Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Process for producing cement
The present invention relates to a process for producing cement. Heavy metals including lead are efficiently separated from cement production steps without exerting any influence on cement quality while ensuring the safety of the cement production apparatus and avoiding an increase in environmental burden. A combustible substance containing at least 20 mass% carbon matter is supplied to that region in a cement kiln which has a temperature of 900-1,300 DEG C. A kiln discharge gas passage extending from the bottom of the cement kiln to a lowermost-stage cyclone is bled of part of the combustion gas, and the dust contained in the combustion gas is collected. Heavy metals are separated from the dust collected. In the region of the cement kiln, the heavy metals can be volatilized at a volatilization ratio of 80% or higher. When the carbon matter content in the combustible substance is expressed by alpha mass% and the amount of the carbon-matter-containing combustible substance to be introduced into the cement kiln is expressed by beta kg per ton of clinker production, then the product of alpha and beta preferably is 30 to 5,000.
Process for producing cement
The present invention relates to a process for producing cement. Heavy metals including lead are efficiently separated from cement production steps without exerting any influence on cement quality while ensuring the safety of the cement production apparatus and avoiding an increase in environmental burden. A combustible substance containing at least 20 mass% carbon matter is supplied to that region in a cement kiln which has a temperature of 900-1,300 DEG C. A kiln discharge gas passage extending from the bottom of the cement kiln to a lowermost-stage cyclone is bled of part of the combustion gas, and the dust contained in the combustion gas is collected. Heavy metals are separated from the dust collected. In the region of the cement kiln, the heavy metals can be volatilized at a volatilization ratio of 80% or higher. When the carbon matter content in the combustible substance is expressed by alpha mass% and the amount of the carbon-matter-containing combustible substance to be introduced into the cement kiln is expressed by beta kg per ton of clinker production, then the product of alpha and beta preferably is 30 to 5,000.
Process for producing cement
TERASAKI JUNICHI (Autor:in) / SAITO SHINICHIRO (Autor:in) / HAYASHIDA TAKAHIRO (Autor:in) / OGAWA YOSHIHISA (Autor:in)
03.06.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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