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Stainless steel dedusting recycling method

A stainless steel and limestone technology, applied in the field of stainless steel dust removal and recycling, can solve the problems of high production and processing costs, low iron content in dust removal dust, and inability to stabilize production for a long time, and achieve the effects of stable production and low recovery cost.

Inactive Publication Date: 2015-06-17
ANYANG DINGHE NICKEL IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two treatment methods are both due to the low iron content of the dust removal ash, which cannot be produced stably for a long time, resulting in high production and processing costs and cannot be popularized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mass percentages of main chemical components in stainless steel dust are: nickel: 0.55%, chromium: 8.45%, manganese: 8.24%, iron: 35.02%, silicon dioxide: 6.36%, calcium oxide: 5.86%, magnesium oxide: 2.15%, aluminum oxide: 0.94%, sulfur: 0.26%, phosphorus: 0.02%, and the rest is waste residue.

[0023] A method for reusing stainless steel dedusting ash, comprising the following steps:

[0024] (1) Stainless steel dust removal ash mixture

[0025] Add the following additives to each ton of dedusting ash, coal: 47kg, bentonite: 25kg, limestone: 120kg, silica: 42kg, alumina: 8kg, calcium carbide: 36kg, then add appropriate amount of water and reducing agent, and mix to form a mixture;

[0026] Among them, the mass percentage of chemical composition of coal is fixed carbon: 54.3%, volatile matter: 28.3%, ash content: 13%, sulfur: 1.5%, phosphorus: 0.03%, water: 2.87%.

[0027] (2) Cold-junction briquettes

[0028] The stainless steel dedusting mixture prepared in th...

Embodiment 2

[0041] The mass percentages of main chemical components in stainless steel dust are: nickel: 0.55%, chromium: 8.45%, manganese: 8.24%, iron: 35.02%, silicon dioxide: 6.36%, calcium oxide: 5.86%, magnesium oxide: 2.15%, aluminum oxide: 0.94%, sulfur: 0.26%, phosphorus: 0.02%, and the rest is waste residue.

[0042] A method for reusing stainless steel dedusting ash, comprising the following steps:

[0043] (1) Stainless steel dust removal ash mixture

[0044] Add the following additives to each ton of dedusting ash, coal: 47.2kg, bentonite: 34kg, limestone: 119kg, silica: 41.8kg, alumina: 7.5kg, calcium carbide: 35.9kg, then add appropriate amount of water and reducing agent, mix well into a mixture;

[0045] Among them, the mass percentage of chemical composition of coal is fixed carbon: 54.3%, volatile matter: 28.3%, ash content: 13%, sulfur: 1.5%, phosphorus: 0.03%, water: 2.87%.

[0046] (2) Cold-junction briquettes

[0047] The stainless steel dedusting mixture prepare...

Embodiment 3

[0060] The mass percentages of the main chemical components in stainless steel dust are: nickel: 0.55%, chromium: 8.45%, manganese: 8.24%, iron: 35.02%, silicon dioxide: 6.36%, calcium oxide: 5.86%, magnesium oxide: 2.15%, aluminum oxide: 0.94%, sulfur: 0.26%, phosphorus: 0.02%, and the rest is waste residue.

[0061] A method for reusing stainless steel dedusting ash, comprising the following steps:

[0062] (1) Stainless steel dust removal ash mixture

[0063] Add the following additives to each ton of dedusting ash, coal: 53kg, bentonite: 30kg, limestone: 100kg, silica: 50kg, alumina: 7kg, calcium carbide: 30kg, then add appropriate amount of water and reducing agent, and mix to form a mixture;

[0064] Among them, the mass percentage of chemical composition of coal is fixed carbon: 54.3%, volatile matter: 28.3%, ash content: 13%, sulfur: 1.5%, phosphorus: 0.03%, water: 2.87%.

[0065] (2) Cold-junction briquettes

[0066] The stainless steel dedusting mixture prepared i...

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Abstract

The invention discloses a stainless steel dedusting recycling method. The method comprises the following steps: 1, preparing a stainless steel dedusting mixture: adding 47-62kg of coal, 25-34kg of bentonite, 80-120kg of limestone, 42-61kg of silica, 5-8kg of alumina and 18-36kg of calcium carbide in deudsting of each ton of stainless steel, adding a proper amount of water and a reducing agent, and uniformly mixing to prepare the mixture; 2, carrying out cold sintering briquetting; 3, drying; 4, carrying out kiln feeding: sending stainless steel dedusting spheres to a rotary kiln; 5, carrying out rotary kiln smelting: preheating the dedusting spheres in the rotary kiln, dehydrating, adding the reducing agent, and reacting; 6, slagging: sending the stainless steel dedusting spheres out of the rotary kiln after slagging; and 7, carrying out magnetic separation: separating various valuable elements from the stainless steel dedusting spheres through a magnetic separation machine to obtain a finished product. The method has the advantages of stable production, and low recovery cost accounting for 1 / 3 of the electric furnace recovery cost.

Description

technical field [0001] The invention relates to a method for recycling stainless steel dust. Background technique [0002] my country's stainless steel industry is growing day by day, and the dust removal dust of stainless steel factories is increasing day by day. Because the dust removal dust of stainless steel contains nickel, chromium, manganese and other substances, it is easy to cause serious pollution to the environment. At present, there are two domestic treatment methods for stainless steel dust removal as follows: 1. The pressure ball is returned to the stainless steel factory and directly put into the furnace. 2. Recycled in the factory as sinter ingredients. These two treatment methods are all because of the low iron content of the dust removal ash and cannot be produced stably for a long time, resulting in higher production and processing costs and cannot be popularized. Contents of the invention [0003] In order to overcome the above-mentioned disadvantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02
CPCY02P10/20
Inventor 任现苹王树军张民庆
Owner ANYANG DINGHE NICKEL IND SCI & TECH