Method for controlling basicity of LF refining slag

The invention discloses a method for controlling the basicity of LF refining slag. The method comprises the steps of 1, making a steel ladle enter an argon blowing position for measuring the height of the slag of the steel ladle after tapping is completed; 2, adding lime and fluorite into the refining slag for slag formation after the argon blowing operation and the temperature measurement operation are completed; 3, carrying out LF refining electrifying, slag melting and deoxidizing, calculating the amount of lime needed for silicon oxidation in deoxidization alloying after electrifying is carried out for 3-5 minutes and adding the lime needed for silicon oxidation in deoxidization alloying and the fluorite into the refining slag for further slag modifying according to the calculation result; and 4, measuring whether the basicity of the refining slag meets the optimum basicity requirement of the refining slag after slag melting and deoxidizing. According to the method, the amount of the added lime is calculated through silicon balance, control over the basicity of the refining slag is accurate, the ability of the refining slag to adsorb impurities is improved, and the refining effect is improved.