KR20150144310A - Composition for sub base with ferronickel slag and the method of manufacturing the same - Google Patents

Abstract

The present invention relates to a sub-base aggregate composition using ferronickel slag and a manufacturing method thereof. Provided are a sub-base aggregate composition using ferronickel slag and a manufacturing method thereof, with respect to 100 parts by weight of the total sub-base aggregate composition, which comprises 50-99.99 parts by weight of converter slag and 0.01-50 parts by weight of ferronickel slag. According to the present invention, provided is a sub-base composition which is easy to be satisfied with a diameter in comparison with the conventional composition, and with excellent bearing capacity of the ground.

Description

Technical Field [0001] The present invention relates to a composition for a loban ash aggregate using ferronickel slag and a method for producing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lozenge aggregate composition using ferronickel slag and a method for producing the same, and more particularly, to a ferroalloy slag composition using ferronickel slag, Nickel slag, and a method of manufacturing the same.

Among conventional steel slag, converter slag is a by-product from the steelmaking process and has an abrasion strength of 25 ~ 30%, which is very high in strength, and is being recycled as a roadside lumber material.

However, the converter slag has a merit that aggregate strength is sufficient, but it is characterized by excessively high aggregate strength, resulting in a low crushing efficiency and high energy cost in the production of aggregate for ligneous materials. For this reason, it is disadvantageous in that the aggregate particle size is not properly adjusted when it is made of the aggregate for the mortar, and the aggregate is produced mainly for the assembled aggregate so that the compaction efficiency is lowered and the bearing capacity is weakened after the loam repositioning.

Therefore, there is a need to develop a rosin material composition and a method for producing the rosin material composition, which can exhibit high performance as a lozenge aggregate, having a high crushing efficiency, easily satisfying standard granular materials for a rosin material, and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a rosin composition and a method for producing the rosin composition.

According to one aspect of the present invention, there is provided a lozenge aggregate composition using ferronickel slag comprising 50 to 99.99 parts by weight of a converter slag and 0.01 to 50 parts by weight of a ferronickel chain slag, based on 100 parts by weight of an entire loam- / RTI >

According to another aspect of the present invention, there is provided a method for producing a slag, comprising: mixing 50 to 99.99 parts by weight of a converter slag with 0.01 to 50 parts by weight of a ferronickel chain slag; And crushing the mixed slag to a size of 20-40 mm in particle size.

According to the present invention, when the ferroalloy slag aggregate is mixed with the existing converter slag lobstart aggregate, disadvantages of converter slag having a wear rate of 25 ~ 30%, that is, an excess of aggregate strength , The crushing efficiency is lowered and the energy cost is increased in manufacturing the aggregate for the rosin material. When the aggregate material is manufactured as the aggregate for the lumber material, the aggregate particle size is not properly adjusted and the aggregate material is produced mainly for the construction. , The crushing efficiency is increased by mixing the ferronickel slag having the low aggregate strength of 70 ~ 75%, and the standard granular aggregate can be stably satisfied.

In addition, since the existing converter slag has an expansion characteristic such as pre-CaO which remains as unreacted CaO used as a steelmaking additive, it can cause expansion bulging phenomenon of the road after the loam rebuilding, The quality of the water-swelling ratio (KS F 2580 steel slag 80 ° C water-swelling test method) is controlled to 1.5% or less by the use of air in the atmosphere, and is used as a raw material aggregate. However, ferronickel slag Since the water swelling ratio is not more than 0.3%, the stability against expansion reaction is better when mixed with conventional converter slag.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart briefly illustrating a method for producing a lozenge aggregate composition according to the present invention.
Fig. 2 shows a particle size distribution curve of a conventional converter slag aggregate for a floor board.
FIG. 3 is a graph showing the particle size distribution curve of a lozenge aggregate composition prepared by mixing a converter slag and ferronickel slag according to the present invention.
Fig. 4 shows the result of measuring compressive strength to evaluate the degree of compaction of the lozenge aggregate composition according to the mixing ratio of converter slag and ferronickel slag.

Hereinafter, the present invention will be described more specifically with reference to the drawings.

The present inventors have unexpectedly discovered that when the furnace slag is manufactured by mixing the conventionally used converter slag with the ferronickel slag produced in the production of ferronickel, the grain size is more easily satisfied and the ground supporting force is superior to the conventional one Thereby completing the invention.

In order to supply Ferronickel, which is used as a raw material in the production of stainless steel among steel products, a ferronickel smelter has recently been established in Korea and has a production capacity of 150,000 tons (net nickel 30,000 tons). In the production method, Ni ore is subjected to reduction treatment of Ni ore by using coke or the like in an electric furnace type furnace using Ni ore, and the ferrite produced at this time is ferronickel slag. Ferronickel slag is produced in a volume of about 1 million tons per year, which is produced by water chain and slow cooling method.

Conventional steel slag, that is, blast furnace slag and steel making slag, is composed of CaO and SiO ₂ components, whereas the main component of ferronickel slag is composed of 25 ~ 40 wt% MgO and 45 ~ 60 wt% SiO ₂ It is characterized by crystallization on Enstatite (MgO · SiO ₂ ) phase and Forsterite (2MgO · SiO ₂ ) according to the cooling method.

Since the ferronickel sponge slag discharged by the slow cooling method is massive in shape and is produced through a high temperature melting step of 1500 ° C. or higher, the slag is highly environmentally harmful and therefore highly utilizable as an aggregate for roving lumber. However, The abrasion rate is 70 ~ 75%, and the strength of the aggregate is very low, so it does not meet the reference properties as the raw aggregate.

Conventional converter slag may cause expansion bulging phenomenon of the road after reconstruction because it has expansion characteristic such as pre-CaO that CaO used as steelmaking additive remains unreacted. Therefore, it is usually used as raw material aggregate after 3 ~ 6 months in the atmosphere, so that the final water swelling ratio (KS F 2580 steel slag 80 ° C water immersion test method) is controlled to 1.5% or less. However, the ferronickel slag has a water swelling ratio of 0.3% or less even if it does not undergo a separate field maintenance period. Therefore, when mixed with conventional converter slag, stability against expansion reactivity is better, which is advantageous in manufacturing raw aggregate.

Accordingly, the present invention is characterized in that it comprises 50 to 99.99 parts by weight of converter slag and 0.01 to 50 parts by weight of ferronickel slag as a lozenge aggregate composition.

Ferro-nickel slag to be used in the present invention is a slag using a Ni ore occurs when producing a ferro-nickel to reduction treatment to Ni ore with coke, such as in the form a of the electric furnace, in general, SiO ₂ of 40 to 70% by weight , 20 to 40 wt% of MgO, 0.01 to 5 wt% of CaO, 0.01 to 5 wt% of Al ₂ O ₃ , and 1 to 10 wt% of FeO.

Further, the above-mentioned lozenge aggregate is not particularly limited, but preferably has a particle size distribution satisfying the standard grain size of 20-40 mm. More preferably, the lozenge aggregate has a particle size distribution satisfying an aggregate standard size of 20 mm, 25 mm, 30 mm or 40 mm.

In the lozenge composition of the present invention, the content of the ferronickel slag is preferably 0.01 to 50 parts by weight based on 100 parts by weight of the total content of the lozenge composition. When the content of the ferronickel slag is too low to be mixed with less than 0.01 part by weight, the crushing efficiency is lowered and the standard granulometry of the aggregate for roving is not satisfactorily stably satisfactory. When the content is more than 50 parts by weight, The strength of the ash aggregate is lowered and the wear rate is lowered, which is not preferable.

FIG. 1 schematically shows a method for producing a lozenge aggregate composition according to the present invention.

The method for producing an aggregate composition of the present invention comprises mixing 50 to 99.99 parts by weight of a converter slag and 0.01 to 50 parts by weight of a ferronickel slag; And crushing the mixed slag to a size of 20-40 mm in particle size. According to the present invention, the crushing of the slag does not break down the converter slag and the ferronickel slag, respectively, but mixes the two slag to crush the mixed slag. By using the ferronickel slag having a relatively low strength in this way, the crushing efficiency can be increased and the energy cost can be lowered, so that the particle size of the aggregate for the lumber material can be easily controlled.

The reason why the mixing ratio of the converter slag and the ferronickel slag is limited as described above is as described above.

In addition, the ferro-nickel slag is used to include a SiO ₂ 40 to 70 wt%, MgO 20 to 40 wt%, CaO 0.01 to 5% by weight, Al ₂ O ₃ 0.01 to 5% by weight, FeO 1 to 10% by weight .

The rosin composition according to the present invention can be used for the base layer and the auxiliary layer of the road furnishing.

Hereinafter, the present invention will be described in more detail by way of examples.

<Examples>

Comparative Example  One

Crushing and particle size were adjusted to 40 mm standard particle size as aggregate for mortar using only converter slag as the conventional method. Five samples of the manufactured aggregate were selected and the particle size distribution curve was compared with the standard particle size distribution curve of the 40 mm aggregate for the auxiliary layer. The results are shown in FIG.

As shown in FIG. 2, when 40 mm thick rebar aggregate was produced using only converter slag, it was found that the standard particle size distribution curve of the 40 mm aggregate for the auxiliary layer was deviated from the range of the standard particle size distribution curve.

Example  One

The converter slag and the ferronickel slag were crushed to conform to the standard grain size of 25 mm aggregate of &quot; KS F 2535 road steel slag &quot; as shown in the following Table 1, and mixed with different mixing ratios as shown in Table 2, A re-aggregate composition was prepared. The aggregate abrasion rate was tested for the prepared rosin aggregate composition.

25mm size specification Percent composition by size (%) 13 ~ 25mm 28.5 5 to 13 mm 23.5 2.5 to 5 mm 10.5 0.4 to 2.5 mm 17.5 0.08 to 0.4 mm 14 0 to 0.08 mm 6 gun 100

The abrasion rate test was carried out in accordance with "KS F 2508 Los Angeles Tester for Wear Test of Coarse Aggregate". The evaluation method was to sample and dry converter slag and ferronickel slag of 5 ~ 13 mm, A total of 5000 ± 10 g was added. At this time, the abrasion test apparatus was rotated 500 times at a speed of 30 to 33 RPM by putting 3,330 ± 25 g of steel ball 8ea. After the completion of the rotation, the sample was taken out and the mass of the sample remaining in the 1.7 mm sieve was measured. The calculation formula for calculating the wear rate is as follows.

[Formula 1]

Wear rate (%) = [(M1-M2) / M1] 100

(M1: mass of sample before injection, M2: amount of sample remaining in 1.7 mm sieve after test)

The results are shown in Table 2 below.

division Steel slag Ferronickel slag Wear rate (%) Mixing rate (%) 100 0 29.6 70 30 35.8 50 50 45.9 30 70 60.4 0 100 74.5 KS F 2535 for road
Steel slag abrasion standard - - Less than 50

As can be seen from the above Table 1, the abrasion rate is generally 50% or less based on the rosin content, but when the content of the ferronickel slag exceeds 50% of the total weight, the abrasion rate is 50% or more, .

Example  2

Since it is necessary to evaluate the range of grain size to be satisfied when manufacturing the lozenge aggregate by mixing the converter slag and the ferronickel slag, crushing and grain size were adjusted to 40 mm standard grain size as the aggregate for the ligneous material. At this time, the mixing ratio of the converter slag to the ferronickel slag was 100: 0, 70:30, 50:50, 30:70, and 0: 100. The results are shown in Fig.

As shown in Fig. 3, it was confirmed that the mixing ratios of the converter slag and the ferronickel slag were 70:30 and 50:50, respectively, stably included in the upper limit and lower limit of 40 mm standard particle size.

Example  3

It is necessary to evaluate the degree of compaction in the production of raw waste aggregate by mixing converter slag and ferronickel slag. For the evaluation method, "KS F 2312 soil compaction test method" was applied. First, the mixture ratio of converter slag and ferronickel slag was set to 100: 0, 70:30, 50:50, 30:70, 0: 100 to prepare a 25 mm thick rebar aggregate. Optimum water content was adjusted to 6 ~ 7% level. After storing for 24 hours, ½ × 20cm sample was placed in Ø10 × 20cm mold and compaction was carried out 92 times by using 4.5kg automatic rammer. The molds filled with the slag samples were cured for 28 days, 80 days and 180 days in a wet chamber at an ambient temperature of 95% relative humidity and a temperature of 20 ° C, and then the compressive strength was evaluated. The compressive strength was measured by a dedicated compressive strength tester of 30 tons capacity according to the KS F 5105 test method (compressive strength test method of hydraulic cement mortar). The measurement results are shown in Fig.

As shown in FIG. 4, the compressive strength was measured to evaluate the degree of compaction. As a result, the mixing ratio of the converter slag and ferronickel slag was 70:30> 50:50> 30:70> 100: 0> 0: Respectively. Therefore, compaction of the converter slag and ferronickel slag was evaluated better than that of the converter slag alone.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention.

Claims (4)

50 to 70 parts by weight of a converter slag and 30 to 50 parts by weight of a ferronickel sponge slag, based on 100 parts by weight of an aggregate total aggregate composition,
Wherein the aggregate has a particle size distribution satisfying the standard particle size of 30 to 40 mm.
The method of claim 1, wherein the ferronickel sponge slag comprises 40 to 70 wt% SiO ₂ , 20 to 40 wt% MgO, 0.01 to 5 wt% CaO, 0.01 to 5 wt% Al ₂ O ₃ , 1 to 10 wt% Wherein the aggregate composition comprises:
Mixing 50 to 70 parts by weight of the converter slag and 30 to 50 parts by weight of the ferro nickel spent slag, based on 100 parts by weight of the total freeboard aggregate composition; And crushing the mixed slag. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
4. The method of claim 3 wherein the ferro-nickel lump ore slag SiO ₂ 40 to 70 wt%, MgO 20 to 40 wt%, CaO 0.01% to 5% by weight, Al ₂ O ₃ 0.01 to 5% by weight, FeO 1 to 10% by weight Wherein the molten slag is a granular slag.

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