SU1447776A1 - Method of producing light aggregate - Google Patents

Abstract

The invention relates to the production of building materials and mono. It can be used when burning filler granules in a rotary kiln. To simplify the production technology and improve the working conditions by eliminating dust and piecher as a dusting material, refractory fine powders with an initial moisture content of 10-30% are used, which are compacted at 0.5, 0-10 Pa and fed to the layer of baking granules. with the heating temperature TOO-IOOO C. The method eliminates pipuunos from a rotary kiln, improves the hygienic conditions of production, and simplifies the production technology of expanded clay. 1 ill., 1 tab.

Description

The invention relates to the production of building materials and can be used in the firing of aggregate granules in a rotary kiln with the introduction of dusting additives.

The purpose of the invention is to simplify production technology and to improve working conditions by eliminating dust and foam,. .

In the production of lightweight aggregate by burning granules in a rotary kiln, compacting and supplying the dusting material to the kiln as a dusting material, refractory fine powders with an initial moisture content of 10-30% are used, which are compacted at a specific pressing pressure of 0.5-lO -SjO-10 Pa and served in the layer of baking granules with a heating temperature of 700-1000 ° C.

The drawing shows the scheme of implementation of the method,.

The method is carried out as follows.

Refractory industrial fine wastes from the initial moisture. But 10–30%, for example, the ash of the TPPs of the wet removal or the fine stubs from the dumps, are transported to the claydite workshop and fed to the supply conveyor 1. From the supply conveyor 2, the ashes are fed to the feed bin 3, from which the auger is discharged by teleme 4 by feeding it In device 5, for example, a screw press with a sealing chamber equipped with a cyclic discharger, or a briquetting device, WHERE the dusting material is molded and compacted under a pressure of 0.5-10-3.0 -10 Pa in the form of por11; s 0.5-2.5 liters to strength n shift. Then mechanism 6, for example, a catapult, portions of dusting material are thrown from the side of the hot cut, into the zone of the furnace with the temperature of the bed of burning material 700-1000 ° С,

Examples of the method are presented in the table.

The proposed method makes it possible to use a dusting material with a moisture content of 10-3Q% without preliminary drying, which reduces fuel consumption. There is no need to heat the air, with which dusting material is supplied, which also reduces fuel consumption. No dusting at all

Yu

50

five

30 days

with

0

technological redistribution, including the delivery of material to the plant, its storage and supply to the furnace.

When compacting individual portions of the refractory industrial dispersed waste with an initial moisture content of 10–30%, which is represented by physical water. (Mostly capillary), particles approach each other, resulting in cohesive cohesive forces between them. In the nature of the adhesion forces, it depends on the degree of compaction of the material. When compacted to a shear strength of 10–10 Pa “between particles, long-range adhesion forces (Vap-der-Waals forces) occur, acting through water shells around particles. This allows powdering material to be delivered as individual non-destructive portions exactly into the designated furnace zone with the provision of high quality indicators of the finished product (reduction of the bulk weight of the aggregate). Compaction produces no special binders, which expands using the method and simplifies it.

When moving portions of compacted dusting material. In the furnace, together with the calcined granules under the action of the pressure of vapors and gases imparted at a high temperature inside the batch, as well as shear forces from the pouring layer, the portions of the dusting material are destroyed, scattered and distributed. uniformly in the intergranular space throughout the volume of the firing pellets. At the same time, immediately before the burning zone in the intergranular space of the granulated calcined material, a certain excess of dispersed dusting material is formed, which then, when new surfaces are formed, kills them and, due to the swelling of the granules, prevents them from sintering into conglomerates. The volume of one portion of the dusting material, as well as the number of portions fed into the furnace per unit of time, is determined by a positive method, depending on the physicochemical properties of cf (interval and temperature of expansion) and the properties of the dusting material (refractoriness, dispersion, humidity, etc. ).

With the removal of the zone with the temperature of the layer of material 700-1000 from the hot end of the furnace, the range of flight of the dusting material is increased, and when the zone approaches the hot end of the furnace, it is reduced. Changing the flight range of a piece of material will be carried out by changing its initial speed or changing the angle of its departure.

The use of refractory industrial dispersed wastes as a dusting material with an initial moisture content of 10–30%, in which they are in a natural state, makes it possible to expand the possibilities of using the method through the use of waste thermal power plants, petrochemical plants, and enterprises for the production of refractory and construction materials, waste, development, and crushing of limestone to crushed limestone, waste from slip enrichment of kaolin, etc. This also allows improving sanitary and hygienic conditions duction, improve environmental protection due to the absence dusting and to simplify the process and make it economically feasible due uproscheach handling, transportation and warehousing operations not requiring pypezaschitnyh..meropri - Tille and eliminate pre-drying process and subsequent grinding

Q 5 2 25 gg 76

The proposed method, in comparison with the known method, simplifies the production technology, since the compaction of the dusting material does not require strict adherence to technological parameters, such as during granulation, it is easily implemented in simple mechanisms. In addition, compaction can be carried out in a fraction of a second, and granulation on widely used granulating apparatuses (dish-shaped, drum-type) is long and lasts 3-15 minutes.

Claims (1)

Invention Formula Method for the production of lightweight aggregate by burning pellets in a rotary kiln, compacting and supplying the dusting material to the furnace, characterized in that, in order to simplify production technology and improve working conditions by eliminating dust and heat, refractory fine powders are used as dusting material with an initial moisture content of 10-30%, which are compacted at a specific pressing pressure of 0.5-10-3.0 -10 Pa and fed into the bed of calcined pellets with a heating temperature of 700-1000 °. ten ten thirty specific pressure of pressing, Pa 3.0-10 0.4-10 0.5-10 0.4-10 3.0-10 0.5-10 ten thirty 10 3.0-10 0.5-10 Granulation of dusting powder. Powder granules are introduced into the furnace together with raw aggregate granules. The name of indicators Shear strength of the compacted mass, Pa 5.0-10 0.5 -10 1.0-10 2.0-10 0.8-10 1.2-10 Heating temperature at the supply of compacted mass, broth to the layer of calcined granules, C 700 850 1000 850 850 850 The formation of pypéunos powder in the process of burning of expanded clay in. rotary kiln - - - - ke 0,60 0.61 0,60 0,60 0,60 0,61 -Yes; -Not. Table continuation 150-170 0.60