JPS6239683A - Abradant and production thereof - Google Patents

Abstract

PURPOSE:To obtain a high-quality abradant comprising ferrochromium slag as a main component, by grinding roughly bulky ferrochromium slag, removing a metallic component and classifying the residue. CONSTITUTION:Bulky ferrochromium slag is roughly ground and magnetically selected by the magnetic ore separators 11a, 12, 13, 24 and 25. Then, the ferrochromium slag is further crushed by the impact crushers 14 and 15. Then, a metallic component is removed from the crushed ferrochromium slag by the magnetic ore separator 16a and the residue is classified by the classifying machine 16 into each desired particle size, to give the aimed abradant which is crushed into <= desired particle size and from which the metallic component is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an abrasive material whose main raw material is ferrochrome slag, and a method for manufacturing the abrasive material.

[Conventional technology]

-g, ferrochrome slag contains 5ift at 28-29% by weight, 11g0 at about 36-37% by weight, ^1203 at about 21-23% by weight, CaO at about 1.8-2.0% by weight,
It contains about 4 to 6.5% by weight of CrO1, and the minerals it contains are mainly spinel (MgO・Alt(h)), forsterite (2MgO・SiO□), enstatite (Fe(lsiot), Magnesioferrite (M
gO-FezO1), healthinite (FeO・AhOs
), it is a heavy, hard, and stable substance with almost no natural disintegration, but it is not used effectively and most of it is disposed of in landfills.

[Problem that the invention seeks to solve]

On the other hand, natural abrasives (diamond, corundum, emery, etc.) have traditionally been used as raw materials for abrasives, but due to resource shortages, artificial abrasives (alumina, carborundum, etc.) are also being manufactured. .

However, since most of these artificial abrasive materials are not produced as by-products of the manufacturing process, they have a problem in that they are relatively expensive.

Therefore, it is conceivable to manufacture the above-mentioned abrasive material from the slag produced in the steelmaking process, but it is difficult to use it because the slag produced in the steelmaking process contains metal components. It was development.

The present invention was made in view of these circumstances, and aims to effectively utilize ferrochrome slag that is disposed of in landfills, and also to provide a high-quality abrasive material and a method for manufacturing the same by utilizing the excellent properties of this ferrochrome slag. The purpose is to provide

[Means to solve problems]

The abrasive according to the present invention, which achieves the above object, is composed mainly of ferrochrome slag that has been crushed to a predetermined particle size or less and from which metal components have been removed.

Here, the term ferrochrome slag as the main component includes the case where the ferrochrome slag is 100%.

The method for manufacturing an abrasive material in accordance with the above purpose includes the first step of coarsely crushing lumpy ferrochrome slag and magnetically separating it.
a second step of further crushing the ferrochrome slag, and a third step of removing metal from the ferrochrome slag treated in the second step and classifying it into predetermined particle sizes using a classifier. It is configured.

In the second step, a normal crusher such as a rod mill may be used to crush the ferrochrome slag, but crushing the ferrochrome slag with a loft mill may result in a foil-like shape. It is preferable to use an impact crusher that does not turn the raw material into foil.

Further, in the third step, the metal content of the ferrochrome slag is removed and the ferrochrome slag is classified, but any order of these operations may be performed first.

Furthermore, if the final product ferrochrome slag contains metal, the finish of the polished surface may become uneven due to differences in hardness, so in order to reduce the metal content as much as possible, we As the lumpy ferrochrome slag, it is preferable to use ferrochrome slag that is obtained by receiving the slag discharged from the electric furnace in a ladle that receives a plurality of overflowing slags to reduce the metal content in the ferrochrome slag.

[Effect]

Next, the operation of the present invention will be explained.

This ferrochrome slag is hard (Mohs hardness 7-8)
It has strong stickiness, and since the metal content has been removed and the quality is uniform, it is an excellent abrasive that does not leave scratches on the polished part.

Next, in the manufacturing method, first, the ferrochrome slag roughly crushed in the first step is subjected to magnetic separation treatment to remove most of the metal content.

Then, the ferrochrome slag from which the metal content has been removed is further crushed in a second step. In this case, by using an impact crusher as the crusher, the crushed ferrochrome slag is turned into particles.

Next, in the third step, the ferrochrome slag is removed from the isolated metal components produced by crushing, so the ferrochrome slag contains almost no metal components, and is classified using a vibrating sieve, etc. It becomes an abrasive material with a particle size distribution of , and can be used according to the purpose.

In addition, in the third step, if the metal content is removed from the ferrochrome slag by metal sorting means such as a magnetic separator, specific gravity separator, or color separator, then the classification process is performed.
The advantage is that only one metal sorting device is required,
When employing specific gravity sorting means as the metal sorting means, it is possible to perform specific gravity sorting most effectively by performing specific gravity sorting after classification.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a plan view of an abrasive manufacturing facility employing an abrasive manufacturing method according to an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a diagram employing the above embodiment. FIG. 2 is a partially cutaway side view of an impact crusher that constitutes an abrasive manufacturing facility.

As shown in FIGS. 1 and 2, an abrasive manufacturing equipment 10 employing an embodiment of the present invention includes a magnetic separator 11 that removes metal from ferrochrome slag conveyed by a conveyor 11a.
, a conveyor 122.13 that conveys the ferrochrome slag from which the metal content has been removed by the magnetic separator 11, an impact crusher [14, 15] which is an example of a crusher that crushes the ferrochrome slag, and crushing by the impact crusher 14, 15. The apparatus includes a magnetic separator 16a, which is an example of metal sorting means for removing metal from the ferrochrome slag, and a classifier 16. These will be explained in detail below.

The ferrochrome slag crushed by a show crusher and a rondo mill, which are examples of crushers (not shown), is crushed by a magnetic separator 1.
After the metal content is removed in step 1, it is transported by a conveyor 12.13, stored in a temporary storage tank 17, and then thrown into one of the impact crushers 14.15.

As shown in FIG. 3, the impact crusher 14 (the same applies to the impact crusher 15) includes a rotor 19 to which an impact plate 18 is attached, which is rotationally driven by a motor 17a, and a casing 20.
The ferrochrome slag is fixed inside the rotor and receives the raw material ferrochrome slag blown from the rotor.The ferrochrome slag introduced from the raw material input port 22 is crushed into particles by sequentially colliding with the collision plate. The structure is such that it is discharged from the discharge port 23.

In addition, in FIG. 3, what is indicated by 20a is a dust collection hood, and what is indicated by 20b is a raw material supply pipe.

The ferrochrome slag processed by the impact crusher 14.15 is transferred to the magnetic separator 1 by a conveyor 24.24a.
6a, metal components are removed, and then conveyed to the classifier 16 by the conveyor 25.

This classifier 16 is composed of a vibrating sieve 26 and a vibrating sieve 27, and the ferrochrome slag is separated by the vibrating sieve 26 into particles having a particle size of 2.8 or more (the unit is 1, the same applies hereinafter), 2.8 to 1.
Classified as 8.1.8 or below. The ferrochrome slag of 2.8 or more is discharged to the outside and conveyed by the conveyor 28 to the conveyor lla on which the original ferrochrome slag is placed, and the ferrochrome slag of 2.8 to 1.8 is transferred to the lower sub-tank 28a. stored. On the other hand, 1.
The ferrochrome slag of 8 or less is conveyed to the vibrating screen 27 by the conveyor 29.30, and the ferrochrome slag is 1.8~0.8.
It is classified as below 0.4.0.4. Here, 1.8 to 0
．． The ferrochrome slag of 0.8 to 0.4 is transported by the conveyor 31 and stored in the sub-tank 32, and the ferrochrome slag of 0.8 to 0.4 is stored in the sub-tank 33. By the way, some of the ferrochrome slag of 0.4 or less is stored in the sub-tank 34, and then, together with the ferrochrome slag dust collected by the dust collector 35, the conveyor 28 carries the original ferrochrome slag.
After going through the above steps, the abrasive particles with a particle size of 2
．． A ferrochrome slag of 8-1°8.1.8-0.8.0.8-0.4 is produced.

Next, Table 1 shows the physical properties of the ferrochrome slag produced through the above steps. .

As shown in Table 1, it can be seen that the ferrochrome slag produced by the above method is a hard and highly abrasive material.

Additionally, Table 2 shows the results of the hazardous substance elution test according to Environment Agency Notification No. 13.

Table 2 As shown in Table 2 above, it can be seen that no harmful substances are eluted from the ferrochrome slag.

In addition, in the above explanation, it is mentioned that ferrochrome slag is used only as an abrasive material, but since it has the properties shown in Tables 1 and 2 and also has a high degree of fire resistance, it cannot be used in the above manufacturing method. Ferrochrome slag produced by this equipment can be used as foundry sand (preferably with small grain size), and furthermore, because it is hard and has stable properties, it can also be used as a resin filler. be.

〔Effect of the invention〕

As is clear from the above description, the abrasive material according to the present invention uses ferrochrome slag as a raw material of the abrasive material, so that the ferrochrome slag can be used effectively, and the ferrochrome slag is hard, tenacious, and has a metal content. is removed, the quality is uniform and it is possible to provide an abrasive material that does not cause scratches on the polished surface.

Furthermore, as is clear from the above description, the method for manufacturing the abrasive material according to the present invention uses ferrochrome slag as a raw material, and the ferrochrome slag is roughly crushed, subjected to magnetic separation treatment to remove the metal content, and further crushed to remove the metal content. Since we are removing
This makes it possible to provide an abrasive material made from ferrochrome slag with an extremely low metal content.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an abrasive manufacturing facility employing an abrasive manufacturing method according to an embodiment of the present invention, and FIG. 2 is a side view of the same.
FIG. 3 is a partially cutaway side view of an impact crusher constituting an abrasive manufacturing facility employing the above embodiment. [Explanation of symbols]

Claims (4)

[Claims] (1) An abrasive whose main component is ferrochrome slag that has been crushed to a predetermined particle size or less and from which metal has been removed. (2) A first step of roughly crushing the lumpy ferrochrome slag and magnetic separation treatment, a second step of further crushing the ferrochrome slag, and removing metal from the ferrochrome slag treated in the second step, and classifying the ferrochrome slag. A method for producing an abrasive material, comprising a third step of classifying the particles into predetermined particle sizes using a machine. (3) In the second step, the treatment of crushing the ferrochrome slag is performed by an impact crusher.
A method for manufacturing the abrasive material described in Section 1. (4) The lumpy ferrochrome slag in the first step is
The method for producing an abrasive according to claim 2 or 3, which is ferrochrome slag in which the metal content is reduced by receiving ferrochrome slag discharged from an electric furnace using a plurality of ladles and gradually overflowing the ferrochrome slag. .