US 7,597,839 B2 · Method for manufacturing artificial ultra-lightweight aggregate using raw sewage sludge

Abstract

This invention relates to a method for manufacturing an artificial ultra-lightweight aggregate having a specific gravity of 0.8-0.9 using raw sewage sludge. According to the invention, raw sewage sludge and water-free waste are mixed into a blend having a water content that allows the optimal extrusion, whereby excellent ultra-lightweight aggregate which has low water absorption rate and, low slump loss can be produced. In addition, the collective treatment of waste and the mass production of recycled products are possible without addition of a drying process for raw sewage sludge, and thus excellent ultra-lightweight aggregate can be supplied at low cost.

Claims10

Dependent claims

A method for manufacturing an artificial ultra-lightweight aggregate having a specific gravity of 0.8-0.9, the method comprising the steps of:

(a) mixing raw sewage sludge with dry steel sludge as dry inorganic waste, and primarily maturing the mixture;
(b) mixing the primarily matured material with clay, and secondarily maturing the clay-containing mixture;
(c) extruding the secondarily matured material;
(d) drying the extruded body;
and
(e) sintering the dried extruded body.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/433,095Filed 13 May 2006

Priority

KR 10-2005-007525917 Aug 2005

Published

US 2007/0040307 A122 Feb 2007

Granted

6 Oct 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

B09B 3/25
Agglomeration, binding or encapsulation of solid waste: using mineral binders or matrix
C04B 33/132
Compounding ingredients: waste materials; Refuse ; Residues
C04B 33/1321
Waste materials; Refuse ; Residues: waste slurries, e.g. harbour sludge, industrial muds
C04B 33/1324
Waste materials; Refuse ; Residues: recycled material, e.g. tile dust, stone waste, spent refractory material

Method for manufacturing artificial ultra-lightweight aggregate using raw sewage sludge

Life of this patent

Method for manufacturing artificial ultra-lightweight aggregate using raw sewage sludge

Life of this patent

Abstract

Claims10