To reduce the binary basicity you need to increase de SiO2 content in slag. If the hot metal Si content is not enough you can use a flux with SiO2 or add some product with Si content in the converter charge. Of course, the basicity reduction will decrease the P capacity of the slag!
Basically the basicity is the ratio of CaO/SiO2. Then, you can either reduce CaO or increase SiO2, depending on your convenience. Remember that low basicity is also not good if you want to remove S.
That may help: https://www.bruker.com/fileadmin/user_upload/8-PDF-Docs/X-rayDiffraction_ElementalAnalysis/XRF/Webinars/Webinar_200809_-_Slag_Analysis_by_XRF_Spectrometry.pdf
It depends on the process and the aim of this basicity reduction. It also depends on what you use as basicity. Be careful a lower basicity means that you will lower the activity of your slag (P,S removal) as said by the previous answers. Ans be careful, reducing the basicity of your slag may also increase your refractory consumption.
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