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Method for recycling treated ladle refining waste residues

A ladle refining and recycling technology, applied in recycling technology, chemical instruments and methods, and improvement of process efficiency, can solve problems such as difficulty in taking into account large quantities and low-cost processing

Pending Publication Date: 2021-09-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the problem that the ladle refining waste slag in the prior art is difficult to be treated in large quantities and at low cost. It intends to provide a method for recycling the ladle refining waste slag after treatment, which not only has a high desulfurization rate and a fast desulfurization speed, but also can Reuse the removed sulfur-containing substances, greatly improving economic benefits

Method used

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  • Method for recycling treated ladle refining waste residues

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Embodiment 1

[0032] Such as figure 1 As shown, a method for recycling ladle refining waste slag in this embodiment after treatment includes the following steps:

[0033] S1: Mixing solid waste: mixing ladle refining waste slag and secondary aluminum ash in a certain proportion, so that N / S=1~2 in the mixed mixture, wherein ladle refining waste slag includes the following components in mass percentage: 40%~55% %CaO, 8%~20%SiO 2 ,8%~30%Al 2 o 3 , 0.5%≤(FeO+MnO), 0.3%~1.2% S and a small amount of other components. Secondary aluminum ash includes the following components in mass percentage: 50% to 60% Al 2 o 3 , 1% to 10% Al, 5% to 30% AlN, 3% to 6% SiO 2 , 1%≤(FeO+MnO), 2%~3%MgO, 1%~3%Na 2 O and a small amount of other ingredients.

[0034] S2: Water immersion of the mixture: mix and stir the above mixture and water according to the ratio of 1:2 to 1:3, and leach at room temperature. Specifically, in this embodiment, put the mixture in the leaching tank, Add water, stir for 20min to ...

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Abstract

The invention discloses a method for recycling treated ladle refining waste residues, and belongs to the technical field of secondary resource recycling. The method comprises the following operation steps: solid waste mixing: mixing the ladle refining waste residues and secondary aluminum ash according to a certain proportion, so that N / S in the mixed mixture is 1-2; mixed material water leaching: mixing and stirring the mixture and water according to the proportion of 1: 2-1: 3, and performing leaching at the normal temperature; and solid-liquid separation: after leaching for a period of time, directly discharging an upper-layer solution, carrying out solid-liquid separation on lower-layer slurry, retaining the separated filtrate in next mixed material water leaching for reuse, and heating and roasting the separated filter residues for 2-3 hours. The invention aims to overcome the problem that in the prior art, the ladle refining waste residues are difficult to treat in a large amount and at low cost, and provides the method for recycling the treated steel ladle refining waste residues, so that the desulfurization rate is high, the desulfurization speed is high, the removed sulfur-containing substances can be reused, and the economic benefit is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of recycling of secondary resources, and more specifically relates to a method for recycling waste slag from ladle refining after treatment. Background technique [0002] In 2020, my country's steel output will be close to 1.053 billion tons, and the discharge of ladle refining waste residue will reach 15-20 million tons. At present, there is no large-scale utilization method for this slag, and it is mostly disposed of in the form of stockpiling. This not only occupies land, wastes resources, but also pollutes the environment. Proper treatment measures are urgently needed. At present, the utilization method of ladle refining waste slag under research is aimed at two directions: internal circulation and external utilization. [0003] 1. Internal circulation refers to the internal use of iron and steel enterprises. Currently, it is mainly used in ladle refining stations and converter steelmaking stations. (1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21C7/076C01C1/00C01C1/20
CPCC21B3/06C21C7/076C01C1/20C01C1/00C21B2400/03C21C2200/00Y02W30/50Y02P10/20
Inventor 吴六顺周云柳昆龙王珏王海川董元箎
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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