Blue lime
Blaukalk (also: Karbidkalk outdated even Buna lime) is mainly composed of calcium existing ( "hydrated lime") residue from the acetylene -production. In this process, calcium carbide (“carbide”) is reacted with water; Acetylene is formed as well as a blue-gray by-product, which consists of around 85–95% calcium hydroxide, 1–10% calcium carbonate and 1–3% carbon and silicates and is produced as more or less aqueous sludge due to different process conditions.
The calcium hydroxide-containing residue (Ca (OH) 2 ) from this reaction is called "blue lime".
Blue lime is dumped as a waste product or can be processed into cement . Direct use in the construction industry as a carbide lime mortar was also common in the past. If it is used as a fertilizer, the possible exposure to toxins that end up in the sludge through landfilling with other production residues must be taken into account.
Individual evidence
- ↑ Jochen Stark, Bernd Wicht: Cement and Lime: The Building Material as a Material, p.340 , Springer-Verlag, 2013
- ^ Notes on the black market in blue lime , ORF Carinthia, December 2, 2014
- ↑ Fábio A. Cardoso, Heloísa C. Fernandes, Rafael G. Pileggi, Maria A. Cincotto, Vanderley M. John: Carbide lime and industrial hydrated lime characterization. In: Powder Technology . tape 195 , no. 2 , October 2009, p. 143-149 , doi : 10.1016 / j.powtec.2009.05.017 .
- ↑ HCB: U-turn at Wietersdorfer , ORF Carinthia, December 10, 2014
- ↑ Blue lime continued to burn in the cement works on kurier.at
- ↑ Carbide lime and its utilization. 2nd edition, Deutscher Acetylenverein eV, Berlin-Friedenau, 1941.
- ↑ Federal Environment Agency : Contaminated site K 20 lime landfill I / II. , Contaminated Sites Atlas - Carinthia, accessed on January 22, 2015.
- ^ Poisonous blue limestone could have landed on Carinthian fields , Der Standard, December 11, 2014