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Improving Sintering Performance of Specularite Concentrates by Pre-briquetting Process

机译：通过预压块工艺提高镜面精矿的烧结性能

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With advantages of high Fe grade, less harmful impurities and relatively low price, specularite is one of ideal raw materials for improving sinter grade and reducing raw material cost. However its physicochemical characteristics lead to poor granulating performance and low degree of assimilation and melt generation at high temperature, consequently affect the productivity and quality of sinter. Unfortunately the existing methods of improving sintering performance for concentrates are not applicable to specularite concentrates. In this paper, a pre-briquetting process was developed to improve the sintering performance of specularite concentrates. Experimental results of ore blends containing 24%–36% specularite concentrate showed that pre-briqutting process made specularite into larger particles alone instead of distributing in sintering layer, consequently improved the green bed permeability by 10.28%–25.91%, the vertical sintering speed and the sintering productivity by 5.40%–18.63% and 7.09%–25.81%, respectively. Furthermore, the sinter of pre-briquetting process obtained a better tumble strength which was achieved at a lower fuel rate. By pre-briquetting process, the sinter tumble strength is improved by 1.52% while the fuel consumption is decreased by 2.00 kg/t under condition that 36% specularite was contained. Meanwhile, the reducibility (RI) and low temperature reduction disintegration (RDI_(+3.15)) of sinter could be improved by pre-briquetting process especially when the ratio of specularite was more than 30%. Microscopic observation showed that more calcium ferrite phase and less magnetite appeared in the sinter of pre-briquetting than that of traditional sintering process, means the mineral composition and structure got ameliorated by pre-briquetting process.
机译：铁矿石具有高铁品位，有害杂质少，价格相对较低的优点，是提高烧结矿品位，降低原料成本的理想原料之一。然而，其理化特性导致造粒性能差，高温下的同化和熔体生成度低，因此影响了烧结矿的生产率和质量。不幸的是，现有的改善精矿烧结性能的方法不适用于苏打石精矿。本文提出了一种预压块工艺，以提高镜面精矿的烧结性能。含有24％–36％的高铁矿精矿的矿石掺合料的实验结果表明，预压块过程使高铁矿单独成为较大的颗粒，而不是分布在烧结层中，从而使生坯渗透率提高了10.28％–25.91％，垂直烧结速度和烧结生产率分别提高了5.40％–18.63％和7.09％–25.81％。此外，预压块过程的烧结物获得了更好的抗倒强度，这是在较低的燃油率下实现的。通过预压块工艺，在包含36％的镜面石的条件下，烧结矿的滚动强度提高了1.52％，而燃油消耗降低了2.00 kg / t。同时，通过预压块工艺可以改善烧结矿的还原性（RI）和低温还原崩解（RDI _（+ 3.15）），特别是当苏铁矿的比例大于30％时。显微观察表明，与传统的烧结工艺相比，预压块烧结过程中出现了更多的铁素体钙相和更少的磁铁矿，这意味着预压块过程中矿物成分和组织得到了改善。

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