KR20000058674A

KR20000058674A - The method of extracting tin of high purity from dregs

Info

Publication number: KR20000058674A
Application number: KR1020000034938A
Authority: KR
Inventors: 김주형
Original assignee: 김주형; 이영도; 주식회사 도연산업
Priority date: 2000-06-23
Filing date: 2000-06-23
Publication date: 2000-10-05

Abstract

PURPOSE: A method of extracting high-purity Sn from Sn matters is provided to recycle high-purity Sn by extracting from Sn sludge during electroplating. CONSTITUTION: H2O2 as a neutralizing agent is added to a matters type Sn sludge at a weight ratio of 5:1 and then mixed for 5min. A sodium hydroxide dissolver, a sodium silicate dissolver and a soda ash dissolver are added to the Sn sludge at a weight ratio of 1.25:0.13:0.63:1 and mixed for about 15min. The Sn sludge is mixed with wheat flour and wheat chaff used as a reducer at a weight ratio of 1:0.03:0.003. Finally, a coke is added to the Sn sludge at a weight ratio of 0.03:1. The mixed Sn sludge is dried to 10% of moisture content. The dried Sn sludge is heated at a temperature of 1100-1300°C in a reduction furnace. Sn is obtained as the Sn is separated from the sludge by reduction.

Description

The method of extracting tin of high purity from dregs}

본 발명은 전기 주석도금공정시 부산물로 나오는 주석오니를 다시 주석으로 환원시켜 재활용할 수 있도록 하는 주석오니로부터 주석을 추출하는 방법에 관한 것이다.The present invention relates to a method for extracting tin from tin sludge which can be recycled by reducing tin sludge as a byproduct during the electroplating process.

일반적으로 통조림 캔이나 참치 캔 등과 같이 식품저장용기에는 대부분 인체에 무해하고 위생적인 주석을 전기도금하여 사용하고 있고, 그 외 각종 산업전반에 걸쳐 많은 제품들이 주석 전기도금을 실시하고 있다.In general, most food storage containers such as canned cans and tuna cans are electroplated using tin that is harmless to the human body and is hygienic, and many other products are electroplated in various industries.

이러한 주석 전기도금을 실시하다보면 도금시 쓰여지는 화학약품을 비롯한 각종 폐기물이 발생되는데, 그 폐기물에는 전기도금에 미처 사용되지 못한 주석이 다량 포함되어 있으며, 발생된 폐기물은 전량 폐기되고 있는 실정이다.When the tin electroplating is performed, various wastes, including chemicals used during plating, are generated, and the waste contains a large amount of tin which is not used in the electroplating, and the waste generated is entirely disposed of.

주석은 대부분 외국으로부터 수입에 의존하는 금속이기 때문에 그 가격이 매우 비쌈에도 불구하고, 주석이 다량 포함된 폐기물이 그대로 버려진다면 자원이 없는 우리나라로서는 막대한 외화낭비를 하고 있는 것이다.Although tin is mostly metal that depends on imports from foreign countries, even though its price is very expensive, if waste containing a large amount of tin is discarded as it is, it is a huge waste of foreign currency in Korea without resources.

이와 같이 주석전기도금시 버려지는 주석을 주석오니라고 하는데, 이는 순수한 주석이 아니기 때문에 다시 회수하여 사용할 방도가 없어 많은 비용이 낭비됨을 알면서도 그대로 폐기 처리되고 있는 것이다.As described above, tin discarded when tin is electroplated is called tin, which is not pure tin, and thus has no way of being recovered and used again.

본 발명은 이러한 종래의 폐단들을 해소하기 위해 창안한 것으로서, 그 목적은, 주석 전기도금 후 발생되어 폐기되는 주석오니를 모아 이를 고순도의 순수한 주석으로 환원시켜 재활용할 수 있도록 하므로써 막대한 외화 대체효과를 얻을 수 있도록 하는 전기도금시 발생된 주석오니로부터 고순도 주석을 추출하는 방법을 제공하는데 있다.The present invention was devised to solve these conventional wastes, and its purpose is to collect tin sludges generated and discarded after tin electroplating, and to reduce them to pure tin of high purity to obtain enormous foreign exchange effect. The present invention provides a method for extracting high purity tin from tin sludge generated during electroplating.

상기 목적을 달성하기 위한 본 발명의 수단은,Means of the present invention for achieving the above object,

전기도금공정시 얻어진 곤죽상태의 주석오니에 과산화수소(중화제)를 5 : 1의 중량비로 첨가하여 5분간 믹싱하는 1차믹싱공정과;A primary mixing step of mixing hydrogen peroxide (neutralizing agent) in a weight ratio of 5: 1 to the tin sludge obtained during the electroplating step and mixing for 5 minutes;

상기 1차믹싱공정을 거친 주석오니에 가성소다(액체 50%) 분해제를 1 : 1.25, 규산소다 분해제를 1 : 0.13, 소다회분해제를 1 : 0.63의 중량비로 첨가하여 약 15분간 배합기에서 믹싱하는 2차믹싱공정과;After adding the caustic soda (liquid 50%) dissolving agent to 1: 1.25, the soda silicate dissolving agent to 1: 0.13, and soda ash dissolving agent to the weight ratio of 1: 0.63 after the primary mixing process, A secondary mixing step of mixing;

상기 2차믹싱공정으로 믹싱된 주석오니에 밀가루 1 : 0,03 중량비와, 밀겨(환원제) 1 : 0,003중량비를 투입하여 믹싱하는 3차믹싱공정과;A tertiary mixing step of mixing by mixing the sludge mixed with the secondary mixing process with a flour ratio of 1: 0,03 and a wheat bran (reducing agent) 1: 00,003 by weight;

상기 3차믹싱공정을 거친 주석오니에 코크스(환원제)를 1 : 0.03의 중량비로 믹싱하는 4차믹싱공정과;A fourth mixing step of mixing the tin sludge coke (reducing agent) having undergone the third mixing step at a weight ratio of 1: 0.03;

믹싱완료된 주석오니를 수분함수율 10%가 될 때까지 건조시키는 건조공정과;A drying step of drying the mixed tin sludge to a water content of 10%;

건조된 주석오니를 환원로에 투입하여 1,100℃∼1,300℃ 정도로 가열하여 환원반응을 일으키는 환원반응공정; 및A reduction reaction process in which the dried tin sludge is added to a reduction furnace and heated to about 1,100 ° C. to 1,300 ° C. to cause a reduction reaction; And

환원되어 주석과 슬러지로 분리된 상태에서 주석을 추출하는 추출공정들로 구성하여 달성된다.Achievement consists of extraction processes that extract tin from the reduced and separated into tin and sludge.

이하, 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.

주석전기도금을 실시하다보면 화학물질이나 철분 및 도금에 이용되지 못하고 버려지는 주석들이 혼합된 폐기물이 발생된다.Tin electroplating results in a waste of chemicals, iron and tin that are not used for plating and are discarded.

이러한 폐기물 즉, 주석오니들을 수거하여 믹서에 넣고 중화제를 첨가하여 믹싱한다. 이때 주석오니와 중화제의 비율은 5 : 1의 중량비로 대략 5분간 혼합하며, 중화제는 과산화수소를 채택한다.(1차믹싱공정)These wastes, tin sludges, are collected and placed in a mixer and mixed with the addition of a neutralizer. At this time, the ratio of tin sludge and the neutralizing agent is mixed at a weight ratio of 5: 1 for about 5 minutes, and the neutralizing agent adopts hydrogen peroxide (primary mixing process).

이와 같이 중화제가 믹싱된 주석오니에 다시 분해제를 첨가하여 2차 믹싱한다.(2차믹싱공정)In this way, the disintegrating agent is added to the tin sludge mixed with the neutralizing agent and then mixed secondly (secondary mixing step).

분해제로는 가성소다와 규산소다 및 소다회 등을 사용하는데, 그 첨가량은 중화제가 믹싱된 주석오니에 액체 50%의 가성소다를 1 : 1.25의 중량비로 첨가하고, 규산소다를 1 : 0.13의 중량비로 첨가하며, 소다회를 1 : 0.63의 중량비로 첨가하여 약 15분간 배합기에서 믹싱한다.Caustic soda, sodium silicate, and soda ash are used as the decomposing agent, and the amount of caustic soda is 50% caustic soda in a weight ratio of 1: 1.25, and sodium silicate in a weight ratio of 1: 0.13. Add soda ash in a weight ratio of 1: 0.63 and mix in a blender for about 15 minutes.

2차믹싱공정이 끝나면 분해제가 믹싱된 주석오니에 환원제를 믹싱한다.(3차믹싱공정)After the secondary mixing process, the reducing agent is mixed into the tin sludge mixed with the disintegrating agent (tertiary mixing process).

환원제로는 밀가루, 밀겨, 연탄가루, 숯가루, 맥피, 톱밥, 방카씨유 등을 사용하는데, 이들 환원제 즉, 밀가루, 밀겨를 2차믹싱공정이 끝난 주석오니에 각각 1 : 0.03의 중량비로 믹싱한다.As the reducing agent, flour, wheat bran, briquette powder, charcoal powder, macpi, sawdust, banca seed oil, etc. are used, and these reducing agents, ie, flour and wheat bran, are mixed in a weight ratio of 1: 0.03 to tin sludge after the second mixing process. do.

또 미가루 밀겨 혼합한 후 이에 다시 코크스(환원제)를 1 : 003의 중량비로 첨가하여 믹싱한다.(4차 믹싱공정)In addition, coarse powder is mixed with wheat flour, and coke (reducing agent) is added thereto at a weight ratio of 1: 003 and mixed. (4th mixing process)

그리고 4차 믹성공정을 거친 주석오니를 수분함수율이 10% 이하가 될 때까지 건조시킨다.(건조공정)The tin sludge after the 4th mixing process is dried until the moisture content is 10% or less (drying process).

마지막으로 건조된 주석오니를 환원로에 투입시킨 후 1,100℃∼1,300℃로 열을 가하면 환원반응(화학반응)을 일으켜 금속과 슬래그로 분리되면서 양질의 주석이 환원되기 시작한다.Finally, when the dried tin sludge is added to a reduction furnace, heat is applied at 1,100 ° C. to 1,300 ° C. to cause a reduction reaction (chemical reaction), and the metal and slag are separated into high quality tin.

이러한 공정을 실시하면 환원로에서는 주석이 환원반응을 일으켜 주석과 각종 슬러지들이 비중의 차이로 층이 나뉘어져 분리되므로 이를 분리하면 99.6%의 고순도 주석을 용이하게 추출할 수가 있다.When this process is carried out, in the reduction furnace, tin causes a reduction reaction, and the tin and various sludges are separated and separated in layers due to the difference in specific gravity, and when separated, high purity tin of 99.6% can be easily extracted.

추출된 고순도 주석은 주석오니 100㎏에서 대략 20㎏∼30㎏정도를 얻을 수 있다.The extracted high purity tin can obtain approximately 20 kg to 30 kg in tin sludge.

이상에서 살펴본 바와 같이 본 발명은 주석 전기도금 후 발생되어 폐기되는 주석오니를 모아 이를 중화제와 분해제 및 환원제를 첨가하는 공정으로 고순도의 고순도 주석을 얻을 수 있으며, 이러한 고순도의 주석을 재활용할 수 있게 됨에 따라 주석도금에 따른 비용을 절감할 수가 있고, 나아가서는 막대한 외화 대체효과를 얻을 수 있는 효과가 있다.As described above, the present invention collects tin sludge generated and discarded after tin electroplating and adds a neutralizer, a disintegrating agent, and a reducing agent to obtain high purity tin of high purity, and to recycle such high purity tin. As a result, it is possible to reduce the cost of tin plating and to obtain a huge foreign currency substitution effect.

Claims

A primary mixing step of mixing hydrogen peroxide (neutralizing agent) in a weight ratio of 5: 1 to the tin sludge obtained during the electroplating step and mixing for 5 minutes;

After adding the caustic soda (liquid 50%) dissolving agent to 1: 1.25, the soda silicate dissolving agent to 1: 0.13, and soda ash dissolving agent to the weight ratio of 1: 0.63 after the primary mixing process, A secondary mixing step of mixing;

A tertiary mixing step of mixing by mixing the sludge mixed with the secondary mixing process with a flour ratio of 1: 0,03 and a wheat bran (reducing agent) 1: 00,003 by weight;

A fourth mixing step of mixing the tin sludge coke (reducing agent) having undergone the third mixing step at a weight ratio of 1: 0.03;

A drying step of drying the mixed tin sludge to a water content of 10%;

A reduction reaction process in which the dried tin sludge is added to a reduction furnace and heated to about 1,100 ° C. to 1,300 ° C. to cause a reduction reaction; And

A method for extracting high purity tin from tin sludge, characterized in that it consists of extraction processes for extracting tin in a state in which it is reduced and separated into tin and sludge.