SU1009604A1 - Self-hardening mixture - Google Patents

Abstract

SELF-CONTAINING MIXTURE for the manufacture of casting molds, including quartz sand, orthophosphoric acid and material based on iron oxides, which, in order to increase the heat storage capacity and reduce the consumption of quartz sand, as a material based on iron oxides, it contains a wet cleaning product gases-cupola burning in the following ratio of ingredients, wt.%, product of wet cleaning of cupola-shaped gases-vag vachna gary40-50 Orthophosphoric acid6-8: Quartz sandOther (L

Description

O) The invention ornosti to the foundry, namely, the plastic fortress training self-hardening mixtures used in the manufacture of castings in one-off forms. The compositions of plastic self-hardening mixtures used to make casting molds and cores 1 are known. A combination of iron oxides with phosphoric acid is used as a binder in this mixture. Such a molding mixture makes it possible to obtain fogms with pressing and technological and physical properties. The disadvantage of this mixture is the use of expensive bonding materials and the high content of fresh molding materials, in particular quartz sand. The known molding mixture, which is prepared on the basis of quartz sand, includes orthophosphoric acid and FeO as a binder. During the interaction of HPRO and FeO, iron phosphates are formed, which possess high binding capacity and heat resistance; The molds obtained on the basis of the compositions have good mechanical properties and produce high quality castings. However, the high activity of FeO largely determines the low survivability of wood. In addition, this molding mixture requires a large amount (up to 90%) of fresh quartz sand. Closest to the invention to the technical essence, and the achieved effect is a self-hardening mixture for making foundries in the rods, including quartz, 1st sand, ortho-phosphorus acid, and as an iron-containing material metallurgical dust СЗ. However, this mixture provides insufficient heat storage capacity, as a result of which tightness and density of castings are not always achieved. The aim of the invention is to increase the heat storage capacity and reduce the consumption of hard disk glass. To achieve this goal, a self-hardening mixture for the manufacture of casting molds, including quartz sand, orthophosphoric acid and material based on iron oxides, as a material based on iron oxides, contains a product of wet cleaning of cupola gases cupola cup in the following ratio of ingredients, wt.%:. The product of wet cleaning of cupola-shaped gases is cupola 40–40–50. Orthophosphoric acid6–8 Quartz sandThe remaining cinderwood has the following composition, in wt%: 8 The dispersion of the cupola burner is as follows: 45–7O% of the burning beans remain on the OD-O stages, 16. The surface area of the avna is 1400–2600. The product of wet cleaning of the cupola elements does not twitch pretreatment and is used after extraction from the gas cleaning system and drying to 0 enough moisture. , 5-1%. Molding mixture prepared by peemeshivan and the ORIGINAL molding materials in a roller-type mixer for 5 minutes, followed by the introduction of orthophosphoric acid and stirring for S minutes The invention is illustrated by the compositions and properties that are listed respectively in Tables 1 and 2. Table

Phosphoric acid

Metallurgical dust | one

9

ten

eight

ten

The composition of the mixtures, respectively Vitality, h 1.2-1.4O, 9-1.1 Compressive strength, kgf / cm2 0.15-0.270.15-O, ZO Compressive strength, after 1 h, kgf / cm2 1.0 -1.21.0-1.6

Gaeoproni 180-25О 18Ог25О 180-250 180-25О tseimost, units

0,2-О, 8 О, 2-Ю, 8 0,2-О, 8 36-4541-56 41-56

The proposed mixture has good knockability and, when used, is not burned. As follows from tible. 1, 2, a change in the content of a nickname of 6% leads to a decrease in the strength properties of the ampoules & and reduce the survivability of the mixture.

A decrease in the content of the cupola burning shock of 40% leads to a decrease in the following: sanitized properties of the forms, and an increase above 5O% leads to a deterioration in the beating of the mixture.

Optimal, from the point of view of the technological properties of the forms, is

 b li c a 2

180-25О1ОО-50О О, 2-О, 8 0.5-1.0

419-58 25-ZO

tav containing cupola 40-5O% and orthophosphoric acid 6-8%.

The proposed molding mixture allows increasing the heat storage capacity of the molds to reduce the consumption of quartz sand, and reduce the amount of waste generated in foundries.

The economic effect from the use of a molding mixture in the context of the Lipetsk plant. The centrolite will be 253 thousand rubles a year.

The inventive molding mixture is at the stage of development of the industrial version of its use. It is planned to implement the claimed composition by introducing the Centrelt Diesel Agency in 1983 with 0.6-O, 9 O, 6-0.7 O, 4-O, 6 O, 2 O-O, 25. O, 15-0, ZOO, 2O-O, 40 O, 2-O, 4O 2.0-2.5 2.5-3.2 2.3-2.8 1-5

Claims (1)

(54) A SELF-CURING MIXTURE for the manufacture of foundry molds, including quartz sand, phosphoric acid and material based on iron oxides, characterized in that, in order to increase the heat storage ability and reduce consumption of quartz sand, it contains a product as the material based on iron oxides wet cleaning cupola gases cupola fuels in the following ratio of ingredients, wt.%, Product of wet cleaning of cupola gases - cupola cinder 40-50 Phosphoric acid 6-8 o: Quartz sand The rest .SU, „1009604