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Technological process for producing cement clinker by dry burning carbide slag

A technology of cement clinker and process method, which is applied in the direction of cement production, etc., which can solve the problems of low thermal efficiency, serious system return, affecting the stable calcination of rotary kiln, etc., and achieve the effect of high thermal efficiency and stable system operation

Inactive Publication Date: 2009-07-08
HEFEI CEMENT RES DESIGN INST
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Problems solved by technology

[0003] (1) The preheating and pre-decomposing functions of the preheater and calciner are not played, and the apparent decomposition rate of calcium carbide slag raw meal cannot reach 90%. Therefore, the size and length of the kiln need to be appropriately enlarged, and the thermal efficiency is low.
[0004] (2) The pulverized coal and raw meal enter the eruption-type calciner for upper and lower distribution through the feeder. The process is complicated and it is difficult to operate in actual production.
[0005] (3) The batching is used twice, and the batching is difficult to be accurate, which affects the stable calcination of the rotary kiln; the dust collector at the end of the kiln is seriously corroded, with high failure rate and low operation rate
The system returns serious material and the production is unstable

Method used

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  • Technological process for producing cement clinker by dry burning carbide slag

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Embodiment Construction

[0013] Referring to the accompanying drawings, the mixture of calcium carbide slag and auxiliary materials after drying and grinding is used as the raw meal, which is heated and decomposed step by step by the five-stage cyclone, and the raw meal first enters the ascending pipe at the upper part of the second-stage cyclone 2 The first heat exchange occurs when the inside and the hot air flow meet and merge, and enter the primary cyclone 1 for the first separation of gas and material. The ascending pipe entering the upper part of the third-stage cyclone 3 meets the hot air flow for the second heat exchange and enters the second-stage cyclone 2 for the second gas-material separation. The feeding pipe at the bottom of the cyclone 2 then enters the ascending pipe at the top of the fourth-stage cyclone 4, meets and merges with the hot air flow for the third heat exchange and enters the third-stage cyclone 3 for the third gas-material separation, and the third gas-material separation....

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Abstract

The invention discloses a process method for manufacturing cement clinker through dry combustion of carbide slag. A mixture of the carbide slag subjected to drying and pulverizing treatment and an auxiliary material is used as a green stock and is gradually pyrolyzed by a five-stage cyclone preheater, wherein hot wind at a temperature of between 500 and 600 DEG C is supplied in a second-stage or a third-stage cyclone preheater to complete the decomposition of Ca(OH)2 into CaO; the green stock discharged from a discharge pipe of a fourth-stage cyclone preheater enters a decomposing furnace; the decomposing furnace is connected with a wind port for dispersing and rotating the green stock; the green stock and airflow burning in the decomposing furnace at a temperature of between 900 and 1,000 DEG C are fully mixed; the temperature of the green stock is further improved in order to gradually decompose a carbonate composition; and finally the green stock enters a rotary kiln and is calcined to form the cement clinker. By the method, the decomposition rate of the green stock of the carbide slag reaches between 90 and 95 percent; the specification and the length of the rotary kiln are not needed to amplify; thermal efficiency is high; and the system has stable operation.

Description

technical field [0001] The invention relates to a process for dry-burning cement clinker with calcium carbide slag. Background technique [0002] The invention patent with the patent number CN200610146907.4 provides 100% replacement of natural limestone raw materials with carbide slag to produce cement clinker by kiln decomposition; Process method for producing cement clinker; the invention patent with the patent number of CN200710150669.9 provides a method of calcining cement with carbide slag completely replacing limestone, which is characterized in that the secondary or tertiary cyclone preheater plus "high temperature calcination, medium temperature decomposition" decomposition Furnace processing carbide slag method, this method has the following disadvantages: [0003] (1) The preheating and pre-decomposing functions of the preheater and calciner are not brought into play, and the apparent decomposition rate of calcium carbide slag raw meal cannot reach 90%. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147
CPCY02P40/10
Inventor 卫耕唐根华包先法马林崔冬梅
Owner HEFEI CEMENT RES DESIGN INST
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