高炉渣钾容量的试验研究

Potassium Capacity of BF Slag

为降低碱金属对高炉的危害，提高炉渣的排碱能力，采用气-渣平衡法测定了1723K时高炉渣的钾容量。依据广钢实际高炉渣成分，用纯化学试剂配制炉渣，用一定组成K（g）-CO-CO2-Ar混合气体提供一定的氧分压和钾分压。研究表明：试验条件下，w（MgO）和w（Al2O3）一定时，钾容量随w（CaO）／w（SiO2）的增大而减小；在w（CaO）／w（SiO2）和w（Al2O3）一定时，钾容量随w（MgO）的增大而增大；在w（CaO）／w（SiO2）和w（MgO）一定时，钾容量随w（Al2O3）的增大而增大；当[w（CaO）Ww（MgO）]／w（SiO2）和w（Al2O3）固定不变时，增加w（MgO），降低w（CaO），钾容量明显增大。广钢炉渣的合理成分为：w（CaO）／w（SiO2）保持在1．0，w（MgO）保持在12％～15％，w（Al2O3）不超过15％。

In order to reduce harmful effect of alkali metals on blast furnace operation, improve the alkali capacity of BF slag, the potassium capacity of BF slag was studied at 1723 K using gas-slag equilibrium technique. According to the real composition of BF slag at Guangzhou steel, the pure chemistry reagents were used to make the slags, the slags were equilibrated with a mixture gas of K（g）-CO-CO2-Ar to provide the partial pressure of oxygen and potassium. Under the experimental condition, it is shown that at fixed MgO and Al2O3 contents the potassium capacity is decreased with increasing w（CaO）/w（SiO2 ） ratio, at constant w（CaO）/w（SiO2 ） ratio and Al2O3 content the increase of MgO content results in the increase of potassium capacity, the rising Al2O3 content at fixed w（CaO）/w （SiO2） ratio and MgO content significantly increases the potassium capacity, and at constant （w （CaO）＋ w（MgO） ）/w（SiO2） ratio and Al2O3 content, the potassium capacity increases apparently with increasing MgO content and decreasing CaO content. The proper composition of slag at Guangzhou steel is： w（CaO）/w（SiO2）-1.0, MgO content in the range of 12%-15%, Al2O3 content less than 15%.