KR101675941B1

KR101675941B1 - Separation method of limonite and saprorite from nickel laterite ores

Info

Publication number: KR101675941B1
Application number: KR1020150137249A
Authority: KR
Inventors: 김형석; 배인국; 유광석; 서주범; 이병필
Original assignee: 한국지질자원연구원
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2016-11-29
Also published as: WO2017057856A1

Abstract

The present invention relates to a method for mutually separating and selecting limonite and saprolite ores from nickel laterite ores. According to the present invention, the separation method of laterite ores comprises the following steps: separating gangue having a grain size of greater than a first grain size and an intermediate product having a grain size of less than or equal to a second grain size from each other through a particle size separation with respect to laterite ores; removing moisture from the intermediate product; deagglomerating the intermediate product to have a grain size of less than or equal to the second grain size; and allocating the deagglomerated intermediate product to be separated into a first product and a second product. The first product of the separated granulation is classified as a saprolite ore to be used as a raw material of dry refining, and the fine-grain second product is classified as a limonite ore to be used as a raw material of hydrometallurgy.

Description

{Separation method of limonite and saprorite from nickel laterite ores}

TECHNICAL FIELD The present invention relates to a beneficiation technique for improving the quality of raw ore, and more particularly to a beneficiation technique for separating limonite light used as a raw material for wet smelting and saprophyl light used as a raw material for dry smelting.

Nickel is a silver-white metal used as a raw material for stainless steel, special alloy steel, as a raw material for plating, corrosion resistance and heat resistance. Nickel light is largely divided into nickel sulfide ore and nickeliferous laterite ore.

Nickel sulfide light can easily improve nickel quality through physical beneficiation processes such as stage-grinding, gravity separation and flotation, and it will produce 60% of global nickel production in 2011 Was used as raw material. However, due to long-term resource development, economically viable nickel sulfide light is depleted, and interest in nickel latex light, which accounts for more than 70% of total nickel reserves, is increasing.

The nickel latex light consists of limonite, which is mainly composed of iron, and saprolite, which is a silicate mineral. The limonite is located in the vicinity of the surface and is highly weathered and exists in a soil or powder form. The main constituent minerals are goethite, FeO (OH), and the quality is less than 1.5% Ni. While four Pro light light is formed at the surface lower and kept at the same rock type crystalline developed, going control light _{[garnierite, H 2 (Ni,} Mg) SiO 2 · nH 2 O] , and Li die bit (lizardite, Mg ₃ Si ₂ O ₅ (OH) ₄ ) and the product quality is 1.5 ~ 2.5% Ni.

The nickel latex light has the advantage that the quality is uniform and not hardened, and it is close to the surface and the open air development is easy. The largest ganny light deposit in the world is found in New Caledonia, accounting for 30% of the 19,000 km ² islands with an average depth of 20m. The quality of New Caledonia safflowite is Ni 2.5% and the quality of limonite is about 1.6% Ni.

On the other hand, since nickel latex light exists near the surface, it is easy to mined, but since nickel component is substituted by minerals, it is difficult to separate nickel mineral alone. Therefore, the raw material of latterite does not precede a separate unit separation process but produces nickel by using the raw raw material of latex directly as dry or wet smelting raw material.

The sapporite light is suitable for dry smelting with a nickel content of about 2% or more, and the limonite light is used for producing ferronickel by wet smelting rather than dry smelting because the nickel content is about 1.5% or less.

The problem is that a mixture of limonite and sapphire light appears.

The wet smelting of the limonite begins by dissolving the limonite in the acid. When the sapphire light is mixed with the limonite, which is a raw material of the smelting, the magnesia (basic) Is increased. Furthermore, the disadvantage is that the amount of sludge generated increases due to the silica component, which is an impurity of the saprolite light, thereby increasing the process cost. For this reason, the nickel limonite light should have a total content of Si and Mg of 10% or less and an Fe content of 40% or more, which is suitable for use as a raw material for wet smelting.

However, as described above, the nickel lanternite light has been used as a raw material for wet or dry smelting without any special optical circulation process, and thus the efficiency of smelting has been reduced.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a beneficiation technique for separating limonite and saprophyte from each other. In particular, it is an object of the present invention to provide a beneficiation technique for improving the quality of nickel in limonite light and lowering the water content by focusing and separating saproproite from limonite light.

According to an aspect of the present invention,

A method for separating saverite light and limonite light from lterite raw light, comprising the steps of: (a) separating the gangue of the first grain size exceeding the first grain size and the intermediate product of the first grain size or less from each other step; (b) drying the intermediate product to remove moisture; (c) breaking the intermediate product to a second particle size or less; And (d) classifying the shredded intermediate product into a first product and a second product.

In the present invention, the step (a) may include a first separating step using a roller screen, a second separating step of separating the relative fine product calculated in the first separating step on the basis of the first particle size using a Trommelscreen Separation step.

In the primary separation step, the raw material of the lateion is separated on the basis of a particle size of 20 to 30 mm, preferably 25 mm, and in the secondary separation step, the fine product is separated on the basis of a particle size of 5 to 10 mm. Finally, the first particle size may be 5 to 10 mm or less.

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In one embodiment of the present invention, the second grain size of step (c) ranges from 1 to 3 mm, preferably 1 mm. The crushing may be carried out by using an impact mill including one or a combination of a pin mill, a hammer mill, and a jet mill, and performing the crushing by impact.

On the other hand, the first product and the second product discharged through classification in the step (d) have a particle size range of 0.3 to 1.0 mm. More specifically, the first product and the second product have a particle size distribution curve D10 (upper 10% of cumulative distribution) and D90 (lower 90% of cumulative distribution).

In another embodiment of the present invention, after step (d), the product of the third particle size or less through the dry cyclone group can be removed from the second product which is relatively fine particles. Here, the third grain size is in the range of 0.045 to 0.0074 mm, preferably 0.074 mm.

The first product separated through the above-described process is classified as a saprophyte light and is used as a raw material for dry smelting, and the second product is classified as a limonite light and can be used as a material for a subsequent smelting process as a raw material for wet smelting.

According to the present invention, it is possible to separate the limonite light and the saprolite light from the laterite light through a very simple process including drying, crushing (crushing) and dry classification. Accordingly, it is possible to separate the sapporite light mixed in the low-quality limonite light ore and obtain the improved limonite light. Furthermore, when the contents of the limonite light and the saproproylite are similar, they can be separated and supplied as a raw material for the wet smelting and the dry smelting.

Particularly, it is possible to remove the magnesia (basic) which hinders the acid leaching action when the limonite light is wet-smelted by separating the saponite light from the limonite light, and it is possible to reduce the amount of residues such as silica, There is an advantage that wet smelting is possible.

FIG. 1A is a schematic flow chart of a method of selecting a latex optical separation according to an embodiment of the present invention.
FIG. 1B is a schematic flowchart of a method for selecting a latex optical separation according to another embodiment of the present invention.
Fig. 2 is a table showing the particle size distribution of the nickel neat lecithin raw material used as a sample in the experiment of the present invention.
3 is a flow chart showing an experimental procedure for the present invention.
4 is an XRD pattern of a sample of nickel ceratonite primary crystallized from New Caledonia.
The table in Fig. 5 shows the chemical composition according to the particle size distribution of the sample of the nickel ceratalite fresh calcodonite source.
6 is a table showing the chemical composition and content of nickel latex samples.
The table in Fig. 7 shows the chemical composition and water content according to the particle size and fraction of coarse, fine and ultra fine after two dry classification.
FIG. 8 is a table showing the chemical composition and content of a sample of nickel rheerite raw (dry) light.
The table in FIG. 9 shows the chemical composition and water content according to the particle size and fraction of coarse, fine and ultra fine after dry classification two times with respect to the dried light sample .

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to separation of saprophyl light and limonite light from latterite light which is nickel oxidation light.

Particularly, when the limonite light is dominant, it separates and removes the saprophyte light from the laterite light to improve the quality of the limonite light and to make it more suitable for wet smelting. That is, in wet smelting, it is necessary to dissolve all the metals in the limonite light by using an acid, since the saprophylite contains basic magnesia, which makes acid leaching difficult. In addition, since saprophylite contains a large amount of silica as a silicate mineral, it is difficult to treat the residue due to silica remaining after acid leaching. Further, acid leaching is advantageous as the grain size is small, and sapphireite is made of crystalline material, so that a large amount of energy is consumed in order to reduce the grain size. As a result, it is an important factor for improving the quality of the remontrate light as a raw material for the wet smelting to remove the soprolite light as much as possible from the laterite light.

Accordingly, the present invention provides a method for separating and removing saprophytic light from the latex light when the far ultrium light is dominant in the latex light.

However, the present invention is not limited to the case where the limonite light is dominant in the laterite light, and can also be applied to the case where the limonite light and the soprolite light are similar to each other or the soprolite light is dominant. The technical principle of the present invention is to separate the two materials from each other in the retardite light in which the limonite light and the saproproylite are mixed, so that there may be differences in the detailed processes depending on which components are more prevalent. However, There is no difference in the dimension of.

Hereinafter, with reference to the accompanying drawings, a method of selecting a latex optical separation according to the present invention will be described in a time series sequence.

FIGS. 1A and 1B are schematic flow charts of a method of selecting a latex optical separation according to the present invention. In the case of the embodiment shown in FIG. 1B, there is a difference only in that classification is performed using the cyclone once again after the dry class classification as compared with the embodiment shown in FIG. 1A, but there is no difference in the other parts. After describing the present invention with reference to FIG. 1A, the additional process in FIG. 1B will be described separately.

Referring to FIG. 1A, in the present invention, granite separation is performed on latex light to separate and remove gravel and rock minerals as gangue. Concretely, it is divided into a primary separation step and a secondary separation step. In the primary separation step, a roller screen is used to remove minerals having a particle size in the range of 20 to 30 mm, in this embodiment exceeding 25 mm. In the second separation stage, minerals with a particle size exceeding 5 ~ 10 mm are removed using a Trommel screen for minerals of 25 mm or less. In this embodiment, minerals exceeding 10 mm are removed. This is because large grains larger than 10 mm do not correspond to limonite, and gangue stones are the most common crude rock minerals. As described above, the latex light, especially the limonite light, is in a state in which weathering has progressed much, and thus it is calculated in the form of a ground or powder. Therefore, minerals with a particle size exceeding 10 mm can be treated as gangue minerals. In this embodiment, the grain size of the vase is determined to be 10 mm, but this value is not a predetermined value and may be determined differently depending on the characteristics of the laterite light.

As described above, after separating the lateionite light into a gangue product having a size of more than 10 mm and an intermediate product having a grain size of less than 10 mm, the intermediate product containing nickel is dried. Laterite light is generally produced in a high temperature and high humidity environment in the equatorial region, such as New Caledonia. Therefore, the water content is very high. If the water content is high, the particles adhere to each other to form a mouth-piece, which degrades the efficiency of subsequent particle size classification. Drying can be naturally dried in the atmospheric state or can be carried out by artificially heating. That is, depending on the moisture content level of the intermediate product and the quantitative scale, the drying method can be determined.

After drying, the intermediate product is subjected to shredding. In this embodiment, the decryption includes both of two meanings. One is to crush the intermediate product to a second particle size or less, and the other is to separate the particles by impacting the particles attached to each other. The second grain size is determined in the range of 1 to 3 mm, and is determined to be 3 mm (in the case of omitting the drying process) and 1 mm (in the case of dry light) in the present embodiment. When the second particle size is less than the above range, much energy is consumed in the pulverization, but the efficiency of particle size classification is not greatly increased, which is not preferable. In addition, when the diameter exceeds 3 mm, the crushing energy is consumed to a small extent, but the effect of classifying granules as a subsequent process can not be expected.

Particularly, in the present invention, particle size control through cracking plays a very important role in separating the saprophyte light and the limonite light, which results in a problem of how to determine the second particle size. In other words, if pulverization is performed to a second particle size or less, the products exhibit various particle size distributions below the second particle size, and the particles are divided into relatively coarse particles and fine particle particles below the second particle size. Even when the same crushing energy is applied, the crystal-developed minerals such as saprophylite are not finely crushed compared to the minerals which are considerably weathered like limonite. That is, by optimizing the crushing energy, the limonite and saprophylite can be crushed to be in different particle size ranges. When two minerals are formed in different ranges of grain size, their separation becomes easy. Conversely, when excessive grinding is performed by lowering the particle size standard, the crystalline sapporite luminescence is also pulverized and becomes smaller in particle size, so that it can not be distinguished from the limonite light in particle size. As a result, it is very important to control the degree of crushing so that crystalline sapporite light and weathered limonite light can be formed at different particle sizes. The second particle size range was obtained through a number of experiments on the particle size distribution according to the crushing energy of the saprophyte light and the limonite light. Of course, the theoretical background of the difference in mineralogical or physical properties between the two minerals, and the confirmation of the mineralogical or physical characteristics of the two minerals through experimentation have led to the second range of grain size.

In this embodiment, the crushing can be performed using any one of a pin mill, a hammer mill, and a jet mill or an impact mill, and in this embodiment, a pin mill is used. More specifically, a screen for passing particles having a second particle size or less is provided at an outlet of the pin mill, and the pinch mill is operated.

And dry classification is performed in a state where the particle size of the intermediate product is adjusted to be equal to or less than the second particle size through decoloration. Dry classification refers to a technique of separating the relatively heavy and high-grained product and the relatively light and small-sized product using a classifier in the state of being dried without using water. As described above, intermediate products below the second particle size are mixed with limonite light having a relatively small particle size and saprophyte light having a relatively large particle size. In dry classification, the two minerals are separated.

That is, in the dry type classification, the intermediate product is separated into two groups, that is, a first product as a relative assembling particle and a second product as a relatively fine particle. Both the first and second products have a particle size in the range of 0.3 to 1.0 mm. An assembled product corresponding to D10 (the upper 10% cumulative particle size distribution on the particle size distribution) in the overall particle size distribution including both the first product and the second product is the first product and the remaining D90 (the lower 90 in the particle size distribution) % Cumulative particle size distribution) is the second product.

In the present embodiment, a dry classifier may be a static classifier, a cyclone, or the like. The most important point when performing classification using a dry classifier is the rate at which the product is fed to the cyclone. This is because the products that are separated by speed are different. In the present invention, dry classification conditions for separating the limonite light and the soprolite light from the intermediate products decomposed by the pin mill are found through a number of experiments. That is, in the first dry classification, the linear velocity is adjusted to 3,000 to 4,000 rpm to supply the intermediate product to the classifier. Light and small particles overflow to the top of the classifier, while heavy and heavy particles are underflowed to the bottom of the classifier.

Heavy particles (primary product) discharged downward from the dry classifier were found to be mainly saprophite minerals as assembled minerals, which can be classified as raw materials for dry smelting and put into subsequent processing.

The second crops discharged to the upper part of the dry classifier were found to be mainly limonite minerals as relatively fine minerals, which can be classified as raw materials for wet smelting and used in subsequent smelting processes.

As described above, in the present invention, the minerals and the physical features of the two minerals, namely, the limonite and the saProite, can be used to separate them.

Meanwhile, in the embodiment shown in FIG. 1B, in addition to the process of FIG. 1A, dry classification is again performed on the second product. Can be carried out using a cyclone. The second class focuses primarily on the separation of ultra-fine particles. In this example, D90 separates superfine products in the particle size range of 0.045 to 0.074 mm, more preferably less than 0.074 mm.

On the other hand, in the present invention, it is advantageous to use a classifier using airflow such as static classifier or cyclone group rather than sieving. This is because the water content of the product decreases during the classification process through the cyclone. That is, since the particles are rotated at a high speed within the cyclone, a dehydration effect is obtained, and the moisture content of the particles discharged from the cyclone is lowered. In the case of the second product, it is used as a raw material for wet smelting. In order to increase the efficiency of acid leaching in wet smelting, it is advantageous that the products (particles) are separated from each other without being clumped together. If the water content decreases, the separability of the particles improves.

The method for separating and sorting according to the present invention described above can be roughly divided into particle separation, drying, crushing, and dry classification. The above separation techniques are widely used in the field of mining for a long time, and the technical principles are already known. Therefore, it is not the technical principle that is important in the optics technology, but rather the conditions under which each individual technology element is operated. And to characterize the separation object to determine these conditions.

That is, according to the present invention, the minerals particle size is determined on the basis of the mineralogical difference between the two minerals, and the condition of the cyclone group is determined with respect to the crushed particles so that the minerals are separated from each other. That is, the technical core of the present invention should be found not in the large category dimensions of crushing and dry classification but in determining the conditions of crushing (crushing) and dry classification.

Particularly, in the present invention, the determination of the particle size in the crushing process and the condition of the air stream when operating the dry type classifier are essential factors. Determination of grain size in the crushing process (in other words, determination of the degree of crushing) is a reflection of the crushing characteristics of the two minerals to be separated. And the velocity condition of dry classifier in dry classifier is optimized to separate two minerals according to grain size. In the present invention, it is possible to effectively separate the rational light and the soprolite light from the rasterite light through the process described above.

The inventors of the present invention conducted a study on the possibility of using New Caledonia Nickelate Lite as a raw material for wet smelting by using the present invention.

Specifically, the mineralogical characteristics and chemical composition of New Caledonia Nickelateite in New Caledonia, which is supplied in Korea, were analyzed, and based on the characteristics, a beneficiation process consisting of drying (dehydration), crushing and dry classification was carried out to separate nickel remonite light .

This will be described in detail below.

1. Samples and Experimental Methods

1.1 Sample

The nickel latex light used in this experiment is obtained from the Nakety mine of New Caledonia, NMC (Nickel Mining Company). The table in Fig. 2 shows the particle size distribution of nickel calderonate light. In case of New Caledonia nickel latex light, particle size is more than 5 mm and particle size is 32 ~ 38 mass% compared to the whole sample. In this experiment, nickel latex light with a particle size of 5 mm or less was used to separate nickel remonite light which can be used as a raw material for wet smelting.

1.2 Experimental Method

Dry classification for separating the limonite light for nickel rheerite ore (-5 mm particle size, water content 23%) and dried nickel linterrite (-5 mm particle size, moisture content 9%) dried at 105 ° C for 24 hours (Fig. 3). The nickel latex light having a particle size of 5 mm or less was pulverized with a pin mill as an impact grinder. Due to the high water content, the nickel nitride ore was crushed to a size of less than 3 mm and the dried nickel linterite was crushed to less than 1 mm. After that, the dry flow was firstly classified using a dry cyclone (HEYNAU, HTRIEB), and the underflow was recovered. The overflows obtained in the first dry classification were reclaimed under underflow and overflow after re-classification (second dry classification) with varying dry cyclone operating conditions. The chemical composition and moisture content of the raw samples (nickel latterite, nickel latex) and classified products (coarse, fine and microparticulate) injected into the classifier were analyzed to determine the separation efficiency of the minerals by dry classification. Drying effect.

2. Results and discussion

2.1 Characterization of nickel nitride photoluminescence

As shown in the table of FIG. 2, the particle size of not less than 25 mm in diameter of the nickel cerateite raw material of New Caledonia accounts for 17 to 18% of the total content. Particles with a diameter of 25 mm or more are mostly crude rock minerals, which increases the amount of final sludge generated by the wet process and increases the unit process cost. Therefore, in this study, mineralogical composition and chemical composition according to grain size were analyzed by using XRD and XRF, respectively.

FIG. 4 shows an X-ray diffraction pattern according to the particle size. At 13 ~ 25 mm particle size, Lizzardite peak, the main constituent mineral of saprophytes, was identified. The goethite and willem site, major constituent minerals of the limonite, were identified at the grain size of less than 5 mm in diameter. As described above, the limonite light is located near the surface and is present as weathered fine particles, and the sapporite light exists as relatively large crystalline particles in the lower part. In the case of nickel cerateite ore from New Caledonia, it was confirmed that oxidized ores were mainly present in the granules having a diameter of 5 mm or more and in the case of the granules having a diameter of 5 mm or less. The table in FIG. 5 summarizes the chemical compositions of the granules measured by XRF. The Mg + Si content of the granules above 5 mm is 12.73% on average, which is higher than that of granules below 5 mm, which is 6.04%. This means that the soprolite type ores having high contents of Si and Mg mainly exist in the grain size of 5 mm or more. Therefore, an experiment was carried out to separate and select the limonite light which can be used as the raw material of the smelting for the particle size of less than 5 mm.

2.1 Classification of nickel latex ores

New Caledonian nickel rheerite ore (-5 mm particle size) was pulverized into pinholes (-3 mm). The reason why 3 mm sieve is introduced when finely crushing the nickel lateion raw material is because the aggregation phenomenon occurs when a low particle size material is introduced due to a high water content of the raw material. The water content of the nickel latex raw material pulverized by the pin mill and the chemical composition analyzed by XRF are shown in the table of FIG. The water content of the nickel lateion ore is 23%, and the nickel content is 1.06%.

The nickel lateion raw material pulverized with a pin mill was subjected to primary classification at a linear velocity of 3000 rpm by a dry classifier. The underflowed corse was recovered through the first classifier and the overflowed particulate product was re - classified by improving the linear velocity of the dry classifier to 4000 rpm. The under-flowing fine and over-flow ultra fine products were recovered in the re-classification. The chemical composition and water content according to the particle size distribution and particle size of the product recovered by dry classification were analyzed (table in Fig. 7).

The assembly product was calculated as 5.8% of the total sample. The quality of the assembled product was Ni 0.67% and the water content was 13.4%. Low nickel content and water content are thought to be due to the large amount of coarse mineral in the assembled product.

The amount of particulate matter was 46.5% of the total sample. 90.3% of the total particulate matter was recovered at a particle size of 0.6 to 0.074 mm. The average quality of the particulate matter was 1.27% of Ni and 1.06% of that of ore. The water content of the particulate matter decreased from 23.0% of the ore to 19.2%, which is considered to be due to the dehydration effect due to airflow in the dry classifier. The nickel oxidation light injected into the wet smelting process is subjected to a drying and preliminary reduction roasting process prior to leaching. The dehydration effect of the classified products, which are incidentally obtained due to the airflow in the dry classifier, may reduce the cost of the wet smelting process.

Most of the superfine products obtained by overflow in the second dry classification process have a particle size of 0.15 mm or less. The nickel content of the microparticulate product was 1.29%, which was similar to that of the microparticulate product, but the water content was 6.7% on average, which was much smaller than the 23.0% of the ore. This means that the lower the particle size, the higher the drying effect by dry classification.

3.2 Drying Light Classification of Nickelate Lite

As described above, the nickel neatraterite raw material of New Caledonia was dried at 105 DEG C for 24 hours. The water content of the dried nickel laterate light is 9.1%. Drying light of nickel latex (-5 mm particle size) was pulverized with a pin mill (-1 mm), and chemical composition was analyzed by XRF (table of FIG. 8).

Drying light of nickel latex was dry classified by dry classifier of dry classifier at 3000 rpm in the same manner as that of ore powder, and the underflowed corse was recovered. The overflowed fine particles were redistributed at 4000 rpm in dry classifier, (fine) and ultrafine (fine) products were recovered.

The product of assembly was 0.1% of the total sample. The amount of microparticles was 18.4% and the yield of microparticles was 81.5%. It is considered that the reason why the amount of the ultrafine particulate product is high in the case of the dried nickel nitride latex is that it is finely pulverized compared to the ore due to a low water content (9.1%). In the case of the microparticulate products, 93% of the total microparticles were produced in the range of 0.6 ~ 0.074 mm, and in the case of the microparticulate products, 71.7% of the total microparticles were produced in less than 0.15 mm. The water content of the particulate and superfine products is about 2.5%. The nickel content of the microparticulate product and the microparticulate product was 1.14% and 1.25%, respectively, which was 1.06% higher than that of ore. The superfine product obtained by dry classification of laerite dry light not only improved the nickel content of the sample but also decreased the water content and the Si + Mg content, which means that the product quality was improved as a raw mineral for the wet smelting process. The production rate of the ultrafine particulate product is 81.5% of the input sample, which means that when dry nickel classification is performed, it is possible to supply more high-quality wet smelting raw material to the non-dried nickel latex raw material.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to separate mutually the limonite light and the saproproylite from the laterite light very simply by crushing (crushing) and dry classification. Accordingly, it is possible to separate the sapporite light mixed in the low-quality limonite light ore and obtain the improved limonite light. When the contents of the limonite light and the saproproylite are similar, they can be separated and supplied as a raw material for the wet smelting and the dry smelting.

Particularly, it is possible to remove magnesia which is inhibited in the acid leaching of wet smelting by separating the saprophyl light from the limonite light, and it is possible to reduce the amount of residues such as silica, thereby making economical wet smelting possible have.

In addition, in one embodiment of the present invention, by performing classification by dry type using a cyclone, the water content of the product is lowered, so that the products are separated into individual products and the specific surface area is widened, thereby increasing the acid leaching efficiency.

The scope of protection of the present invention is not limited to the description and the expression of the embodiments explicitly described in the foregoing. It is again to be understood that the present invention is not limited by the modifications or substitutions that are obvious to those skilled in the art.

Claims

A method for separating a saverite light and a limonite light from a laterite raw light,
(a) separating the gangue of the first particle size exceeding the first particle size and the intermediate product of the first particle size or less from each other by particle size separation of the latex raw material;
(b) drying the intermediate product to remove moisture;
(c) breaking the intermediate product to a second particle size or less; And
(d) separating the shredded intermediate product into a first product and a second product,
Wherein after the step (d), the second product, which is relatively fine particles, is separated through the dry cyclone to a third fraction of the superfine product.

The method according to claim 1,
The step (a) may include a first separation step using a roller screen and a second separation step of separating the relative fine product calculated in the first separation step on the basis of the first particle size using a Trommel screen Wherein the optical fiber is separated from the optical fiber.

3. The method of claim 2,
Wherein the first separation step separates the raw ratellite raw material based on the particle size of 20 to 30 mm and separates the minute products based on the particle size of 5 to 10 mm.

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The method according to claim 1,
Wherein in the step (c), the crushing is performed using any one of a pin mill, a hammer mill, and a jet mill.

The method according to claim 1,
Wherein the first and second products discharged through the classification in step (d) have a particle size range of 0.3 to 1.0 mm.

9. The method of claim 8,
Wherein the first product and the second product are products corresponding to D10 (upper 10% of the cumulative distribution) and D90 (lower 90% of the cumulative distribution) in the particle size distribution curve, respectively.

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The method according to claim 1,
And the third grain size is 0.074 mm.

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