Technology Profile: Calcium Carbide Production from Limestone
By Intratec Solutions |
This column is based on “Calcium Carbide Production from Limestone – Cost Analysis,” a report published by Intratec. It can be found at: www.intratec.us/analysis/calcium-carbide-production-cost.
Calcium carbide is the most industrially relevant carbide because of its important role as the basis of the acetylene industry. In locations where there is a shortage of petroleum, calcium carbide is used as the starting material for the production of acetylene, which, in turn, can be used as a building block for a range of organic chemicals, such as vinyl acetate, acetaldehyde and acetic acid.
Figure 1. The process diagram shown here outlines a process for the production of calcium carbide from limestone[/caption]
The following describes a process for calcium carbide production from limestone and coke (Figure 1).
Feed preparation. Initially, coke is dried with hot air in a tray dryer to reduce moisture in the coke. After drying, the coke is transferred to the electric furnace. Limestone is crushed in a jaw crusher into a uniform particle-size range. Some gross impurities originating from the limestone are separated in a screener.
Lime kiln. The crushed limestone is calcined in a vertical-shaft lime kiln. The calcium…