concentrate grade reduced
精矿品位降低
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The tests showed that an iron concentrate having a 65% iron grade could be obtained, but it had a rather high content of sulfur that should be reduced by some additional treatment.
试验表明：采用磁选柱选别可得到6 5 %以上的铁精矿。但精矿中硫含量偏高，需要进行降硫处理。
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