This paper introduces the technical development status of mechanized lime shaft kiln with mixed fuel in 2017 and proposes improving measures for the key technical problems,and proposes reflection and prospect for technical development and investment.

With the increasing diversification market demand, many kinds of products should be produced to meet the demand,and this is a focus of enterprise competition in the future.Our company takes the advantage of technology of the rotary kiln and manages seriously to obtain stable and high yield in multi-variety production process.

Based on current situation of beam lime kiln,this paper introduces the kiln structure configuration and roasting process,and analyzes the advantages and disadvantages of the beam kiln,which has significance for the customers with the requirements of low investment,small land occupation and undemanding lime quality.

For the reason of optimizing steel production capacity in China,as a lime production base for Xuan steel company,our company will produce higher quality lime for expanding export market. In this paper,burning experiments for producing calcium carbide with industrial form coke are carried out in new mechanized shaft kilns,and point out that using industrial form coke to produce higher quality lime.

In this paper，the effect of heat-resistant steel fiber (1%,1.5%,2%,2.5%,3%,3.5% respectively) on the properties of high purity corundum castable refractories were studied.The results show  that when the heat-resistant steel fiber content is 2.5%，after low，medium and high temperature treatment，the high purity corundum castable refractories had higher volume density，suitable linear change,higher flexural strength and compressive strength.After 5 cycles of thermal shock by water cooling at 1 100℃，the  residual crushing  strength and residual compressive strength is still  higher，with satisfactory thermal shock resistance is better.

This paper described the application of magnesia-carbon brick MT-14A in 65T GOR converter bottom and analyzed the sample bricks at the bottom of shorter service life.The results showed that the longest furnace life using 1 000mm-long magnesia-carbon brick MT-14A is 62 times and the average life is 50 times, and that using 800mm-long magnesia-carbon brick MT-14A is 41 times and the average life is less than 30 times.It’s also found that the magnesia-carbon brick MT-14A got fractured in service and proved not a suitable material to be employed in GOR converter bottom since the damage mechanism of MT-14A is melting loss of fused-magnesite and decar-bonization in working surface.

Low aluminum mullite brick was prepared with low aluminum mullite and high-voltage insulator waste as raw materials,quartz powder as additive and pulp waste liquid as binder.The above-mentioned materials were mixed in proper particle size distribution,formed under high pressure,dried and fired at 1 400℃.In the paper,the performances of this new type bricks were compared with normal silica mullite bricks and the effects of the high-voltage insulators waste addition amount on the properties of sintered samples were investigated.The results showed that low aluminum mullite brick has excellent alkali resistant and low thermal conductivity,which is appropriate for the preheating and calcining zone of cement rotary kiln.Meanwhile,the production of the bricks has practical significance for rational utilization of resource as recycling high-voltage insulator waste as raw material.