SU1380843A1 - Sand for making moulds - Google Patents

Abstract

The invention relates to foundry production, in particular, to molding sand-bentonite mixtures used in the manufacture of steel, cast iron and non-ferrous casting in molds obtained raw. The purpose of the invention is to improve the quality of the forms by improving the flowability and moldability of the mixture. This goal is achieved due to the fact that the composition of the mixture contains spent phosphate-containing detergent solutions, which are waste from the mechanical assembly production, and spent solutions for extracting residues of ceramic molds in an amount of 0.1-0.6 wt.% In the following ratio ingredients, wt.%: bentonite 6-15; waste washing solutions 0.1-0.6; spent alkaline solutions 0.1-0.6; water 2.5-5.5; quartz sand else. The mixture with the said spent solutions is characterized by better flowability and formability. 2 hp f-ly. 2 tab. 9 (L

Description

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The invention relates to foundry production, in particular, to molding sand-concrete mixtures used for making steel cast iron and non-ferrous castings, mainly in raw materials.

The purpose of the invention is to improve the quality of the forms by improving the flowability and formability of the mixture.

Any type of bentonite can be used to prepare molding compounds, but the greatest effect is achieved when using calcium-magnesium bentonite with a large exchange capacity. As a refractory filler, you can use quartz, zircon and other sands, as well as regenerate or working mixtures

based on them. It is advisable to set the maximum quantities of bentonite when using adjacent sands and the minimum - when combining fresh sands with recycled mixture, the more the reverse mixture is contained, the less bentonite is added. based on the actual loss of the working mixture. Water should be introduced into the moldable mixture, taking into account its content in the spent solutions. The spent phosphate-containing detergent solutions are the waste of the mechanical assembly production, and the spent leaching solutions of the residue of ceramic molds are cast on the produced models, the waste products of the exact cast on the produced models.

Spent cleaning solutions of mechanical assembly production have the following composition, wt.X:

Calcium

soda5.0-7.5

Trnpolyphosphate

sodium 2.0-4.5

Sodium metasilicate 2, 0-3,0 Surfactant 0.2-1.5 Water Else The spent solutions of alkalisation of the residue of ceramic forms are cast on the basis of the models, the following composition, wt%: Sodium metasilicate 10-16

five

0 5 0 h Q

with

0

Caustic

soda6-12

Soda ash 0.5-1.5 Leagues for sulfonates, technical 8-12 WaterExtra

To use these solutions, it is necessary to dilute them with an equivalent amount of water and add technical lignosulfonates according to GOST 13-193-83 as a stabilizing additive in the amount of 10 May.7, diluted spent extracting solutions. The resulting solution with a density of 1.19-1.22 g / cm is stable at a temperature not lower than 20 ° C and is suitable for use in the composition of the molding mixture.

Used phosphate-containing detergent solutions of mechanical assembly production are formed as a result of using for cleaning parts different concentrations of aqueous solutions of phosphate-containing detergents of the type Labomid-101, Labomid-102, Labomid-203, Labomid-204, differing mainly in the type of surface applied. - an active substance, which can be used as a syntanol DT-7, synthanol DS-10, sodium alkyl sulfates, primary wetting agent DB, sulfonol, oxyphos B, and others.

Waste solutions are added to the moldable mixture in terms of dry residue.

The optimum content of waste solutions in the composition of the molding mixture is 0.1-0.6 wt. Mixtures can be prepared using bentonite, either as a powder or as a suspension. Used solutions can be dispensed either alone or with water. Any known technological additives can be added to the mixture: carbon-containing, starch-containing, structure-forming (asbestos, sawdust, etc.), additional binders (KO or IVF fixers, etc.), surfactants (DS-PAC, PFLH, etc.) and others.

I

The compositions and properties of the proposed And known mixtures are given in Tables 1 and 2. The content of waste solutions is everywhere given in terms of dry residue.

From Table 2 it can be seen that mixtures using waste solutions are characterized by better fluidity and formability.

Thus, mixtures of this composition expand the capabilities of engineering enterprises to improve the quality of casting at the expense of their own reserves by creating waste-free technology while at the same time solving serious environmental protection problems.

Claims (3)

Invention Formula I. Mixture for the manufacture of casting molds, obtained by molding in crude, including a refractory filler, bentonite, a sodium-containing adjuvant and water, characterized in that, in order to improve the quality of the forms by improving the flowability and formability of the mixture, as a sodium-containing activating additive the mixture contains spent phosphate-containing detergent solutions of the mechanical assembly production or spent solutions to target the residue of ceramic forms cast by melted models in the following ratio and ingredients, wt%: Bentonite Spent phosphate-containing detergent solutions of mechanical assembly production or 0 five 0 5 0 five 0 The rest is different for processing solutions of aiming the remains of ceramic molds to be cast according to melted models (in terms of dry residue) 0.1-0.6 Water2.5-5.5 Refractory filler 2. The mixture according to claim 1 This is because the spent phosphate-containing detergent solutions of the mechanical assembly production have the following composition, in wt%: Calcined soda 5.0-7.5 Tripolyphosphate sodium 2.0-4.5 Sodium metasilicate 2.0-3.0 Surfactant 0.2-1.5 Water Else 3. A mixture of POP.1, characterized in that the spent leaching solutions of the residue of the ceramic mold casting on the melted models have the following composition, wt.%: Metasilicate on three Caustic soda Cal kiniry Anna Soda 10-16 6-12 Technical lignosulfonates Water 0.5-1.5 8-12 Else Ingredients Bentonite Spent cleaning solutions 0.1 0.4 Spent alkaline solutions Water 2.5 3.5 Spreadsheets ten 15 ten 15 0.6 0.1 0.4 0.6 5.5 2.5 3.5 5.5 The turnover mixture Quartz sand Regenerate 91, 4 Indicators : IL: TE: IZI Compressive strength in wet state, kgf / cm 0.56 1.35 1.72 0.58 1.39 1.78 Strength in the zone of moisture condensation, g Beatability (residual strength after heating) kgf / cm Fluidity,% Formability, 7 Dropsiness,% 14.0 32.5 36.0 12.5 29.0 33.0 Continued tabi, 1 86, 91.4 78.9 - 78.9 86.1 Table 2 The compositions