This standard specifies the method summary, apparatus, test procedures and result calculation for the determination of the coke breeze content and size consist of coke for metallurgy with size larger than 25mm.
This standard is applicable to the determination of coke breeze content and size consist of large coke with size larger than 40 mm, of large and medium coke larger than 25 mm and medium coke of 25 to 40 mm.
2 Normative References
GB 1997 Sampling and preparation of coke samples
3 Method Summary
The metallurgical coke samples are sieved with a mechanical sieve, and the mass of each particle fraction is calculated as a percentage of the total mass of the sample, that is, the size consist. The mass of coke less than 25 mm to a percentage of the total mass of the sample is the coke breeze content.
4 Apparatus
4.1 Square hole mechanical sieve
Performance and main specifications of square hole mechanical sieve:
Figure 1 Schematic diagram of five-stage vibrating sieve
1—base; 2— the 5th layer sieve; 3—the 4th layer of 25×25 sieve frame; 4—the 3th layer of 40×40 sieve frame; 5—the 2rd layer of 60×60 sieve frame; 6—the first layer of 80×80 sieve frame; 7—hanger rod; 8—tie bar of sieve frame; 9~10—eccentric wheel of drive shaft; 11~12—frame member and long screw; 13—first layer stream; 14—second layer stream; 15—3rd layer stream; 16—4th layer stream; 17—bracket; 18~19—motor hook wheel; 20—motor frame
4.2 Technical requirements for square-hole sieve
4.2.1 The sieve is a punching sieve of 1630mm×700mm, and the sieve hole is square (as shown in Figure 2). The dimensions are shown in the following table.
Figure 2
Sieve grade a b c d Steel plate thickness Number of holes Remarks
mm mm mm mm mm mm Rectangular Broad
80 32.5 25 72.5 15 2.0 16 7/6 For example, 7/6: the number of broad holes is 7, arranged in 6 alternately
60 20 20 57.5 15 2.0 21 9/8
40 30 30 55.0 10 1.5 31 13/12
25 25.5 24 40.0 8 1.5 47 20/19
4.2.2 The sieve is punched with a puncher. After punching, the edge of the sieve is not allowed to be flattened with hammer. When installing, punch the burrs down and use a sand wheel to level the burrs.
4.2.3 All punching holes must be completely included in the effective area of 1630mm × 690mm.
4.2.4 If the length of any side of the sieve of each grade exceeds 2% of the nominal value, it is a waste hole. When the number of holes exceeds 10% of the total number of sieve holes, the sieve shall be replaced.
4.3 Measurement scale: the sensitivity is 0.1kg. Correct the zero point before each test.
5 Sampling
Sampling shall be carried out according to the requirements in GB/T 1997.
5.2 Where the sample is found to be so hydrated that affects the test result, it shall be properly treated before testing.
1 Subject Content and Applicable Scope 2 Normative References 3 Method Summary 4 Apparatus 5 Sampling 6 Test Procedure for the Coke Content and Size Consist 7 Result Calculation Annex A Original Record of Coke Breeze Content and Size Consist (Reference) Additional Explanation
1 Subject Content and Applicable Scope
This standard specifies the method summary, apparatus, test procedures and result calculation for the determination of the coke breeze content and size consist of coke for metallurgy with size larger than 25mm.
This standard is applicable to the determination of coke breeze content and size consist of large coke with size larger than 40 mm, of large and medium coke larger than 25 mm and medium coke of 25 to 40 mm.
2 Normative References
GB 1997 Sampling and preparation of coke samples
3 Method Summary
The metallurgical coke samples are sieved with a mechanical sieve, and the mass of each particle fraction is calculated as a percentage of the total mass of the sample, that is, the size consist. The mass of coke less than 25 mm to a percentage of the total mass of the sample is the coke breeze content.
4 Apparatus
4.1 Square hole mechanical sieve
Performance and main specifications of square hole mechanical sieve:
Dimensions: length 2100mm × width 1340mm × height 1310mm (Figure 1);
Number of sieve layers: 4;
Total weight of the sieve: about 500kg;
Inclination angle of the sieve: 11.5 °;
Amplitude of the sieve: 3 ~ 6mm;
Motor: 2.2kW, 450r/min;
Speed ratio: 1:1.
Figure 1 Schematic diagram of five-stage vibrating sieve
1—base; 2— the 5th layer sieve; 3—the 4th layer of 25×25 sieve frame; 4—the 3th layer of 40×40 sieve frame; 5—the 2rd layer of 60×60 sieve frame; 6—the first layer of 80×80 sieve frame; 7—hanger rod; 8—tie bar of sieve frame; 9~10—eccentric wheel of drive shaft; 11~12—frame member and long screw; 13—first layer stream; 14—second layer stream; 15—3rd layer stream; 16—4th layer stream; 17—bracket; 18~19—motor hook wheel; 20—motor frame
4.2 Technical requirements for square-hole sieve
4.2.1 The sieve is a punching sieve of 1630mm×700mm, and the sieve hole is square (as shown in Figure 2). The dimensions are shown in the following table.
Figure 2
Sieve grade a b c d Steel plate thickness Number of holes Remarks
mm mm mm mm mm mm Rectangular Broad
80 32.5 25 72.5 15 2.0 16 7/6 For example, 7/6: the number of broad holes is 7, arranged in 6 alternately
60 20 20 57.5 15 2.0 21 9/8
40 30 30 55.0 10 1.5 31 13/12
25 25.5 24 40.0 8 1.5 47 20/19
4.2.2 The sieve is punched with a puncher. After punching, the edge of the sieve is not allowed to be flattened with hammer. When installing, punch the burrs down and use a sand wheel to level the burrs.
4.2.3 All punching holes must be completely included in the effective area of 1630mm × 690mm.
4.2.4 If the length of any side of the sieve of each grade exceeds 2% of the nominal value, it is a waste hole. When the number of holes exceeds 10% of the total number of sieve holes, the sieve shall be replaced.
4.3 Measurement scale: the sensitivity is 0.1kg. Correct the zero point before each test.
5 Sampling
Sampling shall be carried out according to the requirements in GB/T 1997.
5.2 Where the sample is found to be so hydrated that affects the test result, it shall be properly treated before testing.
Contents of GB/T 2005-1994
1 Subject Content and Applicable Scope
2 Normative References
3 Method Summary
4 Apparatus
5 Sampling
6 Test Procedure for the Coke Content and Size Consist
7 Result Calculation
Annex A Original Record of Coke Breeze Content and Size Consist (Reference)
Additional Explanation
