Process for improving low quality coal
AssigneeIdemitsu Kosan Co., Ltd.
InventorMasayuki Nakai
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Abstract
A process for improving low quality coal is disclosed, comprising subjecting a crushed low quality coal to a press treatment and a heat treatment. The process of the invention permits the production of improved coal from low quality coal, said improved coal having a high mechanical strength and a high density, and so forth, which realize the ease of handling in storage and transportation without a danger of spontaneous combustion.
Claims15
A process for treating coal having a high water content to obtain coal having a lower water content, said process comprising subjecting a coal having a high water content in crushed form to a press treatment at ambient temperature whereby said water-containing coal is pressed without heating and then heating said pressed coal at a temperature of from 250.degree. C. to 500.degree. C. for between 1 and 10 minutes.
A process for treating coal having a high water content selected from the group consisting of brown coal, lignite and a mixture thereof to obtain a coal having a lower water content, said process comprising subjecting a crushed coal having a high water content in crushed form having a diameter of up to 50 millimeters to a press treatment at ambient temperature whereby said water-containing coal is pressed without heating at a pressure of 30 to 200 megapascals and then heating said pressed coal at a temperature of 250.degree. C. to 500.degree. C. for between 1 and 10 minutes.
Dependencies are inferred from the claim text.