Under the background of carbon peaking and carbon neutrality, this paper introduces the policy and application status of electric fusion technology, analyzes the three functions of the electric fusion technology in the production and application of refractory, and puts forward some suggestions on the application of the electric fusion technology in the refractory industry and its wide application prospect.

Adopting A85 homogenized bauxite，96 sintered magnesia，corundum powder， alumina magnesium spinel powder，silicon powder，alumina powder，carbon and silicon-based additives as raw materials，the effects of carbon materials and silicon-based additives on the properties of castables were studied through experiments. The silicon-based additives can enhance and inhibit the oxidation of carbon materials，with the introduction amounts of 0，0.5%，1%，1.5% and 2% respectively. The results show that with the introduction of silicon-based additives，the porosity first decreases and then increases，the bulk density first increases and then decreases， the black core area gradually increases，and the high temperature performance first improves and then decreases. Comprehensive analysis shows that when the amount of silicon-based additives is 1%，the performance of castable is the best

In view of the requirements of local emission standards，from the reality of gas tunnel kiln flue gas emissions，low-temperature SCR method is adopted to treat flue gas. Through the comparison before and after the transformation，SCR facilities have good denitration effect and stable operation，reaching the requirement of ultra-low flue gas emissions，which has certain popularization significance in tunnel kiln flue gas environmental protection treatment

Gas pressure sintering technology can be used for the preparation of highly densified ceramic materials with complex shapes，which is an economical，practical and important sintering technology. In this paper，the gas pressure sintering technology and related equipment are introduced，and the related research progress on the preparation of ceramic materials by gas pressure sintering technology are summarized. Meanwhile，the development direction for preparing ceramic materials by gas pressure sintering technology is prospected

In order to study the effects of sliding plate grinding powder on the properties of magnesia-alumina castable，95% magnesia，88% alumina and silica fume were used as main raw materials to prepare magnesia-alumina castable. The effects of 2%，4% and 6% of sliding plate grinding powder on bulk density，apparent porosity，modulus of rupture at room temperature， slag penetration resistance and slag erosion resistance of magnesia-alumina castable were studied. According to the comprehensive analysis，when the addition amount of sliding plate grinding powder is 2%，the application effect is the best.

Through analyzing the composition of refractories in tundish and the damage problems of refractories in daily work, this paper analyzes the design, use and management of refractories one by one, finds out the causes and puts forward solutions to ensure the safe use of refractories

The organized and in-depth treatment of flue gas pollutants carried out by refractory enterprises helps to reduce the emissions of particulate matter, SO2 and NOx in the atmosphere. This paper discusses and analyzes the common problems in the treatment of flue gas pollutants in hundreds of refractory enterprises in Zhengzhou, and puts forward improvement measures based on the problems, in order to provide reference for energy conservation and pollution reduction of refractory enterprises.

Magnesia refractories have excellent characteristics of high refractoriness and high temperature strength，and are widely used in metallurgy，chemical industry and other fields. By analyzing the current situation of the standard system of magnesia refractories industry，this paper finds out the significance of further improving the construction of the standardization system of magnesia refractories，and puts forward some suggestions to promote the high-quality development of the industry with the construction of the standardization system.

Combined with the burning down of supporting arch of double-bore kiln, the steel frame supporting mould was used for repairing. Compared with the removal and relaying of double-bore kiln, the repair time is greatly shortened and the repair cost is saved about 5.6 million yuan. The supporting arch has been put into operation for more than one year after restoration, but it has not been found that the refractory in the kiln has fallen off, the pressure in the kiln and the energy consumption of the product have been reduced obviously.

Under the condition of low calorific value converter gas as fuel, the limestone suitable for low calorific value calcination process is selected after high coke mixed gas replaced by converter gas in the double D lime kiln of Nangang. In view of the adverse effects of low calorific value gas, a series of equipment and process improvements are carried out, which effectively overcome the disadvantages of low calorific value gas, stabilize kiln production and increase the production capacity of double D lime kiln.

A compound filter bag dust collector equipment which integrates dust removal and lowtemperature denitration is introduced. The filter bag is treated by PP treatment agent and then coated with nanometer catalyst on the surface of the filter bag to form a compound filter bag. The purpose of dust removal and denitration is realized by a bag dust collector，and the process of flue gas short-range dust removal and denitration is realized

During the production of magnesium calcium bricks，due to lax quality control of raw materials，there may be defects such as air voids left on the surfaces of calcined bricks， causing great products losses and resource waste. In this paper, by means of conducting microscopic detections such as component analysis, XRD phase analysis，and SEM scanning electron microscopy to the air voids in the magnesium calcium bricks，it is found that the excessive content of SiO2 and Al2O3 impurities in the magnesium calcium sand causes the conversion of C2S（dicalcium silicate）and C3S （tricalcium silicate）and the formation of manganolite with low melting point and low melting mineral phase with high aluminum at the enrichment of silicon and aluminum.

Active lime is one of the important solvents and slag-forming materials in iron and steel production. Basically，all major and medium-sized iron and steel enterprises in our country have production facilities for metallurgical lime. In the production process of active lime, the transportation of materials is often accompanied by dust. If the dust is not treated， it will cause dust overflow，which will not only pollute the surrounding environment，but also endanger the health of workers and surrounding residents. In addition，the national requirements for environmental protection are getting higher and higher，the environmental dust removal is particularly important. This paper analyzes the causes and locations of fugitive dust，and introduces the dust treatment methods and the calculation of dust collection air volume under different dust source environments.