KR19990070806A - Method for Extracting Precious Metal Elements from Waste Printed Circuit Board Using Waste Copper Slag - Google Patents

Method for Extracting Precious Metal Elements from Waste Printed Circuit Board Using Waste Copper Slag Download PDF

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KR19990070806A
KR19990070806A KR1019980005853A KR19980005853A KR19990070806A KR 19990070806 A KR19990070806 A KR 19990070806A KR 1019980005853 A KR1019980005853 A KR 1019980005853A KR 19980005853 A KR19980005853 A KR 19980005853A KR 19990070806 A KR19990070806 A KR 19990070806A
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waste
precious metal
slag
melting
pcb
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KR1019980005853A
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KR100250060B1 (en
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반봉찬
심순섭
강석민
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반봉찬
이상한
주식회사 코리아리싸이트
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

폐기되는 전자제품의 폐 인쇄회로기판(PCB)에는 상당량의 귀금속원소가 포함되어 있음에도 불구하고 현재 국내에서는 이를 효과적으로 추출할 기술이 마땅치 않아 거의 전량 폐기되거나, 외국에 수출되는 것에 불과한 것이었다.Although waste printed circuit boards (PCBs) of discarded electronic products contain a considerable amount of precious metal elements, they are currently deemed to be effectively extracted in Korea, but almost entirely discarded or exported to foreign countries.

따라서 본 발명은 동제련공정 중에 발생하는 폐기 동(Cu)슬래그의 조성이 귀금속 건식용해법을 이용하여 폐PCB를 용융시켜 귀금속원소를 얻고자 할 때 첨가하는 용재성분으로 매우 바람직하다는 것에 착안하여 종래 고가의 용재성분인 생석회나 이산화규소를 대체하여 사용하기 위한 것이다.Therefore, the present invention focuses on the fact that the composition of the waste copper (Cu) slag generated during the copper smelting process is very preferable as a solvent component to be added when the waste PCB is melted using the precious metal dry dissolution method to obtain the precious metal element. It is intended to be used as a substitute for quicklime or silicon dioxide.

Description

폐기 동슬래그를 이용한 폐 인쇄회로기판의 귀금속원소 추출방법Method for Extracting Precious Metal Elements from Waste Printed Circuit Board Using Waste Copper Slag

본 발명은 동제련소 등에서 동(Cu) 제련시에 발생하는 폐기 동슬래그를 이용하여 폐기되는 전자제품의 인쇄회로기판(이하 폐PCB라 한다)로 부터 금, 은, 백금속원소 등과 같은 귀금속원소를 추출하는 방법에 관한 것이다. The present invention relates to precious metal elements such as gold, silver, and white metal elements from printed circuit boards (hereinafter referred to as waste PCBs) of electronic products that are discarded by using copper slag generated during copper smelting in copper smelters. Relates to a method of extraction.

최근 가전제품, 컴퓨터, 핸드폰등과 같은 전자제품에는 그 기능을 향상시키기 위하여 금, 은, 백금족원소들과 같은 귀금속원소의 함량을 대폭 증가시키고 있는 실정임에도 불구하고, 국내에는 상기와 같은 전자제품들이 폐기될 경우 발생하는 폐PCB의 이용방안에 대한 연구는 그다지 진전되어있지 못한 상황이다. 특히 폐PCB에 함유된 귀금속원소를 추출, 정련하는 기술은 아직 미비하므로 폐PCB를 그대로 폐기처분하거나, 조정련상태에서 외국에 수출할 수밖에 없어 국가적으로 많은 경제적 손실을 보고 있는 실정이다.In recent years, electronic products such as home appliances, computers, mobile phones, and the like have significantly increased the content of precious metal elements such as gold, silver, and platinum group elements to improve their functions. Research on the use of the waste PCB when it is discarded is not progressed much. In particular, the technology of extracting and refining precious metal elements contained in the waste PCB is still incomplete. Therefore, the waste PCB has to be disposed of as it is, or exported to foreign countries in the state of refining.

현재 폐PCB로부터 귀금속원소를 추출하기위해 여러 가지 방법이 사용되고 있으나, 산이나 알카리용액으로 귀금속원소를 직접 침출시키는 습식법은 수질오염 등의 우려가 있어 세계적으로 점차 사양화되고 있으며, 대신 포집재가 기저에 형성된 플라즈마로나 아크로에 폐PCB를 용융시켜 슬래그를 조성하고 귀금속원소들을 조금속상태로 포집재에 의해 포집한 후, 이를 소규모의 습식법으로 정련하는 귀금속 건식용해법을 대부분의 국가에서 채택하고 있다.Currently, various methods are used to extract precious metal elements from waste PCB, but the wet method of directly leaching precious metal elements with acid or alkaline solution is increasingly being specified worldwide because of water pollution. Most countries have adopted the noble metal dry melting method in which waste PCB is melted in a plasma furnace or an arc furnace to form slag, and precious metal elements are collected by a trapping material in a crude metal state and then refined by a small wet method.

상기 귀금속 건식용해법은 용융된 폐PCB에서 추출될 귀금속원소의 손실을 줄이는 것이 무엇보다 중요하며, 이를 위해서는 적절한 슬래그조성을 유지하는 것이 매우 중요하다. 또한 상기 슬래그 조성과 염기도 조정은 폐PCB 내의 귀금속원소의 회수측면과 내화물유지, 유동도, 소재화측면에서 대단히 중요한 요소로써, 현재는 폐PCB를 용융시켜 슬래그를 만들기 위해 탄산나트륨(Na2CO3), 산화칼슘(CaO), 탄산칼슘(CaCO3), 이산화규소(SiO2)과 같은 천연적 용재의 염기성 성분을 사용하여 슬래그의 유동성 및 귀금속의 슬래그 내의 용해도를 저감시키는 방법을 사용하고 있으나, 폐PCB는 로에서 직접 용융시 슬래그 점성도가 크고, 전기 전도도는 적어 전기로에서 이를 적절하게 처리하기가 지극히 어려운 폐단을 갖는다. 또한 슬래그 조성을 조절하기 위한 슬래그 조정제로 상기 원료들을 사용하기에는 이들 원료들이 너무나 고가이고 귀금속원소의 추출율이 낮아 비경제적이며, 귀금속원소의 추출에 많은 시간을 필요로 하는 폐단을 갖는 것이다.In the precious metal dry melting method, it is important to reduce the loss of precious metal elements to be extracted from the molten waste PCB, and for this purpose, it is very important to maintain proper slag composition. In addition, the slag composition and basicity adjustment are very important factors in terms of recovery, refractory maintenance, fluidity, and materialization of precious metal elements in the waste PCB. Currently, sodium carbonate (Na 2 CO 3 ) Using basic components of natural solvents such as calcium oxide (CaO), calcium carbonate (CaCO 3 ) and silicon dioxide (SiO 2 ) to reduce slag fluidity and solubility in slag of precious metals. The PCB has a high slag viscosity when directly melted in the furnace and a low electrical conductivity, making it extremely difficult to properly process it in an electric furnace. In addition, these raw materials are too expensive to use the raw materials as a slag adjusting agent for controlling the slag composition, and the extraction rate of the precious metal elements is uneconomical, and has a closed end that requires a lot of time to extract the precious metal elements.

본 발명은 동 제련시의 발생하는 폐동슬래그의 조성이 귀금속원소의 슬래그내 용해도가 최적임을 감안하여 귀금속건식용해법중 상기 폐PCB의 용융시 귀금속원소를 추출하기 위한 용재로 사용하므로써 폐PCB로부터 귀금속원소를 추출하고자 하는 것이다. 즉 상기 폐동슬래그는 동 제련과정에서 발생하는 것으로 정광 용융후 마트(matte) 용해후나 부분배소후 용융상 용해로 부터, 또는 배소반응후 동 직접용융시발생하거나 슬래그 선광후에 발생하는 슬래그이다.In the present invention, since the composition of waste copper slag generated during copper smelting is optimal in solubility of slag of precious metal element, it is used as a material for extracting precious metal element during melting of the waste PCB in the precious metal dry dissolution method. To extract. That is, the waste copper slag is a slag that occurs during the copper smelting process, from the melting of the matte after the melting of the concentrate or after the partial roasting, or from the melting of the melting phase after the roasting reaction, or after the slag beneficiation.

이들의 화학적 조성은 구리(Cu) 0.3∼3.0%, 납(Pb) 0.2∼4.8%, 아연(Zn) 0.1∼11.0%, 철(Fe) 32.1∼44.0%, 유황(S) 0.2∼2%, 산화칼슘(CaO)나 산화마그네슘(MgO) 0.1∼7.4%, 이산화규소(SiO2) 22.8∼37.5%, 산화알루미늄(Al2O3) 0.1∼8%, 산화철(Fe3O4) 3∼6%로 이루어져 있으므로, 귀금속건식용해법에 있어서 폐PCB의 용융시 슬래그의 염기도 조정, 전기전도도 조절, 철(Fe)의 재 회수를 위한 철(Fe)의 포집금속으로의 이용등 조업 측면에서 매우 바람직한 용재성분을 함유하고 있는 것이다.Their chemical composition is 0.3-3.0% of copper (Cu), 0.2-4.8% of lead (Pb), 0.1-11.0% of zinc (Zn), 32.1-44.0% of iron (Fe), 0.2-2% of sulfur (S), Calcium oxide (CaO) or magnesium oxide (MgO) 0.1-7.4%, silicon dioxide (SiO 2 ) 22.8-37.5%, aluminum oxide (Al 2 O 3 ) 0.1-8%, iron oxide (Fe 3 O 4 ) 3-6 As it is composed of%, it is very desirable for the operation of the precious metal dry melting method in terms of operation such as adjusting the basicity of slag at the time of melting waste PCB, controlling the electric conductivity, and using iron (Fe) as a collecting metal for recovering iron (Fe). It contains ingredients.

표 1. 동제련 폐슬래그의 조성 (단위 : 중량%)Table 1. Composition of copper smelting waste slag (unit: wt%)

구리(Cu)Copper (Cu) 철(Fe)Fe 산화칼슘/산화마그네슘(CaO/MgO)Calcium Oxide / Magnesium Oxide (CaO / MgO) 이산화규소(SiO2)Silicon Dioxide (SiO 2 ) 산화알루미늄(Al2O3)Aluminum Oxide (Al 2 O 3 ) 산화철(Fe3O4)Iron Oxide (Fe 3 O 4 ) 0.3∼3.00.3 to 3.0 32.1∼4432.1 to 44 0.1∼7.40.1-7.4 22.8∼37.522.8-37.5 0,1∼80,1-8 3∼63 to 6

도 1 - 본 발명의 공정도.1-process diagram of the present invention.

이하 본 발명의 제조방법을 상세히 설명하면 다음과 같다.Hereinafter, the manufacturing method of the present invention will be described in detail.

먼저 폐PCB는 슈레더로 분쇄하는 공정과 상기 공정을 거쳐 분쇄된 폐PCB를 그대로 용융로에 투입하거나 또는 분쇄된 폐PCB를 하소작업을 통해 수지(樹脂) 등을 분해시키고, 납(Pb) 등의 휘발성 금속성분은 제거하여 용융로에 투입하고, 또한 폐동슬래그 역시 직경 대략 0,1 ∼ 10mm이하로 수쇄 또는 크라셔에 의해 분쇄한 뒤, 수분을 건조시켜 역시 용융로에 투입하는 공정을 거친다. 상기 폐동슬래그의 직경을 0,1에서 10mm로 한정하는 이유는 폐동슬래그가 0,1mm이하일 경우에는 비산의 우려가 있고, 10mm이상일 경우에는 용융작업이 곤란하기 때문이다.First, waste PCB is crushed with a shredder and waste PCB that is crushed through the above process is put into the melting furnace or calcined waste PCB is calcined to decompose resins, and lead (Pb) The metal components are removed and introduced into the melting furnace, and the waste copper slag is also crushed by crushing or crusher with a diameter of about 0,1 to 10 mm or less, followed by drying the water and putting it into the melting furnace. The reason for limiting the diameter of the waste copper slag from 0,1 to 10 mm is that there is a fear of scattering when the waste copper slag is 0,1 mm or less, and when it is 10 mm or more, the melting operation is difficult.

이와같이 용융로에 투입된 폐PCB와 폐동슬래그를 용융시킴에 있어서 염기도를 0,7 ∼ 1,3에 맞춰 용융시키는 공정과 상기 용융공정을 거쳐 폐PCB에 함유되어있던 귀금속원소를 포집한 조금속(粗金屬)을 회수하는 공정과, 상기 조금속을 습식분리공정을 거쳐 귀금속원소를 추출하는 공정으로 이루어진다.Thus, in melting the waste PCB and the waste copper slag put into the furnace, crude metal is collected by collecting the noble metal element contained in the waste PCB through the process of melting basicity to 0,7 ~ 1,3. ) And a process of extracting the precious metal element through the wet separation process of the crude metal.

상기 용융로의 온도는 1100∼1300℃정도가 바람직하고, 상기 용융로 내의 염기도를 0,7 ∼ 1,3로 조절하는 이유는 상기 염기도에서 슬래그의 유동성이 가장 좋고, 귀금속원소의 추출을 용이하게 하기 때문이다. 또한 폐PCB의 용융작업에 있어서 열보존 및 조업의 편의성을 위해서 용융로에 투입되는 폐동슬래그의 중량은 원료전체중량의 1/5∼1/3정도로 하는 것이 바람직하다. 이는 폐동슬래그의 투입량이 1/5이하일 경우에는 용해작업이 곤란하고, 1/3이상인 경우에는 슬래그의 귀금속함량이 증가하기 때문이다.The temperature of the melting furnace is preferably about 1100 ~ 1300 ℃, the reason for adjusting the basicity in the melting furnace to 0,7 to 1,3 because the slag fluidity is the best in the basicity, and it is easy to extract precious metal elements to be. In the melting of waste PCB, it is preferable that the weight of the waste copper slag introduced into the melting furnace is about 1/5 to 1/3 of the total weight of the raw material for heat preservation and convenience of operation. This is because the melting operation is difficult when the input amount of the waste copper slag is less than 1/5, and the precious metal content of the slag increases when it is 1/3 or more.

본 발명에서 상기한 것처럼 폐기되던 폐동슬래그를 이용하여 폐PCB로 부터 귀금속원소를 추출하므로써 폐기물을 자원화할 수 있을 뿐만 아니라 공해방지의 효과와 저렴한 가격으로 귀금속원소를 회수할 수 있는 방법을 제공하기 위한 것으로, 바람직한 실시예들을 상기한 제조공정에 따라 시행하였다.By using the waste copper slag discarded as described above in the present invention, by extracting the precious metal element from the waste PCB, it is possible not only to recycle the waste material, but also to provide a method for recovering the precious metal element at a low cost and preventing pollution. Preferred embodiments were carried out according to the above-described manufacturing process.

제 1실시예First embodiment

폐PCB으로 부터 귀금속원소를 추출하는 실험을 직류아크 로와 플라즈마 로에서 시행하였다. 이때 용재로는 구리(Cu) 0.3∼3.0%, 납(Pb) 0.2∼4.8%, 아연(Zn) 0.1∼11.0%, 철(Fe) 32.1∼44.0%, 유황(S) 0.2∼2%, 산화칼슘(CaO)나 산화마그네슘(MgO) 0.1∼7.4%, 이산화규소(SiO2) 22.8∼37.5%, 산화알루미늄(Al2O3) 0.1∼8%, 산화철(Fe3O4) 3∼6%와 같은 화학적 성분을 갖는 폐동슬래그를 이용하였고, 슬래그의 염기도는 0.8로 맞추어 기저양극 접속을 하여 실시하였으며, 이때 슬래그를 용해하기 전에 로의 가열과 양전극간의 전기적 접촉이 양호하도록 코크스입자를 사용하였으며 이때의 온도는 1200℃이다. 상부와 노저전극의 사이에 스크랩을 장입후 아크발생후 폐PCB를 장입하여 약 180분간의 용융후 완전히 용융이 이루어진 후 출탕하였고, 조금속으로부터 습식분리공정을 통해 귀금속원소를 추출하였다.Experiments for the extraction of precious metals from the waste PCB were carried out in direct current and plasma furnaces. At this time, as a material, copper (Cu) 0.3-3.0%, lead (Pb) 0.2-4.8%, zinc (Zn) 0.1-11.0%, iron (Fe) 32.1-44.0%, sulfur (S) 0.2-2%, oxidation 0.1 to 7.4% of calcium (CaO) or magnesium oxide (MgO), 22.8 to 37.5% of silicon dioxide (SiO 2 ), 0.1 to 8% of aluminum oxide (Al 2 O 3 ), 3 to 6% of iron oxide (Fe 3 O 4 ) The waste copper slag with chemical composition was used, and the basicity of the slag was adjusted to 0.8, and the base anode was connected. The temperature is 1200 ° C. After charging the scrap between the top and the bottom electrode, after the arc generation, the waste PCB was charged and melted for about 180 minutes and then completely melted. The precious metal element was extracted from the crude metal through a wet separation process.

제 2실시예Second embodiment

실시예1과 동일한 성분의 폐동슬래그를 용재로 가스-산소버너 도가니로에서 동일한 방법으로 조금속을 제조하였고, 역시 습식분리공정을 통해 귀금속원소를 추출하였다.Crude metal was prepared in the same manner in a gas-oxygen burner crucible with waste copper slag having the same composition as in Example 1, and precious metal elements were also extracted through a wet separation process.

비교예Comparative example

종래의 용재, 즉 산화칼슘(CaO)를 이용하여 폐PCB를 용융하는 용융시험을 단전극 아크로에서 시행하였는데 슬래그의 염기도는 영향 요소를 줄이기 위해 다른 첨가물없이 산화칼슘(CaO)를 이용하여 전기아크로 내에서 제 1실시예와 동일한 방법으로 시행하였다.The melting test for melting waste PCB using conventional materials, namely calcium oxide (CaO), was carried out in a single-electrode arc furnace, and the basicity of slag was changed into electric arc furnace using calcium oxide (CaO) without other additives to reduce the influence factor. In the same manner as in the first embodiment.

실시예1, 실시예2, 실시예3에서 제조된 슬래그의 용출 특성을 평가하기위해 환경오염 공정시험법인 TCLP법에 따라 시료를 건조후 분쇄한 후 용출액과 혼합(1:20)하여 온도 22±3℃, 진폭4∼5cm분당 30±2회, 18±2시간 진탕기에서 진탕하여 여과한 후 항목별로 분석을 시행하였으며 귀금속원소의 잔여 함량을 조사하였다.In order to evaluate the elution characteristics of the slag prepared in Examples 1, 2 and 3, the samples were dried and pulverized according to the TCLP method, which is an environmental pollution process test method, and then mixed with the eluent (1:20) to obtain a temperature of 22 ±. After shaking at 3 ℃, amplitude of 4-5cm, 30 ± 2 times, and shaking at 18 ± 2 hours for filtration, each item was analyzed and the residual content of precious metals was investigated.

표에서는 제조된 슬래그의 침출특성을 나타낸다.The table shows leaching characteristics of the produced slag.

표 2. 슬래그의 침출특성 (단위:ppm)Table 2. Leaching Characteristics of Slag (Unit: ppm)

분석항목Analysis item 유해폐기물보류기준(한국)Hazardous Waste Retention Standards (Korea) 실시예 2Example 2 실시예 1Example 1 비교예Comparative example 가스산소버너Gas Oxygen Burner 직 류DC 플라즈마plasma 전로converter 전기로Electric furnace 전로converter 전기로Electric furnace 전로converter 전기로Electric furnace CuZnCuZn 3-3- 0.010.060.010.06 0.020.080.020.08 0.020.090.020.09 0.03 0.400.03 0.40 0.020.300.020.30 0.040.50.040.5 0.140.200.140.20

또한 표3에 나타난 바와같이 귀금속원소의 추출율을 비교하여 보더라도 종래의 용재와 비교하여 폐동슬래그를 사용할 때 오히려 귀금속원소의 추출율이 높았으며, 실시예 1, 2의 경우가 비교예보다 용융시 침출농도도 매우 낮았고, 용융중의 슬래그는 유동성이 좋았으며, 출탕이 원활하였다. 실제 조업측면에서 고려하더라도실시예 1과 2의 경우가 대단히 용융하기가 용이하였으며, 아크발생이 대단히 양호하였다.In addition, even when comparing the extraction rate of the precious metal element as shown in Table 3, the extraction rate of the precious metal element was higher when using the waste copper slag compared to the conventional solvent, and the leaching concentration during melting in Examples 1 and 2 than the comparative example It was also very low, the slag during melting had good fluidity and smooth tapping. Even in consideration of the actual operation aspects, Examples 1 and 2 were very easy to melt and arc generation was very good.

표 3. 귀금속원소의 추출율 (단위 : %)Table 3. Extraction rate of precious metal elements (unit:%)

비교예Comparative example 실시예 1Example 1 실시예 2Example 2 아 크 로Acro 직 류DC 플라즈마plasma 가스산소버너Gas Oxygen Burner CaO첨가CaO addition 전 로Before 전기로Electric furnace 전 로Before 전기로Electric furnace 전 로Before 전기로Electric furnace AuAu 8484 9292 9292 9494 9292 9191 9090 AgAg 8686 9191 9191 9090 8989 9393 9292 CuCu 8080 8888 8787 8888 8585 8484 8383 FeFe 7979 8888 8585 9090 8787 8585 8282 NiNi 8383 8787 8585 8989 8484 8484 8181 PdPd 8484 9393 8787 8787 8282 8888 8787

이상 살펴 본 바와 같이 본 발명은 동제련 과정에서 발생되는 폐동슬래그를 폐 전자스크랩의 인쇄회로기판으로 부터 귀금속원소 추출시 종래 고가의 용재 대체재로 사용하므로써 폐PCB 내의 귀금속원소를 저렴한 비용으로 생산할 수 있으며, 종래 폐 가전제품 등의 폐PCB의 폐기로인한 공해방지에 일조할 수 있으며, 종래의 용재와 비교하더라도 귀금속원소의 추출율이 오히려 나은 효과를 갖는 발명인 것이다.As described above, the present invention can produce the precious metal element in the waste PCB at low cost by using the waste copper slag generated during the copper smelting process as a substitute for conventional expensive materials when extracting the precious metal element from the printed circuit board of the waste electronic scrap. In addition, the present invention can contribute to the prevention of pollution due to the disposal of waste PCBs such as conventional home appliances, and is an invention having a better effect of extracting precious metal elements even when compared with conventional materials.

Claims (1)

폐PCB를 슈레더로 분쇄하는 공정과, 상기 공정을 거쳐 분쇄된 폐PCB를 그대로 용융로에 투입하거나 또는 분쇄된 폐PCB를 하소작업을 통해 용융로에 투입하고 용재에 의해 폐PCB로 부터 귀금속원소를 추출하는 귀금속건식용해법에 있어서 상기 폐PCB가 투입된 용융로에 화학적 조성이 구리(Cu) 0.3∼3.0%, 납(Pb) 0.2∼4.8%, 아연(Zn) 0.1∼11.0%, 철(Fe) 32.1∼44.0%, 유황(S) 0.2∼2%, 산화칼슘(CaO)나 산화마그네슘(MgO) 0.1∼7.4%, 이산화규소(SiO2) 22.8∼37.5%, 산화알루미늄(Al2O3) 0.1∼8%, 산화철(Fe3O4) 3∼6%로 이루어진 폐동슬래그를 직경 0,1 ∼ 10mm 크기로 분쇄하여 수분을 건조시킨 뒤 투입하고, 상기 폐PCB와 폐동슬래그를 염기도가 0,7 ∼ 1,3이 되도록 용융시키는 공정과, 상기 용융공정을 거쳐 폐PCB에 함유되어있던 귀금속원소를 포집한 조금속(粗金屬)을 회수하는 공정과, 상기 조금속을 습식분리공정을 거쳐 귀금속원소를 추출하는 공정으로 이루어짐을 특징으로 하는 폐기 동슬래그를 이용한 폐 인쇄회로기판의 귀금속원소 추출방법.The waste PCB is shredded and shredded waste PCB is put into the melting furnace as it is, or the pulverized waste PCB is put into the melting furnace through calcination, and the precious metal element is extracted from the waste PCB by the material. In the noble metal dry melting method, the chemical composition is 0.3 to 3.0% of copper (Cu), 0.2 to 4.8% of lead (Pb), 0.1 to 11.0% of zinc (Zn), and 32.1 to 44.0% of iron (Fe). , Sulfur (S) 0.2-2%, calcium oxide (CaO) or magnesium oxide (MgO) 0.1-7.4%, silicon dioxide (SiO 2 ) 22.8-37.5%, aluminum oxide (Al 2 O 3 ) 0.1-8%, The waste copper slag made of iron oxide (Fe 3 O 4 ) 3 to 6% is pulverized to a diameter of 0,1 to 10 mm and dried, followed by drying. Then, the waste PCB and the waste copper slag have a basicity of 0,7 to 1,3. A process of melting such that it is, a process of recovering a crude metal which has collected the noble metal elements contained in the waste PCB through the melting process; Group waste copper extraction noble metal element of the waste printed circuit board using the method of the slag in a bit characterized by a process constituted by any of extracting precious metal through a liquid separation process.
KR1019980005853A 1998-02-18 1998-02-18 Method for extracting the noble metal of the waste pcb using waste copper slag KR100250060B1 (en)

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