Spray Roaster Acid Regeneration Plants

Our spray roaster acid regeneration plants recover bound and unbound chlorides from metal chloride solutions as azeotrope HCl at 18% strength. Metals contained in the feed solution are oxidized and separated as metal oxide powder.
Applications of this technology include:

	spent pickle liquor regeneration
	magnesium oxide production
	aluminum oxide production
	titanium dioxide production
	cobalt oxide production
	rare earth metal oxide production (such as cerium oxide)

Metal oxides are vacuum transported and safely contained in an airtight silo. They can be filled in big bags, industrial paper bags (20kg, 50kg) or silo trucks for shipment to secondary industries such as manufacturers of paints, pigments, ferrites, refractory materials, plastics and catalysts.

The core chemical conversion step performed inside a spray roaster hydrochloric acid regeneration plant is pyrohydrolysis. For spent pickle liquors the reaction equations are given as:

Those reactions happen inside the directly fired roasting furnace at temperatures between 500 and 900 degrees Celsius, depending on feed composition and furnace operating mode. Suitable fuels include:

	natural gas
	city gas
	propane or petroleum gas (LPG)
	coke oven gas
	mixed gas from coking and steel making
	liquified natural gas (LNG)
	light and heavy oils

Spray Roaster Hydrochloric Acid Regeneration Plants for the Carbon Steel Industry can be designed for treatment capacities between 300 and 15.000 liters per hour. Smaller plants can be premanufactured and pre-tested on skids, which shortens installation and commissioning time on site. Larger plants are typically tailored to customer layout specifications and assembled on site.

For the production of highly purified metal oxides various pre- and post-treatment technologies have been developed by SMS Siemag. We offer feed purification processes for the removal of undesirable metals and impurities, solvent extraction processes as well as thermal and chemical oxide post treatment processes for the reduction of residual chlorides and milling equipment for particle size adjustment and bulk density improvement.

Process Characteristics

Furnace Operating Principle