The essence of low-carbon cement industrial system is CO₂ emissions, improve energy efficiency and the development of circular economy. Development of low-carbon technology， development of circular economy is an important guarantee to realize the sustainable development of China's cement industry, is also China's cement industrial realization technology comprehensively the important opportunity of ascension. This paper introduces the current situation of the development of cement industry in China, analyzes the advantages of building low-carbon cement system, discusses the research content of low carbon technology, summarizes the current CO₂ emissions, capture and application technology development trends at home and abroad, such as cement kiln collaborative disposal of waste, improve the utilization efficiency of energy resources, the CDM, CCS, etc., At the same time put forward should attach great importance to the study of CO₂ industrial chain and capture application of CO₂.

In this paper phosphogypsum-based cementitious material （PGS） was prepared by phosphogypsum as major raw material, combining with slag for modification and adding the cement. The influence of adding special fiber on mechanical prosperities, water resistance and pore structure were investigated by measuring the impact work, flexural strength, compressive strength, porosity of PGS, as well as the microscopy of fracture surface. Results showed: (1) When fiber was 0.3%wt.%, the 28-day compressive strength, flexural strength and impact work (48.1MPa、4.8MPa and1213 J/m²)  were increased by 20.6%, 18.8% and 69.7%; water absorption, porosity and density (3.2%, 8.32% and1.60 g/cm³) were decreased by 131.3%, 176.0% and 10.0%. (2) Many C-S-H gels as caking agent packing each groups formed intense network in structure, and fiber offering a bridging function inserted hardener PGS, so both alleviated the damaging effects of external forces on the whole together.

This artical developed determination method of selenium in solid waste of cement kilns by using atomic fluorescence spectrophotometer. It's adopted reverse aqua regia and boiling water bath as digestion system,10%HCl as carrier fluid,0.4%KOH and 1.2%KBH₄ as reducing agent,K₃[Fe(CN)₆] as masking agent to eliminate interference of various ions. Also has optimized instrument conditions,and explored the detection limit,accuracy,precision and recoveries of samples.The detection limit of this method is 0.04μg/L,relative standard deviation is 3.0%~10.1% and recovries in sludge is 82.8%~102.5%.