SU1069930A1 - Mix for preparing fountain - Google Patents

Abstract

MIXTURE FOR PREPARATION OF CENTERS, containing filler, gypsum and binder, characterized in that, in order to increase the flowability of the mixture, improve its knockout and control technology of its preparation, it additionally contains a waste from etching metal products with sulfuric acid, while the filler is used burned earth, and as a binder - liquid glass in the following ratio of ingredients, wt.%: The ground burned 75 85-Gypsum flooding 0.5-1.5, Waste from etching metal products sulfuric to Slots density 1,12-1,22 g / sm i 4-50,5-6,5 solution with pH of the liquid (L glass density 1,04-1,1 g / smZ14,0-17,0

Description

ABOUT

with so

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The invention relates to steel. smelting, in particular for self-hardening self-hardening mixtures for the preparation of centrifugal siphon steel.

Known refractory mixture C13, including, wt.%:

Quartz sand 77.44 Aqueous solution of sodium bichromate 1.26 with a density of 1.451, 50 g / cm Sulphite-yeast brew (SDB (density 1.11-1.14 g / cm3 21.30.

The preparation of a known mixture consists in mixing the ingredients taken in the required quantities, in which case the mixture is first mixed with an aqueous solution of xpo 1 peak, and then the resulting mass is mixed with the DMR.

The disadvantages of this mixture include toxicity (;; their components (sodium bichromate and RRM), low fluidity of the mixture, difficulty in dismounting the sprue due to the increased strength of the mixture after heating to lining temperatures of 600–800 ° C and difficulty in preparing the mixture.

The closest to the proposed technical essence and the result is the filling mixture for the application of the refractory lining mainly ladle casting chutes, centering, including May.%:

Quartz sand 63-95

Water 3-18

Semi-aquatic gypsum1-10

Polyvinylacetate

dispersion density

1.03-1.2 g / cm3-12

The method of preparation of the support mixture is as follows.

First, rf sand is metered in predetermined amounts, mixed for 3-5 minutes until a homogeneous composition, then a polyvinyl acetate dispersion of a given density is poured in and driven. Stirring time takes 4-5 minutes. The density of the polyvinyl acetate dispersion of 1.03-1.2 g / cm is selected for reasons of stability and stability during storage.

The disadvantages of the known support mixture are the difficult knockout of the sprue due to the increase in its strength after operating temperatures of the lining center 0 - 800 ° C, multi-operability of mixture preparation, low flowability, which makes it difficult to obtain

solidity of the lining and leads to breakthroughs of the metal through the center lining, as well as in the non-technological method of preparing the polyvinyl acetate dispersion.

The purpose of the invention is to increase the fluidity of the mixture, improve its knockability, and simplify the technology of its preparation.

This goal is achieved by the fact that the mixture containing filler, gypsum and binder, additionally contains a waste from etching metal products with sulfuric acid, while earth is used as a filler, and liquid glass is used as a bond, .%:

Burned Zail - Foundry production waste75-85

Semi-aquatic gypsum. 0.5-1,

Production waste from the etching of metal products with sulfuric acid with a density of 1.12-1.22 g / cm 0.5-6, | with a pH of 4.5

Liquid glass with a density of 1.0-4-1, L g / cm 14.0-17. The method of pre-ming the mixture is as follows.

All ingredients of the mixture are introduced into the mixer in sequence and mixed for 1.5-2 minutes. After that, the mixture is ready for use. Such a method makes it possible to shorten the time of stirring the mixture and prolong the time of the fluid state of the mixture (survivability.

Burned earth is a light brown bulk material with a bulk weight of 1.4-1.6 g / cm is a foundry waste, formed during the destruction and cleaning of casting molds and cores with the following chemical composition, wt.% 5iO2 to 85 , up to 12%, iron oxides else. In addition to the burned earth, various types of sand, waste slag and other materials can be applied inertly to liquid glass.

Gypsum construction GOST 125-70 of any BiyioTb grades to non-standard.

The used waste from etching metal products with sulfuric acid is a brown liquid with a density of 1.12 1, 22 g / cm pH 4-5, contains 200 500 g / l of iron and a corrosion inhibitor JtOCn-10 corresponding to TU-6-02 -727-74, in the amount of 0.5 g / l, which gives the waste properties of a good surface-active agent. Liquid glass solution is dense-. Tew 1.04-1.1 g / cm table. 1 shows the compositions of the proposed and known mixtures. . Table 2 shows the mechanical properties of the proposed n. lime x mixtures.

Removal from etching Metal products with sulfuric acid with a density of 1.12 1, 22 4-5

I

Liquid glass with a density of 1.04-1.1 g / cm

Quartz sand, sodium bichromate

Sulfite yeast brew Polyvinyl acetate

Compressive strength, kg / cm upon completion of the coverage and after heating to

With temperatures.

0.4 1.4 0.8 0.5 O

3.5

0.5 15.5 14.0

75.6

77.44 1.26

21.3

Table 2

1 5 O O 1.6

2 10

0.2

1.1.

5 0.6

O 2.9 0.5 O

Beatability of the mixture, J, after heating to temperatures, C

Continued table. 2

Claims (1)

2. The certificate of authorship of the USSR In 900927, cl. 22 C 1/14, 1981. (541 MIX FOR CENTRAL PREPARATION, containing filler, gypsum and a binder, characterized in that, in order to increase the fluidity of the mixture, improve its curing and simplify the technology of its preparation, it additionally contains waste from etching metal products with sulfuric acid, while burned earth is used as a filler, and liquid glass is used as a binder in the following ratio of ingredients, wt.%: Burned Earth 75-85 -Gypsum semi-aquatic 0.5-1.5, Waste from etching metal products with sulfuric acid with a density of 1.12-1.22 g / cm ⁵ with PH 4-5 0.5-6.5 A solution of water glass with a density of 1.04-1.1 g / cm ³ 14.0-17.0