This paper summarizes the present situation of iron and steel production and metallurgical lime production in China. Combined with the national industrial policy guidance， it analyzes the situation faced by the metallurgical lime industry development in our country，and advances some relevant development suggestions.

In this paper, calcium carbonate（CaCO3），calcium hydroxide [Ca(OH)2] and titanium dioxide（TiO2） were used as raw materials, the ratio of calcium to titanium was 1，and 3% poly PVA was added. After mixing, molding and drying, CaTiO3 samples were prepared. The samples were sintered at 1 500 ℃ , 1 550 ℃ , 1 600 ℃，1 650 ℃，1 700 ℃ respectively. XRD was used to analyze the phase composition of CaTiO3 material, and SEM was used to analyze its microstructure.

This paper introduces the refractory lining of opposed multi-burner gasifier. In order to improve the production capacity, the lining refractory of the gasifier was optimized, the effective volume of the gasifier was expanded, and the heat transfer analysis of the gasifier lining structure before and after the capacity expansion was carried out. The results show that by optimizing and adjusting the thickness of different linings, the outer wall temperature of the steel shell is basically kept unchanged, and the production expansion effect has been achieved field application step by step. However, the service life of refractories decreased significantly in the early stage after transformation. By improving the refractory performance，the improved high chrome brick has basically met the service requirements of gasifier.

The impurities in silica brick have a certain effect on it s refractoriness and refractoriness under load，a certain amount of impurities can promote the crystal transformation of quartz，which is beneficial to reduce the true density and thermal expansion coefficient of silica brick. The effects of various impurities on different properties of the product should be fully considered in the production，and the contents of impurities such as Na2O，K2O and Al2O3 should be scientifically controlled so as to improve the comprehensive properties of the product.

In order to meet the technical requirements for the production of low carbon steel and ultra-low carbon steel, brown corundum, plate-like corundum, fused magnesium aluminate spinel powder as raw materials, fused magnesia powder and alumina micro powder as additives, and almagnesia powder as binder, the machine pressed unburned corundum spinel carbon free brick was developed. The results show that the performance of the brick is the best when the content of fused magnesia powder and α-alumina powder is 3% and 8% respectively, and the service life of the brick in the molten pool and bottom of 90 ton LF Ladle is up to 105 furnaces.

A foreign steel company（hereinafter referred to as Company A）has been equipped with two 120 t converters and one LF，two 7-strand billet CCM of 165 mm × 165 mm，and one 4-strand rectangular billet CCM. Company A has a LF refining ratio of about 10% and mainly produces B500B series，HRB400 series，Q195L and SS400 products. This paper introduces the influencing factors and improvement measures of improving the automatic casting rate of the 120 t ladle in the Company A based on hands-on experience.

Adding scrap steel in refining process of ladle furnace will lead to unstable control of ladle liquid level，slagging and abnormal erosion，by taking measures such as optimizing the size of ladle egde brick press，applying L-shaped slag line brick and improving the quality of castable，the unplanned offline ratio of ladle due to abnormal erosion has been reduced by 70%， the steel-piercing accident in ladle edge is effectively controlled.

On the basis of experiments, the technology of improving the process measures of Maerz kiln was developed according to the characteristics of low-strength and easy-to-crack of local limestone in Democratic Republic of the Congo, which achieved good results and successfully calcined quicklime. Suggestions for optimization were also proposed for the existing problems. This technical solution can provide the industry peers with reference for producing quicklime and improving efficiency and quality.

The lime rotary kiln production line has the advantages of large output，uniform product quality，high activity and high utilization rate of raw materials．However，compared with shaft kiln，the production heat consumption is on the high side．Therefore，while maintaining its many advantages，further reducing the heat consumption is an important direction in optimization and improvement of rotary kiln lime technology and equipment．This article introduces the method of heat consumption of lime calcination system in rotary kiln by optimizing the calcination technology and structure of vertical preheater，rotary kiln and vertical cooler．

Based on the reality of the enterprise，expounded the significance of calcination on improving the resource utilization and cost efficiency，analyzing the calcination scheme， introduced the practice and experience of innovating the process operation and optimizing the process parameters of the rotary kiln.

This paper briefly describes the problems in the production and commissioning process of double chamber kiln，such as process calculation，frequent leakage of pulverized coal pipe， unstable kiln quality，air leakage of kiln body reversing valve，etc. analyzes the causes，and puts forward improvement measures to solve. After the improvement，the product quality has been greatly improved.

Through the production practice，technical transformation and related research and discussion of the built project，the preheating equipment and technological process of limestone raw materials with burst characteristics were developed, which made an active and effective attempt to explore the calcination of limestone raw materials with burst characteristics and improve the quality and output of finished products.

This paper introduces the innovation technology，application effect and typical cases of WDH new type of energy saving and environmental protection mechanized lime shaft kiln. The kiln has large output，stable operation of equipment，excellent lime quality and environmental emission standards are far superior to national standards.

The process of lime production has high carbon emission and causes pollution to the environment. The application of biomass energy in the lime industry，whose carbon emission is close to zero，can achieve the carbon neutral target, which is of great significance to the lowcarbon development of the lime industry

In order to improve the social and economic benefits, higher requirements are put forward for blast furnace ironmaking burdens. Therefore, the application of high magnesium alkalinity pellet and high alkali sintering ore in blast furnace has become a revolutionary progress in blast furnace burden structure. Alkalinity pellets need high quality lime and light-burned dolomite in the production process, which provides a new application market for lime industry. Based on the practice of producing alkalinity pellet solvent in TGS680 lime kiln with blast furnace gas, the quality standard of alkalinity pellet solvent and its usage are discussed.

The paper introduces the process，quality and application related to the deepprocessing of the products produced by lime kilns in the steel enterprises adopting long production process. Focusing on different demands by various processes on the products of lime kilns， such as sintering，pelletizing, hot metal desulphurization，steelmaking，refining and flue gas desulphurization，the paper points out the existing problems in the current development of lime kiln technology. In addition，it proposes that the top-level management of raw materials and fuels should be strengthened based on the new development philosophy，so as to optimize lime demand and avoid waste and improper proportioning of resources.