Pulp Sludge Ash Composition for Producing Building Materials

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.

1 . A pulp sludge ash composition for producing building materials, which comprises pulp sludge ash combined with modified sodium silicate having an acidic group.  
   
   
       2 . The pulp sludge ash composition for producing building materials according to  claim 1 , wherein the modified sodium silicate having an acidic group further comprises a polymer emulsion.  
   
   
       3 . The pulp sludge ash composition for producing building materials according to  claim 1 , wherein the modified sodium silicate having an acidic group is obtained by mixing sodium silicate with any one selected from the group consisting of aqueous sodium sulfate, copper sulfate, iron sulfate, aluminum sulfate, magnesium sulfate, potassium bicarbonate, chrome alum, sulfuric acid and hydrochloric acid solutions, and mixtures thereof.  
   
   
       4 . The pulp sludge ash composition for producing building materials according to  claim 3 , wherein caustic soda is further added as a catalyst.  
   
   
       5 . The pulp sludge ash composition for producing building materials according to  claim 1 , wherein the modified sodium silicate having an acidic group is obtained by introducing sodium silicate, 10% aqueous sodium lauryl sulfate solution, caustic soda and aqueous sulfuric acid solution into an agitator, followed by agitation.  
   
   
       6 . The pulp sludge ash composition for producing building materials according to  claim 2 , wherein the polymer emulsion is any one selected from the group consisting of latex, silicone resin, gum arabic, acrylic resins and epoxy resins.  
   
   
       7 . The pulp sludge ash composition for producing building materials according to  claim 3 , wherein the pulp sludge ash and the modified sodium silicate having an acidic group are mixed in a ratio of 1:1.2˜2.  
   
   
       8 . The pulp sludge ash composition for producing building materials according to  claim 1 , which further comprises any one selected from the group consisting of dust, fly ash, sand, slag, gypsum, lime and molding sand, in order to increase the strength.  
   
   
       9 . The pulp sludge ash composition for producing building materials according to  claim 1 , which further comprises any one light-weight additive selected from the group consisting of wood powder, pearlite, vermiculite, Styrofoam particles and a foaming agent, in order to reduce the specific gravity.  
   
   
       10 . The pulp sludge ash composition for producing building materials according to  claim 9 , which further comprises organic bentonite or methyl cellulose, in order to accomplish a uniform distribution when adding the additives.  
   
   
       11 . The pulp sludge ash composition for producing building materials according to  claim 1 , which further comprises any one selected from the group consisting of wire mesh, waste fiber and fiber in order to improve the bending strength.