The application conditions and requirement of the refractories for firing zone of cement rotary kiln are analyzed and the applications of magnesia chrome bricks, magnesia spinel bricks, dolomite bricks and magnesia-calcium-zirconia bricks to the cement rotary kiln are discussed. The existing disadvantages and improvement measures are pointed out. It is considered that its developing direction is to use magnesia-calcium-zirconia bricks and spinel bricks and their application prospect is looked forward.

A summary is done for the problems occurring often during the bricklaying work of lime kiln.The effect of bricklaying quality on lime kiln is analyzed and prevention measures and solutions are put forward correspondingly.

The function of the mold powder for continuous casting and the structure features，working principle and technical specifications of a new type special equipment that produces the mold powder are described simply and the example of its practical data and result is given． The issue of difficult selection of the production mixing equipment for mold powder at present and the difficult issue of poor mixing result are solved． It has extensive potential applications．

Through the comparison and analysis of the components of ironmaking blast furnace slag, converter slag and cement clinker, it is known that their components are similar. The preliminary study deems that the optimization of the components of blast furnace slag and converter slag to make them to be mixed homogeneously under hot melting state, or the addition of part of mineral in them can produce the basically same components of cement clinker. This not only fully utilizes blast furnace slag, converter slag and their surplus heat, but also reduces the consumption of cement clinker resource and reaches the goal of comprehensive utilization of waste slag, energy saving, discharge reduction and low carbon.

The performance of PFL-1500 type vertical complex crusher, the actual application of the crusher in the metallurgical lime system in the calcination plant, the analysis of problems arising in the production process and corresponding prevention measures are described simply in the paper.