Method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag

A coal chemical wastewater and melting slag technology, which is applied in the field of comprehensive utilization of coal chemical wastewater and waste slag produced in the production of direct reduced iron, can solve the problems of increasing dangerous pollution sources, overflowing sewage, and bursting embankments in case of heavy rain, so as to improve the purity , reduce the amount of steel slag, improve the quality of the effect

Inactive Publication Date: 2015-09-23
苏亚杰
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In winter, the evaporation of evaporative ponds drops significantly, and there is a risk of sewage flooding the embankment, and in summer, there is a risk of embankment collapse due to heavy rain.
The evaporation and crystallization of sewage not only consumes a lot of heat energy, but also has the problem of reprocessing and long-term storage of crystal pollutants, which adds a new dangerous pollution source

Method used

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  • Method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The salt-containing coal chemical wastewater is treated by the sewage purification process to generate reclaimed water for reuse, and the remaining sewage is collected and concentrated to 5% of the volume of the original wastewater to obtain concentrated brine.

[0034] Use 65-80kg of iron concentrate powder, 10-22kg of mixed coal powder, 2-6kg of binder, 2kg of lime powder, 3kg of slaked lime powder, and 2kg of fly ash as raw materials, and mix them uniformly to make iron ore coal pellets.

[0035] Select coal whose melting point of coal ash is at least 200℃ higher than the reduction temperature of direct reduced iron as raw material, and produce crude gas in the coal-to-gas furnace. Dust removal is transported to the direct reduction shaft furnace by the surrounding pipe installed in the reduction shaft furnace, and at the same time, the iron ore coal pellets are loaded into the direct reduction iron shaft furnace through the feeding lock hopper. The raw gas entering ...

Embodiment 2

[0039] Coal chemical industry wastewater containing organic matter is treated by a sewage purification process to generate reclaimed water for reuse, and the remaining sewage is collected and concentrated to 5% of the volume of the original wastewater to obtain concentrated organic concentrated sewage.

[0040] Use 65-80kg of iron concentrate powder, 10-22kg of mixed coal powder, 2-6kg of binder, 2kg of lime powder, 3kg of slaked lime powder, and 2kg of fly ash as raw materials, and mix them uniformly to make iron ore coal pellets.

[0041] Select coal whose melting point of coal ash is at least 200℃ higher than the reduction temperature of direct reduced iron as raw material, and produce crude gas in the coal-to-gas furnace. Dust removal is transported to the direct reduction shaft furnace by the surrounding pipe installed in the reduction shaft furnace, and at the same time, the iron ore coal pellets are loaded into the direct reduction iron shaft furnace through the feeding ...

Embodiment 3

[0045] The coal chemical wastewater containing salt and organic matter is treated by a sewage purification process to produce reclaimed water for reuse, and the remaining sewage is collected and concentrated to 5% of the volume of the original wastewater to obtain concentrated residual sewage.

[0046] Use 65-80kg of iron concentrate powder, 15-21kg of mixed coal powder, 2-6kg of binder, 2kg of lime powder, 3kg of slaked lime powder, and 5kg of fly ash as raw materials, and mix them uniformly to make iron ore coal pellets.

[0047] Select coal whose melting point of coal ash is at least 200℃ higher than the reduction temperature of direct reduced iron as raw material, and produce crude gas in the coal-to-gas furnace. Dust removal is transported to the direct reduction shaft furnace by the surrounding pipe installed in the reduction shaft furnace, and at the same time, the iron ore coal pellets are loaded into the direct reduction iron shaft furnace through the feeding lock hopp...

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Abstract

The invention discloses a method of using coal chemical industry waste water to treat directly-reduced iron melt separation slag to produce water-quenched slag. The method includes: feeding directly-reduced iron generated by a direct-reduction vertical furnace into a melt-separation electric furnace; obtaining melt separation slag through slag-iron separation; utilizing high-temperature sensible heat of the melt separation slag; using concentrated coal chemical industry waste water to perform water-quenching treatment on the melt separation slag to obtain the water-quenched slag serving as a raw material for cement production. By the method, impurity content of waste heat smelting directly-reduced iron is lowered, and purity of directly-reduced iron melt is improved; the coal chemical industry waste water is utilized for water-quenching treatment of the directly-reduced iron melt separation slag to generate the water-quenched slag used for producing cement, so that harmful waste water is changed into a useful resource, and near-zero emission and waste heat utilization of industrial production waste water of coal chemistry industry, metallurgy and power generation.

Description

technical field [0001] The invention relates to comprehensive utilization of industrial waste materials, in particular to a method for comprehensive utilization of coal chemical industry waste water and waste slag produced in direct reduced iron production. Background technique [0002] The blast furnace slag produced by blast furnace ironmaking can produce water-quenched slag after water-quenching treatment. Currently, the water-quenched slag produced is mainly used as raw material for cement production. [0003] In general, steel scrap and direct reduced iron are directly added to the steelmaking furnace for steelmaking. The solid direct reduced iron is melted into molten steel and liquid steel slag during the steelmaking process. Molten steel is separated. Unlike blast furnace slag, the produced steel slag can be directly water-quenched to obtain usable water-quenched slag, because steel slag contains a small amount of metallic iron and undigested lime particles with a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/08
Inventor 苏亚杰陈寿林杜英虎苏亚达
Owner 苏亚杰
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