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A method for preparing low-sulfur iron-chromium-nickel alloy block by using stainless steel dust

A technology of chromium-nickel alloy and stainless steel, which is applied in the field of circular treatment of metallurgical solid waste, can solve the problems of poor separation effect of slag and gold, large amount of slag, low recovery rate of chromium and nickel, etc., achieves reduction of raw material supply cost, simple production process, The effect of high purity

Active Publication Date: 2018-11-02
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

The disadvantage is that the treatment period is long, the recovery rate of chromium and nickel is low, and the amount of slag is large
[0004] The patent application number 02149183.6 discloses a method for recovering valuable metals in stainless steel dust by using reducing agent aluminum powder; A method for valuable metals; application number 201410169736.1 discloses a method for mixing stainless steel dust, slag and Cr sludge into blocks, and preparing iron-chromium-nickel alloy through ferrosilicon reduction; A method in which pellets are prepared together with a binder and a reducing agent and used as a converter coolant; although these methods of recycling valuable metals from stainless steel dust can obtain iron-chromium-nickel alloy blocks, the separation effect of slag and gold is poor, resulting in metal The recovery rate, especially the recovery rate of chromium, is low; in addition, the previous people analyzed the reduction rate of metal in the dust from the metal phase without considering the error caused by the oxidation of the metal phase, and did not consider the influence of the harmful element sulfur in the reduction process, making The quality of the prepared iron-chromium-nickel alloy block cannot be guaranteed, which brings difficulties to the subsequent recycling of iron-chromium-nickel alloy; this patent proposes a new process of reducing and recovering iron-nickel-chromium alloy block by stainless steel dust in an iron bath, while considering The removal efficiency of the harmful element sulfur in the reduction process can solve the difficult problem of slag-gold separation while ensuring the purity of the prepared alloy block and creating conditions for subsequent recycling; so far, there are no domestic and foreign patents and non-patent literature. A method for preparing low-sulfur Fe-Cr-Ni alloy blocks directly from stainless steel dust is proposed

Method used

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  • A method for preparing low-sulfur iron-chromium-nickel alloy block by using stainless steel dust
  • A method for preparing low-sulfur iron-chromium-nickel alloy block by using stainless steel dust
  • A method for preparing low-sulfur iron-chromium-nickel alloy block by using stainless steel dust

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Experimental program
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Effect test

Embodiment 1

[0052] The stainless steel dust adopts a 150t electric furnace in a domestic factory, and its composition contains 5% CaO, Cr 2 o 3 20%, NiO 2.5%, SiO 2 5%, Fe 2 o 3 60%, S 0.3%, and the rest are impurities;

[0053] The stainless steel dust is crushed to a particle size ≤ 1mm, and then a binder and an additive are added to make a mixed raw material; the binder is sucrose water with a weight concentration of 43%; the additive is a reducing agent graphite carbon, CaF 2 and SiO 2 ; The binder accounts for 10% of the total weight of the mixed raw materials, the reducing agent graphite carbon accounts for 17% of the total weight of the mixed raw materials, CaF 2 10% of the total weight of mixed raw materials, SiO 2 The dosage is based on the alkalinity of the mixed raw materials (SiO 2 / CaO) is 1.2, and the rest are stainless steel dust after crushing;

[0054] The particle size Φ distribution of the crushed stainless steel dust is: 38μm≤Φ<50μm accounts for 14.7% of the...

Embodiment 2

[0060] The stainless steel dust adopts a 210t converter in a domestic factory, and its composition contains 10% CaO, Cr 2 o 3 15%, NiO 3%, SiO 2 4.8%, Fe 2 o 3 55%, S 0.4%, and the rest are impurities;

[0061] Method is with embodiment 1, and difference is:

[0062] (1) binding agent is that weight concentration is 45% sucrose water; Binding agent accounts for 8% of mixed raw material gross weight, and reducing agent graphite carbon accounts for 15% of mixed raw material gross weight, and CaF 2 8% of the total weight of mixed raw materials, SiO 2 The dosage is based on the alkalinity of the mixed raw materials (SiO 2 / CaO) is 1.4;

[0063] The particle size Φ distribution of the crushed stainless steel dust is: 38μm≤Φ<50μm accounts for 16.5% of the total weight, the particle size of 50μm≤Φ<150μm accounts for 30.9% of the total weight, and the particle size of 150μm≤Φ<270μm The part accounts for 42.8% of the total weight, the part with a particle size of 270μm≤Φ≤1000...

Embodiment 3

[0068] The stainless steel dust adopts a 120t VOD furnace in a domestic factory, and its composition contains 20% CaO, Cr 2 o 3 14.5%, NiO 5%, SiO 2 3.9%, Fe 2 o 3 50%, S 0.5%, and the rest are impurities;

[0069] Method is with embodiment 1, and difference is:

[0070] (1) binding agent is that weight concentration is 47% sucrose water; Binding agent accounts for 6% of mixed raw material gross weight, and reducing agent graphite carbon accounts for 13% of mixed raw material gross weight, and CaF 2 6% of the total weight of mixed raw materials, SiO 2 The dosage is based on the alkalinity of the mixed raw materials (SiO 2 / CaO) is 1.6;

[0071] The particle size Φ distribution of the crushed stainless steel dust is as follows: the part with a particle size of 38μm≤Φ<50μm accounts for 13.8% of the total weight, the part with a particle size of 50μm≤Φ<150μm accounts for 37.5% of the total weight, and the part with a particle size of 150μm≤Φ<270μm The part accounts for ...

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Abstract

The invention discloses a method for preparing a low-sulfur iron-chromium-nickel alloy block through stainless steel dust. The method is conducted according to the following steps that firstly, a bonding agent and an additive are added into stainless dust after the stainless dust is broken, and the stainless dust is prepared into a mixed raw material; secondly, the mixed raw material is put into a die to be pressed into a block, the block is dried to reach constant weight, and a cold consolidation block is obtained; and thirdly, the cold consolidation block and cast iron are put into an alumina crucible in a reducing furnace to be heated to 1400 DEG C to 1600 DEG C and are reduced for 40 min to 50 min, and the iron-chromium-nickel alloy block and slag are obtained in the alumina crucible. By means of the method, the stainless steel dust can be directly used for preparing the iron-chromium-nickel alloy block needed in stainless steel production, the production technology is relatively simple, rough products have the beneficial effects that impurities are few and purity is high; and stainless steel other liquid source supply in the stainless steel production process can be achieved on the premise that high additional value utilization of stainless steel dust of a steel making enterprise is achieved.

Description

technical field [0001] The invention belongs to the technical field of circular treatment of metallurgical solid waste, in particular to a method for preparing low-sulfur iron-chromium-nickel alloy block by using stainless steel dust. Background technique [0002] With the increasing use of stainless steel products, the market demand for them has increased sharply; at present, the domestic stainless steel production capacity has exceeded 10 million tons, ranking first in the world's stainless steel production; due to the good corrosion resistance of stainless steel products, they are widely used in Medical, military, and daily life; however, 1-5% of stainless steel dust will be produced during the smelting of stainless steel in electric arc furnace or VOD / AOD furnace, and stainless steel dust contains a large amount of heavy metals such as Cr and Ni. Recycling will inevitably result in the waste of valuable metals and bring potential risks to the environment. [0003] The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/22C22B7/02
CPCC22B1/22C22B7/02Y02P10/20
Inventor 张慧宁董建宏干磊熊辉辉姜平国
Owner JIANGXI UNIV OF SCI & TECH
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