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Pulp Sludge Ash Composition for Producing Building Materials

a technology of building materials and sludge, which is applied in the field of pulp, can solve the problems of low industrial applicability, weakened bonding force between sodium silicate and metal oxides, and unsuitable pulp sludge itself to be discarded as landfills, etc., and achieves cost-efficient and time-efficient effects, excellent water resistance and strength

Inactive Publication Date: 2008-01-10
PARK JONG WON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] As can be seen from the foregoing, the cement-like composition according to the present invention, which comprises pulp sludge ash and the modified sodium silicate, shows excellent water resistance and strength, and thus is useful for various industrial fields as a building material, etc. The composition may further comprise various kinds of additives, if desired, to conform to the particular use thereof. Additionally, it is possible to transform various kinds of industrial wastes into the composition according to the present invention. Therefore, the present invention contributes to recycling of wastes and the protection of environment, and is cost-efficient and time-efficient.
[0021] While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment and the drawings. On the contrary, it is intended to cover various modifications and variations within the spirit and scope of the appended claims.

Problems solved by technology

However, pulp sludge itself is not suitable to be discarded as landfill because it is not solidified with ease due to its high water content.
Pulp sludge ash generated from such incineration has been thought to have low industrial applicability, and thus has been utilized in limited use (for example, a supplementary additive for cement).
However, there is a problem in that because sodium silicate per se has poor water resistance, the bonding force between sodium silicate and metal oxides is weakened after curing of the pulp sludge ash, due to the absorption of ambient water or moistures into the cured material.
There is another problem embedded in this method because it includes a steam-curing step performed at high temperature, which is not cost-efficient and has low industrial applicability.

Method used

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  • Pulp Sludge Ash Composition for Producing Building Materials
  • Pulp Sludge Ash Composition for Producing Building Materials
  • Pulp Sludge Ash Composition for Producing Building Materials

Examples

Experimental program
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Effect test

example 1

[0045] First, 60 parts of pulp sludge ash were provided. Next, 85 parts of modified sodium silicate were prepared by mixing 1,500 g of sodium silicate with an aqueous acidic solution with stirring. The acidic solution was obtained by introducing 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda and 1,000 g of chrome alum into an agitator, each in the form of an aqueous solution, and agitating the materials for 30 minutes. Then, 60 parts of pulp sludge were mixed with 85 parts of the modified sodium silicate to obtain a cement-like composition.

[0046] The pulp sludge ash composition was injected into a cylindrical mold having a diameter of 50 mm and a depth of 100 mm. Then, a bar having a weight of 1 kg and a diameter of 10 mm was placed on the mold at different times, and determined the initial curing completion time, when the molded product showed no physical changes in its surface and permitted demolding and handling. The composition removed from the mold w...

example 2

[0047] First, 60 parts of pulp sludge ash were provided. Next, 85 parts of modified sodium silicate were prepared by adding 300 g of 10% aqueous sodium lauryl sulfate solution and 1,000 g of aqueous caustic soda to 1,000 g of sodium silicate, agitating the materials for 30 minutes and further adding 300 g of 10% aqueous sulfuric acid solution thereto and further agitating the materials. Then, 60 parts of pulp sludge were mixed with 85 parts of the modified sodium silicate to obtain a cement-like composition.

[0048] The composition obtained in this Example was tested in the same manner as described in the above Example 1. The results are shown in the following Table 1.

example 3

[0049] First, 60 parts of pulp sludge ash were provided. Next, 85 parts of modified sodium silicate were prepared by mixing 1,500 g of sodium silicate with an aqueous acidic solution with stirring. The acidic solution was obtained by introducing 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda and 1,000 g of chrome alum into an agitator, each in the form of an aqueous solution, and agitating the materials for 30 minutes. Further, 30 g of latex and 3 g of silicone oil were added to 1,000 g of the acidic solution. Then, 60 parts of pulp sludge were mixed with 85 parts of the modified sodium silicate to obtain a cement-like composition.

[0050] The composition obtained in this Example was tested in the same manner as described in the above Example 1. The results are shown in the following Table 1.

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Abstract

Disclosed is a pulp sludge ash composition for producing building materials, which comprises pulp sludge ash combined with modified sodium silicate having an acidic group. The pulp sludge ash composition shows excellent water resistance and strength as well as improved physical properties, and thus is useful for various industrial fields as a building material, a civil engineering material, an interior material, a filler for a safe, or the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a pulp sludge ash composition for producing building materials. More particularly, the present invention relates to a pulp sludge ash composition for producing building materials, which comprises pulp sludge ash obtained by incineration of pulp sludge generated from a paper manufacturing process after a wastewater treatment step, and further comprises modified sodium silicate having an acidic group. The pulp sludge ash composition according to the present invention allows fast curing with no need for additional baking or sintering. Additionally, the above pulp sludge ash composition further comprising a polymer emulsion shows excellent strength and water resistance. BACKGROUND ART [0002] In general, pulp sludge is generated from a paper manufacturing process after a wastewater treatment step, in a great amount. Most of the pulp sludge has been discarded in a landfill. However, pulp sludge itself is not suitable to be discarded ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/01
CPCC04B28/26C04B14/06C04B14/18C04B18/08C04B18/103C04B18/26C04B20/0048C04B22/062C04B22/106C04B22/141C04B22/142C04B24/2641C04B24/383C04B38/02C04B14/104C04B14/20C04B16/08C04B18/101C04B18/141C04B22/064C04B22/122C04B24/281Y02W30/91D21H17/01D21H17/68
Inventor PARK, JONG-WON
Owner PARK JONG WON
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