Stability of Tricalcium Silicate and Other Primary Phases in Portland Cement Clinker

Transcription

1 Supporting materials of the manuscript submitted to Industrial & Engineering Chemistry Research Stability of Tricalcium Silicate and Other Primary Phases in Portland Cement Clinker Xuerun Li, Xiaodong Shen*, Mingliang Tang,Xiaodong Li State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, , China AUTHOR INFORMATION * Corresponding author: Tel: ; Fax: ; xdshen@njtech.edu.cn Contents 1. Polymorphs of the C 2 S 2. Avrami fitting of the kinetic data 3. Testing of another clinker on the decomposition temperature 4. Raw data of the manuscript 5. Processing of the kinetic data S1

2 1. Polymorphs of the C 2 S Figure. S1 and Figure. S2 give three plot of the PDFs of the C 2 S polymorphs, i.e. beta-c 2 S, gamma-c 2 S and alpha-c 2 S. Only the beta-c 2 S (Larnite) yields the best fit. Beta C 2 S f-cao Gamma C 2 S Figure. S1 Comparison of the gamma-c 2 S and the beta-c 2 S in our sample. Beta C 2 S f-cao Alpha C 2 S Figure. S2 Comparison of the alpha-c 2 S and the beta-c 2 S in our sample. 2. Avrami fitting of the kinetic data S2

3 Figure. S3 Avrami fitting of the decomposition of alite, herein, t is the reaction time (s) 3.Testing of another clinker on the decomposition temperature Taking the complicity of the industrial clinker, two different clinkers (clinker A and clinker B) were employed to find out the fastest decomposition temperature of C 3 S in clinker. Clinker B was just used to give a more universal temperature range of C 3 S. Most of the mechanism and kinetic research were done based on clinker A. Clinkers from cement plants (A : China United Cement Corporation, Xuzhou, Jiangsu Province, China; B: China United Cement Corporation, Nanjing, China) were used in our experiments. Table S1 Chemical composition of the clinker (%). Compositions a LOI b SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO SO 3 K 2 O c Na 2 O c Clinker A Clinker B a Compositions were determined per the methods specified in Chinese standard (GB/T ). b Loss on ignition at 950 C. c K 2 O and Na 2 O content was measured by the flame atomic absorption spectrometry (FAAS). Table S2 Mineral composition of the blank clinker (%) Clinker Method C 3 S C 2 S C 3 A C 4 AF f-cao f-mgo A Bogue N/A N/A A XRD B Bogue N/A N/A B XRD S3

4 The decomposition temperature is determined by the same method on clinker B (contour plot of C 3 S content is given in Figure S4), the resulted decomposition temperature is ~1150 C which is in agreement with the obtained temperature range for the decomposition of C 3 S (~ C). Taking the chemical composition into consideration, both the clinker A and clinker B have similar composition. This is because the alkali contents and the sulfur consents are of the same level, which are considered as the factors governing the decomposition of C 3 S. When considering the decomposition temperature of C 3 S in clinker, both the sulfur and alkali content should be taken into consideration which could bring some shift of the decomposition temperature of C 3 S. Figure S4. Contour plot of the C 3 S content (%) of clinker B with time and temperature. S4

5 4. Raw data of the manuscript Table S3 f-cao content (%) determined using the XRD RIR method and using the chemical method Temp. a ( C) Time (h) XRD Chem. b XRD Chem. XRD Chem. XRD Chem. XRD Chem. XRD Chem a Temperature. b Chemical method. S5

6 Table S4 Mineral composition of clinker annealing at 915 o C obtained by XRD Table S5 Mineral composition of clinker annealing at 965 o C obtained by XRD Table S6 Mineral composition of clinker annealing at 997 o C obtained by XRD Table S7 Mineral composition of clinker annealing at 1095 o C obtained by XRD S6

7 Table S8 Mineral composition of clinker annealing at 1114 o C obtained by XRD Table S9 Mineral composition of clinker annealing at 1159 o C obtained by XRD Table S10 Mineral composition of clinker annealing at 1200 o C obtained by XRD S7

8 5. Processing of the kinetic data The treated parameter of the kinetic data was shown in k is the slop of the Jander model, which is also the rate constant of the reaction; K is the slope of the plot of ln k v.s. 1/T, the slope is obtained by the numerical differentiate method; the relation between the K v.s. Ea is defined by the Arrhenius equitation: Ea = -R K (Eq. (6) in the manuscript), herein K is the slope of to the temperature (T), as shown in Figure S5, so the Ea is also linear to the temperature. Table S11 Parameter of the kinetic data. T T 1/T k ln k K Ea K K -1 K mol kj mol E E E E E E E E E E E E E E E E E E E E E E E E Notes: (a) taken the positive value of the activation energy, all the K were treated to be minus. Figure S5 Numerical differentiation of the Arrhenius plot S8