White cement introduction about white cement

Cement ball mill

1. White cement الاسمنت الابيض

2. White cement differs from grey cement by its colour

3. U s es It is used mostly for aesthetic reasons , Decorative purposes Reflection of solar radiation at hot cities .

4. Design For White Cement Typical production figures in the range of 30,000 to 300,000 ton of clinker per year. This is due to The limited marketing High specific energy consumption

5. Raw materials Limestone Kaolin Sand (white sand) Gypsum Calcium Florid as a flux material (to decrease the burning temperature of the materials)

6. Selection of raw materials Selection of raw materials must be avoiding Iron from the raw mill grinding media, Chromium from magnesite-chrome refractories in the kiln. Metallic oxides in the fuel ash The colour of the gypsum, which is ground with the clinker

7. The four means of contamination are avoided by Using hard forged media in raw mill Non – use of magnesite – chrome refractories in kiln Firing the kiln with natural gas or oil Selection of white or colorless gypsum

8. Controlling Factor C 3 S is preferred than C 2 S because traces of iron from solid solutions with C 2 S coloring the mineral On this basis, LSF should be high to maximize the whiteness of clinker Due to the lack of iron, raw mix is difficult to combine (burn), high temperatures achieved in kiln, fuel & refractory costs raised

9. Quenching of clinker White cement clinker usually is quenched in water immediately after leaving the kiln. Quenching of clinker to avoid the following Minerals (V, Fe , Mn , Cr) re-oxidation where there oxides causes cement colors. C 3 S C 2 S + free lime Where the free lime lowering the whiteness

10. D e sign Raw Materials Lime Stone , Kaolin , Sand , Gypsum & Calcium Fluoride (CaF 2 ) Sand Mill Ball Mill with ceramic balls grinding media Heat Exchanger Source of 2ary & 3ary air

11. D e sign Clinker Crusher Position: between kiln & cooler High temperatures produces big lumps Decolorizer (Rotary Cooler) Water spray system included for quenching Kiln Refractories Magnesite bricks to face high temperatures in burning zone ~ 1750 – 1800 o C

12. White cement plant

13. Sand Mill

14. Burning Plant

15. Clinker Decolorizer

16. Storages

17. Clinker Storage

18. Kiln

19. By Pass

20. Clin k er Drag Chain

21. Secondary air duct

22. Heat Exchanger

23. Clinker Decolorizer

24. Clinker crusher position

25. Clinker Crusher cooling

26. Using of Calcium Fluoride Used as Fluxing Agent Advantages Clinker production & whiteness increased Free lime & fuel consumption decreased Burnability becomes higher (easy to burn)

27. Using of Calcium Fluoride Disadvantages With high %, Blockages in kiln inlet & riser ducts Damage of refractory lining of preheater and kiln leads to damage in preheater steel walls & kiln shell Fluctuation in CaF 2 causes flushes (sudden flow of material) which lead to blockages