Method and special equipment for treating slag in smelting process of blast furnace or submerged arc furnace

Abstract

The invention relates to a method and special equipment for treating slag in the smelting process of a blast furnace or a submerged arc furnace, belonging to the technical field of slag treatment of the blast furnace or submerged arc furnace. A water filter is arranged between granulation equipment and slag treatment equipment; a shell (9) has a groove profile with an upper opening, and a feedingport (29) and a discharging port (28) of the shell (9) are respectively connected with the granulation equipment and slag treatment equipment; at least one layer of filter screen (25) is arranged at the bottom of the shell (9), and filter stones (13) are arranged on the filter screen (25). The special equipment has the beneficial effects that the water quantity entering the slag treatment equipment is reduced, the water filtering effect is good, the conveying capacity and efficiency of the slag treatment equipment are improved, the abrasion to the equipment is reduced, and the service life ofthe equipment is prolonged; the filtered water quality is ensured, wear-resistant pipelines and slurry pumps are not required, equipment investment and failure rate are greatly reduced, and residual hot water can be used for power generation and heating.

Description

technical field [0001] The invention relates to a processing method and special processing equipment for molten slag in the blast furnace or submerged arc furnace smelting process. The molten slag produced in the blast furnace or submerged arc furnace and other metal smelting processes is subjected to high-pressure water quenching and granulation, and the slag-water mixture is separated. The invention belongs to the technical field of blast furnace or submerged arc furnace slag treatment. Background technique [0002] At present, in the field of metal smelting, many blast furnace or submerged arc furnace slag treatment technologies have been used, including: bottom filtration method, Lhasa method, Yinba method, Tula method, etc. These slag treatment technologies exist to varying degrees some problems. For example: the process flow of the bottom filtration method is that the blast furnace or submerged arc furnace slag is granulated by high-pressure water, enters the slag dit...

AI Technical Summary

Problems solved by technology

For example: the bottom filtration process is that the blast furnace or submerged arc furnace slag is granulated by high-pressure water, enters the slag ditch, enters the slag pool from the slag ditch, filters or settles in the slag pool, and drives the grab to filter or settle the slag The slag is transported to other locations. The bottom filtration method has problems such as high engineering investment, large floor area, and easy compaction of the slag pool.

The Tula method process is that the blast furnace or submerged arc furnace slag is granulated by high-pressure water, then enters the slag flushing ditch, then enters the slag feeding chute from the slag flushing ditch, and then enters the rotary filter. The slag-water mixture is dehydrated in the rotary filter. The top of the rotary filter falls into the slag discharge chute, then enters the belt conveyor, and is transported to the designated place by the belt conveyor. The water and fine slag filtered out at the bottom of the rotary filter return to the pool of the pump station through the slag water conveying pipeline; Lhasa method, The slag treatment methods such as the Yinba method and the Tula method have problems such as high engineering investment, large slag content in filtered water quality, and high failure rate.

The important reasons for the above problems are: first, there is no water filtration behind the slag flushing ditch, so that the water content of the slag-water mixture is too high; second, the filter screen of the rotary filter is made of stainless steel, and the fine slag will pass through the filter screen Entering the return water pipeline, resulting in poor water filtration effect, unable to guarantee the filtered water quality, and the residual hot water will not be directly used for heating and power generation

In addition, since the filtered water contains impurities, the water pumps and pipelines in the system are all wear-resistant pipelines and wear-resistant water pumps, which increases the cost and maintenance workload of the system

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