SU529899A1 - Recycling system for slag granulation - Google Patents

Description

one

The invention relates to ferrous metallurgy and can be used primarily for the granulation of blast furnace slag.

In the granulation of slag waste, and water is contaminated with slag slurry and soluble chemical compounds.

A slag graping system is used to prevent pollution of the environment, in particular rivers and lakes.

Known recirculation systems for slag granules contain granulation units, water separators (warehouses of granulated slag or bunker), settling tanks, pumps, and water lines of the circulating cycle 1.

System 2 is another improved system. This recirculation system contains a water jet granulator with a receiving tank, a water separator and a compartment for cleaning the circulating water from the slag. Relatively large slag particles are separated from the heated water in the sump, while the smaller ones are in hydrocyclones. Purified water is pumped from hydrocyclones to the cooler. The cooled water is piped to the water jet pelletizer.

However, the fine particles of slag that have settled in the settling tank are cemented and turned into a solid monolith, which can only be removed with jack hammers, for which it is necessary to empty the septic tanks by disconnecting them from the granulation system or stopping the entire system. Removal of the cemented slag sediment from the sediments is associated with significant labor costs and simple granulation installation and repair. The above granulation devices are expensive and difficult to operate. Pn insufficient degree of water purification from slag quickly izashashivayutsya pipes and pasos, which leads to their frequent replacement. Therefore, to provide the necessary water clarification, it is necessary to increase the capacity of the settling tanks.

The purpose of the invention is to develop a slag granulation system in which the fine slag is completely separated from the water in the sump and is not cemented and its bottom is molded.

This is achieved by passing the water after the granulation of the slag through a settling tank filled with coarse-grained porous granulated slag, which contains at least 80% of granules larger than 1.25 mm. Such slag is produced by measuring technological parameters.

granulation, for example, by reducing the specific consumption of water when blowing.

The surface of porous slag grains is developed, and their chemical affinity with the slag suspension causes a large adhesive effect, due to which a high degree of water purification is achieved. The permeability of the slag in the settling tank is depleted due to the low content of fine fractions in the latter. The captured slag slurry is evenly distributed between the grains of the slag filler and does not form a cementing layer at the bottom of the tank. Slag filler is periodically replaced. The sump is located in close proximity to the granulation plant, which facilitates its filling with slag and cleaning the latter with the shipment of consumers.

A non-perforated wall was installed on the side of the catchment basin, preventing the removal of slag from the settling tank.

A drawing system depicts a recycling system for granulating slag in ylan.

The system contains slag-receiving baths 1 that melt the slag melt into granulators 2. Behind the granulators there is a water separator 3 with a slope of iola to the drain chute 4. The drainage chute is connected to a settling tank 6 by means of a distribution tray 5, which is provided with a horticating wall 7 and a collecting tray 8. The sump is filled with iorite granulated slag containing at least 80% of grains with dimensions greater than 1.25 mm. A collection tray is connected to a discharge chute 9, at the end of which a sump is located 10. Pumps 11 are installed at the end of the treated water at the sump, connected by means of a pipe 12 to the water supply nozzles of the grain tips.

Evaporation of water is compensated for using pipe 13. During granulation, the slag melt from the ladles enters the slag receiving chambers 1 and from them into the granulators 2. Granulated slag accumulates behind the granulators in the water separator 3. Water flows down the slope into the waste chute 4. The bulk of the slag remains in the water separator and the grab cranes are shipped to the consumer. From the gutter, water containing a fine suspension of slag enters the distribution tray 5 and is poured into the sump 6 over its entire length. The passage through the slag filling device removes water from the fine particles and through the perforated wall 7 enters the collecting tray 8, from which it drains } The kelobu 9 is poured into the sump 10. The water from the sump is pumped through pipe 12 to the granulators by pumps 11. As required, fresh water is added to the system at the pipe-line 13, feeding it into the water separator. This prevents the formation of deposited calcium carbonate in the sump.

After saturation of the filler with small particles, the settler is cleaned with a grab crane or a bulldozer and filled with fresh slag. The recovered slag is shipped to customers.

Due to the complete trapping in the settling tank and the prevention of cementation of small particles of slag at its bottom, labor-consuming interactions to remove the cemented monolith are eliminated, the service life of pumps, pipelines and stop valves is increased.

Claims (2)

1. Report of the Institute VNIICHERMETERENERO CLEARING number 25 "Development of a rational scheme of water supply for granulation plants, Donetsk, 1972 2. US patent No. 3615329, cl. In 22D 23/08, 1971 (prototype). in 6 5 3 f / J