Hardening granulated material at elevated temperatures

Details Hardening granulated material at elevated temperatures Hardening granulated material at elevated temperatures

1987-07-22

1989-11-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

106DIG1, 264 37, 264117, 264122, 264DIG49, B29B 916

Patent

active

048805823

ABSTRACT:
A process for manufacturing hardened granules produced by mixing at least fly ash obtained from combustion of a material selected from a coal product and lignite, a binder and water, forming granules of said mixture, hardening said granules in an embedding material at a temperature between 85.degree. and 212.degree. F. by applying heat and separating the hardened granules from the embedding material, said embedding material being used for forming new granules, including the step of embedding the non hardened granules after granulation in a hardening reactor in a fine grained material with a water absorption capacity of at least 8% and being free from a compound generating heat by contacting water, and supplying heat to the mixture of granules and embedding material in said hardening reactor by introducing steam into the mixture of granules and embedding material as present in the hardening reactor to raise and maintain the temperature at a value comprised between 85.degree. F. and 212.degree. F., the ratio between the quantity of embedding material and granules being comprised between 0.2 and 1.

REFERENCES:
patent: 4219519 (1980-08-01), Goksel
patent: 4264543 (1981-04-01), Valenta
patent: 4394176 (1983-07-01), Loggers
patent: 4419312 (1983-12-01), Loggers et al.
patent: 4490178 (1984-12-01), Loggers et al.
WO84/01367 Apr. 12, 1984.

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