A mineral wool boiling melting method of directly using grainy waste slag and coal

Abstract

The invention discloses a mineral wool boiling melting method of directly using grainy waste slag and coal, which pertains to the field of mineral wool production technology. The method includes: taking using grainy waste slag, etc., as mineral wool raw materials, continuously quantitatively adding into the melting bath of a boiling smelter, and using high-pressure and high-temperature air to spray the fuel (coal) into the melting body below the boiling smelter bath surface; providing raw materials, auxiliary materials for the melting bath of the boiling smelter so that the melting bath intensely boils to speed up melting and homogenization of mineral wool raw materials; mineral wool melt body controlling the flow quantity of the flow strand according to the fiber-forming mount requirement of fiber-forming machine, and then guiding the flow strand to the material roller of the fiber-forming machine, to performing the normal mineral wool fiber-forming process. The inventive melting has higher thermal efficiency, which can reach more than 40%, 10 to 15 percentages higher than the ordinary mineral wool cupola. And the invention can significantly reduce the mineral wool melting of the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of mineral wool production, and relates to a low-pollution mineral wool boiling smelting method directly using powdery industrial waste residue and coal powder as raw materials. Background technique [0002] The traditional technology of mineral wool smelting is a cupola smelting technology of mineral wool, which uses lump coke as fuel and massive blast furnace slag, rock or other artificial raw materials processed by agglomeration as the main raw material, which is still widely used at home and abroad. A mineral wool smelting method. Although the mineral wool cupola has a production history of more than 100 years, since it is a vertical furnace, it has brought the following problems: [0003] 1) Mineral wool cupola must use lump coke as fuel [0004] Coke is a secondary energy source formed by complex processes such as selection, washing, blending, and refining of raw coking coal. The production of one to...

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Problems solved by technology

[0006] In order to expand the utilization rate of blast furnace slag, the blast furnace slag in small and medium-sized ironworks is made into granular water-quenched slag and supplied to the cement industry as an admixture, while the massive blast furnace slag that must be used in the smelting of mineral wool For the production of iron and steel enterprises, due to the limitations of the layout, mineral wool production enterprises often need to obtain massive blast furnace slag through long-distance transportation. The cost of long-distance transportation alone sometimes even exceeds the ex-factory price of blast furnace slag. The raw materials must also be made into agglomerates before they can be used in the furnace, which greatly increases the cost of raw materials for mineral wool smelting;

[0007] 3) The smoke and dust pollution in the production process of mineral wool cupola is serious

[0008] Mineral wool cupola produces a lot of smoke and dust during the production process. Under normal circumstances, the initial emission concentration of smoke and dust can reach about 5,000 mg / m3, and the initial emission concentration of smoke and dust at the moment of feeding can be as high as 20,000 mg / m3. (See relevant data on page 4 of "Control of Rock Wool Production Dust" written by Sun Cai, chief engineer of Inner Mongolia New Building Materials Factory), even if strict dust removal measures are taken, it often still far exceeds the emission standard allowed by the state (less than 100 mg / cubic m), which has a serious impact on the environment

[0009] 4) Mineral wool cupola flue gas is difficult to be used for molding and curing of mineral wool products

[0011] Under the current situation, energy prices and transportation costs continue to rise, and the requirements for environmental protection are getting higher and higher. Mineral wool cupolas can no longer fully meet these needs, and have become a bottleneck restricting the continued development of mineral wool production enterprises. A new type of The mineral wool smelting method to replace the relatively backward production equipment of the mineral wool cupola, and the low-pollution mineral wool boiling smelting technology that directly uses powdery industrial waste slag and coal powder is produced under the requirements of such a situation

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