Method of comprehensive utilization of steelmaking refining precipitator dust

An alkaline and waste water technology, applied in the field of comprehensive utilization of resources, can solve problems such as acid waste water not involved in dust removal, achieve significant economic and environmental benefits, and realize the effect of recycling

Active Publication Date: 2017-05-31
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Method of comprehensive utilization of steelmaking refining precipitator dust

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[0026] Example 1

[0027] The cold-rolling acid wastewater with a pH value of about 2.0 to 2.5 is treated with the steelmaking refining dust removal ash shown in Table 1. Send steelmaking refining dust to the silo of the cold-rolling acid wastewater treatment system, and the alkaline neutralizer is made into an emulsion and stored for later use; various cold-rolling acid wastewater is discharged into the regulating tank for aeration treatment, and the effluent is lifted by the The pump enters the first-level neutralization tank, and the first-level neutralization tank continues to aerate to further oxidize the ferrous ions. At the same time, 0.15% to 0.20% of the total mass of the wastewater is added to the steelmaking refining dust to adjust the pH value of the wastewater to 7.0 or so, then add 0.01% to 0.03% calcium hydroxide of the total mass of the wastewater to further control the pH value of the wastewater at 9 to 9.5;

[0028] The effluent flows to the secondary neutra...

Example Embodiment

[0030] Example 2

[0031] The cold rolling acid wastewater with a pH value of about 1.5 to 2.0 is treated with the steelmaking refining dust removal ash shown in Table 1. Send steelmaking refining dust to the silo of the cold-rolling acid wastewater treatment system, and the alkaline neutralizer is made into an emulsion and stored for later use; various cold-rolling acid wastewater is discharged into the regulating tank for aeration treatment, and the effluent is lifted by the The pump enters the first-level neutralization tank, and the aeration continues in the first-level neutralization tank to further oxidize the ferrous ions. At the same time, 0.20% to 1.0% of the total mass of the wastewater is added to the steelmaking refining dust to adjust the pH value of the wastewater to 7.0 or so, then add 0.01% to 0.03% of the total mass of the wastewater sodium hydroxide to further control the pH value of the wastewater at 9 to 9.5;

[0032] The effluent flows to the secondary ne...

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Abstract

The invention relates to a method of comprehensive utilization of steelmaking refining precipitator dust. According to the invention, steelmaking refining precipitator dust is used to neutralize acidic cold rolling wastewater; specifically, alkaline substances such as CaO in the refining precipitator dust is used to neutralize acidic cold rolling wastewater; the wastewater is subjected to such processes as aeration, neutralization, PH adjustment and flocculating settling to meet the discharge standard; moreover, valuable elements such as Fe and Zn in the steelmaking refining precipitator dust and the acidic cold rolling wastewater enters into settled sludge; the sludge is dehydrated and filter-pressed into mud cake; and the mud cake is treated through a high temperature reduction process to obtain metallized pellets and dust rich in zinc, and such valuable elements as Fe and Zn are recovered. According to the invention, both steelmaking refining precipitator dust and acidic cold rolling wastewater can be treated simultaneously, and therefore, the problems in environmental protection are solved, and waste control by waste is achieved; in addition, such value elements as Fe, Zn and Mn in the steelmaking refining precipitator dust and the acidic cold rolling wastewater can be recovered, thereby achieving recycling of resources and providing significant economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources, and relates to a method for comprehensive utilization of steelmaking, refining and dust removal. Background technique [0002] The refining furnace is a kind of smelting equipment in the thermal processing industry. In the refining furnace, the functions of degassing, adjusting the composition, adjusting the temperature, and removing inclusions of molten steel can be completed. During the steelmaking and refining process, the ultrafine particles in some metallurgical raw materials will be sucked into the ash bin by the dust removal system and become the main component of the steelmaking and refining dust. In addition, during the refining process, some raw and auxiliary materials are Under the action of the gas, vaporization occurs, and a series of chemical reactions occur during the vaporization process. After entering the pipeline of the dust removal system, it is rapidly co...

Claims

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Application Information

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IPC IPC(8): C02F9/04C22B7/00C22B19/30C22B47/00B09B3/00B09B5/00C02F103/16C02F101/20
CPCC22B7/00C22B19/30C22B47/00C02F9/00B09B5/00C02F2301/08C02F2101/206C02F2101/203C02F2101/20C02F2103/16C02F1/727C02F1/66C02F1/56B09B3/80B09B3/40Y02P10/20
Inventor 毛瑞杜屏茅沈栋
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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