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Title: Energy conserving process for calcining clay

This patent describes an energy conversing process for calcining a clay. It comprises feeding a dry pulverized clay powder as feed material to a calciner to be calcined therein; passing the clay powder to be calcined through the calciner in direct heat exchange contact with a hot calcining gas passing therethrough whereby the clay powder is sufficiently heated to calcine substantially all the clay powder passing through the calciner and the hot calcining has is somewhat cooled; removing the calcined clay powder from the calciner and discharging the calcining from the calciner; subjecting the calciner discharge gas to electrostatic precipitation to clean the calciner discharge gas prior to venting the calciner discharge gas to the atmosphere whereby at least a substantial portion of calcined clay powder entrained in the calciner discharge gas is removed therefrom; collecting the hot calcined clay powder separated from the gas during electrostatic precipitation and mixing the collected hot calcined clay powder with the clay feed material being supplied to the calciner without substantially cooling the collected hot calcined clay powder prior to mixing with the feed material; and passing the calciner discharge has in heat exchange relationship with at least a portion of a coolingmore » fluid prior to subjecting the calciner discharge gas to electrostatic precipitation.« less
Authors:
Publication Date:
OSTI Identifier:
6569813
Report Number(s):
US 4948362; A
PPN: US s 7-270176
Resource Type:
Patent
Resource Relation:
Patent File Date: 14 Nov 1988
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 02 PETROLEUM; 54 ENVIRONMENTAL SCIENCES; CALCINED WASTES; ENERGY CONSERVATION; INDUSTRIAL WASTES; AIR POLLUTION CONTROL; CALCINATION; CLAYS; ELECTROSTATIC PRECIPITATORS; PULVERIZED FUELS; WASTE PROCESSING; CHEMICAL REACTIONS; CONTROL; DECOMPOSITION; EQUIPMENT; MANAGEMENT; MATERIALS; POLLUTION CONTROL; POLLUTION CONTROL EQUIPMENT; PROCESSING; PYROLYSIS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; THERMOCHEMICAL PROCESSES; WASTE MANAGEMENT; WASTES 320305* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management; 020800 -- Petroleum-- Waste Management; 540120 -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-)