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Method of melting stainless steel dust, slag and Cr-containing sludge

A technology for stainless steel and dust, which is applied in the field of slag and Cr-containing sludge, and the field of melting stainless steel dust to achieve the effects of short process, easy operation, and reduced control costs

Inactive Publication Date: 2014-07-16
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] A large number of research reports can be found on the recycling of secondary resources such as electric arc furnace dust, slag, and sludge, but it is usually limited to the recycling of a certain secondary resource

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  • Method of melting stainless steel dust, slag and Cr-containing sludge
  • Method of melting stainless steel dust, slag and Cr-containing sludge
  • Method of melting stainless steel dust, slag and Cr-containing sludge

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0024] The present invention will be further explained by the accompanying drawings and specific embod...

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Abstract

The invention belongs to the field of industrial waste recycling and particularly relates to a method of melting stainless steel dust, slag and Cr-containing sludge. The method comprises the steps of drying the stainless steel dust and Cr-containing sludge generated in a stainless steel production process; then, uniformly mixing with a reducer and an additive to prepare self-reductive pellets; adding the obtained pellets into a reaction tank filled with EAF (Effective Attenuation Factor) slag; controlling the temperature of the reaction tank at 1400-1600 DEG C, and adding silicon iron powder into the reaction furnace in the period, wherein the whole treatment process lasts for 40-60 minutes. The method has the advantages of simple and short technical flow, environment protection and energy saving, high metal yield, scale benefit and the like.

Description

technical field [0001] The invention belongs to the field of industrial waste reuse, in particular to a method for melting stainless steel dust, slag and Cr-containing sludge. Background technique [0002] The stainless steel smelting process will produce a large amount of waste slag, and the production of 1 ton of stainless steel can produce about 250kg of waste slag, which contains CaO, MgO, SiO 2 、Al 2 o 3 There are also a certain amount of Fe and Cr oxides, and the temperature of the EAF slag is close to 1700 °C; the sludge is the precipitate from the stainless steel pickling wastewater after being filtered by a filter press, and the content of nickel, chromium and iron is relatively high, and it still contains Cr (VI) and Cr(III), which are more harmful to the environment; stainless steel dust refers to the high-temperature liquid droplets in the electric arc furnace, AOD / VOD furnace or converter under strong agitation, enter the flue and be collected by the bag filte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/32C22C33/04
CPCY02P10/20
Inventor 张延玲郭文明贾昕磊刘洋梁思宁闻昕舒
Owner UNIV OF SCI & TECH BEIJING
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