鉄分を含む廃渣、酸製造の廃渣
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鉄分含有量40～50％の鉄分含有廃棄物が必要で、使用場所は貴州省銅仁市です。供給元がいれば連絡してください（QQ514607046）
今、北方では黄鉄鉱を使った酸の製造はほとんどないはずだ
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