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Clean product

Remainder

Ref. No. 258. Ramnagar Seam. Ash 13.6 per cent.

Weight. 60

Ash

7.6

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Remainder

Clean product

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Weight. 40
Ash

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22.6

Weight.
Ash

Sulphur

40

70

75

8.6 9.2

25.6

30

25.3

Ref. No. 260. Ramnagar Seam. Ash 16.7 per cent.

Weight. 60

Ash

10.8

25

[blocks in formation]

2 per cent.

80

9.8

20

27.7

26.8 28.8 31.1 ""

75

12.5

85 per cent.

10.5

25

29.3

15 per cent.

80

13.1

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20

31.1

II. NON-COKING COALS OF THE RANIGANJ FIELD.

A typical analysis of coal from the Barakar stage of the Damuda series in the Raniganj field is :

Ash
Moisture

Volatile Matter

Fixed Carbon

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Very few samples from these beds have been tested. The coals which have been examined are non-coking and are incapable of yielding coking products. On account of the fairly high calorific values of the inferior constituents of the coals, cleaning for general purposes is not likely to be profitable.

100

17 per cent.

4 33 46

III. COKING TERTIARY COALS OF ASSAM.

The Tertiary coals of Assam are coking. They have very low ash contents, and their chief impurity is sulphur. A typical analysis of the coals is as follows:

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The occurrence of the sulphur has been investigated. It is found to be fairly evenly distributed throughout the coal substance. This is shown by the following results of heavy liquid separation :

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Sulphur

Ash.
Moisture

Volatile Matter
Fixed Carbon

Ref. No. 401.

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Weight,

per

cent.

59.6

22.6

17.8

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[blocks in formation]

3.2 per cent.

1.30

1.45 100-0

82.2

CUMULATIVE.

Ash, Sulphur,

per

per

cent.

cent.

The weights of those portions, separated by liquids of various specific gravities, with their analyses, are shown under the heading "Direct." The weights and analyses of those portions obtained in the above direct manner, are successively combined in that part of the table headed "Cumulative."

1.5

1.5

1.8

A better separation than the above is not possible by any physical process. It is concluded therefore that the Assam coal cannot be cleaned. Mixed with Jharia coal the Assam coal gives a satisfactory coke, but the difficulties of mining and the great distance from the iron ore deposits are factors which have to be noted when the Assam coals are being considered as possible reserves of coking coal.

A specimen sample, Ref. No. 313, from another colliery, is even more homogeneous and has the following analysis :

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IV. NON-COKING COALS OF THE CENTRAL PROVINCES, AND BIHAR AND ORISSA.

Pench valley.

These coals are all of the sub-bituminous, non-coking type. A typical analysis is as follows:-

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Ash.
Moisture

Volatile Matter.

Fixed Carbon

Specific Gravity of liquid on which it floats.

The coals contain a very small proportion of vitrain and are profusely banded with fusain. Vitrain picked out by hand has the following analysis:

Ref. No. 359V.

1.50

1.57

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In the test for volatile matter the vitrain gives a weakly fritted, non-swollen residue. The other constituents of the coal are entirely non-coking. Hence the coal is incapable of being cleaned to yield coking products. The constitution of the coals is shown by the following results of heavy liquid separation:

B. Th. U.

19 per cent.

6

29

46

Ref. No. 359. Face sample. Ash 20·8 per cent. B. Th. U.

10,500.

Weight,
per
cent.

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0.8 per cent.
10.9

34.5
53.8

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Ash,

per

cent.

12.6

11,700

65.0

28.4

9,600

81.4

15.8

42.9 7,550 100.0 20.8

12.6

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CUMULATIVE

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B. Th. U.

11,700

11,200

10,500

calorific

The poorest of the constituents have fairly high values. For this reason cleaning for general purposes is not likely

to be profitable. Further, the surface properties of the constituents are such that an unusually large proportion of reagents is required to secure flotation of the better constituents.

Sasti; Ghugus; Tulsi, Bisrampur

These coals are all of the sub-bituminous, non-coking type and are considered to be not profitably cleanable.

Talchir.

The seams being worked are of excellent quality. The coal is sub-bituminous and is incapable of being cleaned to yield coking products.

Ash.
Moisture

Volatile Matter.

Fixed Carbon

Bhudyar Khad, Daltonganj.
Ref. No. 405.

Ash.
Moisture

Volatile Matter.

Fixed Carbon

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13.5

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This is a sub-bituminous coal and is entirely non-coking.

It is of interest to note that another sample, Ref. No. 406, from Debi Rai Khad, which is in the same district as Bhudyar Khad, has a remarkably different constitution and indicates that coal of more highly bituminous nature may be found in this area; the analysis of this sample is as follows:

Ref. No. 406.

per cent.

1.2

21.5

63.8 99

The coal contains a small proportion of vitrain which is strongly coking. It is not commercially cleanable for coking because the proportion of coking constituents is very small.

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Karanpura.

This field was not sufficiently developed to allow of representative samples being taken. Examination of specimens from South Karanpura shows that the coal from this portion of the field is sub-bituminous and non-coking.

V. NON-COKING TERTIARY COALS OF THE PUNJAB AND NORTH-WEST FRONTIER PROVINCE.

Maidan Range Coalfield, Punjab.

A typical analysis of coal from this field is given

Ash.
Moisture

Volatile Matter

Fixed Carbon

Specific Gravity of liquid on which it floats.

1.40

1.50

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Sulphur .

4 per cent.

Results of heavy liquid separation are as follows:

Ref. No. 645. Face Sample.

analysis :

Specific
Gravity of
liquid in

which it
sinks.

Sulphur

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1.40

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1.50

Ash.
Moisture

Volatile Matter

Fixed Carbon

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88.4

Seven samples from

Weight, Ash, Sulphur, Weight,

per

per

cent.

cent.

6.1

5.5

DIRECT.

per

cent.

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4.& per cent.

per

cent.

88.4

94.5

100.0

below :

6 per cent.

4

43

47

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100

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CUMULATIVE.

Ash,

per

cent.

These figures show that even the better constituents of the coal contain a fairly large proportion of sulphur. Hence no cleaning process can give a product containing appreciably less sulphur than does the run-of-mine coal. The coals are non-coking.

1.9

2.1

Eastern End of Salt Range, North-West Frontier Province.
this field have the following mean

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100.0

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23.6 per cent.

5.0

34.6

36.8

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4.6

39

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