KR20030095142A - Method for producing Calcium Carbonate fine powder by dry grinding and classification - Google Patents

Method for producing Calcium Carbonate fine powder by dry grinding and classification Download PDF

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KR20030095142A
KR20030095142A KR1020020032686A KR20020032686A KR20030095142A KR 20030095142 A KR20030095142 A KR 20030095142A KR 1020020032686 A KR1020020032686 A KR 1020020032686A KR 20020032686 A KR20020032686 A KR 20020032686A KR 20030095142 A KR20030095142 A KR 20030095142A
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calcium carbonate
average particle
particle diameter
grinding
powder
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KR1020020032686A
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KR100487728B1 (en
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이대생
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이대생
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/38—Adding fluid, other than for crushing or disintegrating by fluid energy in apparatus having multiple crushing or disintegrating zones
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer

Abstract

PURPOSE: A method for making calcium carbonate micro-powders by a simple dry process is provided to reduce the energy consumption, and to obtain the micro-powder having a sharp particle size distribution and excellent whiteness. CONSTITUTION: The method for making calcium carbonate micro-powder comprises the steps of: washing a natural ore of calcium carbonate; crushing the ore to the average particle diameter of 50-100 mm by a crude crusher; further crushing the ore to be the average particle diameter of 20-40 mm by a crusher selected from a hammer mill. a rod mill and a cone crusher; further crushing the powder to be the average particle diameter of 10-30 micrometers by a Raymond mill equipped with a classifier; finely crushing the powders to the average particle diameter of about 1.0-10 micrometers through a ball mill; classifying the finely crushed calcium carbonate powders to be the average particle diameter less than 1 micrometer through the classifier.

Description

건식분쇄 및 분급에 의한 탄산칼슘 미분말의 제조 방법{Method for producing Calcium Carbonate fine powder by dry grinding and classification}Method for producing fine calcium carbonate powder by dry grinding and classification

본 발명은 건식 분쇄 및 분급에 의한 탄산칼슘 미분말(CaCO3Powder)의 제조방법에 관한 것이다. 특히 본 발명은 제지용 충전제(充塡劑), 고무, 페인트용 필라(filler), 안료, 의약품 등에 사용되는 입도분포가 양호하고, 에너지를 절감할 뿐만아니라 제조 공정이 간략화된 건식분쇄 및 분급에 의한 탄산칼슘 미분말의 제조 방법에 관한 것이다.The present invention relates to a method for preparing calcium carbonate powder (CaCO 3 Powder) by dry grinding and classification. In particular, the present invention provides good particle size distribution used in papermaking fillers, rubbers, paint fillers, pigments, pharmaceuticals, etc. It relates to a method for producing fine calcium carbonate powder.

탄산칼슘은 수분의 함유여부에 따라 크게 습식제품(Slurry) 건식제품(Powder)으로 나누고, 물리 화학적 처리 방법에 따라 경질탄산칼슘(Precipitated light calcium carbonate)과 중질탄산칼슘(Groundlimestone)으로 나눈다. 본 발명은 건식분쇄 및 분급으로 이루어지고 화학반응이 동반되지 않는 중질탄산칼슘에 관한 것이다.Calcium carbonate is divided into wet dry powder according to water content, and divided into light calcium carbonate and groundlimestone according to physicochemical treatment methods. The present invention relates to heavy calcium carbonate consisting of dry grinding and classification and not accompanied by a chemical reaction.

탄산칼슘은 충전제, 증량제, 첨가제, 백색안료, 연마제 및 화학약품 등, 그 사용분야가 점차 확대되고 있으며, 그 사용량도 증가추세에 있다. 특히, 산성지(酸性紙) 황변화(黃變化)로 인한 열화(劣化)를 방지하고 지력증강에 의한 내구성이 향상되는 중성지(中性紙)의 수요가 급격히 증가하고, 중성지 제조용 충전제로는 탄산칼슘이 최적인 것으로 판명됨에 따라, 중성지의 필수 충전제인 고품위의 탄산칼슘은 새로운 수요창출로 인하여 시장규모가 크게 확대되고 있다.Calcium carbonate is used in a wide range of fields such as fillers, extenders, additives, white pigments, abrasives and chemicals, and its usage is also increasing. In particular, the demand for neutral paper, which prevents deterioration due to yellowing of acidic paper and improves durability by intensification, increases rapidly. As calcium turns out to be optimal, high-quality calcium carbonate, which is an essential filler for neutral paper, is expanding its market size due to new demand.

현재까지 알려진 중질탄산칼슘 미분말의 제조공정으로는 원광석을 조크러쉬(Jaw Crush), 롤크러쉬(Roll Crush), 볼밀(Ball Mill)등을 이용하여 반복적으로 파쇄 및 미분쇄하여 필요한 입경을 가진 탄산칼슘 미분말을 제조하는 방법이 있었다. 하지만, 이러한 방법으로 평균입경 1.0㎛ 이하의 탄산칼슘을 얻기 위하여 계속적으로 미분쇄할 경우에는 반복적인 미분쇄공정으로 인하여 에너지 효율이 떨어져 에너지 손실이 크며, 탄산칼슘 분말의 색상이 검은색으로 변하여 품질이 저하되는 등의 문제가 있었다.The manufacturing process of heavy calcium carbonate fine powder so far known is that calcium ore having the necessary particle size by repeatedly crushing and pulverizing ore using jaw crush, roll crush, ball mill, etc. There was a method of preparing fine powder. However, when continuously pulverizing to obtain calcium carbonate having an average particle diameter of 1.0 μm or less by this method, the energy efficiency decreases due to the repeated pulverization process, resulting in high energy loss, and the color of the calcium carbonate powder turns black. There was a problem such as deterioration.

이러한 건식분쇄의 한계를 극복하기 위하여 습식분쇄에 의한 분쇄방법이 도입되었는데, 평균입경 1.0㎛ 이하의 탄산칼슘 분말은 습식분쇄에 의한 슬러리를 스프레이드라이어(Spray-dryer)를 이용하여 건조하고, 건조된 제품의 엉김을 방지하기 위하여 다시 분쇄 및 분급을 함으로써 탄산칼슘 미분말을 제조하는 방법이 있었지만, 공정이 복잡하고 스프레이드라이어의 사용에 의한 생산원가가 높다는 문제점이 있었다.In order to overcome the limitations of the dry grinding, a grinding method by wet grinding was introduced. The calcium carbonate powder having an average particle diameter of 1.0 μm or less was dried using a spray-dryer to dry the slurry by wet grinding. In order to prevent the product from being entangled, there has been a method of preparing fine calcium carbonate powder by pulverizing and classifying again, but there are problems in that the process is complicated and the production cost is high due to the use of a spray dryer.

대한민국 특허 제128,061호의 "건식분쇄/습식분쇄 탄산칼슘 충전제 조성물"에서는 파쇄된 탄산칼슘을 조크러싱하고 해머밀링한 후, 최종적으로 해머분쇄한 것을 휘저(wizzer)를 함유하는 레이먼드롤러밀로 밀링하여 건식분쇄 탄산칼슘을 조제하고, 석회석을 조크러셔에 너어 으깨고 습식사이클론에 통과시키고, 습식원심분리기에 의해 선별된 미세한 입자의 현탁액을 농축하여 습식분쇄탄산칼슘을 제조함으로써, 상기 건식분쇄에 의한 탄산칼슘과 습식분쇄에 의한 탄산칼슘이 혼합된 혼합물로 이루어지는 미세분할 탄산칼슘에 관한 것이 있었으나, 제조 공정이 복잡하다는 등의 문제가 있었다.In the "dry grinding / wet grinding calcium carbonate filler composition" of Korean Patent No. 128,061, after crushing and crushing the pulverized calcium carbonate, the final hammer grinding is milled with a raymond roller mill containing a wizzer and dry grinding Calcium carbonate is prepared, the limestone is kneaded in a jaw crusher, passed through a wet cyclone, and the suspension of fine particles selected by a wet centrifuge is concentrated to produce wet pulverized calcium carbonate. There has been a problem relating to finely divided calcium carbonate composed of a mixture of calcium carbonate by grinding, but has a problem such as a complicated manufacturing process.

본 발명은 상기한 문제점을 고려하여 안출된 것으로서, 평균 입경 1.0㎛ 이하의 중질탄산칼슘의 제조방법에 있어서 종래 기술과 같은 에너지 효율이 낮은 반복적인 분쇄공정을 채택하지 않고, 분급 처리함으로써 공정의 간략화 및 에너지 사용의 절감을 도모하는 것을 그 목적으로 한다.SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in the method for producing heavy calcium carbonate having an average particle diameter of 1.0 μm or less, the process is simplified by classifying without using the energy-efficient repetitive grinding process as in the prior art. And aims to reduce energy use.

또한, 건식공정에 의할 경우 평균 입경 1.0㎛ 이하의 미세분말을 파쇄할 때 발생하는 열에너지에 의한 탄산칼슘의 변색을 방지함으로써 백색도(白色度)가 높을 뿐만아니라, 입경의 분포도가 낮은 중질 탄산칼슘의 제조방법을 제공하는 것을 그 목적으로 한다.In addition, the dry process prevents discoloration of calcium carbonate due to thermal energy generated when crushing fine powder having an average particle diameter of 1.0 μm or less, thereby increasing the whiteness and heavy calcium carbonate having a low particle size distribution. It is an object of the present invention to provide a method for producing the same.

도 1은 본 발명에 의한 탄산칼슘 미분말(하기 실시예 1)의 입경분포도이다.1 is a particle size distribution diagram of a fine calcium carbonate powder (Example 1) according to the present invention.

도 2는 본 발명에 의한 탄산칼슘 미분말(하기 실시예 2)의 입경분포도이다.2 is a particle size distribution diagram of the fine calcium carbonate powder (Example 2) according to the present invention.

도 3은 본 발명에 의한 탄산칼슘 미분말(하기 실시예 3)의 입경분포도이다.3 is a particle size distribution diagram of the fine calcium carbonate powder (Example 3) according to the present invention.

본 발명은 건식분쇄 및 분급에 의한 탄산칼슘 미분말의 제조방법에 관한 것이다. 본 발명은 광산에서 채광되어 선별된 탄산칼슘을 세척한 후, 반복적인 분쇄공정을 통하여 탄산칼슘을 평균입경이 1.0~10㎛이 되도록 예비분쇄하고, 분급기를 통하여 평균입경 1㎛이하의 탄산칼슘 분말을 분급하는 단계로 이루어진다.The present invention relates to a method for producing fine calcium carbonate powder by dry grinding and classification. In the present invention, after washing the selected calcium carbonate mined in the mine, and preliminarily pulverized calcium carbonate to an average particle diameter of 1.0 ~ 10㎛ through a repeated grinding process, calcium carbonate powder having an average particle diameter of 1㎛ or less through a classifier It is made to classify.

상기 예비분쇄 공정을 더욱 상세히 설명하면, 광산에서 채광되어 선별된 탄산칼슘을 조크러셔, 함머밀 또는 콘크러셔를 통하여 제1차 및 제2차 분쇄하고, 레이몬드밀에서 제3차 분쇄한 후, 분쇄된 분말을 볼밀을 통하여 다시 미분쇄하는 단계로 이루어지는 것이 바람직 하다. 이하에서 단계별로 상세히 설명한다.The preliminary grinding process will be described in more detail. The first and second milling of the calcium carbonate mined and selected in the mine through a jaw crusher, a hammer mill or a cone crusher, and a third milling in a raymond mill Preferably, the powder is pulverized again through a ball mill. It will be described in detail step by step below.

(1)원광석의 제1차 조분쇄 및 제2차 분쇄(1) first coarse and second milling of ore

최초 공정에 투입되는 방해석 등의 원광석을 세척하고, 조분쇄기인 조크러셔(Jaw Crusher)에 일정량 공급하여 제1차 조분쇄 한다. 조분쇄한 광석을 함머밀(Hammer Mill), 로드밀(Rod Mill) 또는, 콘크러셔(Cone Crusher)를 통하여 제2차 분쇄 후, 분쇄한 것을 건식 진동스크린을 통하여 필요한 직경으로 분급한다.After washing ore, such as calcite, which is introduced into the initial process, the first coarse grinding is performed by supplying a certain amount to a jaw crusher, which is a coarse grinding machine. The roughly crushed ore is subjected to the second milling through a hammer mill, a rod mill, or a cone crusher, and then the milled ore is classified into a required diameter through a dry vibration screen.

제1차 조분쇄에 의한 평균입경은 약 50~100mm가 바람직 하고, 제2차 분쇄에 의한 평균입경은 약 20~40mm가 가장 바람직하다.The average particle diameter of the first coarse grinding is preferably about 50 to 100 mm, and the average particle size of the second coarse grinding is most preferably about 20 to 40 mm.

(2) 제3차 분쇄 및 미분쇄(2) Third grinding and grinding

상기 공정을 통하여 분쇄 및 분급된 탄산칼슘 분말을 분급기가 장착된 레이몬드밀을 통하여 제3차 분쇄하고, 분산제를 투여한 후, 볼밀을 통하여 미분쇄한다.The calcium carbonate powder pulverized and classified through the above process is thirdly pulverized through a raymond mill equipped with a classifier, a dispersant is administered, and then pulverized through a ball mill.

분산제는 미분쇄에 의한 분말간의 엉김을 방지하고 입자간의 분산성을 높이는 작용을 하며, 바람직하게는 디에틸렌글리콜계 계면활성제를 사용할 수 있으며, 제3차 분쇄는 평균입경이 10~30㎛이 되도록 분쇄하는 것이 바람직하고, 볼밀(BallMill)을 통한 미분쇄는 분말의 평균입경이 약 1.0~10㎛이 되도록 분쇄하는 것이 바람직하다.The dispersant prevents entanglement between powders by fine grinding and enhances dispersibility between particles. Preferably, a diethylene glycol-based surfactant can be used, and the tertiary pulverization has an average particle diameter of 10 to 30 μm. It is preferable to grind, and it is preferable to grind | pulverize the fine grinding | pulverization through BallMill so that the average particle diameter of a powder may be about 1.0-10 micrometers.

(3) 미분쇄된 탄산칼슘 분말의 분급 및 재분급(3) Classification and reclassification of pulverized calcium carbonate powder

평균입경 1.0㎛이하인 탄산칼슘을 건식공정에 의하여 얻기 위해서는 하기 분급공정을 필요로 한다. 여기서 분급(Classification)이라 함은 입도 크기별로 고체 입자를 분리하는 방법을 뜻한다. 즉, 미분쇄된 탄산칼슘 분말의 침강 속도의 차이를 이용한 분급기(Classifier)를 통하여 굵은 입자들을 선별하여 분리하여 굵은 입자의 양을 줄임으로써 입경 분포가 양호하고 백색도가 뛰어난 미세 탄산칼슘 분말을 얻을 수 있다. 상기 분급은 분급기를 통하여 평균 입경이 1㎛ 이하가 되도록 함이 바람직 하다. 또한, 분말의 입경이 큰 부산물(Tailing)은 피브이씨(PVC) 충전제 또는 유리섬유강화프라스틱(FRP)등의 원료로 사용되거나, 볼밀에 의한 미분쇄 공정으로 다시 보내져 재분쇄 및 재분급 됨으로써 평균입경이 1㎛ 이하인 탄산칼슘 미분말을 얻을 수 있다. 이하 실시예 및 표를 통하여 구체적으로 설명한다.In order to obtain calcium carbonate having an average particle diameter of 1.0 µm or less by a dry process, the following classification step is required. Here, classification means a method of separating solid particles by particle size. That is, fine calcium carbonate powder having good particle size distribution and excellent whiteness can be obtained by reducing the amount of coarse particles by separating and separating the coarse particles through a classifier using a difference in sedimentation rate of the finely divided calcium carbonate powder. Can be. The classification is preferably such that the average particle diameter is 1㎛ or less through a classifier. In addition, by-product (Tailing) having a large particle size of powder is used as a raw material such as PVC filler or glass fiber reinforced plastic (FRP), or it is sent back to the fine grinding process by ball mill to be regrind and reclassified. A fine calcium carbonate powder having a particle diameter of 1 µm or less can be obtained. It will be described in detail through the following examples and tables.

(실시예 1)(Example 1)

탄산칼슘의 함량이 95% 이상인 원광석을 선별하여 세척하고, 직경 30cm 전후의 크기로 뿌레카(Breaker)로 파쇄하고, 조크러셔를 통하여 직경 80mm 정도로 제1차 조분쇄 한다.The ore with the calcium carbonate content of 95% or more is selected and washed, crushed with Breca to a size of about 30 cm in diameter, and first coarsely crushed to about 80 mm in diameter through a jaw crusher.

상기 분말을 콘크러셔를 통하여 분쇄하고(제2차 분쇄), 건식 빈동 스크린을 이용하여 평균입경이 약 30mm가 되도록 분말(Head Sample)을 분리한다.The powder is pulverized through a cone crusher (secondary pulverization), and a powder (Head Sample) is separated to have an average particle diameter of about 30 mm using a dry pulsating screen.

상기 원료(Head Sample)를 상부에 분급기가 장착된 레이몬드밀(제3차 분쇄)에서 분급기의 rpm을 적절히 조절하면서 입경이 20㎛ 정도인 탄산칼슘 분말을 생산한다.The raw material (Head Sample) in the Raymond mill (third grinding) equipped with a classifier on the top to produce a calcium carbonate powder having a particle size of about 20㎛ while properly adjusting the rpm of the classifier.

상기 분말에 디에틸렌글리콜계 계면활성제 3500ppm을 투입하고, 볼밀을 통하여 미분쇄하고, 미분쇄된 분말을 별도로 설치된 분급기에서 분금함으로써, 입경의 중간값(mid-point)이 2.18㎛이고, 입자크기에 따른 분포가, 입경이 10㎛ 이상인 입자들이 10중량% 정도이고; 입경이 0.35㎛ 이상이고 10㎛이하인 입자들이 80중량% 정도이고 ; 입경이 0.35㎛ 이하인 입자들이 10중량% 정도인 분포를 가지는 탄산칼슘 분말의 원료(Head Sample) 1000kg을 준비한다.3500 ppm of diethylene glycol-based surfactant was added to the powder, and finely pulverized through a ball mill, and the pulverized powder was dispensed by a separately installed classifier, so that the mid-point of the particle diameter was 2.18 μm, and the particle size was Distribution is according to the particle size of 10㎛ or more about 10% by weight; About 80% by weight of particles having a particle diameter of 0.35 mu m or more and 10 mu m or less; 1000 kg of a head sample of calcium carbonate powder having a particle size of 0.35 μm or less having a distribution of about 10 wt% is prepared.

상기 원료(Head Sample)를 공기 1m3당 4g이 되도록 유지하면서, 3500rpm의 초미립 분급기(Ultra fine classifier)를 통하여 입경의 중간값(mid-point)이 약 0.75㎛인 탄산칼슘(product) 440kg 및 입경의 중간값이 약 5.5㎛ 인 탄산칼슘 부산물(tailing) 560kg을 생산할 수 있었으며, 본 실시예에 의한 결과는 하기 도1 및 표 1과 같다.440 kg of calcium carbonate (product) having a mid-point of about 0.75 μm through a fine fine classifier of 3500 rpm while maintaining the head sample at 4 g per 1 m 3 of air And it was able to produce 560kg calcium carbonate by-product (tailing) having a median particle size of about 5.5㎛, the results according to this embodiment are shown in Figure 1 and Table 1.

(실시예 2)(Example 2)

상기 실시예 1에서, 원료(Head Sample)는 공기 1m3당 3g 인 원료를 사용한 것 이외의 조건은 실시예 1과 동일하게 처리하여, 탄산칼슘 분말을 제조한 결과, 입경의 중간값이 약 0.62㎛인 탄산칼슘(product) 420kg 및 입경의 중간값이 약 4.8㎛인 탄산칼슘 부산물(tailing) 580kg을 생산할 수 있었으며, 본 실시예에 의한 결과는 하기 도 2 및 표 1과 같다.In Example 1, the head sample was treated in the same manner as in Example 1 except that a raw material of 3 g per 1 m 3 of air was produced, and as a result, a calcium carbonate powder was produced. 420 kg of calcium carbonate (product) and 580 kg of calcium carbonate by-product (tailing) having a median particle size of about 4.8 μm were produced, and the results according to the present embodiment are shown in FIG. 2 and Table 1 below.

(실시예 3)(Example 3)

상기 실시예 1에서, 원료(Head Sample)는 공기 1m3당 5g 인 원료를 사용한 것 이외의 조건은 실시예 1과 동일하게 처리하여, 탄산칼슘 분말을 제조한 결과, 입경의 중간값이 약 0.81㎛인 탄산칼슘(product) 450kg 및 입경의 중간값이 약 6.5㎛인 탄산칼슘 부산물(tailing) 550kg을 생산할 수 있었으며, 본 실시예에 의한 결과는 하기 도 3 및 표 1과 같다.In Example 1, the head sample was treated in the same manner as in Example 1 except that a raw material of 5 g per 1 m 3 of air was prepared, and as a result, a calcium carbonate powder was produced. 450 kg of calcium carbonate (product) and 550 kg of calcium carbonate by-product (tailing) having a median particle size of about 6.5 μm could be produced, and the results according to the present embodiment are shown in FIG. 3 and Table 1 below.

(비교예 1)(Comparative Example 1)

예비분쇄인 제3차 분쇄 공정까지는 실시예 1과 동일하다. 제3차 분쇄에 의하여 얻어진 탄산칼슘 분말에 물이 첨가된 슬러리를 평균 입경 1.4~1.6㎛이 되도록 제1차 습식 미분쇄 하고, 다시 제2차 습식미분쇄 함으로써 입경이 0.6~0.75㎛인 미새탄산칼슘 슬러리를 제조한다. 상기 슬러리를 스크레이드라이어(Spray-dryer)를 통하여 수분이 0.3%이하가 되도록 건조하고, 상기 분말의 엉김을 방지하기 위해 다시 분쇄 및 분급함으로써 평균 입경이 0.6~0.75㎛인 미세 탄산칼슘 분말을 얻었다.It is the same as Example 1 until the 3rd grinding process which is pre-pulverization. The first wet fine grinding of the slurry to which the water was added to the calcium carbonate powder obtained by the third grinding to have an average particle diameter of 1.4 to 1.6 µm, and then again to the second wet grinding, which results in a particle diameter of 0.6 to 0.75 µm. Calcium slurry is prepared. The slurry was dried to a moisture content of 0.3% or less through a spray-dryer, and pulverized and classified again to prevent agglomeration of the powder, thereby obtaining fine calcium carbonate powder having an average particle diameter of 0.6 to 0.75 µm. .

표 1. 실시예 1 내지 3에 의하여 제조된 탄산칼슘 분말의 특성Table 1. Properties of calcium carbonate powder prepared by Examples 1 to 3

실시예 1Example 1 실시예 2Example 2 실시예 3Example 3 초미립 분급기에 투입되는탄산칼슘 분말의 무게(g/m3)Weight of calcium carbonate powder fed to ultra fine classifier (g / m 3 ) 4g/m3 4g / m 3 3g/m3 3g / m 3 5g/m3 5g / m 3 생산량(product)Product 440kg440 kg 420kg420 kg 450kg450 kg product 입경의 중간값median of product particle diameter 0.75㎛0.75 μm 0.62㎛0.62 μm 0.81㎛0.81 μm 부산물(tailing)Tailings 560kg560 kg 580kg580 kg 550kg550 kg tailing 입경의 중간값median of the tailing particle diameter 5.5㎛5.5㎛ 4.8㎛4.8㎛ 6.5㎛6.5㎛ 백색도Whiteness 95%95% 95%95% 95%95% 부분 분리효율(25Ф75)Partial Separation Efficiency ( 25 Ф 75 ) 4.64.6 4.84.8 4.54.5

상기 표 1에서 부분분리 효율이라 함은, 어떤 입도의 입자가 제품에 얼마정도 나누어 들어가는지를 나타내는 지표로서,25Ф75 =입도누적분포 25% 인 경우의 탄산칼슘 분말의 입경/입도누적분포 75%인 경우의 탄산칼슘 분말의 입경의 값을 나타낸 것이다.In Table 1, the partial separation efficiency is an index indicating how much particle of particle size is divided into a product, and the particle size / particle accumulation distribution of the calcium carbonate powder is 25% when 25 Ф 75 = 25% particle size distribution. It shows the value of the particle diameter of the calcium carbonate powder in the case of.

표 2. 공정 단순화에 따른 전력사용량의 비교Table 2. Comparison of Power Consumption by Process Simplification

비교예 1Comparative Example 1 소요전력(Kw/Ton)Power Consumption (Kw / Ton) 실시예 1Example 1 소요전력(Kw/Ton)Power Consumption (Kw / Ton) 제1차 습식미분쇄First wet grinding 100100 볼 밀 분쇄Ball mill grinding 200200 제2차 습식미분쇄Second wet grinding 8080 습식분급Wet classification 2020 분급Classification 8080 스프레이드라이어(0.3%이하건조)Spray dryer (less than 0.3% drying) 400400 분쇄smash 2020 재분급Reclassification 8080 분급Classification 1010 제품product 630(Total)630 (Total) 제품product 360(Total)360 (Total)

상기 표 2는 제3차분쇄 이하의 공정에 있어서의 생산공정과 전력사용량을 비교한 것이다. 본 발명의 공정에 의한 경우, 기존의 생산공정에 비하여 생산공정이 크게 간략화 되었으며, 아울러 에너지 절감의 효과가 있다.Table 2 compares the production process and the power consumption in the process below the third crushing. According to the process of the present invention, the production process is greatly simplified compared to the existing production process, and there is also an effect of energy saving.

평균 입경 1㎛ 이하의 중질탄산칼슘 미분말의 제조방법에 있어서, 본 발명은 기존의 습식분쇄 후의 스프레이드라이어에 의한 건조 및 재분쇄 공정을 채택하지 않고, 볼밀에 의한 미분쇄 이하의 단계에서 분급 및 재분급 공정을 도입함으로써 탄산칼슘 미분말 제조공정의 간략화를 도모하고, 에너지 절감이 큰 효과가 있다.In the method for producing heavy calcium carbonate fine powder having an average particle diameter of 1 µm or less, the present invention does not adopt a conventional drying and regrinding process by a spray dryer after wet grinding, and classifies and re-grades in a step below fine grinding by a ball mill. By introducing a classification process, the manufacturing process of fine calcium carbonate powder can be simplified, and energy saving is greatly effective.

또한, 기존의 계속적인 건식분쇄에 의하여 탄산칼슘 미분말을 제조하는 경우와 같은 변색이 되지 않는 백색도가 양호할 뿐만 아니라, 분말의 입경분포가 양호한 탄산칼슘 미분말을 얻을 수 있는 효과가 있다.In addition, the whiteness which does not become discolored as in the case of manufacturing fine calcium carbonate powder by the conventional continuous dry grinding is not only good, there is an effect of obtaining a fine calcium carbonate powder having a good particle size distribution of the powder.

Claims (4)

탄산칼슘 원광석을 세척한 후, 탄산칼슘 분말의 평균입경이 50~100mm가 되도록 조크러셔로 분쇄하고(제1차 조분쇄); 조분쇄한 광석을 평균입경이 20~40mm가 되도록 함머밀, 로드밀 및 콘크러셔로부터 선택된 하나의 분쇄기로 다시 분쇄하고(제2차 분쇄); 상기 분쇄된 분말을 분급기가 장착된 레이몬드밀로 평균 입경이 10~30㎛이 되도록 분쇄한 후(제3차 분쇄); 볼밀을 통하여 평균입경이 약 1.0~10㎛이 되도록 미분쇄하고; 미분쇄된 탄산칼슘 분말을 분급기를 통하여 평균 입경 1㎛ 이하의 탄산칼슘 분말을 분급하는 단계로 이루어지는 것을 특징으로 하는 탄산칼슘 미분말의 제조방법.Washing the calcium carbonate ore, and then grinding it with a jaw crusher so that the average particle diameter of the calcium carbonate powder is 50 to 100 mm (first coarse grinding); The coarsely crushed ore is crushed again by one grinder selected from a hammer mill, a rod mill and a cone crusher so as to have an average particle diameter of 20 to 40 mm (secondary grinding); After pulverizing the pulverized powder with a raymond mill equipped with a classifier so that the average particle diameter is 10 ~ 30㎛ (third grinding); Grinding through a ball mill so that an average particle diameter becomes about 1.0-10 micrometers; The finely divided calcium carbonate powder is classified into a calcium carbonate powder having an average particle diameter of 1 μm or less through a classifier. 제1항에 있어서, 분급을 통하여 분리된 평균 입경이 1㎛을 초과하는 탄산칼슘 분말을 볼밀을 통하여 평균입경이 1.0~10㎛이 되도록 다시 미분쇄하고, 분급기를 통하여 평균입경 1㎛ 이하의 탄산칼슘 분말을 재분급하는 단계를 더 포함하는 것을 특징으로 하는 탄산칼슘 미분말이 제조방법.The method according to claim 1, wherein the calcium carbonate powder having an average particle size of more than 1 μm separated through classification is again pulverized by means of a ball mill so that the average particle size is 1.0 to 10 μm, and the carbonic acid having an average particle size of 1 μm or less through a classifier. Method for producing a fine calcium carbonate powder, characterized in that it further comprises the step of reclassifying calcium powder. 제1항에 있어서, 탄산칼슘 분말의 볼밀에 의한 미분쇄에 앞서 분산제를 첨가하는 단계를 더 포함하는 것을 특징으로 하는 탄산칼슘 미분말의 제조방법.The method for preparing fine calcium carbonate powder according to claim 1, further comprising the step of adding a dispersant prior to the fine grinding of the calcium carbonate powder by a ball mill. 제3항에 있어서, 분산제는 디에틸렌글리콜계 계면활성제인 것을 특징으로 하는 탄산칼슘 미분말의 제조방법.The method for producing fine calcium carbonate powder according to claim 3, wherein the dispersant is a diethylene glycol-based surfactant.
KR10-2002-0032686A 2002-06-11 2002-06-11 Method for producing Calcium Carbonate fine powder by dry grinding and classification KR100487728B1 (en)

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US8048932B2 (en) 2008-08-21 2011-11-01 Korea Institute of Geoscience and Material Resources Fabrication method of CaCO3 nanoparticles using beads milling
KR20210100270A (en) * 2020-02-06 2021-08-17 태경산업 주식회사 Method for manufacturing heavy calcium carbonate of large particle size
CN115739347A (en) * 2022-08-19 2023-03-07 王伟博 Preparation method and application of nano calcium carbonate for food additive

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KR870004378A (en) * 1985-10-04 1987-05-09 존 이·모울 Bus interface
KR950029190A (en) * 1994-04-13 1995-11-22 서상기 Calcium carbonate manufacturing method using shell
US5575984A (en) * 1994-06-09 1996-11-19 Abb Environmental Systems, Div. Of Abb Flakt, Inc. Method for preparing calcium carbonate for scrubbing sulfur oxides from combustion effluents
JP3236803B2 (en) * 1997-09-12 2001-12-10 日東粉化工業株式会社 Method for producing calcium carbonate powder, calcium carbonate powder and polymer additive using the same
AU3615800A (en) * 1999-03-02 2000-09-21 Michael W Ginn A composition of matter comprising high brightness calcium carbonate pigments and processes for making same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8048932B2 (en) 2008-08-21 2011-11-01 Korea Institute of Geoscience and Material Resources Fabrication method of CaCO3 nanoparticles using beads milling
KR20210100270A (en) * 2020-02-06 2021-08-17 태경산업 주식회사 Method for manufacturing heavy calcium carbonate of large particle size
CN115739347A (en) * 2022-08-19 2023-03-07 王伟博 Preparation method and application of nano calcium carbonate for food additive

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