This paper analyzes the development of lime rotary kiln in 2014, defines the main assessment indexes for the technologies of large lime rotary kiln and proposes new technologies and main problems of the lime rotary kiln in 2014. Finally, the paper prospects the technical development of lime rotary kiln for 2015.

This paper introduces the status of shaft lime kiln with mixing fuel, chiefly analyses the direction of technology innovation and ascertains that innovation on increasing ore utilization ratio, saving energy and optimizing operation will be the direction of technology innovation for low\|cost production, and further proposes the basic thought on how to increase production efficiency and lower costs for shaft lime kiln with mixing fuel.

This paper studies the blast heater refractory erosion caused by HCl in blast furnace gas. It is found that in clay bricks, HCl gas can promote the transformation from silicate glass phase and recessive aluminum silicate into mullite and cristobalite and in silica bricks, HCl gas also can promote the transformation from cristobalite into tridymite,however obviously decreases the degree of crystallinity of the particles and leads to cracks because of the irregular expansion of the particles.

Rim usually appears in production of calcined lime in coal type rotary kiln of active lime, temperature change and rim falling\|off in the process of rim treatment can damage the refractory, which require high strength and thermal shock resistance.The selection of refractory relates to the proper running of rotary kiln.

Adding Cr2O3 (0,1%,2% and 4%,in mass) to the experimental basic formulation of steel-tapping hole filling refractory, the effects of different Cr2O3 contents were discussed.The results show that the corrosion resistance increased obviously when Cr2O3 was added, and the bulk density and strength reduced a little.When Cr2O3 addition is 2％, the best comprehensive property was obtained.

Refractory construction process is the forming process of RH furnace project entity and the important stage of the formation of final refining furnace. So, the quality control of RH furnace construction stage is the key point of the quality control in the whole project. This paper mainly analyzes the quality control in construction stage of RH furnace and proposes some opinions on strengthening quality control of the construction stage.

This paper discussed the status of limestone, fuel and demands for lime products of Chongqing Steel Group and studied the lime production technology at home and abroad.By establishing the three layers fuzzy comprehensive evaluation system for the active lime system and based on analysis of experts and managers,technology selection of active lime project was finally determined.

Experiments have been done to produce light weight silica bricks by adding arthracite duff，composite ignition loss agent XW and coke fines respectively as ignition loss agent into waste silica brick chamotto.On  comparative analysis of the experimental results，an optimal ignition loss agent is chosen，which can obviously reduce the lacking edges and improve the appearance of the fired brick.

This paper analyzes the failure mechanism of the lining of lime shaft kiln with coke as fuel and selects proper bricks as kiln lining. It is found that the lining life can be prolonged by reasonable masonry methods which can meet the normal demand of steel-making and also improve the economic benefits.