Process for producing fibrous and granular materials from waste
First Claim
1. A process for producing a fibrous material and a granular material from solid household, agricultural, forestry, or industrial waste, said waste containing both inorganic and organic portions, comprising treating substantially the entirety of the waste by the steps of:
- (a) dividing the waste into at least three first fractions including a fine fraction of particles which are smaller than a required final particle size, a mainly light coarse fraction of particles that are easy to reduce in size mechanically, and a mainly heavy coarse fraction of particles that are difficult to reduce in size mechanically;
(b) separately reducing the particle size of said coarse fractions to said required final particle size;
(c) re-uniting all said first fractions;
(d) drying the re-united first fractions to a predetermined maximum residual moisture content and sterilizing said re-united first fractions;
(e) dividing the re-united, dried, sterilized first fractions into at least two final fractions, said at least two final fractions including a fibrous fraction and a granular fraction.
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Accused Products
Abstract
In order to avoid producing any secondary waste in the production of a fibrous and a granular material from household, agricultural, forestry waste, organic waste of the manufacturing and/or service industries, the primary waste first undergoes an opening treatment in an opening unit and then, after removal of any metallic components by magnetic separation units, is divided into three fractions. Such division is effected by a fractioning unit into (a) a fine fraction not exceeding the required final product particle size, (b) a coarse fraction easy to process mechanically, and (c) a coarse fraction difficult to process mechanically. The two coarse fractions are then separately reduced to the required final product particle size in reducing unit optimally suited to the particular coarse fraction. Then all three fractions are re-united and dried to a specific maximum residual moisture content and sterilized in a drying unit by heating and extraction of the resultant steam, and are jointly fractionated by a further fractionating unit and air separators into a heavy fraction consisting chiefly of inorganic granulate, a light fraction consisting chiefly of organic fibres, and a dust fraction consisting chiefly of organic dust particles.
53 Citations
17 Claims
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1. A process for producing a fibrous material and a granular material from solid household, agricultural, forestry, or industrial waste, said waste containing both inorganic and organic portions, comprising treating substantially the entirety of the waste by the steps of:
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(a) dividing the waste into at least three first fractions including a fine fraction of particles which are smaller than a required final particle size, a mainly light coarse fraction of particles that are easy to reduce in size mechanically, and a mainly heavy coarse fraction of particles that are difficult to reduce in size mechanically; (b) separately reducing the particle size of said coarse fractions to said required final particle size; (c) re-uniting all said first fractions; (d) drying the re-united first fractions to a predetermined maximum residual moisture content and sterilizing said re-united first fractions; (e) dividing the re-united, dried, sterilized first fractions into at least two final fractions, said at least two final fractions including a fibrous fraction and a granular fraction. - View Dependent Claims (2, 3, 4)
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5. A process for producing a fibrous material and a granular material from substantially solid household, agricultural, forestry or industrial waste, said waste containing both inorganic and organic portions, comprising the steps of:
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(a) mechanically prereducing the particle size of the waste to be processed; (b) treating substantially the entirety of the prereduced waste by dividing the prereduced waste into at least two first fractions by specific gravity, said at least two first fractions including a first light fraction and a first heavy fraction; (c) separately mechanically reducing the particle size of said first light fraction and said first heavy fraction; (d) re-uniting all of said first fractions of step (b); (e) drying the re-united first fractions to a predetermined maximum residual moisture content and sterilizing said re-united first fractions; (f) dividing the sterilized re-united first fractions into at least two final fractions, said at least two final fractions including a light fibrous fraction consisting essentially of organic fibers and a heavy granular fraction consisting essentially of inorganic granulate. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification