Unburnt bricks are widely used in furnace lining of active lime rotary kiln,because of their advantages of low cost and no chromium pollution.In the burning zone of active lime rotary kilns of WISCO,phosphate bonded bricks take the place of magnesite\|chrome bricks and magnesia spinel bricks,which extends the lining life to more than three years.With many years applied experiences for unburnt bricks,and based on collection and compilation and analysis on the industry data,WISCO is responsible for setting industry standards and specifications for unburnt bricks in active lime rotary kilns to guarantee the stable operation of lime rotary kiln.

This paper introduces the RH impregnated snorkel castable, which is prepared with high-purity calcium aluminate cement as binder，active α-Al2O3 micro fine as additive and fused corundum as aggregate.It also studies the effects of the ratios for different kinds of corundum and addition of spinel on thermal shock resistance and erosion resistance.

Aim at the ringing problems of lime rotary kiln with pulverized coal as fuel，this paper analyzes the  ringing causes by experiments and introduces the improvement measures,which achieving remarkable effects.

Al2O3-SiC-C castables were prepared with brown corundum as aggregate and fines (67%),SiC and pitch spheres (20% in total),active α-Al2O3 and silica fume (10% in total) as main raw materials.The effects of silica fume addition,the dispersing agents (sodium hexametaphosphate and sodium tripolyphosphate) and the types and additions of explosion-proof fibers on spalling resistance were tested respectively.The results showed that different construction thickness (weight) corresponded to different spalling resistance temperatures,the thicker the construction,the worse the permeability and the spalling resistance; in the tests,the increasing of silica fume was disadvantageous to spalling resistance,whereas the increasing of water did not have obvious influence on spalling resistance; the increasing of fibers or choosing low melting point fibers could greatly improve the spalling resistance of the castables.

Purging plugs play an important role in molten refining process.As the  refractory products, purging plugs can wear out during use,which will affect production and even cause breakout accident when they badly wear out.Based on the work environment of purging plug in refining ladle,causes of purging plug break out are analyzed and effective measures for improvement are proposed.

Rotary kiln is widely used for burning metallurgical lime and cement in China，and a mass of high temperature flue gas will be produced，resulting in heat loss.Our company applies superconducting heat transfer device in rotary kiln after thermal calculations.It has brought high economic benefits after putting into operation，responded to the government order of energy conservation and emission reduction and gotten positive social effects.

Etching of silicon nitride thin films is one of the key technologies for manufacturing microelectronic devices.The etching effect directly influences the performance of electronic components.The silicon nitride film is etched with reactive ion etching method, then the etched silicon nitride film is analyzed with atomic force microscope (AFM),optical microscope (OM) and surface profilometer characterization method.The results show that when the ratio reaction gases is NH3∶SiH4=40∶10,the thickness of the prepared silicon nitride film is uniform,so do the colors;the optimum etching time is 3 minutes,at this time the surface of the silicon nitride film is relatively smooth,and the boundary between the silicon nitride film and the Si substrate surface is distinct.