KR0121560B1 - Dry separating method of calcite - Google Patents

Abstract

A calcite ore is crushed by a jaw crusher and cracked by an impact mill. The cracked stuff is sieved to be classified into coarse, medium and fine grains, at this time extra materials such as quartz, dolomite and felspar are excluded, but clay is included in the fine grains. Extra materials included in the medium grain are excluded by a dry magnetic sorting, obtaining high quality pure calcite. The fine grain calcite is classified and is mixed selectively with pure calcite, crushed into power and made a high quality calcite power. O/F product in the fine grain is classified to low quality calcite.

Description

Dry Purification Method of Calcite

1 is a purification process of the present invention.

The present invention relates to a dry purification method of calcite, and to provide a high-quality calcite powder through crushing, classifying and refining processes using calcite ore as a raw material.

Processes for producing fine powder using calcite as a raw material can be roughly classified into wet and dry methods.

In the case of a wet manufacturing process, in order to improve the whiteness and quality of ore, the purification process by water washing and flotation has been frequently used.However, in the dry manufacturing process, relatively good quality ore at the time of mining has not been applied. It is the situation that the powder is manufactured by selecting, collecting and crushing and grinding the bay.

Therefore, it is difficult to expect the uniformity of the product, such as the change of the material of the powder product according to the condition of the calcite ore, and in the case of low-grade ore, the utilization rate is low due to the uncertainty of the dry treatment process for improving the whiteness and quality .

In the manufacture of powders made of calcite ore as a raw material, the conventional technique can improve the whiteness and quality in the wet process by washing and flotation, but due to post-treatment problems such as dehydration, drying and wastewater treatment, because water is used. The complexity of the manufacturing process and the increase of manufacturing atoms are inevitable, and in the case of the dry process, it is difficult to expect the improvement of the whiteness and quality of the powder if only the classification process for crushing and grinding is applied.

The present invention is the simplest and most economical dry process in the manufacture of calcite powder, using high-quality, high-whiteness homogeneous powder by inserting a part of the process and refining process while using the crushing and classification process that has been used so far. It is intended to develop the use of low-grade calcite for the production of fine powder and to improve the added value of calcite.

The method for separating calcite concentrate and impurities contained in calcite ore is as follows. First, crushing and pulverizing into suitable inlets that can be separated into groups according to the size of calcite crystals, and then separating them into granulated, neutral and fine products by sieving. do.

At this time, the calcite concentrate and the impurity mineral have different fracture and grinding characteristics due to the mineralogical characteristics.

That is, the granulated product has a high content of minerals (hard minerals) of high hardness such as quartz (Mohos hardness 7), dolomite (Mohos 4) and feldspar (Mohos hardness 6), and the neutral product is calcite (Mohos hardness 3). ) And chlorite (Morth hardness 2-25), etc., have a high mineral content of medium hardness.

In addition, the particulate product will contain impurities such as clay (morse hardness 1-2).

Among these products, granulated products contain impurities such as quartz dolomite with a high mohos hardness, and the neutral products are separated by secondary purification through dry magnetic screening to remove iron impurity minerals to obtain high-quality calcite concentrate. .

The particulates also contain particulate impurities from calcite concentrates and clay minerals, which can be purified by secondary precision classification.

In other words, when the particulate product is classified, calcite concentrate is U / F product, and impurities such as clay mineral can be selectively separated into O / F product.

Among these fine products, O / F products containing clay minerals are low-grade powders. U / F products, which are calcite concentrates, are pulverized together with magnetic screening concentrates in neutral products to produce high-quality and high-white calcite powders. .

And already known patent publication 93-10550 uses an operation of separating ferromagnetic material from dust generated in steelmaking process, but ferromagnetic materials (single or complex oxides such as Fe, Ni, Cr, etc.) are generally 10,000. Most of them can be separated even by a Gaussian magnetic separator, and the use of a fluidized bed forms a particularly improved removal and separation efficiency of particulate impurities. Do.

The present invention is a characteristic method capable of selectively recovering high-quality calcite concentrates by dry refining methods such as selective wave, crushing, classification, and magnetic screening according to the mineral properties of calcite concentrates and impurity minerals contained in calcite ore. .

[Detailed process]

The present invention will be described with reference to the purification process shown in Figure 1 as follows.

The calcite ore is crushed by jaw crusher and then crushed by hammer crusher or impact mill.

The pulverized product is separated into granulated, neutral, and fine products by dry sieve. At this time, impurities such as quartz, dolomite, and feldspar are separated and removed as granulated products, and impurities such as clay are contained in the fine products.

Due to the similarity of calcite concentrate and crushing, impurity minerals contained in neutral products are removed by dry magnetic screening to obtain high quality calcite concentrate.

Particulates containing fine particles of clay ore are selectively separated from calcite concentrates and impurity minerals through classification.

In this way, it is pulverized together with the magnetic screening concentrate thus obtained, and is made into high quality and calcite powder, and the O / F product (less than -325 mesh) containing impurities in the fine product is separated and manufactured into low quality powder.

EXAMPLE

After crushing the calcite ore in Table 1 using a jaw crusher, the crushed product is ground to 1 mm or less (16 mesh) with a hammer crusher.

This milled product is separated into +35 mesh, -35 mesh / + 100 mesh, and -100 mesh using 35 mesh (0.4 mm) and 100 mesh (0.15 mm) sieves.

Of these sieve products, the +35 mesh product is classified as an impurity, and the -35/100 mesh product is purified by a reduced roller charity.

In addition, the fine product is classified into 325 mesh (43 microns) or less by using a dry air classifier, and then the product of 325 mesh or more is pulverized with magnetic screening concentrate in the neutral product to produce a high-grade calcite powder. Is used as a low quality powder.

At this time, the grades of calcite concentrate, low-grade products, tailings (impurity), etc. are shown in Table 2, and the recoveries of useful products are shown in Table 3.

Although calcite is one of the minerals that are relatively rich in burial stocks in Korea, there are not many high quality ore and it has been almost mined because it has been selectively mined for high quality ore for use in high quality. The utilization rate is low except for cement production due to lack of economic refining method.

This description is a method that can be easily applied to the calcite powder production process that is currently in operation, is expected to increase the utilization rate and added value of low-grade calcite, and to produce a homogeneous powder regardless of the calcite ore quality.

Claims (1)

In crushing, pulverizing and dry purifying calcite ore, selective crushing and sieving are performed using the difference in the crushing and grinding strength between mineral and impurity light, but granulated products of +35 mesh and products of 325 mesh or less are used as lower powder. And a step of purifying the neutral product of -35 mesh / + 100 mesh by dry magnetic force, which is the usual method, and the U / F product of +325 mesh or more, finely classified fine particles of 100 mesh or less, A method for dry purification of calcite, characterized in that the step of recovering to powder and O / F product of less than 325 mesh, the step of treating with low-grade powder.