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测定了合成的不同成份的FeO－CaO－MgO系炉渣的粘度，得知：在炉渣中，当mFe／mso2为1.2～1.5，ωMgO为6％～9％，ωFe3O4为3％～4％，ωCaO为0～9％，温度范围为1250～1450℃时，炉渣粘度随ωFe／ωSiO2和ωCaO的升高而降低，随着ωMgO的升高而增大；在1350℃以上时，上述变化关系则不明显．对于闪速炼镍所采用的FeO－SiO2－CaO－MgO系炉渣，在一般的冶炼操作温度（1300～1350℃）下，当渣中ωMgO高达6％～8％时，仍可获得流动性能良好的渣；当ωMgO在9％以上时，则渣的粘度迅速上升以致不适合于冶炼．同时，在炉渣总量不变的情况下，在一定的范围内通过减少SiO2的加入量和补加CaO含量可使炉渣粘度得到改善．
The viscosity of FeO-CaO-MgO based slags with different compositions were measured. The results showed that when the content of mFe / mso2 is 1.2 ~ 1.5, the content of ωMgO is 6% ~ 9%, the content of ωFe3O4 is 3% ~ 4% Is 0 ~ 9%, the viscosity of slag decreases with the increase of ωFe / ωSiO 2 and ωCaO at the temperature range of 1250 ~ 1450 ℃, and increases with the increase of ωMgO; when the temperature is above 1350 ℃, the relationship between the above changes is not obvious. For the smelting of FeO-SiO2-CaO-MgO slag for flash nickel refining, good flowability can still be obtained when the ωMgO content in the slag is as high as 6% to 8% at typical smelting operating temperatures (1300-1350 ° C) Of the slag; when the ωMgO is above 9%, the viscosity of the slag rises rapidly so that it is not suitable for smelting. At the same time, with the same total amount of slag, the slag viscosity can be improved within a certain range by reducing the amount of SiO2 and adding CaO.