Method for calcining cement by carbide slag replacing whole limestone
A calcium carbide slag and limestone technology is applied in the field of inorganic non-metallic materials to achieve the effects of reducing heat consumption, reducing CO2 emissions and reducing production costs
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[0029] With reference to accompanying drawing 1 and Fig. 2.
[0030] Calcium carbide slag is used to replace limestone to calcined cement. Carbide slag is used as calcareous raw material, and dry method pre-decomposition cement production technology is adopted outside the kiln. Its characteristics are: 100% use carbide slag to replace limestone to calcined cement clinker. The process includes,
[0031] (1) Carbide slag preheating and pre-decomposition
[0032] The cyclone preheater and calciner system are used to preheat and pre-decompose the carbide slag raw meal. The decomposition temperature of carbide slag is 380-550°C, and the outlet temperature of the calciner is 550-750°C;
[0033] The calcium carbide slag preheater system adopts a two-stage or three-stage cyclone preheater. Moreover, the secondary preheater and the tertiary cyclone preheater can be switched. The preheater system can be a single series or a double series cyclone preheater system.
[0034] (2) Combina...
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