With development of continuous casting and secondary refining,the out-of-furnace refining treatments mainly proceed in steel ladle.The refractories for ladle lining are easy to constructed and have excellent metallurgical effects.MgO-CaO refractories can meet the above-mentioned requirements,and they are beneficial for clean steel production,but the applications for MgO-CaO refractories are limited by the hydration characteristics.The high quality MgO-CaO refractories fill the blank of ultra-high temperature researches especially above 1 900℃.

This paper introduces the development of the refractories for connecting crossover tunnel in double-D kiln and the main problems in use,and proposes improvement measures.The magnesia bricks for connecting crossover channel were replaced by high quality alumina bricks.With  these improvements,the service life of the double-D kiln increased,and refractories didn’t peel off in the last four and a half years.

There is some big differences between quicklime for glass fiber production and metallurgical lime in qualities and performance requirements.This paper introduces the requirements and control measures of composition,partical sizes,transportation and storage of quicklime for glass fiber.

This paper analyzed the status of lime production in china and stated the technology ideas and advantages of lime powder suspended calcining process.It pointed out that the heat exchange rate is high when preheating,decomposing and cooling in suspension state;calcium carbonate powder decompose with high rate and high degree; suspension calcinator with uniform and controlled temperature can improve products quality stability.This process increased high quality resource utilization rate,because lime stone with different sizes can be milled into powder as raw material.

By-products from different locations of the lime production lines were collected and analyzed.The absorbent suitable for LJS sintering fume dry desulfurization was prepared by compound method using different kinds of by-product samples.According to the characterization of TGA,BET,XRF,etc.,the compound of 90% screening by-product and 10% suspension kiln by-product was qualified to be used as  absorbent for sintering fume.The analysis results showed that absorbent prepared from the above mentioned compound contains more than 60% Ca(OH)2,the BET surface above 19m2·g-1 and D50 below 45μm,Fe2O3 is below 0.2%,Cl is below 0.007%,with little risk for the equipment corrosion and erosion.Using by-products from lime kiln for sintering fume cleaning in the same iron and steel plant is technically feasible with good economy.

This paper described the process and affecting factors of pulverized coal combustion in details and emphasized that pulverized coal combustion plays a dominant role in rotary kiln production from perspective of coal properties,pulverization process,four channel burner principle and oxygen-enriched combustion,etc.

A chemical treatment for recovery dust and gravel is proposed through experiments.In the method, the recovery dust and gravel are dissolved by acid hydrolysis, the insoluble materials are filtered, the impurities such as iron, aluminum and heavy metal are precipitated and the light calcium carbonate with high purity and high brightness is obtained by carbonization method.In addition, high purity calcium oxide and calcium hydroxide are obtained by calcination and digestion, which can be applied in high purity products required for fine chemical, environmental protection, pharmaceutical and electronic industries.