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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 production costs, reducing greenhouse gas effects and reducing equipment costs

Active Publication Date: 2011-09-07
TIANJIN CEMENT IND DESIGN & RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current recycling treatment of calcium carbide slag and the existing new dry pre-decomposition technology cannot 100% use calcium carbide slag instead of limestone to calcined cement clinker, and to provide a two-stage or three-stage preheater. A new method of processing calcium carbide slag in the "high-temperature combustion, medium-temperature decomposition" decomposition furnace, using this method can 100% use calcium carbide slag instead of limestone to calcined cement clinker

Method used

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  • Method for calcining cement by carbide slag replacing whole limestone
  • Method for calcining cement by carbide slag replacing whole limestone
  • Method for calcining cement by carbide slag replacing whole limestone

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Embodiment 1

[0029] Refer to attached figure 1 and figure 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) Combination of ...

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Abstract

The invention relates to a method of using carbide slag to replace all limestone for calcining cement, which belongs to the inorganic non-metallic material technological field. The invention uses the carbide slag as the calcareous raw material and adopts the dry process pre-decomposition cement production technology out of kiln. The invention is characterized in that the carbide slag is used to replace the limestone in 100 percent for calcining the cement clinker, and the invention includes: firstly, the preheating and the pre-decomposition of the carbide slag: a cyclone preheater and a calciner system are adopted for the preheating and the pre-decomposition of the carbide slag green stock; the decomposition temperature of the carbide is 380-550 DEG C, and the outlet temperature of the calciner is 550-750 DEG C; secondly, the coal powder burning and the green stock decomposition: the coal powder and the green stock enter the calciner respectively through a distributor; the adding position and the adding amount of wind, materials and coal of the calciner are controlled; the coal powder is burned at the condition of 850 DEG C above; the green stock is decomposed; thirdly, the materials enter a rotary kiln to be calcined into the cememt clinker. The invention has the advantages of resource saving performance, little CO2 emission, low cost, circular economy, etc.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a method in which calcium carbide slag completely replaces limestone to calcinate cement clinker. Background technique [0002] The main component of carbide slag is Ca(OH) 2 , using carbide slag instead of limestone to produce cement clinker is an important way to comprehensively utilize carbide slag. It can not only eliminate environmental pollution, realize the resource treatment of carbide slag, but also effectively reduce the heat consumption of cement production, save limestone resources, and achieve environmental protection. The purpose of energy saving and resource utilization. [0003] At present, the use of calcium carbide slag to produce cement clinker mainly adopts wet kiln and shaft kiln technology. The new dry-process cement production technology has been developed, but at present the mixing ratio of calcium carbide slag is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/36
CPCC04B7/44Y02P40/10C04B7/14C04B7/434
Inventor 俞为民陶从喜彭学平倪祥平曾荣
Owner TIANJIN CEMENT IND DESIGN & RES INST
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