The factors that affect the service life of the ladle bottom are found by analyzing the working environment of 150t ladle of Tianjin pipe corporation，and some technical improvements are made.The service life of ladle bottom impact area are improved from choice the materials of magnesite\|alumina spinel carbon bricks,improve the laying methods of the ladle bottom impact area,strengthen the maintenance of ladle and change the size of the brick etc.,the safety of ladle and lower consumption are gained.

This paper briefly introduces the status and composition of Al2O3-SiC-C based castables and analyzes the chief factors on iron runner lining damage with the material of Al2O3-SiC-C based castables,and systematically summarizes the improvements and research developments of the performances of Al2O3-SiC-C based castables.

In this paper, four different commercially available sources of α-Al2O3 powder which were marked as domestic A,domestic B,import A,import B,were added into low cement castables quality bauxite.The experimental results showed that,Al2O3 powder of import A has bimodal distribution and fine particles,so it fills better and helps the system sintered well;the sample containing import A powder has the best performance;the sample containing domestic B powder has wider distribution of particle size and larger particles,so it has the worst performance;the sample containing domestic A powder has narrow distribution of particle size,and its performance index is second only to importing A powder.

Building the heat transmission model of single gunning particle by the analysis of heat transmission of mullite ceramic welding,calculating the melting time of different gunning particle by means of stable heat transmission formula.It is an important theoretical basis of the particle proportioning and operating instruction for mullite ceramic welding.

Compared with the consumption indexes of No.1 to No.3 Mearz kilns,this paper analyzes the reasons of high LDG consumption of No.4 and No.5 kilns and takes corresponding measures to reduce the gas consumption by optimizing technical operation and improving equipment.

Metallurgical materials technology company of lianyuan steel have four Maerz kilns (400t·d-1,450t·d-1,and two 600t·d-1 kilns).Refractory bricks caused by non\|standard connection channel refractory drop seriously in kiln No.2 and kiln No.3,there are even burn through the phenomenon of kiln shell.Through the early stage of the relatively simple in the original upper arch add castable solutions to drop the lighter brick of kiln No.3,but the kiln No.3 burned through phenomenon again two months later,so you need to find a complete repair of rapid repair.

To meet the national emission standards for environmental protection, a technical design for de\|duster installation in mechanical lime shaft kiln provides de-dusting technical parameters after comparing two kinds of filter materials and proposes higher requirements for structural design and electric control of the kiln.

Steelmaking production has certain requirements for limestone particle size, and some correlative experiments need to be done to choose the appropriate limestone mines for raw materials.At present, there is no valid experiment method for the measurement of lime pulverization rate.Based on the analysis of pulverization mechanism of lime in rotary kiln, a simulation method for the measurement of lime rotary kiln pulverization rate in laboratory is determined.This method does not need to prepare a lot of experimental raw materials and just need simple equipment, and the experimental data is close to actual production data, which is worth popularization and application.

This paper studies on the relationship between ladle filler sand and the ladle self-starting pouring.Deeply analyzes from quality,property,adding status of ladle filler sand,and operating status of ladle.The analysis result shows the ratio of ladle self-starting pouring relates to the quality,particle shape & size,thermal conductivity,coefficient of thermal expansion,molten steel penetration resistance of ladle filler sand, status and operation cycling time of ladle,stirred mode of molten steel.We need to choose different type of ladle filler sand based on different ladle application environment.