This paper reviewed the constructions of lime rotary kilns and technical progresses and features in 2013，and emphatically introduced the roasting system of 1 000t·d-1 rotary kiln.The major problems of the rotary kiln and corresponding solutions were also pointed out.The rotary kiln has good prospects for its mature technologies，good quality products and adaptable fuels.

The original design of three channels coal burner into Sinoswirl type dual-cyclone coal burner on the production line of active lime kiln is modified.The result shows that the dual\|cyclone coal burner has advantages of higher productivity and lower energy comsuption to a large extent with remarkable economic benefits.

Aiming to solve the problems of short service life of lining bricks and over heating of furnace shell due to poor insulation of lining bricks，we studied the refractory lining of the rotary kiln.Based on damage investigation and compounding tests，we developed a kind of composite percast brick with refractory working surface and monolith insulation，by which service life can be extended by over two years and surface temperature of the furnace shell can be reduced by more than 50℃.

This paper studies a silica brick sample removed from the heating wall in coking chamber of a 40\|year\|old coke oven during hot repair.The result shows that the silica brick still remians dense and uniform for over forty years，with no strength degrade.In application of the silica brick，the carbon in coal can penetrate into the pores of the silica brick and make it “silica carbon brick”,containing about 5% canbon，which benefits to improve the performance of silica brick and increase the heat transfer efficiency of coking.Unavoidably，the carbonization face is corroded by ash in the coal.However，the low corrosion rate and poor penetrability of this brick can not damage the silica brick.

This article introduces a synergistic practice，including improvement maintenance,equipment technical modification,products structure adjustment and system building for equipment periodical repair to modify the eight shaft kilns on half\|off production.The result shows that obvious effects have been obtained，such as better kiln conditions and thermal insulation，higher productivity and lower fuel consumption and manufacturing cost as well.At present，a stable profitability has been achieved.

This paper analyzes the main problems in production of No.1 and No.2 Maerz lime kilns of Liusteel and describes the design optimization of No.3 lime Maerz kiln.The optimized kiln can increase productivity and produce metallurgical lime of superior quality.

This paper studies the aluminium carbide，a recognized harmful substance formed in  preparation  of magnesia carbon bricks or regenerated magnesia carbon bricks.The formation mechanism of aluminium carbide is determined within the range of  thermal treated temperatures.The paper also studies the effects of thermal treated temperatures and graphite additions on the formation of aluminium carbide（Al4C3）.