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Stainless steel oxide skin treatment method

A treatment method and oxide scale technology, applied in the direction of improving process efficiency, can solve the problems of large consumption of reagents, low leaching rate, and difficulty in dissolving, and achieve the effects of increasing leaching efficiency, simple treatment and high profit.

Active Publication Date: 2019-05-10
鲍君杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For this part of stainless steel oxide scale, because it contains valuable metals such as iron, nickel, chromium, etc., its resource utilization has attracted everyone's attention, because this oxide scale has a dense oxide structure, and most of them are high-valence metal oxides. It is not easy to be dissolved, resulting in low leaching rate, high cost and large consumption of reagents

Method used

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Effect test

Embodiment 1

[0036] A treatment method for stainless steel scale, characterized in that it comprises the following steps:

[0037] (1) The stainless steel scale is ball milled, and the finely ground material is sieved through 150 meshes, and the sieve is returned to the ball mill;

[0038] (2) Add sulfuric acid solution to the sieved material, then put it in the autoclave, be warming up to the temperature in the autoclave is 220 ℃, feed sulfur dioxide gas so that the pressure in the autoclave is 5.5 atmospheres, and then Stir and react at high temperature for 4 hours, then release the pressure and lower the temperature, pour out the material, filter to obtain the filtrate and filter residue, and return the filter residue to leaching;

[0039] (3) The pH of the solution obtained by adding ammonia water to the filtrate obtained in step (2) is 2.3, then adding ammonium sulfide solution, stirring and reacting for 1.5h, then filtering to obtain the first filter residue and the first filtrate, a...

Embodiment 2

[0057] A treatment method for stainless steel scale, characterized in that it comprises the following steps:

[0058] (1) The stainless steel scale is ball milled, and the finely ground material is sieved through 200 meshes, and the sieve is returned to the ball mill;

[0059] (2) The sieved material is added to the sulfuric acid solution, then put into the autoclave, and the temperature in the autoclave is heated up to 220° C., and the sulfur dioxide gas is passed into so that the pressure in the autoclave is 5.6 atmospheres, and then Stir and react at high temperature for 4.2 hours, then release the pressure and cool down, pour out the material, filter to obtain the filtrate and filter residue, and return the filter residue to leaching;

[0060] (3) Add the filtrate obtained in step (2) to adjust the pH of the solution to 2.3, then add ammonium sulfide solution, stir and react for 1.3h, then filter to obtain the first filter residue and the first filtrate, add ammonia to the...

Embodiment 3

[0077] A treatment method for stainless steel scale, characterized in that it comprises the following steps:

[0078] (1) The stainless steel scale is ball milled, and the finely ground material is sieved through 200 meshes, and the sieve is returned to the ball mill;

[0079] (2) Add the sieved material to the sulfuric acid solution, then put it into the autoclave, heat up to a temperature of 210°C in the autoclave, feed sulfur dioxide gas so that the pressure in the autoclave is 6 atmospheres, and then Stir and react at high temperature for 4.5 hours, then release the pressure and cool down, pour out the material, filter to obtain the filtrate and filter residue, and return the filter residue to leaching;

[0080] (3) adding the filtrate obtained in step (2) to adjust the pH of the solution to 2.2, then adding ammonium sulfide solution, stirring and reacting for 1.5h, then filtering to obtain the first filter residue and the first filtrate, and adding ammonia water to the ob...

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Abstract

The invention discloses a stainless steel oxide skin treatment method. A stainless steel oxide skin is subjected to ball milling and screening; the undersize materials is added into a sulfuric acid, the sulfuric acid with the undersize materials is put into a high-pressure reaction kettle, sulfur dioxide is introduced into the reaction kettle for leaching at a high temperature, and then the material is filtered; ammonia water is added into an obtained filtrate to adjust the pH value of the solution, an ammonium sulfide solution is added into the solution to precipitate nickel, ammonia water isadded into an obtained first filtrate to precipitate, the first filtrate is filtered to obtain second filter residues and a second filtrate; after being washed, the second filter residues are mixed with alkali, air is introduced to calcine, the mixture is subjected to fine grinding, and then hot water is added for washing, the hot water with the mixture is filtered to obtain a third filtrate andthird filter residues, the third filtrate is subjected to concentrating and crystallizing to obtain sodium chromate, and the third filter residues are subjected to drying and crushing to obtain iron oxide red; nickel precipitates are added into a sulfuric acid and sodium chlorate to react so as to obtain a nickel sulfate solution, and the nickel sulfate solution is subjected to concentrating and crystallizing to obtain nickel sulfate crystals; and the obtained second filtrate is subjected to concentrating and crystallizing to obtain ammonium sulfate crystals. The method is simple to process, short in flow, high in material recovery rate, low in cost and high in profit.

Description

technical field [0001] The invention relates to a treatment method for stainless steel scale, belonging to the field of waste recycling. Background technique [0002] Stainless steel has many superior properties, and has been widely used as a special steel in life and production. However, in the process of forming stainless steel, it is inevitable to go through different heat treatment processes, such as annealing, quenching, welding, forging, coiling, edging, welding or artificial surface fire heating. There will be a layer of black oxide skin on the surface. The existence of this oxide skin not only affects the appearance quality of stainless steel, but also affects the subsequent processing of stainless steel, so it must be removed before subsequent processing. Stainless steel scale is NiO 2 、Cr 2 o 3 、FeO·Cr 2 o 3 、FeO·Cr 2 O·3Fe 2 o 3 and other dense spinel oxides. [0003] For this part of stainless steel oxide scale, because it contains valuable metals such ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/32C22B23/00
CPCY02P10/20
Inventor 鲍君杰
Owner 鲍君杰
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