Based on the basis of double beam lime kiln which was burned with double fuels of coal powder for lime calcined and exhaust of calcium carbide furnace,semi-coke powder was recycled  in drying process of carbon material.Replacing coal powder with semi-coke powder in lime calcination not only can fully recycle the exhaust of calcium carbide and semi-coke powder,but also can reduce the production cost and make a great deal of economic benefit and social benefit.

In view of the actual operation of the Maerz gas-fired kiln in production,this paper analyzes the causes of high unit energy consumption of the Maerz kiln,such as channel blockage,uneven distribution of particle size,improper heat radiation of kiln shell,improper heating system and material segregation etc..The  paper also describes the measures which should be taken to effectively reduce the unit energy consumption.

X-ray fluorescence spectrum analysis was used to determine the refractories with high CaO content such as limestone and blue stone etc..Samples were made into molten glass sheets by automatic molten prototype with anhydrous Li2B4O7 as solvent, platinum crucible as mold, ammonium bromide as release agent. Standard measurement procedures were set up by using standard samples and the measurement results could be obtained quickly, which were more quickly and accurately than traditional measuring method.

An optimum addition amount of the burning agent for welding repair material is obtained by heat balance calculation during the welding repair process for mullite-based ceramicwelding repair material.The scientific calculation provides an important theoretical basis for formulation development of welding repair material.

Beam kiln stove was operated manually for drying pulverized coal and burned lump coal as fuel which increased labor costs and stove temperature fluctuations，thus seriously affected the quality of pulverized coal. Automation reconstruction on the stove not only reduced production costs but also improved the quality of pulverized coal drying.

Dispersive purging plugs without purging by oxygen were prepared with corundum and spinel as the main raw materials, alumina and silica fume as additives, adopting a certain particle size distribution and moulding by casting. Physical properties such as bulk density and compressive strength were determined, and the using effects were tested on a ladle of 180 tons. The results show that the bulk density is greater than or equal to 2.8g·cm-3, the compressive strength is greater than or equal to 65MPa and the apparent porosity is less than or equal to 26%; the blowing-though rate is higher than slit purging plugs, and the service life increases by 30% or higher; the consumptions of oxygen blowpipe and oxygen as well as nitrogen are reduced by 90%; the residual plugs are longer; the operation is safe and the economic benefit is remarkable.