A certain plant located at an altitude of more than 2 200m had been put into operation for many years, the energy consumption and emissions could not meet the increasingly stringent national standard. After diagnosis on site, the energy-saving transformations were implemented including the preheater, calciner, exhaust gas treating system, kiln and tertiary air duct, cooler, etc. The upgrade project was completed and accepted in July, 2018. After the transformation, the clinker heat consumption was reduced by 438.9kJ/kg.cl, and the power consumption of the clinker was reduced by 6.1kW·h/t.cl. Since it was put into production for more than one year, the system has been operating stably and has reached the expected technical transformation target.

The physical and chemical properties of industrial waste slag used for preparing iron and steel slag powder in T Company were analyzed. In view of the problems existing in the closed-circuit grinding system of G95 steel slag powder pilot production stage, the effective length of each bin of tube mill and the parameters of screen separation bin plate were adjusted, and the grinding body grading of the second and third bins were optimized. After the technical improvement, the grinding capacity of the system is significantly improved. The specific surface area of steel slag powder is increased from 168m2 / kg to 296m2 / kg, and the system output is increased from 35.6t/h to 44.4t/h. The output of iron and steel slag powder can be increased by about 210t each day. Calculated based on the cost of steel slag powder is 100 CNY / t, the economic benefit can be increased by 630,000 CNY per month.

Using fly ash and desulfurization ash as the main raw materials, the fly ash -desulfurization ash unburned planting ceramsite is prepared by steam curing process. The effects of steam curing time, steam curing temperature, n(SiO₂)/n(Na₂O), desulfurization ash content and foaming agent content on the performance of the as prepared planting ceramsite were investigated. The phase composition, microscopic morphology and micro-domain composition of ceramsite were characterized by XRD, SEM and EDS. The results show that: when the steam curing time is 8h, the steam curing temperature is 80℃, n(SiO₂)/n(Na₂O)=5.0, the desulfurization ash content is 5%, and the foaming agent content is 0.75%, the planting ceramsite can be prepared with cylinder compressive strength of 3.56 MPa, while still maintaining the water absorption rate of 19.95% and the bulk density of 931kg/m³. The planting ceramsite prepared achieves a smooth surface, beautiful appearance, developed internal pore structure, strong water absorption capacity, and is rich in elements such as Si, Ca and S, which are suitable for plant growth.