RU2300459C1 - Article of slag producing method - Google Patents

Abstract

FIELD: foundry, namely manufacture of different products of slag, for example tubes, acid-resistant fittings, paving blocks, electrical-engineering insulators, building articles (boards, blocks, tiles, stair flights and so on) braking shoes, railway road sleepers and weights.

SUBSTANCE: method for making articles of slag comprises steps of producing liquid slag; filling with it working cavities of forms; soaking slag in forms for cooling it and then removing cooled article out of forms. At first batch of heated slag is poured into specially used squeezing chamber. Then slag from said chamber is displaced to working cavity of form by action of mechanical pressure. Slag is displaced to form at temperature lower than "solidus" point, mainly at 800-900°C. Polysterene-foam gasifiable patterns are used for shaping articles. Single articles are reinforced with non-compact material such as metal cuttings or quartz sand.

EFFECT: improved efficiency of article production, lowered cost price of articles, possibility for recovering blast furnace slag, enlarged assortment of products.

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Description

The invention relates to the field of foundry and can be used in the manufacture of various products from slag, including pipes, acid-resistant fittings, pavers for bridge, electrical insulators, building products (blocks, plates, window sills, staircases, tiles, roof tiles, etc.), road curbs, brake shoes, railway sleepers and cargo, sculptures, etc.

Known slag casting, which consists in obtaining a molten slag, then pouring the melt into a mold, holding the molten melt for crystallization and then removing the cooled product from the mold (V.N. Ivanov. Dictionary-reference book on foundry. Moscow: Engineering. 1990 g, p. 100).

The disadvantages of this method are:

- in the long exposure of slag poured into the mold (pouring temperature 1200 ° C, holding the product in the form of several tens of hours), low productivity, the use of a large number of production areas;

- the limitation of technological capabilities in terms of reinforcing products with non-compact materials, such as quartz sand, as is done in the manufacture of concrete products.

The aim of the invention is to remedy the noted drawbacks, namely:

- productivity increase,

- expansion of technological capabilities in the receipt of products.

This goal is achieved by the fact that in the method of manufacturing products from slag, including obtaining liquid slag, filling slag into the working cavities of molds, holding slag in molds for cooling, subsequent removal of chilled products from molds, a dose of heated slag is first poured into a specially introduced squeezing chamber, and then the slag is displaced from it into the working cavity of the mold using piston pressure.

Heated slag is forced out of the chamber into the mold at a temperature below the “solidus” point, mainly at 800 ÷ 900 ° C (the range of crystallization of blast furnace slag is 1050 ÷ 1200 ° C).

This makes it possible to reduce the temperature of slag poured into the mold by 300 ÷ 400 ° C, reduce the exposure time of products in the mold, and increase productivity.

Another difference of the method is that for the formation of products using polystyrene foam gasified models.

This solution allows us to solve the problem of turnover of foundry molds, to expand the range of products through the manufacture of a wide range of pipes, art products, including sculptures.

The heat reserve of blast furnace slag can be used to reinforce products with non-compact materials, such as quartz sand or metal chips.

Adding quartz sand to the melt of the slag (with stirring), it is possible to obtain a product that competes in cost and quality with concrete products, and in some cases refuse expensive and environmentally harmful cement in production.

It should be noted that concrete products in comparison with slag are prone to destruction during operation in atmospheric conditions.

Examples of the proposed method.

Example 1

Sill plates, cobblestones for pavements, and art sculptures are obtained in forms according to gasified polystyrene foam models as follows.

The blast donkey melt at a temperature of 1420 ° C is mixed with quartz sand and a certain dose is poured into a squeezing chamber at a temperature of 1020 ° C.

At a temperature of 850 ° C, slag reinforced with sand is displaced by piston pressure into the working cavities of the molds. After solidification of the slag in the molds and cooling of the products to 40 ° C, they are removed from the molds and the process is repeated.

By reducing the temperature of the slag poured into the mold by 300 ° C, the exposure time of the products in the molds is reduced, and productivity is increased.

Example 2

Sibit-type porous building blocks are produced by casting into multi-seat graphite molds in the following sequence.

Blast furnace slag at a temperature of 1420 ° C is poured into a porosator, into which steam is supplied at a pressure of 1 ÷ 3 atm, and for 5 ÷ 6 minutes the slag is foamed until the temperature drops to 1050 ° C, after which a dose of foamed slag is poured into the squeezing chamber and at a temperature of 800 ° C they are forced out under piston pressure into a mold.

After hardening and cooling of the slag in the mold to a temperature of 40 ° C, the resulting block is removed from the mold and the process is repeated. By casting at low temperatures, the production cycle of blocks is shortened.

Example 3

Brake pads from blast furnace slag are obtained as follows.

Expanded polystyrene gasified brake pad models reinforced with steel are mounted in blocks of 40 with a central gate and installed in containers.

The dose of blast furnace slag is poured into a squeezing chamber at a temperature of 1400 ° C and at a temperature of 900 ° C it is displaced under piston pressure into the mold working cavity while vacuuming the container to remove models gasification products. Due to the steel reinforcement, the process of solidification and cooling of the slag is accelerated, which ensures an increase in production productivity.

After cooling, the finished product is removed from the containers and the process is repeated.

The use of the invention allows to increase the production productivity of products and reduce the cost of their manufacture, to utilize metallurgical blast furnace slags, to create products cheaper and more competitive in comparison with concrete products.

Claims (4)

1. A method of manufacturing products from slag, including obtaining liquid slag, filling slag into the working cavities of molds, holding slag in molds for cooling and subsequent removal of cooled products from molds, characterized in that the dose of heated slag is first poured into a specially introduced squeezing chamber, and then displace slag from it into the working cavities of the mold using mechanical pressure. 2. The method of manufacturing products according to claim 1, characterized in that the slag is forced out of the chamber into a mold at a temperature below the solidus point, preferably at 800 ÷ 900 ° C. 3. The method of manufacturing products according to claim 1, characterized in that for the formation of products using polystyrene foam gasified models. 4. The method of manufacturing products according to claim 1, characterized in that the products are reinforced with a non-compact material such as metal chips or quartz sand.