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US 5,500,044 AGranted
Process for forming aggregate; and product
AssigneeGreengrove Corporation
InventorsWilliam D. Meade, John W. Pearson
Life of this patent
Estimating the term…
Abstract
A process for forming an ash aggregate is provided. The process involves mixing a cellulose sludge material with an ash component. The ash component may comprise fly ash or sanitary waste ash in combination with fly ash. The sludge component preferably comprises paper mill sludge or pulp mill sludge. The hard lightweight aggregate may be utilized in a variety of manners, for example, to provide lightweight concrete and lightweight concrete mixes.
Claims19
A process for preparing a hardened aggregate;
- said process comprising the steps of:
- (a) mixing raw material mixture including a sludge component and an ash component;
- (i) said raw material mixture comprising at least 66% by weight, based on dry weight, sludge component;
- and at least 20%, by weight, based on dry weight, ash component;
- a ratio of dry weight sludge to ash component being within a range of 2/1 to 4/1;
- said sludge component being selected from the group consisting of pulp mill sludge, paper mill sludge, and mixtures thereof;
- (b) pelletizing said raw material mixture resulting from step (a);
- and
- (c) indurating said pelletized material mixture, wherein said step of indurating (c) directly follows said step of pelletizing (b).
6 more elements
Dependencies are inferred from the claim text.