US 9,517,965 B2 · Method for preparing a soda-lime-silica glass basic formulation and a method for extracting aluminum from coal ash for co-production of glass

Abstract

The present invention discloses a method for preparing a soda-lime-silica glass basic formulation and a method for producing soda-lime-silica glass, comprising the steps of: pre-desiliconizing silicon-containing powdery industrial waste with a sodium hydroxide solution; introducing carbon dioxide for carbonation decomposition, and filtering to obtain a silicic acid precipitate and a sodium carbonate solution; drying the silicic acid precipitate to obtain silicon dioxide; adding lime milk into the filtered sodium carbonate for causticization, and filtering to obtain a sodium hydroxide solution and a calcium carbonate precipitate; drying the calcium carbonate precipitate; using said silicon dioxide and part of the calcium carbonate and adding sodium oxide. The present invention further discloses a method for extracting aluminum from coal ash for co-production of soda lime glass, which uses silicon dioxide obtained from alkali dissolution and desiliconization of coal ash and calcium carbonate generated from causticization as main raw materials. The method for extracting aluminum from coal ash for co-production of soda lime glass according to the present invention integrates and optimizes a process of extracting aluminum from the coal ash, has a high material and energy utilization rate, good quality of co-product glass, and high added value, and can greatly improve economical efficiency of aluminum extraction of coal ash.

Claims21

Dependent claims

A method for preparing a soda-lime-silica glass basic formulation, comprising the steps of:

a1) pre-desiliconizing silicon-containing powdery industrial waste with a sodium hydroxide solution, and separating, to obtain a pre-desiliconization mother liquor and residues, wherein the mass concentration of sodium hydroxide in the sodium hydroxide solution is 10% to 50%, the mass ratio of silicon-containing powdery industrial waste to sodium hydroxide is 100:15 to 100:150 and the mass ratio of SiO2 to Al2O in the pre-desiliconized mother liquor is greater than 6:1;
a2) introducing carbon dioxide to the pre-desiliconization mother liquor for carbonation decomposition, and separating, to obtain a silicic acid precipitate and a sodium carbonate solution;
a3) drying the silicic acid precipitate to obtain silicon dioxide;
a4) adding lime milk into the sodium carbonate solution for causticization, and separating, to obtain a calcium carbonate precipitate and a sodium hydroxide solution;
a5) drying the calcium carbonate precipitate;
and
a6) combining the silicon dioxide prepared in step a3), part of the dried calcium carbonate from step a5), and sodium oxide, to obtain a soda-lime-silica glass basic formulation.

4 more elements

A method for extracting aluminum from coal ash for co-production of glass, comprising the steps of:

b1) pre-desiliconizing coal ash with a sodium hydroxide solution, and separating, to obtain a pre-desiliconization mother liquor and residues;
b2) introducing carbon dioxide to the pre-desiliconization mother liquor for carbonation decomposition, and separating, to obtain a silicic acid precipitate and a sodium carbonate solution;
b3) drying the silicic acid precipitate to obtain silicon dioxide;
b4) adding lime milk into the sodium carbonate solution for causticization, and separating, to obtain a calcium carbonate precipitate and a sodium hydroxide solution;
b5) drying the calcium carbonate precipitate;
b6) combining the silicon dioxide prepared in step b3), part of the dried calcium carbonate from step b5), and sodium oxide, to obtain a soda-lime-silica glass basic formulation;
and
b7) performing aluminum extraction by using the resulting residues obtained in step b1).

5 more elements

Dependencies are inferred from the claim text.

Method for preparing a soda-lime-silica glass basic formulation and a method for extracting aluminum from coal ash for co-production of glass

Life of this patent

Method for preparing a soda-lime-silica glass basic formulation and a method for extracting aluminum from coal ash for co-production of glass

Life of this patent

Abstract

Claims21