Baking powder from coal? Sounds weird, but to actually get a pilot plant in Duisburg: exhaust gas of coke production, into deer horn salt, which is suitable even for baking Christmas cookies. But also as a raw material for fertilizer.
For the production of liquid cast iron in blast furnaces, you need coke as fuel. A lot of Coke. Alone for Duisburg melting furnaces, the coking plant produces 2.6 million tons Schwelgern (KBS) annually. “This coal at high temperatures is baked in the coking plant. The hot gases in this process a number of substances with lead”, explains Holger Thielert ThyssenKrupp industrial solutions. To exploit them as raw materials, the company with the coking plant has commissioned a pilot plant in operation Schwelgern and the Technical University of Berlin in Duisburg.
Plant emissions into baking soda
The plant uses the exhaust for the production of so-called stag Horn salt, which can be used, for example, than baking soda. How it works? “In the pilot plant, coke oven salt is washed in a complex process”, explains Thielert. “Ammonium bicarbonate – colloquially known as stag Horn salt is produced in the presence of carbon dioxide.” Christmas bakeries used centuries ago salt. Because it ensures that heavy and compact dough from gingerbread and cookie barely go up, but are loose and elastic.
In Duisburg, first practice tests at full speed run
First practice test results exist already and are promising: “95% of the ammonia in coke oven gas can be used”, says of Sebastian Masud Royal Technical University of Berlin. “Solids resulting from 15 qm3 coke oven gas and 2 qm3 carbon dioxide per hour 15 kg.”
From the deer horn salt theoretically other chemistry products to marketable cost to be produced, for example, stitch fabric fertilizer as well as fuel and foaming for plastics or porous ceramics.
Plant the world may be used
The investment in the environmental strategy of the coking plant Schwelgern fits perfectly up: “already almost all applicable process gases are used here in Duisburg as efficiently as possible”, explains KBS CEO Peter Liszio. “We succeed now still in the long term, both to produce removable products for other industries from the coke oven gases in the market and at the same time to reduce the CO2 emissions of the metallurgical plant, the real added value would be of even the environment will benefit.” In the future even world, positive progress, the system may be used.