Assertion: lignite | /r/CapableOf | passed
Facets:
Source sentences:
text: By continuing to supply sufficient quantities of combustion air to the furnace hearths to assure complete combustion of the lignite volatiles in at least the first hearth and in the stack and by controlling the temperatures in the first three hearths of the furnace, the lignite is then able to be passed to succeeding hearths temperatures in the range of approximately 900° to 1250° F whereby critical control of the degree of volatile removal of the lignite is obtained in order to produce the specification char for industry which is satisfactory for use in the manufacture of briquettes for cooking.