sturtevant riog-rul! mill." F«d enters hopper at H.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.