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Method for recovering chromium resources in electric furnace stainless steel slag

A technology for recycling stainless steel slag and resources, applied in the field of comprehensive utilization of metallurgical solid waste resources, can solve the problems of difficult recovery of chromium resources, small size of spinel, and high processing cost, and achieve the advantages of inhibiting dissolution risk, improving grade and low energy consumption. Effect

Active Publication Date: 2022-08-05
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems of secondary pollution, high processing cost, small spinel size and difficult recovery of chromium resources in existing methods for recovering chromium from stainless steel slag

Method used

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  • Method for recovering chromium resources in electric furnace stainless steel slag
  • Method for recovering chromium resources in electric furnace stainless steel slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] After the stainless steel slag produced by the electric furnace is normally released, the high temperature stainless steel slag is put into the slag tank. The main components of the stainless steel slag are CaO 45%, SiO 2 30%, MgO 8%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%, the crystal phase of the stainless steel slag is as follows figure 1 shown.

[0036] will Al 2 O 3 and SiO 2 The modifier is added to the high temperature stainless steel slag, and makes the stainless steel slag and Al 2 O 3 The additives are mixed uniformly to form a molten mixed slag, in which Al 2 O 3 The mass of the additive is 4% of the stainless steel slag, SiO 2 The mass of the additive is 10% of the stainless steel slag, SiO 2 and Al 2 O 3 grinding to a particle size of ≤74 mesh; the basicity of the modified stainless steel slag ( w (CaO) / w (SiO 2 )) around 1.1, Al 2 O 3 The content is close to 7%.

[0037] The stainless steel slag after high temperature modification was low...

Embodiment 2

[0039] After the stainless steel slag produced by the electric furnace is normally released, the high temperature stainless steel slag is put into the slag tank. The main components of the stainless steel slag are CaO 45%, SiO 2 30%, MgO 8%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%.

[0040] will Al 2 O 3 and SiO 2 The modifier is added to the high temperature stainless steel slag, and makes the stainless steel slag and Al 2 O 3 and SiO 2 The additives are mixed uniformly to form a molten mixed slag, in which Al 2 O 3 The mass of the additive is 8% of the stainless steel slag, SiO 2 The mass of the additive is 10% of the stainless steel slag, SiO 2 and Al 2 O 3 grinding to a particle size of ≤74 mesh; the basicity of the modified stainless steel slag ( w (CaO) / w (SiO 2 )) around 1.1, Al 2 O 3 The content is close to 10%.

[0041] The stainless steel slag after high temperature modification was lowered to 1300°C at 3°C / min, and kept for 60min. The chromium in t...

Embodiment 3

[0043] After the stainless steel slag produced by the electric furnace is normally released, the high temperature stainless steel slag is put into the slag tank. The main components of the stainless steel slag are CaO 45%, SiO 2 30%, MgO 8%, Al 2 O 3 4%, FeO 3%, Cr 2 O 3 5%.

[0044] will Al 2 O 3 and SiO 2 The modifier is added to the high temperature stainless steel slag, and makes the stainless steel slag and Al 2 O 3 The additives are mixed uniformly to form a molten mixed slag, in which Al 2 O 3 The mass of the additive is 12% of the stainless steel slag, SiO 2 The mass of the additive is 15% of the stainless steel slag, SiO 2 and Al 2 O 3 grinding to a particle size of ≤74 mesh; the basicity of the modified stainless steel slag ( w (CaO) / w (SiO 2 )) around 1.0, Al 2 O 3 The content is close to 13%.

[0045] The stainless steel slag after high temperature modification was lowered to 1300°C at 3°C / min, and kept for 30min. The chromium in the treated...

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Abstract

The invention provides a method for recovering chromium resources in electric furnace stainless steel slag, comprising the following steps: 1) charging molten stainless steel slag into a slag tank, adding a modifier into it, and adjusting the basicity and Al of the stainless steel slag. 2 O 3 content, reduce the melting temperature of the stainless steel slag to below 1500 °C, and make the solid phase particles in the original stainless steel slag disappear; 2) Cool down the modified stainless steel slag to below 1400 °C, so that the chromium in the stainless steel slag will move to a stable spinel Stone phase enrichment; 3) After the above-mentioned treated stainless steel slag is subjected to thermal stewing treatment, the chromium-containing spinel is separated by the method of re-election. The invention controls the basicity and Al of the stainless steel slag 2 O 3 If the content is in a suitable range, the stainless steel slag can be completely melted, and the solid phase particles in the original stainless steel slag will disappear. The growth of crystals creates favorable conditions for re-selection and separation of chromium resources, and inhibits the risk of chromium dissolution.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical solid waste resources, and particularly relates to a method for recovering chromium resources in electric furnace stainless steel slag. Background technique [0002] The iron and steel industry is the basic industry for the development of the national economy and an important material guarantee for the realization of my country's modernization drive. In recent years, my country's stainless steel industry has made great progress and has become a veritable stainless steel production country. As of 2018, my country's stainless steel production has reached 2,670 tons. Based on the production of about 0.2 tons of stainless steel slag per ton of steel, the current annual output of stainless steel slag exceeds 5 million tons. [0003] Because stainless steel slag contains a certain amount of chromium element, its comprehensive utilization has also been concerned by sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/32
CPCC22B7/04C22B7/001C22B34/32Y02P10/20
Inventor 李伟坚操龙虎成剑明封伟华
Owner WISDRI ENG & RES INC LTD
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