RU1807027C - Method for alumophosphate binder production - Google Patents

Abstract

The invention relates to metallurgy and allows to reduce energy consumption and corrosion activity, as well as reduce the cost of a binder. A method for producing an aluminophosphate binder consists in the fact that, first, an aluminum-containing component, which uses a water-soluble alkyl chloride-based alkylation waste, is mixed with the waste foundry - waste solution of alkali containing, g / l: ISO-200 NaOH, 210-250 No. g5U2 in a ratio of 1: 1.2-1.5, then the resulting product of plastic consistency is isolated and mixed it with an aqueous solution of phosphoric acid to a ratio of ABO3. PrgOb equal to 1: 1.3-1.8. Corrosion activity of the binder is 1.3-2.2%, the lining strength after drying at 700 ° C is 4.26-4.73 MPa, and the lining resistance is 23-24 melts. 2 tab. have fe

Description

The invention relates to metallurgy, in particular to the production of binders for refractory materials used in the lining of metallurgical thermal units.

 The purpose of the invention is to reduce energy consumption and corrosion activity.

The essence of the method of producing aluminophosphate binder is as follows.

The aluminum-containing component - alkylation wastes, which are aqueous solutions of aluminum chloride, are mixed with a water-soluble component, which is used as an alkaline waste of castings containing caustic sodium and sodium silicate in a ratio of 0.8-1.2: 1. This forms a reaction mass from which a plastic consistency product is isolated. An aqueous solution of phosphoric acid is added to the latter in terms of the ratio A120.z: P20b as 1: 1.3-1.8 and a binder with a density of 1510-1520 kg / cm3 is obtained.

The product of plastic consistency resulting from the interaction of alkylation wastes and alkaline waste from castings contains alumina hydrate A1 (OH) 3 and aluminosilicate of the composition x x 3S102. The product is formed by particles of a small fraction, has a phase contact surface, which provides high reactivity, reduces the reaction time and eliminates the need for heating the reaction mixture.

An example of the method, 200 g of alkylation waste with a density of 1330 kg / m3 are mixed with 260 g of alkaline waste of castings with a density of 1320 kg / m3. Mixing is carried out in

With

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for 14 minutes at room temperature (15-25 ° C). A plastic consistency product is separated from the resulting reaction mass. To a plastic product in an amount of 160 g and a moisture content of 62 wt.%, 180 g of a 50% aqueous phosphoric acid solution are added and stirred for 26 minutes, while the reaction temperature is 60 ° C. The resulting colloidal solution has a density of 1520 kg / m3.

The resulting binder in the amount of $ 5 wt.% Is added to the hours of Roversky sand grade PO 16 GOST 2138-84 with a moisture content of 2.5 wt.%. A lining of a casting ladle with a capacity of 100 kg is made from the obtained lining mass in a known manner, for example, by manual ramming.

Table 8 shows the technological parameters of the process of producing a binder according to the prototype method and the proposed method, table 2 shows the properties of linings with binders prepared according to the prototype method and the claimed method.

From table 1 it is seen that to obtain a binder according to the proposed method does not require additional energy consumption for firing, and the preparation time is reduced by 2-2.3 times.

It can be seen from Table 2 that binders prepared by the claimed method have lower and corrosive activity. In the range of the ratio A1203: P205 1: 1.3-1.8, their corrosion activity is 1.3-2.2%. This is explained by the minimum content.

0

5

0

5

0

5

free phosphoric acid in binders due to a more complete interaction of phosphoric acid with the miscible component,

It can also be seen from the data in Table 2 that linings containing binders prepared according to experiments 2-4 have the best operational properties. The strength of these linings reaches 4.26-4.73 MPa, the resistance of 23-24 melts, and the porosity decreases to 22.6%. These properties are lining | with binders prepared according to experiments 2-4, in which the ratio of alkylation wastes and alkaline cleaning of castings is 1: 1.2-1.5, and the ratio A120z: P20b-1: 1.3-1.8. Outrageous component ratios (tests 1 and 5) slightly decrease the lining performance. Formula a is bounded and A method for producing an aluminophosphate binder comprising mixing an alumina component with phosphoric acid, characterized in that, in order to reduce energy consumption and corrosion activity, the alumina component is first used as a water-soluble alkylation waste on based on aluminum chloride, mixed with foundry waste - spent alkali solution containing, g / l: NaOH 150-200, N328102 210-250, in a ratio of 1: 1.2-1.5, then the resulting plastic product is isolated oh consistency and mixed with an aqueous solution of phosphoric acid to 20z ratios A: P205 ratio of 1: 1.3-1.8.

Table 1

Note. The charge for elkylated waste for all cases is 1330 kg / m, the density of alkaline waste for casting is 1320 kg / m3 with a NaOHiNajSlOa ratio of 1: 1 by weight.

table 2