SU1423523A1 - Raw mixture for producing agglomerated porous material - Google Patents

Abstract

The invention relates to the production of building materials and can be used in the manufacture of agloporite from TPP ash. To increase the strength of agloporite, the raw mix contains, by weight, wt. Z.oloshlakov waste dump 25-45, fly ash 30-60, 10–15 loam and 5-10 agloporite waste. The resulting agloporite fraction of 10-20 mm is characterized by a bulk density of 660-700 kg / m and compressive strength of 4.5-5.0. 3 tab.

Description

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The invention relates to the building materials industry and can be used in the production of agloporite MP-based ashes of thermal power plants.

The purpose of the invention is to increase the strength of agloporite.

The raw material mixture for the production of agloporite contains, in wt%: waste lacquer ash mixture 25-45, fly ash 30-60, loam 10-15, and waste of aggloorite production 5-10.

The chemical and grain composition of the raw materials are presented in table. 1 and 2.

Fly ash is a product of flue gas cleaning of thermal power plants, is formed in ash collecting devices and is disposed of by hydrotransport. The dump ash and slag mixture consists of fly ash and slag, which is deposited in the slag mines of the boiler units, is also removed to the dump by hydrotransport.

Fly ash and waste ash and slag mixture are characterized by similar chemical composition, however, they differ substantially in grain size and phase composition. Fly ash is a fine material. According to the data of particle size analysis, the fraction of more than 0.1 mm in the waste ash-slag mixture reaches 50%, whereas in the waste ash of water removal it is only 17%. According to the petrographic analysis, the water removal ash contains amorphous clay matter and a glass phase. The ash of the dump is represented mainly by vitreous particles.

Waste from the production of agloporite-return consists of spillage of sintering ma-, dust from the aspiration system, as well as sand formed during crushing of the finished product.

Example. Fly ash removed from a thermal power plant is dried and dehydrated on filters to a moisture content of 16–20%. The ash cake obtained as a result of filtration is mixed with a waste ash-slag mixture, loam, agloporite-return production waste and granulated. Raw granules are burned on the sintering machine grates. The ignition temperature of the upper layer of the charge is 1000-1100 ° C. The vacuum under the grate during ignition support

within 1200-1400 Pa. and in the period of agglomeration - 2000-3000 Pa.

The resulting agloporite is tested for compressive strength in the cylinder.

The composition of the raw material mixtures and indicators of the properties of the resulting agloporite are presented in table. 3

The resulting agloporite fraction of 10-20 mm is characterized by a bulk density of 660-700 kg / m, with the strength of agloporite increasing to 4.5-5.0 MPa.

The joint use of waste products of agloporite-return and an ash-slag waste mix, which, being the germinal centers of the granulation process, form the skeleton of the granule, contributes to the formation of high-quality raw granules of a uniform grain composition, represented by a fraction of 10–20 mm. In the process of heat treatment on an agglomeration machine, the formation of the structure of individual granules, with such size, is ahead of time in their contact sintering among themselves.

Raw granules obtained from the proposed mixture provide improved gas dynamic agglomeration mode, increasing the yield of the product and its strength. Thus, in a layer of granules of a fraction of 10–20 mm, obtained from a mixture, the relative rate of gas filtration at a dilution of 3000 Pa reaches 1.45 m / s, which increases the yield of the suitable product to 0.9–0.95 and contributes to an increase in its strength. to 4.5–5.0 MPa.

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Claims (1)

Invention Formula 5 A raw material mixture for the production of agloporite, including ash, loam and production waste, characterized in that, in order to increase the strength of agloporite, it contains ashes dump waste ash and slag mixture and ash removal fluid, as waste production - agloporite waste during the following ratio of components, wt.%: Ash dump mix 5 Fly ash Loam Agloporit waste production t a b l and t a 25-45 30-60 iO-15 table 2 Agloporite production waste - return 35.3 60 45 25 35 10 12.5 5 7.5 2, 0 2.2 700 800 300 300 660 680 4, 5 75 0, 9 0.92 15.1 49,6 Table 3 thirty 72.5 45 15 20 20 ten 7.5 72.5 7.5 2.5 1.0 600 300 300 700 700 440 5.0 2.5 0.95 0.85 one,