CN103880312A - Light-weight aggregate produced by using coal gangue - Google Patents

Abstract

The invention aims to provide a production method of a light-weight aggregate used for industrial and civil buildings, and in particular relates to the light-weight aggregate produced by using coal gangue. The light-weight aggregate is characterized in that a production raw material of the coal gangue light-weight aggregate is unburned coal gangue; the coal gangue is selected from mining gangue or washing gangue of a coal preparation plant; the particle size range of the coal gangue light-weight aggregate is 0.16-40mm; the coal gangue has a certain heating power, and the caloric value is 1-6276KJ/Kg; the coal gangue is crushed into particles with the particle size of 0.16-40mm, is put into a rotary kiln, and then is subjected to thermal activation at the thermal activation temperature of 650-1250 DEG C.

Description

A kind of light-weight aggregate that utilizes coal gangue to produce

Technical field

The present invention relates to the production method of a kind of industry and covil construction light-weight aggregate, especially a kind of light-weight aggregate that utilizes coal gangue to produce, belongs to Solid Waste Treatment and Resources field.

Background technology

Along with the development of coal production, the output of coal gangue grows with each passing day, more than 100,000,000 ton of newly-increased coal gangue every year, and the coal gangue accumulating has over the years exceeded more than 30 hundred million tons, takes up an area more than 50,000 mu, has formed more than 1500 large-scale waste dump.So a large amount of Coal Solid Wastes not only takies a large amount of soils, and environment is caused to severe contamination, and is a kind of wasting of resources.Carrying out coal gangue and process and recycling, utilize coal gangue manufacture and covil construction light-weight aggregate, is not only that society reduces environmental pollution creation social benefit, can also create certain economic benefit for enterprise.

The production method that current known coal gangue gathers materials is to utilize self-igniting coal gangue to do raw material to produce, and country has worked out product standard (JC/T541-94 People's Republic of China (PRC) building material industry standard).The production method that self-igniting coal gangue gathers materials is taken up an area for reducing self-igniting coal gangue, reduces environmental pollution and has made very large contribution.

In self-igniting coal gangue aggregate production method, weak point is that the coal gangue pozzolanic activity that gathers materials is uncontrollable in coal gangue spontaneous combustion process, active the end of compared with.Due to outside coal gangue hill is exposed to, water content is uncontrollable, and the light-weight aggregate water ratio of making also just cannot ensure.

Do not find at home to utilize at present the industry of nonflammable coal gangue suitability for industrialized production and covil construction light-weight aggregate.

Summary of the invention

The object of the present invention is to provide a kind of production method for industry and covil construction light-weight aggregate, especially a kind of light-weight aggregate that utilizes coal gangue to produce.

A kind of light-weight aggregate that utilizes coal gangue to produce, its feature: coal gangue light-weight aggregate raw materials for production are unburned coal gangue, coal gangue is selected digging cash or coal separating plant's washing cash, coal gangue light-weight aggregate particle size range is 0.16-40mm, coal gangue has certain thermal value, calorific value is 1-6276KJ/Kg, coal gangue original state is crushed to 0.16-40mm and puts into rotary kiln thermal activation, and heat activation temperature is 650-1250 DEG C.

A light-weight aggregate that utilizes coal gangue to produce, is characterized in that having following production method.

Method steps is:

1). selecting thermal value calorific value is 1-6276KJ/Kg coal gangue, removes wherein foreign material, is crushed to 0.16-40mm particle diameter.

2). the coal gangue that is crushed to 0.16-40mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 650-1250 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.

Select unburned coal gangue to produce light-weight aggregate, can manual control light-weight aggregate pozzolanic activity, reduce cement consumption.The light-weight aggregate that unburned coal gangue is produced can substitute sandstone completely, particularly can alternative dry mortar dry sand and replacing asphalt dryly gathers materials, alternative foundry sand has certain positive effect.Another meaning of the alternative sandstone of light-weight aggregate that unburned coal gangue is produced is not only can eliminate coal gangue and takes up an area the environmental pollution bringing, and can also reduce the further destruction that Exploit sand and stone causes physical environment.

In order to understand better the present invention, be further elaborated in conjunction with embodiment below, but content of the present invention is not only confined to embodiment below.

Embodiment 1:

A light-weight aggregate that utilizes coal gangue to produce, raw material is unburned coal gangue, and coal gangue thermal value is 3000KJ/Kg, and particle diameter is 5mm, and spoil is selected digging cash, and activation stove adopts rotary kiln, and activation temperature is 850 DEG C.

A light-weight aggregate that utilizes coal gangue to produce above, its production method step is as follows:

1). selecting thermal value calorific value is 3000KJ/Kg coal gangue, removes wherein foreign material, is crushed to 5mm particle diameter.

2). the coal gangue that is crushed to 5mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 850 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.

Embodiment 2:

A light-weight aggregate that utilizes coal gangue to produce, raw material is unburned coal gangue, and coal gangue thermal value is 6000KJ/Kg, and particle diameter is 12mm, and spoil is selected coal separation cash, and activation stove adopts rotary kiln, and activation temperature is 750 DEG C.

A light-weight aggregate that utilizes coal gangue to produce above, its production method step is as follows:

1). selecting thermal value calorific value is 6000KJ/Kg coal gangue, removes wherein foreign material, is crushed to 12mm particle diameter.

2). the coal gangue that is crushed to 12mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 750 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.

Embodiment 3:

A light-weight aggregate that utilizes coal gangue to produce, raw material is unburned coal gangue, and coal gangue thermal value is 1KJ/Kg, and particle diameter is 0.16mm, and spoil is selected digging cash, and activation stove adopts rotary kiln, and activation temperature is 750 DEG C.

A light-weight aggregate that utilizes coal gangue to produce above, its production method step is as follows:

1). selecting thermal value calorific value is 1KJ/Kg coal gangue, removes wherein foreign material, is crushed to 0.16mm particle diameter.

2). the coal gangue that is crushed to 0.16mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 750 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.

Embodiment 4:

A light-weight aggregate that utilizes coal gangue to produce, raw material is unburned coal gangue, and coal gangue thermal value is 6276KJ/Kg, and particle diameter is 40mm, and spoil is selected coal separation cash, and activation stove adopts rotary kiln, and activation temperature is 750 DEG C.

A light-weight aggregate that utilizes coal gangue to produce above, its production method step is as follows:

1). selecting thermal value calorific value is 6276KJ/Kg coal gangue, removes wherein foreign material, is crushed to 40mm particle diameter.

2). the coal gangue that is crushed to 40mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 750 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.

Claims (2)

1. a light-weight aggregate that utilizes coal gangue to produce, its feature: coal gangue light-weight aggregate raw materials for production are unburned coal gangue, coal gangue is selected digging cash or coal separating plant's washing cash, coal gangue light-weight aggregate particle size range is 0.16-40mm, coal gangue has certain thermal value, calorific value is 1-6276KJ/Kg, coal gangue is crushed to 0.16-40mm and puts into rotary kiln thermal activation, and heat activation temperature is 650-1250 DEG C.

2. according to a kind of light-weight aggregate that utilizes coal gangue to produce described in right 1, its feature: have following production method.

Method steps is:

1). selecting thermal value calorific value is 1-6276KJ/Kg coal gangue, removes wherein foreign material, is crushed to 0.16-40mm particle diameter.

2). the coal gangue that is crushed to 0.16-40mm particle diameter is put into rotary kiln thermal activation, and rotation kiln temperature is controlled at 650-1250 DEG C.

3). in the abundant afterburnt of the combustiblematerials of coal gangue in rotary kiln, then kiln discharge naturally cooling puts in storage, and keeps dry state stand-by.