The effect of SM high-efficiency water reduction agent on indexes of flow value and mechanical property of refractory castable and effect of addition of zirconite powder on residual strength after thermal shock of refractory castable are studied. The results show that in the test range, with the increase of SM addition, flow value is increased, bulk density is increased, apparent porosity is reduced, the crushing strength and modulus of rupture are raised；with increase of zircon addition, the residual modulus of rupture after 15 thermal shocks is first increased and then reduced.

In order to optimize the properties of corundum based castable，different kinds of dispersants are added into the corundum based castable bonded with pure aluminate cement． The effects of different kinds of dispersants on the electrokinetic property, rheological property and conventional physical property of the castable matrix slurry are studied systematically．The results show that all of Zeta absolute values of the matrix slurries added with four dispersants are lower, and the Zeta absolute values of the slurries added with high molecular polymer type dispersants are much lower than those of the Zeta absolute values of the slurries added with polyelectrolyte type dispersants. All of four dispersants can reduce the apparent viscosity of matrix slurry remarkably． Their optimum adding amounts are 0.2%，0.7%，0.6% and 0.7% respectively． The corundum based castable added with dispersant FS10 needs lowest amount of water and the various physical properties of the sample are better．

The effects of several kinds of silica micropowder with different pH values on the flowability and physical of magnesian castable are studied by taking magnesia as major raw material and using MgO-SiO2-H2O bonding system. The result shows that the magnesian castable by adding the silica micropowder with subacidity has good flowability and higher strength and the magnesian castable by adding the neutral silica micropowder has even better percent retention of flowability.

The development process and preparation method of intermediate phase pitch of environmental type binder and its superior property embodied in the application of refractory binder that contains carbon are described. And the present situation of the study on intermediate phase pitch both at home and abroad and its prospect application in refractory binder are analyzed.

The issues needing attention in the link of testing active lime for steelmaking are put forward．The factors influencing the accuracy of active lime testing result are analyzed specifically.

Through the tracking and analysis of the load variations of the fan for the de-dusting bag filter of Maerz PFR lime shaft kiln in the process of production the key control parameters are optimized so as to ensure the high efficient and stable operation of the de-dusting bag filter.

Lime kiln is the important equipment in iron and steel making industry, calcium carbide industry, alumina industry and refractory industry. In the paper the improvement on the central positioning mechanism of lime discharge screw cone at the bottom of the lime kiln with higher mechanization level is described and a new structural device is designed. The new device is favorable for the stable operation of lime kiln, extending the service life of gear and ensuring the use reliability.