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Preparation and the Life Cycle Assessment of Eco-cement Made from Phosphogypsum

Author: ZhangLe
Tutor: YangJiaKuan
School: Huazhong University of Science and Technology
Course: Environmental Engineering
Keywords: Phosphogypsum Eco-cement calcination ball mill Life Cycle Assessment
CLC: TQ172.44
Type: Master's thesis
Year: 2009
Downloads: 95
Quote: 1
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Abstract


Phosphogypsum is main byproduct of phosphate industrial. How to comprehensive utilization of phosphogypsum is always an urgent task of our country and even the world.The main content of this dissertation consists of two parts: the first is the research and development of Phosphogypsum Eco-cement (PEC) and the second is comparative study between PEC and the ordinary Portland cement with Life Cycle Assessment (LCA) method.The explorative experiment determines the ball grinding process parameters mainly from different ball mill time and different material than the ball. In this dissertation, phosphogypsum was treatmented by drying, calcining, ball mill, sieving, and other preprocessing procedure and mixed with other admixture to make of eco-cement.Optimal parameters of ball mill process were investigated. The ball mill process parameters were determined by the explorative experiment which is mainly from different ball mill time and different material than the ball. Preliminarily, the optimal ball mill experimental parameters of PEC were received. In the exploring experiment of the calcination system, the conclusion that the strength of cement blocks of 700℃calcination and calcination 2h is the highest by designing two group of comparative experiment of calcining temperature and calcining time was obtained.In the optimizing formula experiments of phosphogypsum, through different dosage of cement and lime comparative experiments, the conclusion that the best quantity of cement is 15～20% and the best quantity of lime is 1～3% can be obtained. Based on the calcining comparative test and optimize formula experiment, a group of orthogonal experiment was designed. The experimental result shows that the best level: the best calcining temperature is 700℃, the optimum quantity of lime is 1%, the optimum quantity of cement is 20%.Through the comparative research between PEC and ordinary Portland cement with LCA method, the main pollutants of two cement produce in energy and resources production and cement manufacture two phases can be found, and their main effect is the consumption of energy and resources and the greenhouse effect. The ordinary Portland cement in the production process will let off a large of CO2 mainly from the decomposition of raw materials from limestone, and the CO2 emissions of PEC, through its whole life cycle, is only 1/4 comparing with ordinary Portland cement. Through comparative study with LCA method, the conclude that comprehensive index of ecological environment load of ordinary Portland cement and PEC in their life cycle are respectively 45.969 and 15.45 can be finally received. Combined with comprehensive index, ecological environment load index of PEC is almost 1/3 comparing with ordinary Portland cement.Preparation of PEC not only has good ecological environment benefits, but also has good economic benefits. Preliminary estimating, building annual 1.5 million tons of scale of PEC, its total investment is about 23800 wan yuan. The annual profit is about 4920 wan yuan, and it is estimated that the total investment can be withdrew in 5 years.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Cement Industry > Raw materials and hybrid materials > Industrial waste residue raw material
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