--- title: "Wet process of cement manufacture" subject: "Civil Engineering Materials" chapter: 5 key: "semester_3/civil_engineering_materials:cement-wet-process-flow-diagram" source: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/cement-wet-process-flow-diagram site: BCT Engineering --- # Wet process of cement manufacture Civil Engineering Materials · Chapter 5: Cement - Asked in: 2081 Baisakh (new course), 2 marks; 2081 Kartik (new course), 3 marks; 2081 Baisakh, 4+1 marks; 2076 Chaitra, 2 marks (asked 4 times) - Video: [Process of Cement Manufacturing | Wet Process | Dry Process | Civil Engineering |Cement| Shiwani Jha](https://www.youtube.com/watch?v=XAyVDiLEXcg) — Shiwani Jha - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/cement-wet-process-flow-diagram - Whole chapter: https://www.bctengineer.com/md/semester_3/civil_engineering_materials/chapter-5 ## Question Draw a flow chart and explain the manufacture of cement by the wet process. ## Short answer Chalk and clay are wet-ground into a slurry with 35-40% water, corrected for composition, and fed into a rotary kiln. After drying, calcination, and burning at 1400-1500°C, clinker forms, then cooled, ground with 3-5% gypsum. It ensures uniform mixing but requires more fuel. ## Answer In the **wet process**, the raw materials are ground with water into a slurry (35-40% water), which is fed to the rotary kiln. It is suitable when the raw materials are soft and wet, such as chalk and clay. #### Flow chart ```text Limestone/Chalk Clay | | Crushing Washing in wash mill | | +-----> Wash mill / Ball mill <--- water | Slurry (35-40% water) | Slurry tanks (correction) | Rotary kiln (1400-1500 C) | CLINKER | Cooler, then mix with 3-5% gypsum | Ball/tube mill | Cement silo | Packing/bags ``` #### Explanation 1. **Preparation of slurry:** limestone is crushed and fed to the wash mill/ball mill along with clay and water. Grinding gives a creamy slurry containing about 35-40% water. 2. **Correction:** the slurry is stored in tanks, tested for CaCO3 (about 75-78%) and corrected by adding limestone or clay until the composition is right. Compressed air keeps it agitated. 3. **Burning:** the slurry enters the upper end of an inclined rotary kiln (diameter 2.5-3.5 m, length about 90-150 m or more). In the drying zone the water evaporates (up to about 400 C); in the calcination zone CaCO3 breaks down into CaO and CO2 (about 900 C); and in the burning zone (1400-1500 C) the materials partly fuse into clinker nodules of 5-10 mm. 4. **Cooling and grinding:** the hot clinker is cooled, mixed with gypsum (about 3-5%) and ground to a fine powder in tube mills. 5. **Storage and packing:** the cement is stored in silos and packed into 50 kg bags. **Merits:** easy mixing and uniform composition; less dust. **Demerits:** higher fuel consumption, a longer kiln, and a slower, costlier process. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What is the water content of slurry in the wet process? A. 5-10% B. less than 1% C. 60-70% D. 35-40% Answer: D. Raw materials are ground with water to a slurry of 35-40% water. (Key point: Slurry) 2. In the wet process kiln, what is the order of zones from slurry feed end? A. Drying, calcination, burning B. Burning, calcination, drying C. Calcination, drying, burning D. Cooling, drying, burning Answer: A. Water evaporates first (to 400 C), then CaCO3 breaks into CaO and CO2 (about 900 C), then clinkering at 1400-1500 C. (Key point: Kiln zones) 3. Which is a demerit of the wet process? A. More dust B. More fuel consumption and longer kiln C. Poor mixing D. Non-uniform composition Answer: B. Water must be evaporated, so fuel use and kiln length increase; merits are easy mixing and less dust. (Key point: Wet process demerit) ## Related in Civil Engineering Materials - [Dry process of cement manufacture](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Acement-dry-process-flow-chart) — Civil Engineering Materials, chapter 5 - [Cement manufacture with flow diagram](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Acement-manufacture-flow-diagram) — Civil Engineering Materials, chapter 5, asked 5× - [When wet process is better than dry](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Awet-process-better-than-dry) — Civil Engineering Materials, chapter 5 ## Related in other subjects - [Preparing cement mortar by manual process](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Amortar-prep-manual) — Building Technology, chapter 3, asked 2× - [Remez exchange algorithm with flow chart](https://www.bctengineer.com/question.md?key=semester_7%2Fdigital_signal_analysis_and_processing%3Aremez-flowchart-explain) — Digital Signal Analysis and Processing, chapter 5, asked 4× - [Bilateral/unilateral gains and design flow chart](https://www.bctengineer.com/question.md?key=semester_7%2Frf_and_microwave_engineering%3Aamplifier-gains-flowchart-0-55) — RF and Microwave Engineering, chapter 6 - [Unilateral max gain with design flow chart](https://www.bctengineer.com/question.md?key=semester_7%2Frf_and_microwave_engineering%3Aunilateral-gain-flowchart) — RF and Microwave Engineering, chapter 6