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Bottom-filtration-process slag treatment method for ferroalloy submerged arc furnace

A submerged arc furnace slag and ferroalloy technology, which is applied in the field of ferroalloy submerged arc furnaces, can solve the problems of high water content in slag, poor quality of water slag, and high transportation cost, so as to reduce the water content, reduce the water content and improve the quality of water slag. Effect

Active Publication Date: 2018-06-29
马钢集团设计研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the current treatment method of ferroalloy submerged arc furnace slag is relatively simple, the transportation cost is high, the quality of water slag is poor, and the moisture content in the slag is high, the present invention provides a new ferroalloy submerged arc furnace slag treatment method with optimized design It improves the existing blast furnace ironmaking slag treatment method, reduces transportation costs, improves the quality of water slag, reduces the moisture content in slag, and satisfies the production and operation requirements of ferroalloy submerged arc furnace slag treatment process equipment to the greatest extent

Method used

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  • Bottom-filtration-process slag treatment method for ferroalloy submerged arc furnace

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Embodiment 1

[0040] This embodiment provides a ferroalloy submerged arc furnace bottom filtration method slag treatment method, comprising the following steps:

[0041] 1. Overflow: After the ferroalloy submerged arc furnace slag is separated from the slag and iron in the molten iron, the slag overflows into the slag ditch 2 through the slag tank 1;

[0042] 2. Crushing: when the molten slag in the slag ditch 2 flows into the water slag ditch 4, it is broken by the high-speed water flow ejected from the punching box 3, water-quenched and granulated to obtain a slag-water mixture;

[0043] 3. Cooling: the slag-water mixture flows into the buffer tower 5 through the water slag ditch 4 to continue cooling;

[0044] 4. Filtration: The slag-water mixture in the buffer tower 5 directly flows into the filter tank 8 through the buffer tower outlet device 6 for filtration.

[0045] In the traditional ferroalloy submerged arc furnace production process, the ferroalloy slag is usually treated by the...

Embodiment 2

[0048]This embodiment is further improved on the basis of embodiment 1. The hydraulic pressure range of the punching tank 3 during slag flushing is 0.20-0.25 MPa. The water pressure during blast furnace slag punching is generally 0.12-0.15 MPa, but ferroalloy submerged arc slag has a higher viscosity and higher temperature than blast furnace slag, so it is necessary to re-determine the appropriate water pressure range. After many tests and adjustments, the water pressure of 0.20-0.25MPa is the most suitable pressure range. When using 0.19MPa hydraulic pressure to flush slag, the ferroalloy slag cannot be fully broken and cannot be cooled rapidly. When using 0.26MPa hydraulic pressure When flushing slag, slag wool begins to be produced, which is easy to block the filter tank 8. Use 0.20-0.25MPa hydraulic pressure to flush slag, especially when the water pressure is 0.23MPa, the effect of crushing and granulating slag is the best, and the amount of slag wool produced Also the sm...

Embodiment 3

[0050] This embodiment is further improved on the basis of Example 2. The slope of the water slag ditch 4 is not less than 6%, and the slope less than 6% is not conducive to the forward movement of the water slag mixture. In practical applications, a slope of 5 is used. When using the slag ditch with a slope of 7%, it will be used for about 40 days. Due to the increase of sediment at the bottom of the slag ditch, the liquid level in the ditch will be raised, and the slag ditch will be piled up gradually. When using a slag ditch with a slope of 7%, use In 90 days, there was no heaping phenomenon in the slag ditch. At the same time, in order to ensure that the steam generated during the slag flushing process does not overflow in large quantities, and that the slag-water mixture does not splash randomly during slag flushing, a cover plate is arranged above the water slag ditch 4 .

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Abstract

The invention discloses a bottom-filtration-process slag treatment method for a ferroalloy submerged arc furnace and belongs to the technical field of ferroalloy submerged arc furnace. The method comprises the following steps of making molten slag overflow into a molten slag ditch via a slag tank; performing crushing, water quenching and pelletizing on the slag which flows from the molten slag ditch into a waste slag ditch by high-speed water flow sprayed out of a punching box; making a slag and water mixture flow from the water granulated slag ditch into a buffer tower and continuing to coolthe slag and water mixture; making the slag and water mixture inside the buffer tower directly flow into a filter tank via an outlet device; filtering the water inside the filter tank by using a filter pipe, and conveying the water to a slag treatment water pool by using a water pump; conveying the water inside the water pool to the punching box in order to realize slag punching and cyclic utilization; and grabbing out the water granulated slag from the filter tank by using a water granulated slag grabbing hopper. The method disclosed by the invention is simple in process and reasonable in procedures, commendably guarantees the granulation degree of the slag, realizes more complete slag and water separation, greatly reduces emission of steam, reduces environmental pollution and realizes simple industrial implementation.

Description

technical field [0001] The invention relates to the technical field of ferroalloy submerged arc furnaces, in particular to a method for treating slag of ferroalloy submerged arc furnace bottom filtration method. Background technique [0002] At present, in the ferroalloy submerged arc furnace production process, the traditional ferroalloy slag treatment method is relatively simple, and the water quenching method of slag foaming in the sedimentation tank is basically used, and the slag is transported to the slag pool by the slag tank truck, and the high temperature slag is directly poured into In the pool, the slag is quenched and granulated when it encounters water, and then the slag is grabbed by a grab bucket to the slag yard, where it is naturally dehydrated and then shipped out. [0003] Although the ferroalloy submerged arc furnace slag can be processed and utilized, it has the following disadvantages: the foaming slag method has the phenomenon of blasting, which has po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08
CPCC21B3/06C21B3/08Y02W30/50
Inventor 伏明陈冬朱兴华侯玉伟李洪费书文聂长果
Owner 马钢集团设计研究院有限责任公司
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