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Method and system for preparing active coal gangue

A coal gangue and limestone technology, applied in the field of activated coal gangue preparation in the new dry cement production process, can solve the problems that the continuous production of calcined coal gangue cannot be guaranteed, achieve stable and reliable sources, and improve production efficiency

Active Publication Date: 2009-06-17
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

Therefore, calcining coal gangue with the flue gas formed by bypass ventilation as a heat source cannot guarantee the continuous production of calcined coal gangue
In addition, the active coal gangue calcination method does not involve calcium-increasing calcination, so for coal gangue with low kaolinite content, the pozzolanic activity of the calcined gangue obtained needs to be further improved

Method used

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  • Method and system for preparing active coal gangue
  • Method and system for preparing active coal gangue
  • Method and system for preparing active coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment one: the preparation of active coal gangue

[0053] The 80μm sieve residues of coal gangue and limestone were 13.9% and 11.5% respectively, and the mass fractions of particles smaller than 30μm were 67% and 74% respectively.

[0054] Introduce hot air with a temperature of about 900°C from the cooler of the new dry process kiln system, and feed coal in four batches according to the ratio of gangue to limestone: 100:0, 90:10, 70:30, and 50:50. Gangue calcination system, the activated powder obtained by preheating the preheating cyclone, calcining in the calcination furnace, and cooling step by step from the first to the third cyclone, respectively marked as A-1, A-2, A-3, A -4.

[0055] Wherein, the temperature of the material at the outlet of the preheating cyclone 3 is controlled to be about 400° C., and the temperature of the gas at the outlet is about 500° C. The outlet material temperature of coal gangue calciner 1 is about 850°C, and the outlet gas tem...

Embodiment 2

[0064] Example 2: Preparation of active coal gangue by circulating heat source

[0065] On the basis of Example 1, the waste gas from the calcination system was treated. The exhaust gas discharged from the preheating cyclone 3 has a higher temperature and a higher dust content, and the direct discharge not only wastes heat but also pollutes the environment. In order to make full use of this part of the heat, part of it is led back to the ascending pipe 23 through a pipe with an air flow valve, and the introduced waste gas is mixed with the gas from the first-stage cyclone to preheat the material together. In the embodiment, 50% of the high-temperature exhaust gas discharged from the waste gas channel 31 of the preheating cyclone 3 is led back to the pipeline 23. Although the air volume of the cyclone 3 is increased, the temperature of the outlet gas has little effect. After testing, the preheating cyclone 3 The outlet gas temperature is about 490°C. The temperature of the ex...

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Abstract

The invention relates to a method and a system for preparing activated coal gangue, and belongs to the field of the cement industry. A coal gangue material is calcined in a heat source, and then the activated coal gangue is obtained by cooling and discharging the calcined coal gangue material by a multistage cyclone, wherein the heat source is high-temperature flue gas continuously discharged during cement production, then the high-temperature airflow is introduced into a calcination furnace to make the preheated coal gangue material calcined in a powder suspension state. The method makes full use of the stable heat source to quickly preheat and calcine the coal gangue and fully decompose limestone at the same time to achieve the aim of increasing calcium activity, forms the high pozzolanicity coal gangue with stable heat source supply, low cost, high production efficiency of the activated coal gangue and high utilization rate of the heat source, can remarkably improves pozzolanicity of the coal gangue, and provide a novel solving means for comprehensive utilization of industrial waste residue.

Description

technical field [0001] The invention belongs to the field of cement industry, and relates to a preparation process of activated coal gangue, in particular to a preparation method and system of activated coal gangue combined with a new dry production process of cement with a precalciner. Background technique [0002] The new dry production process has become the most advanced cement production process in the world, especially the new dry production process with a calciner (out-of-kiln calcination kiln process) has become a technological milestone in the cement industry due to its low heat consumption and high efficiency breakthrough. Since the first out-of-kiln decomposition kiln was built and put into operation in 1971, its related technology has made great progress. At present, the production capacity of the largest out-of-kiln decomposing kiln has reached 10,000 tons of clinker per day. In my country, the new dry production process has developed rapidly, and the proporti...

Claims

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Application Information

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IPC IPC(8): C04B20/04C04B18/12
CPCY02W30/91
Inventor 张文生叶家元王宏霞汪智勇唐润荣董刚
Owner CHINA BUILDING MATERIALS ACAD
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