Treatment of solid containing material derived from effluent

a technology of solid containing materials and effluent, which is applied in the direction of pulp liquor regeneration, inorganic compound addition, textiles and paper, etc., can solve the problems of affecting the optical properties of particulate products

a technology of solid containing materials and effluent, which is applied in the direction of pulp liquor regeneration, inorganic compound addition, textiles and paper, etc., can solve the problems of affecting the optical properties of particulate products

US20040055715A1Inactive Publication Date: 2004-03-25PHIPPS JONATHAN
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  • Treatment of solid containing material derived from effluent
  • Treatment of solid containing material derived from effluent
  • Treatment of solid containing material derived from effluent

Examples

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example

[0044] A deinking sludge having a calcium carbonate content of about 5% by weight and a kaolin content of about 40% by weight, based on the dry solids weight of the sludge, was treated in the manner described with reference to FIG. 1 by addition of dilute hydrochloric acid to dissolve the calcium carbonate present followed by incineration and calcination in a furnace at a temperature of about 1000.degree. C. for several hours overnight. The product obtained was redispersed in water and milled by sandgrinding and then subjected to the tests described later in this Example. The Product is there referred to as `Product 2`. For comparison purposes, a further product, Product 1, was made without acid dissolution by the more complicated and costly method described in EP798268 using carefully controlled incineration and calcination at a temperature of 750.degree. C.

[0045] Products 1 and 2 were tested as follows:

[0046] The ISO brightness was measured and the particle size distribution was m...

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Abstract

A method of treating solid containing material derived from effluent or sludge from a plant for de-inking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an acid to cause dissolution of the calcium thereby forming a calcium ion-containing solution in which insoluble solids are suspended, separating the solution from the insoluble solids and incinerating the separated solids. The solution containing calcium ions may be treated by adding one or more reagents to form a calcium compound precipitate, e.g., calcium carbonate. The particulate solids produced following the incineration step and following the precipitate formation may be employed as pigments or fillers in paper making or paper coating.

Description

[0001] This is a continuation-in-part application of U.S. application Ser. No. 10 / 300,913, filed Nov. 21, 2002, which is a continuation of U.S. application Ser. No. 09 / 996,931, filed Nov. 30, 2001 (Now Abandoned), which is a continuation of U.S. application Ser. No. 09 / 148,685, filed Nov. 22, 2000 (Now U.S. Pat. No. 6,425,973).[0002] 1. Field of the Invention[0003] The present invention relates to the treatment of solid containing material derived from effluent, especially to recover useful materials therefrom.[0004] In particular, this invention is concerned with a method for recovering useful materials from what has hitherto been regarded as the waste material produced by an industrial plant for treating paper, especially for de-inking waste paper.[0005] Paper and paperboard products are generally made by preparing a dilute aqueous suspension containing cellulosic fibres derived from wood or from some other suitable fibrous material, and de-watering the suspension on a moving wire...

Claims

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Application Information

Patent Timeline
25 Mar 2004
Publication
US20040055715A1
IPC
D21C11/00; D21H17/01; D21H17/67
CPC
D21C11/0007; D21H17/67; D21H17/01
Inventors
PHIPPS, JONATHAN