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高鎂矿对鼓风爐的不利影响我們所处理的高鎂銅矿多属黄銅矿,其次为輝銅矿、斑銅矿、孔雀石,岩石均属变质盐类,如滑石、蛇紋石等。经选矿后的高鎂銅精矿与其他精矿比较:含銅一般,含硫稍低,含二氧化硅偏高,含氧化鎂特高,見表1。在銅鼓风爐熔炼高鎂矿过程中,渣中MgO超过一定范围时,爐渣粘度增加,风口发粘,送风不良,爐温下降,有死爐危險。由于渣子流动性变坏,前床凝固,使渣含銅上升,这是因为MgO在渣中形成十分难熔的二度硅酸盐MgO·SiO_2,它升高了爐渣熔化溫度,并使其发粘。MgO·SiO_2含40％MgO和60％SiO_2,在1557°C时熔化,因此MgO在渣中是不良的杂质。当Al_2O_3存在时特別有害,此时生成的鎂尖晶石具有非常高的熔点(125℃),生成的鎂尖晶石在渣中以固体状态析出,使渣变粘,并起“泡沫”。游离的MgO在
Magnesium mine adverse impact on the blast furnace We deal with the high-magnesium chalcopyrite mostly chalcopyrite, followed by chalcocite, bornite, malachite, rocks are metamorphic salts, such as talc, serpentine and so on. After the election of high-magnesium copper concentrate and other concentrates compared with: general copper, slightly lower sulfur content, with high silica, magnesium oxide, especially high, shown in Table 1. In the process of copper blast furnace smelting magnesia, slag MgO exceeds a certain range, the slag viscosity increases, the tuyere sticky, poor air supply, the temperature dropped, there is a danger of death. Due to the deteriorated slag fluidity, the solidification of the anterior bed causes the copper content in the slag to rise, because MgO forms a very refractory, second-grade silicate MgO · SiO 2 in the slag, which increases the melting temperature of the slag, stick. MgO · SiO 2 contains 40% MgO and 60% SiO 2 and melts at 1557 ° C, so MgO is a poor impurity in the slag. Particularly deleterious when Al 2 O 3 is present, the magnesium spinel formed at this point has a very high melting point (125 ° C). The resulting magnesium spinel precipitates in the slag as a solid and becomes viscous and “foamy”. Free MgO