Raw and Auxiliary Materials Purchasing Standards

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Raw and Auxiliary Materials Purchasing Standards

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Categories:Procurement requirements
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Time of issue:2022-05-16 17:11
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Raw and Auxiliary Materials Purchasing Standards

Table 1 Silica requirements
Grade	Chemical composition（%）				Granularity requirements
Grade	SiO₂	Al₂O₃	Fe₂O₃	CaO	Granularity requirements
A-silica	≥99.4	＜0.1	＜0.07	＜0.1	Less than 3% below 30mm; More than 80mm and less than 10%.
B-silica	≥99.2	＜0.2	＜0.08	＜0.1	Less than 3% below 30mm; More than 80mm and less than 10%.
C-silica	≥99	＜0.25	＜0.08	＜0.15	Less than 3% below 30mm; More than 80mm and less than 10%.
Remarks:No more than 3% of crushed stone less than 30 mm and no more than 5% of silica larger than 80 mm, without liming, debris and silt.

Table 2 Clean coal requirements
Chemical composition(%)
Grade	Ash	Volatile	Fe₂O₃	CaO	Moisture	Sintering Index
Ningxia Coal	≤6	38-45	≤0.25	≤0.3	≤8	≥90
Pellet coal	≤6.5	38-45	≤0.25	≤0.3	≤10	≥90
Shenmu coal	≤4	32-40	≤0.18	≤0.6	≤16	-
Remarks: ①Exceed the moisture content to deduct the weight. ②Among them, the characteristics of coke slag, the thickness of colloid layer, and the activity of carbon dioxide are based on the report of the supplier, and the inspection report of the authoritative organization is regularly provided.

Table 3 Petroleum coke requirements
Grade	Chemical composition(%)
Grade	Fixed carbon	Volatile	Ash	Moisture	Fe₂O₃
Taiwan coke	84-85	14-16	≤0.8	≤10	≤0.1
Remarks: ①Deduct the weight for excess moisture. ②The deviation of fixed carbon and volatile matter within 0.5% is acceptable.

Table 4 Charcoal Requirements
Grade	Chemical composition(%)							Granularity
Grade	fixed carbon	Volatile	Ash	moisture	Fe₂O₃	Al₂O₃	CaO	Less than 20mm accounted for <2% 20~200mm proportion > 95% Greater than 200mm proportion <3%
Domestic charcoal	＞65	－	≤7	≤25	＜0.1	＜0.1	＜0.1
Imported charcoal	＞65	≤25	≤7	≤25	＜0.1	＜0.1	＜0.1
Remarks: ①Deduct the weight for excess moisture. ②The deviation of fixed carbon and volatile matter within 0.5% is acceptable.

Table 5 Carbon electrode requirements
Specification	Performance parameters
Specification	Resistivity （uΩ·m）	Bulk density	Flexural strength （Mpa）	Ash	Thermal expansion coefficient/°C (100-600°C)	Maximum allowable current density
Φ900	≤30	≥1.62cm³	≥6	≤2%	≤4.0×10^-6	7.1A/cm²
Φ1146	≤35	≥1.57cm³	≥5.0	≤2%	≤4.5×10^-6	7.5A/cm²
Remarks: ①The ash content is determined by chemical analysis. ② Others are based on the supplier's report, and regularly provide the inspection report of the inspection authority.

Table 6 Wood Chip Requirements
Require	Size		Exterior
	Length	Thickness
Specification	50-100mm	30-50mm	No sediment, iron nails, iron wires, woven bags and ropes and other impurities
Remarks: ①. Visual inspection of appearance quality such as moisture content and edge skin is controlled by production, quality and procurement, and the weight will be deducted if it exceeds the standard.

Table 7 Graphite electrode requirements
Require	Diameter	Resistivity	Bulk density	Compressive strength	Ash
Specification	107mm	≤18/（uΩ·m）	≥1.56g/cm³	200-300Kg/cm³	≤1.5%
Remarks: ① Class A length: 150cm+-5cm. ②B class 180±5cm. ③C class 210±5cm. ④The acceptance method shall be determined through negotiation between the supplier and the buyer.

Table 8 Graphite powder requirements
Require	Ash	Granularity
Specification	≤65%	<180 mesh

Table 9 Requirements for Bammboo
Require	Diameter	Length
Specification	50mm-100mm	>5m
Remarks: ①The production, quality and purchasing departments are jointly controlled. ② Visual inspection.

Table 10 Requirements for chaff
Require	Package	Exterior
Specification	20kg/bag	No sediment, no iron nails, no other impurities
Remarks: ①The production, quality and purchasing departments are jointly controlled. ② Visual inspection.

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Raw and Auxiliary Materials Purchasing Standards

Raw and Auxiliary Materials Purchasing Standards