The characteristics of two energy conservation coal gas production technologies that can completely eliminate pollution and the sixth generation TGS gas calorific lime vertical kiln are systematically described,and the main technical and economic indexes of the kiln type and the market promotion and application are introduced.The newly built and put into operation of the 2×600 t/d lime kiln production line of Hunan Liangang Metallurgical Materials Technology Co.,Ltd. is the latest result of the successful application of the sixth generation TGS gas burning lime kiln technology,and is currently the first 600 t/d gas burning lime kiln using pure blast furnace gas in China.After it was put into operation,the operating conditions were good.In the short term,it has achieved the full production standard and the environmental protection has reached the ultra-low emission standard,which provides a good choice for upgrading the coal mixed lime kiln.

The solid waste produced in the production process of light calcium is processed with the comprehensive utilization technology of light calcium solid waste,and various calcium hydroxide products are made to make full use of resources.It not only create high economic benefits for the enterprise,but also greatly improve the environment of light calcium production enterprise and its surroundings,promote enterprise to meet the emission standards and achieve clean production.

The kiln structure and technical advantages of a new type mechanized intelligent environment-friendly lime kiln with mixed fule are introduced.With stable and efficient production,the output and quality of lime are raised,the production safty is improved,and the kiln production can meet the requirements of national environmental protection emission targets.

This paper analyzes a series of problems found in the overhaul process of Liugang’s Maerz kiln,such as the agglomerating in kiln wall,the burning loss of the refractory bricks at the back of the suspension cylinder and upper hopper craking above the unloading platform.The corresponding treatment is carried out,which solves the problems in production and operation of the kiln.

By testing the physical and chemincal properties of various tundish slide plates and tracking the service lifes of different slide plates in high oxygen steel,the micro structures and XRD patters of the residual zirconium oxide ring bricks in two tundish slide plates were analized.By comparing the physical and chemical properties of the test bricks with the original brick,the cause of abnormal failure of the zirconium oxide ring slide plate was studied and the damage mechanism was analyzed.

The ejector system of annular lime kiln was improved to save energy.Under the principle of high wind pressure and strong wind speed,the driving wind system was improved to achieve higher ejector pressure and better siphonic effect with the same wind column diameter.The technical improvment broke the traditional cognition that two driving fans must be started to produce at full load,and realized that a single fan could meet the full load production,thus reducing the power consumption and fuel consumption and increasing the output of quicklime.

At present,magnesia chrome bricks are the main refractories for RH furnace.Based on the field operation experience of 100 t RH furnace in a steel plant,this paper introduces the effective methods to reduce the consumption of magnesia chrome bricks in the lower slot of RH furnace,which contributes to the energy saving and consumption reduction of the enterprise.

This paper introduces the situation of the seriously damaged parts of the lining of the 900 t metal mixer,analyzes the reasons for the damage,and through optimizing the masonry,improves the iron passing amount and service life of the metal  mixer as well as the service efficiency of the ironmaking process.

The design principle of automatic control system of converter gas and coke oven gas proportionally mixing is introduced，which effectively realizes the stable control of calorific value and pressure of the mixed gas,provides the stable gas source for lime kiln.

Ten water-bonded large-area repair materials for converter were prepared with fused magnesia as main raw material,adding α-Al2O3 micro powder,titanium dioxide,bonding agent,burning aid,retarding agent and water reducing agent.The effects of the add category and addition amount on the flow value of water-bonded large-area repair material,bonding strength and medium-hot modulus of rupture were studied.The results show that 6# material has the best comprehensive performance,high strength and long service life,and can be sintered rapidly.

BOF slide gate slag stopping technology has the advantage of high success rate in slag stopping，which has been used in many large and medium BOFs in China.This paper introduces the damage reason and improved method for 120 t BOF slag stopping system.The production practice result shows that the service lives and service effects of slide gate and tap hole are both improved.