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Calcinion method for calcining coal gangue to produce cement additive

A technology for cement admixture and coal gangue, which is applied in the chemical industry, can solve the problems of reducing cement manufacturing cost, large investment and high transportation cost, and achieves the effects of low cost, convenient transportation and lower cement cost.

Inactive Publication Date: 2011-09-07
CHIBI CITY MOYU CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a calcination method for producing cement admixture by calcination of coal gangue, which solves the problems that the existing coal gangue calcination method needs to build a fixed kiln, large investment and high transportation cost, thereby reducing the manufacturing cost of cement

Method used

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Embodiment Construction

[0021] The calcination method for producing cement admixture by calcination of coal gangue described in the embodiment of the present invention comprises the following steps:

[0022] 1) For the preparation of the calcination site and the ventilation pipeline, select a relatively easy-to-transport flat ground in the site where coal gangue is piled up, and select a steel pipe with a diameter of 15-18cm and a wall thickness of 1.5-2cm for the ventilation pipeline. There are air outlets with a width of 1cm, and the distance between the two air outlets is half the diameter of the ventilation duct.

[0023] 2) For the laying of ventilation pipes and combustion layers, lay the air outlet of the prepared ventilation pipe upwards in the shape of a "ten" in a compact manner. The cross joints between the pipes are interconnected, and blowers are placed at the ends of each ventilation pipe. The laying area is 20-50 square meters m, lay a 10-15cm thick economical, easy-to-obtain, and easy...

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Abstract

The invention relates to a calcinion method for calcining coal gangue to produce a cement additive. The method comprises the following steps of: selecting a convenient-to-transport flat area in a place with stacked coal gangue; laying a ventilation pipe, a combustion layer and a coal layer with the thickness of 9 to 11 cm in sequence; igniting the combustion layer and stacking coal gangue; and continuously blowing air through the pipe to support the combustion of coal gangue for 6 to 7 days, and naturally cooling to obtain a sintered material which can be used as a cement additive. The invention has the benefits that: the coal gangue is fully utilized and 1.9 tons of cement additive is produced per 2 tons of coal gangue; the addition amount of the cement additive is 3 to 4 times that of the basalt, so that the cement cost is greatly reduced; the cement grade of the additive is about 250#, the addition amount in cement is increased and reaches 25% for ordinary cement and 30% to 40% for pozzolanic cement; owing to the natural cooling process, the sintered material is fragile and easy to mill; and the blower has a high blowing capacity, the coal gangue has a large combustion value, and the coal gangue on the surface of the coal gangue stack combusts completely.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a calcination method for producing cement admixture by calcination of coal gangue. Background technique [0002] Coal gangue is industrial solid waste discharged during coal mining in the coal industry (generally about 0.2 tons of gangue is discharged per ton of coal mined), and coal gangue discharged over the years in various coal mines and surrounding areas has piled up like mountains, and continues to be discharged year by year, occupying land and pollute the environment. For a long time, the comprehensive utilization of coal gangue has been one of the key research and development topics in the coal and building materials industries. At present, some coal gangue with a certain calorific value is used for brick making and power generation, and natural coal gangue is used as cement admixture, etc. Compared with the output speed of coal gangue, its utilization is still very low,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/14
CPCY02P40/10
Inventor 袁社红龚益淮
Owner CHIBI CITY MOYU CEMENT
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