Method for reprocessing solid combustion products of coal

Abstract

A method for reprocessing solid combustion products includes the combustion products first being mixed with a base before the mixture obtained is sintered, wherein the sintered mixture can be washed out with an acid solution after sintering.

1 - 14 . (canceled) 
     
     
         15 . A method for reprocessing solid combustion products of coal, comprising the steps of mixing the combustion products with a base to form a mixture; sintering the mixture; before the obtained washing out the sintered mixture with an acid solution after sintering, wherein said base is selected for the group consisting of a mineral base, a base comprising an element from the family of alkali metals and/or alkaline earth metals, is one of potassium and sodium, hydroxides, hydrogen sulfites, carbonates of alkali metals, and alkaline earth metals, and wherein said acid solution is selected from the group consisting of a mineral acid, nitric acid, hydrochloric acid, chloric acid (HClO 3 ), and an aqueous solution of one of said acids. 
     
     
         16 . The method for reprocessing combustion products according to  claim 15 , wherein said base is added to the combustion products in a stoichiometric or hyperstoichiometric amount in relation to a concentration of silicon (Si) and/or silicon dioxide (SiO 2 ), wherein the ratio, of the base to silicon (Si) and/or silicon dioxide (SiO 2 ) is greater than or equal to 1. 
     
     
         17 . The method for reprocessing combustion products according to  claim 15 , wherein said sintering step occurs at a temperature of 100° C. to 2000° C. over a period of 0.1 hours to 4 hours. 
     
     
         18 . The method for reprocessing combustion products according to  claim 15 , further comprising adding the acid solution for washing out is to the sintered mixture of the combustion products and the base, and wherein the washing solution and washed-out residues of the sintered mixture of the combustion products and the base are then or simultaneously separated by filtration. 
     
     
         19 . The method for reprocessing combustion products according to  claim 15 , wherein the acid for washing out is added to the combustion products at a stoichiometric or hyperstoichiometric amount in relation to a concentration of oxides and/or oxides that form primary components of the combustion products, and/or silicon (Si) and/or silicon dioxide (SiO 2 ) and/or aluminum (Al) and/or aluminum oxide (Al 2 O 3 ) and/or sodium (Na) and/or sodium oxide (Na 2 O), wherein a ratio, of acid to oxides and/or the oxides that represent the primary components of the combustion products, and/or to silicon (Si) and/or to silicon dioxide (SiO 2 ) and/or to aluminum (Al) and/or to aluminum oxide (Al 2 O 3 ) and/or to sodium (Na) and/or sodium oxide (Na 2 O) is greater than or equal to 1. 
     
     
         20 . The method for reprocessing combustion products according to  claim 15 , further comprising adding the acid solution for washing out at room temperature to the sintered mixture of the combustion products and the base, and heating the mixture of the acid solution and sintered mixture of the combustion products and the base at a temperature between 25° C. and 300° C. before the washing solution and washed out residues of the sintered mixture of the combustion products and the base are separated by filtration. 
     
     
         21 . The method for reprocessing combustion products to  claim 20 , further comprising forming a gel. 
     
     
         22 . The method for reprocessing combustion products according to  claim 21 , further comprising the gel during washing out and considering a washed-out residue of the sintered mixture of the combustion products, and drying the base at a temperature between 20° C. and 500° C. after being separated from any possible remaining part of the washing solution. 
     
     
         23 . The method for reprocessing combustion products according to  claim 21 , further comprising crushing or grinding the gel in one or a plurality of steps. 
     
     
         24 . The method for reprocessing combustion products according to  claim 23 , further comprising washing out the crusted or ground gel with an acid solution in one and/or a plurality of steps, and separating the washing solution and the washed out residues of the gel. 
     
     
         25 . The method for reprocessing combustion products according to  claim 15 , further comprising drying the washed out residues and annealing said residues at a temperature between 250° C. and 3000° C. 
     
     
         26 . The method for reprocessing combustion products according to  claim 15 , further comprising drying the base and/or the combustion products at a temperature greater than or equal to 50° C. for a period of between 0.1 hours and 4 hours before the base and the combustion products are mixed. 
     
     
         27 . The method for reprocessing combustion products according to  claim 15 , further comprising drying the mixture of the combustion products and the base at a temperature greater than or equal to 50° C. for a period of between 0.1 hours and 4 hours before sintering. 
     
     
         28 . The method for reprocessing combustion products according to  claim 15 , further comprising grinding the sintered mixture of the combustion products and the base that is obtained after sintering in at least one step before being washed out with an acid solution.