KR101715813B1 - method of manufacturing shot grit using nikel slag - Google Patents

method of manufacturing shot grit using nikel slag Download PDF

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Publication number
KR101715813B1
KR101715813B1 KR1020150139472A KR20150139472A KR101715813B1 KR 101715813 B1 KR101715813 B1 KR 101715813B1 KR 1020150139472 A KR1020150139472 A KR 1020150139472A KR 20150139472 A KR20150139472 A KR 20150139472A KR 101715813 B1 KR101715813 B1 KR 101715813B1
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KR
South Korea
Prior art keywords
nickel slag
particle size
group
weight
crushing
Prior art date
Application number
KR1020150139472A
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Korean (ko)
Inventor
김중권
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(주)에스알
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Priority to KR1020150139472A priority Critical patent/KR101715813B1/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1409—Abrasive particles per se
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1436—Composite particles, e.g. coated particles

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Composite Materials (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a method for producing a polishing material using nickel slag, the method comprising the steps of: crushing nickel slag produced as a by-product when refining nickel, screening the same to produce a first nickel slag group having a particle size between 0.5 mm inclusive and 1.0 mm exclusive, and selecting and extracting a second nickel slag group having a particle size between 1.0 mm inclusive and 1.5 mm inclusive; and mixing together, among the selected nickel slag, 57-63 wt% of the first nickel slag group having a particle size between 0.5 mm inclusive and 1.0 mm exclusive, and 37-43 wt% of the second nickel slag group having a particle size between 1.0 mm inclusive and 1.5 mm inclusive, and providing the same for polishing. According to the method for producing a polishing material using nickel slag, it is possible to remove welding flux from the welded part and smoothly polish the welded surface at the same time through a single spray of the polishing material.

Description

Technical Field [0001] The present invention relates to a method for manufacturing an abrasive using nickel slag,

The present invention relates to a method of manufacturing an abrasive using nickel slag.

A dry polishing method widely used for grinding a surface of a workpiece by spraying abrasive particles on the surface of the workpiece at a high speed to remove contaminants adhering to the surface of the workpiece or to improve the surface characteristics of the workpiece by applying an impact force to the surface of the workpiece There is a sand blast method.

Sand particles are used as an abrasive mainly used in such a sandblast surface treatment method, and Korean Patent Laid-Open No. 10-2006-0055911 discloses a method of removing a coating film using sand particles.

Meanwhile, in recent years, various ways of recycling the by-products generated in the smelting process have been studied. In response to such recycling measures, the smelting by-product can be used as an abrasive material to improve polishing efficiency instead of sand particles as a natural inorganic abrasive Is required.

In addition, there is a demand for a method capable of simultaneously removing the welding flux on the welded portion of the ship manufactured through the welding process at the shipyard and simultaneously polishing the welding surface by a single abrasive spraying.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a process for removing a welding flux on a welded portion and polishing the welded surface uniformly while treating a by- And an object of the present invention is to provide a method of manufacturing an abrasive using nickel slag which can be treated by abrasive spraying.

In order to accomplish the above object, according to a method of manufacturing an abrasive using a nickel slag according to the present invention, A first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm selected by screening and a second group nickel slag having a particle size of 1.0 mm or more and 1.5 mm or less, Respectively; I. 57 to 63% by weight of the first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm among the selected nickel slag and 37 to 43% by weight of the second group nickel slag having a particle size of 1.0 mm or more and 1.5 mm or less % To each other for polishing.

The second step is preferably performed by mixing 60 wt% of the first group nickel slag and 40 wt% of the second group nickel slag.

The crushing step is performed by first and second crushing rollers provided opposite to each other and rotating in opposite directions to crush the nickel slag. The first crushing roller and the second crushing roller are respectively made of a steel body Wow; Wherein the coating layer comprises C 4.64 wt%, Si 1.21 wt%, Mn 0.55 wt%, Cr 22.23 wt%, Mo 2.98 wt%, Nb 3.06 wt%, V 0.47 wt%, and the coating layer coated on the surface of the body. 0.18% by weight of B, 0.28% by weight of Ti, 0.18% by weight of Zr, 0.032% by weight of P, 0.020% by weight of S, and the balance of iron.

Also, the coating layer is formed such that a plurality of arc-shaped portions having an arc shape gradually increasing in outer diameter along the circumferential direction and then decreasing gradually are connected repeatedly along the circumferential surface of the body, the arc-shaped portion having a width of 7 to 8 mm, The height of the highest position from the body is 3 to 5 mm.

According to the method for manufacturing an abrasive using the nickel slag according to the present invention, the process of removing the welding flux on the welded portion and polishing the welded surface uniformly can be performed by a single abrasive spraying.

1 is a process diagram showing a method of manufacturing an abrasive using nickel slag according to the present invention,
2 is a cross-sectional view of the crushing roller applied to the crushing process of FIG.

Hereinafter, a method of manufacturing an abrasive using nickel slag according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a process diagram showing a method of manufacturing an abrasive using nickel slag according to the present invention, and FIG. 2 is a cross-sectional view of a crushing roller applied to the crushing process of FIG.

The method of manufacturing an abrasive using the nickel slag according to the present invention is characterized in that the nickel slag, which is a by-product generated in the smelting of nickel, is first crushed (step 10), and the crushed nickel slag is screened by a screen having a net shape to have a particle size of 0.5 mm to 1.5 mm (Step 20).

In the screening process, a first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm and a second screen (not shown) using a first screen (not shown) The second-group nickel slag is independently selected.

Then, among the selected nickel slag, a first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm and a second group nickel slag having a particle size of 1.0 mm or more and 1.5 mm or less are mixed with each other (Step 30).

Here, 57 to 63% by weight of the first group nickel slag and 37 to 43% by weight of the second group nickel slag are mixed and provided for polishing.

More preferably, 60 weight percent of the first group nickel slag and 40 weight percent of the second group nickel slag are mixed and provided for polishing.

The nickel slag preferably has a Beikers hardness of 700 to 750 Hv.

Nickel slag is typically SiO 2 46 to 56 wt%, Fe 2 O 3 4.3 to 4.9 wt.%, CaO 0.6 to 7.9 wt.%, MgO 33 to 35.5 wt.%, And the balance K 2 O, Na 2 O.

The crushing process is performed by crushing the first and second crushing rollers 40a and 40b, which are opposed to each other and rotate in opposite directions to crush the nickel slag.

Each of the first and second crushing rollers 40a and 40b includes a body 41 and a body 42 made of Fe and a body 41 and 42 on the surfaces of the bodies 41 and 42 And a coating layer 43 which is coated with a coating material.

The coating layer 43 is formed of a material whose hardness is higher than that of iron and whose abrasion is suppressed so as to suppress abrasion by the nickel slag 50 during the crushing process of the nickel slag 50.

The coating layer 43 contains 4.64 wt% of carbon (C), 1.21 wt% of silicon (Si), 0.55 wt% of manganese (Mn), 22.23 wt% of chromium (Cr), 2.98 wt% of molybdenum (B) 0.18 wt.%, Titanium (Ti) 0.28 wt.%, Zirconium Zr 0.18 wt.%, Phosphorus (P) 0.032 wt.%, Sulfur (S) 0.020 wt.%, Vanadium (V) , And the remainder is formed of iron (Fe).

The arc-shaped portion 44 of the arc-shaped portion 44 of the first and second crushing rollers 40a and 40b is gradually reduced in thickness along the circumferential direction, And a plurality of the first and second end portions are repeatedly connected to each other along the circumferential surface.

The arcuate portion 44 is preferably formed to have a width d of 7 to 8 mm and to have a curvature from the body 41 and 42 The height h of the center of the arc-shaped portion 44 having the highest height is formed to be 3 to 5 mm.

The height difference s between the height h of the center of the arcuate portion 44 and the valley of the edge is 0.2 to 0.5 mm.

Further, the distance between the first and second crushing rollers 40a and 40b is 0. to 1.5 mm, preferably 1 mm, and the crushing is performed.

It is preferable that the first and second crushing rollers 40a and 40b rotate at 250 to 350 rpm when the first and second crushing rollers 40a and 40b crush.

The production rate at which the rotational speed of the first and second crushing rollers 40a and 40b is less than 250 rpm is lowered and the crushing efficiency is lowered when the rotational speed exceeds 350 rpm.

On the other hand, a pretreatment process is performed before the crushing process.

The pretreatment process is to remove metal such as iron by using a magnet for nickel slag raw material which is about 1 cm in size and to wash the nickel slag material with water so that the salt used by the sea water used for cooling during nickel smelting process can be removed. And then dried.

The drying process is first dried for 15 minutes in the sunlight, and then the secondary drying is performed at 150 ° C for 15 minutes to 20 minutes in the heat treatment chamber.

After the drying process, a small size of 0.5 mm or less is separated using a bag filter, and the above-described crushing process is performed.

On the other hand, in the first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm in the abrasive mixture of the first group nickel slag and the second group nickel slag, the removal efficiency of the weld bead sludge flux is high, The second-group nickel slag having a particle size has a uniform surface area to improve the coating efficiency in subsequent processes such as painting.

In the mixing ratio of the abrasives, the flux removal efficiency is lowered when the first group is less than 57% of the mixing ratio of the first group and the second group, and when the second group exceeds 43%, the welding is damaged , And if it is 37% or less, the surface treatment is insufficient.

If the particle size of the nickel slag is larger than 1.5 mm, it damages the welded portion formed by the steel plate or the like. If the particle size is less than 0.5 mm, the flux removal and polishing effect are insignificant.

Therefore, as described above, when the abrasive mixed with 60 wt% of the first group nickel slag and 40 wt% of the second group nickel slag is applied to polish the surface before coating the vessel, the foreign matter removal efficiency And excellent surface roughness can be obtained, so that the adhesion of the coating material can be improved during the coating operation.

40a: first crushing roller 40b: second crushing roller
43: Coating layer

Claims (4)

end. A first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm selected by screening and a second group nickel slag having a particle size of 1.0 mm or more and 1.5 mm or less, Respectively;
I. 57 to 63% by weight of the first group nickel slag having a particle size of 0.5 mm or more and less than 1.0 mm among the selected nickel slag and 37 to 43% by weight of the second group nickel slag having a particle size of 1.0 mm or more and 1.5 mm or less % Of the particles are mixed for polishing,
The second and third nickel slag may be mixed together in an amount of 60% by weight of the first group nickel slag and 40% by weight of the second group nickel slag,
Wherein said step of crushing is carried out by first and second crushing rollers provided opposite to each other and rotating in opposite directions to crush said nickel slag,
The first and second crushing rollers
A body made of iron material;
And a coating layer coated on a surface of the body,
The coating layer is composed of 4.64 wt% of C, 1.21 wt% of Si, 0.55 wt% of Mn, 22.23 wt% of Cr, 2.98 wt% of Mo, 3.06 wt% of Nb, 0.47 wt% of B, 0.18 wt% of B, 0.28 wt% of Ti, 0.032% by weight of P, 0.020% by weight of S and the balance of iron,
Wherein the coating layer is formed such that a plurality of arc-shaped portions having an arcuate shape gradually increasing in outer diameter along the circumferential direction and then decreasing gradually are connected repeatedly along the circumferential surface of the body, the arcuate portion having a width of 7 to 8 mm, The height of the highest position from the height is 3 to 5 mm,
Wherein the height difference between the height of the center of the arcuate portion and the valley of the edge is 0.2 to 0.5 mm and the distance between the first crushing roller and the second crushing roller is 1 mm. delete delete delete
KR1020150139472A 2015-10-05 2015-10-05 method of manufacturing shot grit using nikel slag KR101715813B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150093512A (en) * 2014-02-07 2015-08-18 (주)에스알 method of manufacturing shot grit using nikel slag
KR20150098778A (en) * 2014-02-21 2015-08-31 조성식 A Grain grinder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150093512A (en) * 2014-02-07 2015-08-18 (주)에스알 method of manufacturing shot grit using nikel slag
KR20150098778A (en) * 2014-02-21 2015-08-31 조성식 A Grain grinder

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