Process for disintegrating material containing alkali-alkali earth silicate for yielding alkali silicate or alkali carbonate solutions and materials having a large specific surface

• US 4,140,510 A
• Filed: 06/06/1977
• Issued: 02/20/1979
• Est. Priority Date: 06/16/1976
• Status: Expired due to Term

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Scholze, Horst, Bakardjiev, Ivan V., Koutecky, Milan A.
• Primary Examiner(s): Kellogg, Arthur D.
• Application Number:
  US05/803,912
• Time in Patent Office: 624 Days
• Field of Search: 423/340, 423/339, 65/28, 65/30 R
• US Class Current: 65/28
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: C01B 33/32 Alkali metal silicates C01B33/24 , C01B33/26 take precedence

Abstract

A process for disintegrating material containing alkali-alkali earth silie for yielding alkali silicate or alkali carbonate solutions and materials having a large specific surface is characterized in that a material containing silicate is crushed and subsequently is treated in an autoclave at a temperature in excess of 100° C, preferably in excess of 130° C, with a solution containing alkali carbonate.

Claims

1. A process for disintegrating material containing an alkali-alkali earth silicate for yielding alkali silicate solutions and materials having a large specific surface, comprising the steps of:

(a) crushing a silicate-containing material;

(b) forming a mixture of substantial proportions of said crushed silicate-containing material, alkali carbonate and water;

(c) subjecting said mixture in an autoclave to a temperature in excess of 100°

C. up to about 200°

C. to cause hydrothermal, alkaline disintegration of said silicate-containing material and form an alkali silicate solution; and

(d) subjecting said alkali silicate solution to carbon dioxide to precipitate SiO₂ and reclaim an alkali carbonate solution.

2. A process according to claim 1 wherein said mixture is subjected to a temperature in excess of 130°

C.

3. A process according to claim 1 wherein said silicate-containing material is glass.

4. A process according to claim 1 wherein said alkali carbonate is Na₂ CO₃.

5. A cyclic process for disintegrating material containing alkali silicate comprising the steps set forth in claim 3 and the further step of utilizing said alkali carbonate in Step b) of claim 3.