There is a Beckenbach lime kiln in Xingsteel. Its daily production capacity is 500t in which the metallurgical lime for steelmaking is about 450t and lime powder for sintering is approximate 50t. In order to verify the control index of CaO content in the metallurgical lime of the kiln, a calcination test is carried out for metallurgical lime. The test has found that the control of CaO content of metallurgical lime in the range from 88% to 89% is feasible whether it is considered from the aspect of energy saving or from the aspect of slagging.

The production line for active lime of Bozhou Western Mining Co., Ltd., Xinjiang consists of two rotary kilns with production capacity of 600t•d-1 each. The project follows the process often used and combines with the local actual conditions. The site commissioning of the project is successful and it is put into production.

The process improvement of 600t•d-1 Maerz kiln is made through summarizing the operation experiences and lessons of Maerz lime kilns with production capacities of 400t•d-1 and 500t•d-1. Remarkable results is obtained.

The effect of adding different quantities of three kinds of micropowder additives A, B and C on the microstructure and properties of RM45 is studied with help of the method of SEM, XRD and so on. The result shows that the additions of all three kinds of micropowder additives can improve the microstructure of RM45 and reduce the formation of cristobalite phase, but additive C has the best result. After additive C is added into the raw materials of RM45, the redundant part of SiO2 is consumed to form the low melting point solid solution without the cristobalite phase formation in RM45. Its property can be compared favorably with Molochite produced in Great Britain.

An introduction is given to the heating-up process and key points for 80m long tunnel kiln with small cross section of the Refractory Materials Company of Masteel. It is pointed out that preparation work should be done well in early stage and temperature and pressure should be controlled accurately to ensure the smooth progress of the heating-up process.

In this paper, present situation of existing gas fired lime shaft-kiln is analyzed, and issues needing attention are proposed and the measures should be taken when coke oven gas is used as fuel for gas fired lime shaft-kiln for calcining lime.