实践表明，6号高炉采取优化参数等措施后，生铁一级品率有了明显提高。
The practice shows that the rate increases obviously after improving measures such as optimizing parameters of No. 6 BF are made.
目的是从中找出内折产生的真正原因，在生产的各个环节进行有效控制，以减少内折，提高产品的一级品率。
The aim is to find the real reason making folds and effectively control the links in the producing in order to reduce the folds and improve the quality of finished product.
中试工业化实验中草酸的提取率达90%以上，所得到的草酸的质量达到GB1626—88标准的一级品要求。
The yield of oxalic acid is over 90% in pilot tests and the product quality meets GB-1626-88 standard for the first-grade product.
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