{"id":3778,"date":"2026-07-30T16:52:26","date_gmt":"2026-07-30T08:52:26","guid":{"rendered":"https:\/\/www.sopplant.com\/?p=3778"},"modified":"2026-07-29T16:59:44","modified_gmt":"2026-07-29T08:59:44","slug":"cleaner-calcium-chloride-plant-emission-control","status":"publish","type":"post","link":"https:\/\/www.sopplant.com\/fr\/cleaner-calcium-chloride-plant-emission-control\/","title":{"rendered":"Cleaner Calcium Chloride Plant Emission Control"},"content":{"rendered":"

\"Cleaner<\/p>\n

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A calcium chloride production line<\/u><\/a>\u00a0seems to be fairly straightforward. First, hydrochloric acid reacts with limestone to produce a calcium liquid which then has water removed from it. The resulting product is then dried or granulated. The real questions are however, where does the tail gas go, where does the dust go, where does the acid mist go and where does the washing liquid go.<\/p>\n

When buyers are planning the construction of a new calcium chloride plant, environmental design will have influence on arrangement of equipment, required fan pressure, size of scrubber and pipes, choice of dryer, packaging room, approval requirements and amount of losses with the product. A plant that only treats emissions at the stack may still lose powder in the workshop, cause corrosion to steel and put an excessive load on the washing system after a change of raw acid.<\/p>\n

Why Environmental Design Starts at Process Selection<\/b><\/strong><\/h2>\n

The environmental load of a calcium chloride production line is fixed early. Raw acid source, acid concentration, limestone quality, target product form, moisture level, and capacity all change gas washing, dust collection, and liquid treatment design.<\/p>\n

By-product HCl needs closer testing. Suspended solids, iron, sulfate, organics, and unstable acid concentration can create foam, scaling, odor, or sludge in the washing system.<\/p>\n

Product form also matters. Liquid calcium chloride normally has less drying dust. Flake, pellet, powder, and anhydrous calcium chloride production need stronger control around the dryer, cooler, screen, conveyor, and packing station.<\/p>\n

Main Emission Sources in a Calcium Chloride Production Line<\/b><\/strong><\/h2>\n

A clean plant layout follows the emission path from raw material entry to finished bag storage. Most problems start at familiar points.<\/p>\n\n\n\n\n\n\n\n\n\n
Process area<\/b><\/strong><\/td>\nMain risk<\/b><\/strong><\/td>\nPractical control point<\/b><\/strong><\/td>\n<\/tr>\n
HCl storage and dosing<\/td>\nAcid mist, corrosion<\/td>\nClosed tank, vent washing, resistant pipelines<\/td>\n<\/tr>\n
Reaction system<\/td>\nTail gas, foam, droplets<\/td>\nGas collection, wet scrubber, demister<\/td>\n<\/tr>\n
Drying and granulation<\/td>\nHot exhaust, fine dust<\/td>\nSpray fluidized bed drying, dust collection<\/td>\n<\/tr>\n
Cooling and screening<\/td>\nProduct dust, caking risk<\/td>\nSealed transfer, local suction<\/td>\n<\/tr>\n
Emballage<\/td>\nAirborne powder<\/td>\nBagging hood, dust collector<\/td>\n<\/tr>\n
Scrubber circulation<\/td>\nSalts, slurry, blowdown<\/td>\nRecycling, neutralization, sludge removal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

These points decide whether the plant runs cleanly during a normal shift, not only during a short acceptance test.<\/p>\n

Tail Gas Treatment: Capture First, Wash Second<\/b><\/strong><\/h2>\n

\"Ligne<\/p>\n

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Tail gas treatment in calcium chloride production starts with capture. If vents, tank openings, and reaction points are not kept under proper suction, the scrubber may be well sized but still fail to keep the workshop clean.<\/p>\n

Reaction vents and acidic gas<\/b><\/strong><\/h3>\n

In the hydrochloric acid and limestone process, gas may carry carbon dioxide, moisture, acid droplets, and trace impurities from the raw acid. The gas stream should be collected near the source and moved through corrosion-resistant ducting. Gas-liquid separation before the scrubber helps keep droplets out of fans and packed towers.<\/p>\n

Wet scrubbers are commonly used for acid gas control because HCl is highly water soluble. A typical system may include a gas collection header, induced draft fan, packed washing tower, circulation tank, mist eliminator, and clean stack.<\/p>\n

Drying exhaust and desulfurization washing<\/b><\/strong><\/h3>\n

Drying exhaust is hot, humid, and may carry fine calcium chloride particles. In a calcium chloride production line using spray fluidized bed drying, exhaust treatment should handle both dust and soluble gas. If dust is not removed before washing, the scrubber liquid can thicken and block nozzles or packing.<\/p>\n

Dust Control Around Drying, Cooling, and Packing<\/b><\/strong><\/h2>\n

Calcium chloride dust is more than an air quality issue. Because calcium chloride absorbs moisture easily, fine powder can stick to floors, motors, ducts, and bag surfaces. In export packing, dusty bags can also cause complaints even when the chemical grade is acceptable.<\/p>\n

Where calcium chloride dust appears<\/b><\/strong><\/h3>\n

Dust usually appears when hot dried material leaves the dryer, when particles rub against each other in cooling or screening, and when bags are filled too fast. Powder grades need stronger dust capture than pellet or flake grades. Still, even pellet production can create fines if granulation is unstable.<\/p>\n

A practical dust control plan includes:<\/p>\n