C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 18/02 (2006.01) C04B 2/06 (2006.01) C04B 18/08 (2006.01)
Patent
CA 2347403
This is a method for producing manufactured aggregates from coal combustion by-products having sulfur. Recycle fines containing calcium hydroxide, and aluminum-containing material, and water are mixed together to form a feed mix which is agglomerated into an agglomerated product. The agglomerated product is combined with curing fines which contain calcium oxide which together form a blended mix. The blended mix is cured using the moisture in the blended mix which is used to exothermally hydrate the calcium oxide in the blended mix to form calcium hydroxide and which autogenically provides the required heat for curing and converts the calcium oxide in the blended mix to a dry calcium hydroxide-containing material to form aggregate products and dry fines. The aggregate products are separated from the dry fines, the dry fines are recycled to the mixing step and the aggregates are taken and used as a useful product for other purposes.
L'invention concerne un procédé de production d'agrégats manufacturés à partir de produits dérivés de la combustion du charbon contenant du soufre. On mélange des fines recyclées renfermant de l'hydroxyde de calcium, un matériau contenant de l'aluminium, et de l'eau pour obtenir un mélange qui est aggloméré dans un produit aggloméré. On associe le produit aggloméré à des fines de durcissage contenant de l'oxyde de calcium qui constituent ensemble un mélange. On durcit ce mélange en utilisant l'humidité présente dans ce mélange, que l'on utilise pour hydrater exothermiquement l'oxyde de calcium dans ce mélange pour obtenir de l'hydroxyde de calcium, et qui fournit la chaleur nécessaire au durcissage et convertit l'oxyde de calcium dans le mélange en un matériau contenant un hydroxyde de calcium sec pour former des produits agrégats et des fines sèches. On sépare les produits agrégés des fines sèches, on recycle les fines sèches lors du mélange, et on utilise les agrégats en tant que produit utile à d'autres fins.
Wasson George E.
Wu Muh-Cheng M.
Consol Energy Inc.
Marks & Clerk
Universal Aggregates Llc
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