Abstract: The slag power,plaster,clinker are mixed together with different proportion so as to do the experiment on the strength of paste block net pulp.The grade of slag cement strength is divided in line with the net pulp strength grade to conduct the experiment on the strength of blending the paste backfilling.The above experiment results proved that,the development of lead slag cement is feasible.However, due to the cementing activity of lead slag is weak,so,it is ideal that,part of the portland cement can be replaced with lead slag in the process of mine filling to improve the cementing activity of the mixed gelling materials,reduce the cost of mine filling and meet the requirement of mine filling strength.

Key words: Lead smelting slag, Lead slag cement, Paste filling, Compressive strength