KR100279019B1 - Wastewater Treatment Agent Extraction Method Using Waste Foundry Sand - Google Patents
Wastewater Treatment Agent Extraction Method Using Waste Foundry Sand Download PDFInfo
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- KR100279019B1 KR100279019B1 KR1019930018647A KR930018647A KR100279019B1 KR 100279019 B1 KR100279019 B1 KR 100279019B1 KR 1019930018647 A KR1019930018647 A KR 1019930018647A KR 930018647 A KR930018647 A KR 930018647A KR 100279019 B1 KR100279019 B1 KR 100279019B1
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Abstract
본 발명은 과잉 산화나트륨으로 인하여 이용 또는 활용방법이 없어 전량매립 또는 폐기되고 있는 폐주물사를 분쇄하여 물에 수용시켜 가성소다 수용액을 생산하여 산성폐수 처리체, 비누 왁스 등의 산업원료로 사용하고 수세된 폐주물사를 재활용 또는 가공처리하여 원료로 사용하는 방법이다.In the present invention, there is no use or utilization method due to excess sodium oxide, the waste foundry sand which is entirely embedded or discarded is crushed and accommodated in water to produce a caustic soda solution, which is used as industrial raw materials such as acidic wastewater treatment body, soap wax, and washed. Recycled or processed waste foundry sand is used as a raw material.
Description
본 발명은 과잉의 산화나트륨으로 인하여 이용 또는 활용방법이 없어 전량매립 또는 폐기처리되는 폐주물사를 수용(水溶)시켜 수용성 가성소다를 취출하여 산성폐수 처리제 및 비누 등 각종 산업의 원료로 하고 수용후의 폐주물사를 재활용함에 관한 것이다.The present invention has no use or utilization method due to excess sodium oxide to accommodate the waste foundry sand that is entirely embedded or discarded to extract water-soluble caustic soda as raw materials of various industries, such as acidic wastewater treatment agent and soap, and the waste foundry sand after receiving It's about recycling.
폐주물사(廢鑄物砂)는 주조공정의 필수소재인 사형(Sand Mold)의 파쇄물로써 대부분 매립, 폐기되고 있으며 그 발생량은 11만톤/년이상으로 발생되고 있으며 재활용이 전무한 상태이다.Waste casting sand is a crushed product of sand mold, which is an essential material of the casting process, and most of it is landfilled and discarded, and its amount is generated more than 110,000 tons / year and there is no recycling.
주조산업에서 부산되는 폐주물사의 발생공정은 다음과 같다.The generation process of waste foundry sand produced in the casting industry is as follows.
① SiO290% 이상의 고순도 규사(珪砂, Sand)① High purity silica sand with more than 90% of SiO 2
② 규사의 바인다(BINDER)는 규산소다로서 CO2GAS 또는 가열하면 경화되는 특성이 있음.② that the binder (BINDER) is a characteristic which is cured when GAS CO 2 or by heating a sodium silicate, a silica sand.
③ 통상적 금형 또는 목형에 규산소다와 혼련된 규사를 채워 가압하고 CO2GAS 또는 열을 가하여 금형, 목형과 같은 형상으로 경화시킨다.③ Ordinary mold or wooden mold with silicate kneaded with sodium silicate is filled and pressurized, and CO 2 GAS or heat is applied to harden the mold or wooden mold.
④ 금형과 경화된 사형(Sand Mold)를 분리.④ Separate mold and hardened sand mold.
⑤ 사형에 용융된 주물용탕을 주입⑤ Inject molten casting molten metal into sand mold
⑥ 사형을 파쇄하여 주물제품 인출⑥ Withdraw the casting product by crushing the death penalty
⑦ 폐주물사 발생⑦ Generation of waste foundry sand
사형의 바인다인 규산소다의 제조방법은 습식과 건식법이 있으며 통상적 습식은 가성소다(NaOH) 용액과 규사(硅砂) 또는 규산질(硅酸質) 원료를 오토브레이크에 넣어 가압연기를 흡입 반응시켜 여과하고 불용물을 제거하여 찜솥에 넣어 농축하였는 것이다.There are two methods for producing sandin-type soda silicate, wet and dry, and the usual wet method is caustic soda (NaOH) solution and silica sand or siliceous raw material into an auto brake and suction pressurized smoke is filtered. Insoluble matters were removed and concentrated in a steamer.
이를 화학식으로 보면If you look at it as a chemical formula
2NaOH+nSiO2=Na2O, nSiO2, H2O으로써2NaOH + nSiO 2 = Na 2 O, nSiO 2 , H 2 O
규산소다 2호를 화학성분 분석결과 다음과 같았다.Sodium silicate 2 was analyzed as follows.
[규산소다의 성분조성][Composition of Sodium Silicate]
상기 조성표와 같이 규산소다를 주조용 규사와 혼련, 경화, 용탕 주입 냉각공정을 거친 폐주물사의 표면에는 산화나트륨(Na2O) 성분이 과다하게 조성되어 있음을 알 수 있다.As shown in the composition table, it can be seen that the sodium oxide (Na 2 O) component is excessively formed on the surface of the waste foundry sand that has undergone kneading, hardening, and molten metal casting with silicate for casting.
산화나트륨은 상온에서 물(水)에 용이하게 용해되어 가성소다가 된다. 이를 화학식으로 보면Sodium oxide readily dissolves in water at room temperature to form caustic soda. If you look at it as a chemical formula
Na2O+H2O→2NaOH로 된다.Na 2 O + H 2 O → 2NaOH.
상기와 같이 폐주물사를 수용시켜 취출한 수용성 가성소다는 종래의 수용액 가성소다와 같이 금속 등을 침해하는 강력한 산화제의 특성을 지니고 있어 도금, 피혁산업의 산성배출수중화제, 특히 표백제, 유지, 왁스, 비누 등의 산업원료로 사용하고 또, 폐주물사의 폐기원인인 산화나트륨은 함량이 높을수록 규사의 용융점을 저하 시켜 주물용탕 주입시 용탕과 규사가 같이 용융되어 주물제품 표면에 악영향을 끼치는 것을 산화나트륨의 수용(水溶) 용이성을 이용하여 가성소다 용액을 취출하고난 폐주물사는 산화나트륨이 현격히 감소되어 규사의 용융에 영향을 끼치지 못하므로 주물사로 재사용이 가능하다.As mentioned above, the water-soluble caustic soda taken out from the waste foundry sand has the characteristics of a strong oxidizing agent that invades metals like the conventional aqueous solution caustic soda. Sodium oxide, which is the waste source of waste foundry, decreases the melting point of silica sand as the content is higher. The waste foundry sand, which has been extracted caustic soda solution with ease of use, can be reused as foundry sand because sodium oxide is significantly reduced, which does not affect the melting of silica sand.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930018647A KR100279019B1 (en) | 1993-09-16 | 1993-09-16 | Wastewater Treatment Agent Extraction Method Using Waste Foundry Sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930018647A KR100279019B1 (en) | 1993-09-16 | 1993-09-16 | Wastewater Treatment Agent Extraction Method Using Waste Foundry Sand |
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| Publication Number | Publication Date |
|---|---|
| KR950008357A KR950008357A (en) | 1995-04-17 |
| KR100279019B1 true KR100279019B1 (en) | 2001-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019930018647A KR100279019B1 (en) | 1993-09-16 | 1993-09-16 | Wastewater Treatment Agent Extraction Method Using Waste Foundry Sand |
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- 1993-09-16 KR KR1019930018647A patent/KR100279019B1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR950008357A (en) | 1995-04-17 |
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