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
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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
中華人民共和國國家標準
冶金焦炭的焦末含量及篩分組成的測定方法
Coke for metallurgy—Determination of coke breeze content and size consist
GB/T 2005—94
代替GR 2005—80
1 主題內容及適用范圍
本標準規定了測定粒度大于25mm冶金焦炭的焦末含量及篩分組成的方法提要、設備、試驗操作步驟、結果計算等。
本標準適用于粒度大于40mm的大塊焦，大于25mm的大中塊焦和25～40mm的中塊焦的焦末含量及冶金焦炭篩分組成的測定。
2引用標準
GB 1997焦炭試樣的采取和制備
3方法提要
將冶金焦炭試樣用機械篩進行篩分，計算出各粒級的質量占試樣總質量的百分數，即為篩分組成。小于25mm的焦炭質量占試樣總質量的百分數，即為焦末含量。
4設備
4.1方孔機械篩
方孔機械篩的性能及主要規格：
外型尺寸：長2100mm×寬1340mm×高1310mm(如圖1)；
篩子層數：4層；
篩子總重：約500kg；
篩子傾角：11.5°；
篩子的振幅：3～6mm；
電機：2.2kW，450r/min；
速比：1：1。
圖1五級振動篩示意圖
1—底座；2—第五層篩底；3—25×25篩片篩框第四層；4—40×40篩片篩框第三層；5—60×60篩片篩框第二層；6—80×80篩片篩框第一層；7—吊桿；8—篩框拉筋；9～10—傳動軸偏心輪；11～12—框件和長螺絲；13第一層流子；14—第二層流子；15—第三層流子；16—第四層流子；17—支架；18～19—電機勾輪；20—電機架
4.2方孔篩片的技術要求
4.2.1 篩片為1630mm×700mm的沖孔篩，篩孔為正方形(如圖2)，尺寸見下表。
圖2
篩子級別 a b c d 鋼板厚度 孔數 備 注
mm mm mm mm mm mm 長方 寬方
80 32.5 25 72.5 15 2.0 16 7/6 如7/6即：寬方的孔數為7個與6個相間排列
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篩片用沖床沖孔，沖孔后不允許用錘子打平其邊緣。安裝時將沖孔毛刺朝下，用沙輪將毛刺打平。
4.2.3所有沖孔必須完整的包括在1630mm×690mm有效面積內。
4.2.4各級篩片的篩孔任一邊長超過標稱值2％，即為廢孔，其孔數超過篩孔總數的10％時，需更換篩片。
4.3計量稱：感量0.1kg。每次使用前要校正零點。
5試樣的采取
5.1試樣的采取按GB 1997的規定進行。
5.2當發現試樣水分過大，對試驗結果有影響時，應作適當處理，方可進行試驗。
6焦末含量和篩分組成的試驗步驟
6.1將采取的試樣連續緩慢均勻地加入機械篩進行篩分，并保持試樣在篩面上不出現重疊現象，將試樣分成大于80mm、80mm～60mm、60mm～40mm、40mm～25mm及小于25mm的五個粒級焦炭。
6.2篩分試樣全部篩完后，分別稱量各粒級焦炭的質量(稱準至0.1kg)，并計算各粒級焦炭質量占總量的百分數。其中小于25mm焦炭質量占總量的百分數，即為焦末含量。
6.3按附錄規定的內容進行記錄。
7結果的計算
各粒級百分數(Si)％按下式計算：
式中：Si——各粒級篩分百分數，％；
mi——各粒級試樣質量，kg；
m——試樣總質量，kg；
i——各粒級范圍值(如：25～40，40～60等)。
附錄A
焦末含量及篩分組成原始記錄
(參考件) 日期 班別 試驗人 審核人 批號
篩 級 >80mm 80～60mm 60～40mm 40～25mm <25mm 焦末含量 總質量kg 取樣地點
質量，kg
％
附加說明：
本標準由中華人民共和國冶金工業部提出。
本標準自實施之日起試行1年。
本標準水平等級GB/T 2005—94 I
