鉛・亜鉛精鉱の品質基準はどのようなものですか？

2026年4月13日

the quality standards for lead-zinc concentrate

Lead concentrate is classified into four grades based on its chemical composition: Grade 1, Grade 2, Grade 3, and Grade 4. The chemical composition of lead concentrate should meet the following requirements. The provisions of Table 5-4 apply.

		Table 5-4 Lead concentrate chemistry 要素単位：%
Taste class	Chemical composition (mass fraction)
	Pb≥	Impurity content ≤
	Pb≥	Cu	Zn	As MgO Al ₂ O ₃
Grade A	65	1.2	4.0	0.3	1.0	2.0
Grade II	60	1.5	5.0	0.4	1.5	2.5
Grade III	55	2.0	6.0	0.5	1.5	3.0
Grade IV	45	2.5	7.0	0.7	2.0	4.0

Zinc concentrate is classified into four grades based on its chemical composition: Grade 1, Grade 2, Grade 3, and Grade 4. The chemical composition of zinc concentrate should meet the following requirements. The provisions of Table 5-5 shall apply.

Table 5-5 Chemistry of Zinc Concentrate 要素

単位：%

Taste class	Chemical composition (mass fraction)
	Zn≥	Impurity content ≤
	Zn≥	Cu	Pb	Fe As SiO₂
Grade A	55	0.8	1.0	6	0.2	4.0
Grade II	50	1.0	1.5	8	0.4	5.0
Grade III	45	1.0	2.0	12	0.5	5.5
Grade IV	40	1.5	2.5	14	0.5	6.0

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