KR20010028571A - Method for disposal of red mud and agglutinator for waste water prepared by the same - Google Patents

Method for disposal of red mud and agglutinator for waste water prepared by the same Download PDF

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Publication number
KR20010028571A
KR20010028571A KR1019990040877A KR19990040877A KR20010028571A KR 20010028571 A KR20010028571 A KR 20010028571A KR 1019990040877 A KR1019990040877 A KR 1019990040877A KR 19990040877 A KR19990040877 A KR 19990040877A KR 20010028571 A KR20010028571 A KR 20010028571A
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South Korea
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wastewater
acid
sludge
sulfuric acid
red mud
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KR1019990040877A
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Korean (ko)
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김용상
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유두현
주식회사 미래로종합개발
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Publication of KR20010028571A publication Critical patent/KR20010028571A/en

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • 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
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/0646—Separation of the insoluble residue, e.g. of red mud
    • C01F7/0653—Separation of the insoluble residue, e.g. of red mud characterised by the flocculant added to the slurry

Abstract

PURPOSE: A treatment method of red mud and a waste water settling agent prepared thereby are provided, which can treat the red mud generated from Bayer process to extract aluminium hydroxide from bauxite using acid such as hydrochloric acid or sulfuric acid, so that the derived byproduct can be used as a waste water settling agent. CONSTITUTION: The method comprises the following steps: (i) pouring 735g of water in a glass reactor of 4L equipped with a condenser and stirring it with adding 1629g of concentrated sulfuric acid; (ii) adding 1 kg of red mud to the mixture slowly for 30 min to make slurry; (iii) heating the slurry at 50deg.C for 30 min, reacting it, and filtering it; (iv) washing the cake on filter paper with 1000mL of water; and (v) mixing this wash water with the filtrate to yield 3913g of a waste water settling agent.

Description

적색오니의 처리방법 및 이를 이용하여 제조된 폐수침강제 {Method for disposal of red mud and agglutinator for waste water prepared by the same}Treatment method of red sludge and wastewater precipitant prepared by using the same {Method for disposal of red mud and agglutinator for waste water prepared by the same}

본 발명은 보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 폐기물 적색오니(red mud)를 산을 이용하여 처리함을 특징으로 하는 폐기물 처리방법, 이 방법에 따른 부산물로서 수득됨을 특징으로 하는 폐수침강제, 및 폐수침강제를 제조하고 남은 슬러리로 백벽돌 등의 원료로 사용할 수 있는 슬러지에 관한 것이다.The present invention is characterized in that the waste red sludge generated in the Bayer process for extracting aluminum hydroxide from the bauxite is treated with an acid using a waste treatment method, characterized in that it is obtained as a by-product according to this method. The present invention relates to a sludge which can be used as a raw material such as a white brick as a slurry remaining after producing a wastewater precipitate and a wastewater precipitate.

폐수의 효율적인 처리는 산업화가 고도로 진행된 현대에 와서 가장 큰 문제중의 하나로 대두되었다. 따라서, 폐수를 처리하기 위하여 여러가지 방법들이 개발되었으며, 그중 하나가 무기화합물을 이용하여 폐수중의 여러가지 성분을 응집시켜 침강시키는 방법이다. 이러한 목적으로 사용되는 여러 무기화합물중 대표적인 것으로 염화제2철(FeCl3), 황산제2철[Fe2(SO4)3], 염화알루미늄(AlCl3) 또는 황산알루미늄[Al2(SO4)3] 등을 언급할 수 있다. 이들은 폐수중의 여러 물질과 화학적으로 반응하여 응집체를 형성시키고 그 크기를 키움으로써 응집체 자체의 무게로 인해 바닥으로 침강하도록 유도한다.Efficient treatment of wastewater has emerged as one of the biggest problems in the highly industrialized modern times. Therefore, various methods have been developed for treating wastewater, and one of them is a method of agglomeration and sedimentation of various components in wastewater using inorganic compounds. Representative examples of various inorganic compounds used for this purpose are ferric chloride (FeCl 3 ), ferric sulfate [Fe 2 (SO 4 ) 3 ], aluminum chloride (AlCl 3 ) or aluminum sulfate [Al 2 (SO 4 ) 3 ], and the like. They chemically react with various substances in the waste water to form aggregates and increase their size, causing them to settle to the bottom due to the weight of the aggregates themselves.

그러나, 상기 무기화합물들은 지금까지 순수한 화합물 상태로 폐수침강제로서 사용되어 왔으며, 따라서, 이들을 이용하기 위해서는 별도의 제조, 분리, 정제 등의 공정을 거쳐야 했고, 그에 따라 상당한 비용이 소요되었던 것도 사실이다.However, these inorganic compounds have been used as wastewater sedimentation agents in the form of pure compounds until now, and therefore, the use of them requires a separate manufacturing, separation, and purification process, and therefore, it is a fact that a considerable cost is required. .

이에 본 발명자들은 저렴하면서도 효과적이고 편리하게 폐수를 처리하기 위한 방법을 다각도로 모색하였다. 그 결과, 바이엘 공정에서 발생되는 폐기물인 적색오니를 산으로 처리하면 지금까지 단순폐기되고 있던 이 산업폐기물을 용이하게 처리할 수 있을 뿐아니라 그에 따른 부산물로서 폐수침강제가 얻어지며, 더구나 이 폐수침강제는 기존에 가장 우수하다고 알려진 염화제2철에 비해서도 우수한 폐수처리효과를 나타냄을 확인하고 본 발명을 완성하게 되었다.Accordingly, the inventors have sought various ways to treat wastewater at low cost, and effectively and conveniently. As a result, by treating red sludge, which is a waste generated in Bayer process with acid, it is not only easy to treat this industrial waste that has been simply discarded until now, but also a wastewater sedimentation agent is obtained as a by-product. Was confirmed to exhibit an excellent wastewater treatment effect compared to ferric chloride, which is known to be the best, and completed the present invention.

따라서, 본 발명은 보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 폐기물 적색오니를 산을 이용하여 처리함을 특징으로 하는 폐기물 처리방법을 제공한다.Accordingly, the present invention provides a waste treatment method comprising treating waste red sludge generated in a Bayer process for extracting aluminum hydroxide from bauxite using an acid.

본 발명은 또한, 보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 폐기물 적색오니를 산으로 처리하여 제조됨을 특징으로 하는 폐수침강제를 제공한다.The present invention also provides a wastewater settling agent, which is prepared by treating waste red sludge generated in a Bayer process for extracting aluminum hydroxide from bauxite with an acid.

더구나, 본 발명자들은 상기 적색오니를 산으로 처리하면 부산물로서 슬러지가 얻어지는데, 이 슬러지는 백벽돌, 보도블럭, 시멘트, 경량골재 등의 우수한 원료로 사용될 수 있음을 또한 발견하였으며, 따라서 본 발명은 상기 슬러지를 제공함을 또다른 목적으로 한다.Moreover, the present inventors have also found that sludge is obtained as a by-product when the red sludge is treated with acid, and the sludge can be used as an excellent raw material such as white brick, sidewalk block, cement, lightweight aggregate, etc. Another object is to provide the sludge.

본 발명에서는 보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 적색오니를 본 발명에서 목적하는 폐수침강제를 제조하기 위한 원료물질로서 사용하였다. 즉, 산업폐기물인 적색오니를 처리하는 과정에서 유용한 폐수침강제가 제조되는 것이다.In the present invention, the red sludge generated in the Bayer process for extracting aluminum hydroxide from the bauxite was used as a raw material for producing the wastewater precipitate. In other words, the wastewater sedimentation agent which is useful in the process of treating industrial waste red sludge is manufactured.

바이엘 공정(Bayer Process)은 100여년 이전에 개발되어 그때로부터 수산화알루미늄을 제조하는데 사용되어온 가장 보편적인 방법으로서 당업계에서 아직도 많이 활용되고 있다(참조: Aluminum Oxide, Vol. A 1, pp567-593). 바이엘공정을 수행하면 적색오니라고 불리는 일종의 혼합물이 수득되는데, 통상, 5 내지 35중량의 Fe2O3를 함유하는 보오크사이트에 대해 바이엘 공정을 적용하였을 때 본 발명에 따라 사용하기에 적합한 조성을 갖는 적색오니가 얻어진다(표 1 참조).Bayer Process is the most common method developed in more than 100 years and has been used since then to manufacture aluminum hydroxide. It is still widely used in the art (Aluminum Oxide, Vol. A 1, pp567-593). . Performing the Bayer process yields a kind of mixture called red sludge, usually having a composition suitable for use according to the invention when the Bayer process is applied to bauxite containing 5 to 35 weight Fe 2 O 3 . Red sludge is obtained (see Table 1).

적색오니의 주성분으로는 Al(OH)3, Fe2O3, SiO2, TiO2및 Ca(OH)2을 언급할 수 있으며, 이들은 무기산과 반응함으로써 상응하는 무기염을 형성하게 된다. 반응결과 생성된 무기염들은 바로 기존에 폐수침강제로서 사용되어온 여러 무기물과 동일한 것이었으며, 본 발명자들은 이점에 착안하여 폐기물을 재활용한 폐수침강제를 제조하고자 하였다. 그러나, 본 발명의 방법에 따라 얻어진 폐수침강제에 대해 폐수처리효과를 조사하기 위한 실험을 수행한 결과, 놀랍게도 본 발명이 제공하는 폐수침강제는 기존에 가장 우수하다고 알려진 염화제2철이나 황산제2철에 비해서도 폐수 침강속도가 빠르고 10 내지 20가량 향상된 화학적산소요구량(COD)의 감소 효과를 나타낼 뿐아니라, 침전슬러지층의 부피는 기존의 방법에 비해 20 내지 50가량 감소시키고 있음을 확인할 수 있었다. 기존의 폐수침강제를 얻기 위해서는 일부러 많은 비용을 들여가며 순수한 무기물을 제조해야만 했던 사실을 돌이켜보면 이와 같이 우수한 본 발명의 효과는 더욱더 값진 것이라고 할 수 있다. 따라서, 본 발명의 가장 큰 특징은 산업폐기물로서 경제적, 환경적으로 문제가 될 뿐아니라 지금까지는 재활용이 불가능한 것으로 인식되어온 적색오니를 용이하게 처리할 뿐 아니라, 이 과정에서 우수한 폐수침강제를 제조한다는 점에 있다.The main components of the red sludge may be Al (OH) 3 , Fe 2 O 3 , SiO 2 , TiO 2 and Ca (OH) 2 , which react with inorganic acids to form the corresponding inorganic salts. The inorganic salts produced as a result of the reaction were the same as those of various inorganic materials that have been used as wastewater sedimentation agents, and the present inventors have made an effort to produce wastewater sedimentation agents that recycled waste. However, as a result of conducting experiments to investigate the wastewater treatment effect on the wastewater sedimentation agent obtained by the method of the present invention, surprisingly, the wastewater sedimentation agent provided by the present invention is known to have the best ferric chloride or sulfate Compared to the ferric iron, the sedimentation sludge layer volume was reduced by about 20 to 50 compared to the existing method, as well as the reduction of chemical oxygen demand (COD), which is 10 to 20 times faster than the sedimentation rate. . In view of the fact that in order to obtain the existing wastewater sedimentation agent, a pure inorganic material must be manufactured at a high cost, such an excellent effect of the present invention can be said to be even more valuable. Therefore, the biggest feature of the present invention is not only an economical and environmental problem as industrial waste, but also an easy treatment of red sludge, which has been recognized as not possible to be recycled until now, and also an excellent wastewater precipitation agent in this process. Is in point.

본 발명에 따라 적색오니를 처리하기 위해서는 어떤 무기산이라도 사용될 수 있으나, 그중에서도 염산 또는 황산이 바람직하다. 산은 통상 농축된 상태의 것을 사용한다. 진한 염산인 경우 처리될 적색오니를 기준으로 하여 1.5 내지 5.0중량배, 바람직하게는 3.0 내지 4.0중량배 사용하며, 진한황산인 경우 동일기준으로 1.0 내지 4.0중량배, 바람직하게는 1.0 내지 2.0중량배의 양으로 사용한다. 산을 상기 넓은 범위의 하한 미만으로 사용하는 경우에는 미반응으로 인한 침강제의 농도저하, 슬러지양의 증가 및 슬러지중의 Fe2O3, Al2O3양의 증가로 인한 슬러지 활용의 어려움과 같은 문제점이 발생할 수 있으며, 상한 초과의 양으로 사용하는 경우에는 반응후 남은 과량의 산이 존재함으로 인해 정제가 용이하지 않다는 문제점이 있을 수 있다. 이때, 처리시간 및 처리시의 온도는 각각 30분 내지 2시간 및 40 내지 100℃로 유지하는 것이 적당하다. 산의 사용량, 시간 및 온도는 처리될 적색오니의 양이나 산의 종류, 농도 및 기타 다른 조건에 따라 상기 범위내에서 변화할 수 있으며, 그 선택은 당업자에 의해 용이하게 수행될 수 있다.Any inorganic acid may be used to treat red sludge according to the present invention, but hydrochloric acid or sulfuric acid is preferred. Acids are usually used in concentrated form. In case of concentrated hydrochloric acid, 1.5 to 5.0 weight times, preferably 3.0 to 4.0 weight times, based on the red sludge to be treated, and in case of concentrated sulfuric acid, 1.0 to 4.0 weight times, preferably 1.0 to 2.0 weight times Use in quantity. When the acid is used below the lower limit of the above wide range, it is difficult to utilize the sludge due to the decrease of the concentration of the settling agent due to the unreacted reaction, the increase of the amount of sludge and the increase of the amount of Fe 2 O 3 and Al 2 O 3 in the sludge. The same problem may occur, and when used in an amount exceeding the upper limit, there may be a problem that purification is not easy due to the presence of excess acid remaining after the reaction. At this time, the treatment time and the temperature at the treatment are appropriately maintained at 30 minutes to 2 hours and 40 to 100 ° C, respectively. The amount, time and temperature of the acid may vary within this range depending on the amount of red sludge to be treated or the type, concentration and other conditions of the acid, and the selection can be easily carried out by those skilled in the art.

예를들어, 염산 또는 황산을 무기산으로 사용한 경우 이들 산이 적색오니중의 무기화합물들과 반응하는 과정을 반응식으로 나타내면 다음과 같다.For example, when hydrochloric acid or sulfuric acid is used as the inorganic acid, the reaction of these acids with the inorganic compounds in the red sludge is represented by the following scheme.

Al(OH)3+ 3HCl → AlCl3+ 3H2OAl (OH) 3 + 3HCl → AlCl 3 + 3H 2 O

Fe2O3+ 6HCl → 2FeCl3+ 3H2OFe 2 O 3 + 6HCl → 2FeCl 3 + 3H 2 O

Ca(OH)2+ 2HCl → CaCl2+ 2H2OCa (OH) 2 + 2HCl → CaCl 2 + 2H 2 O

2Al(OH)3+ 3H2SO4→ Al2(SO4)3+ 6H2O2Al (OH) 3 + 3H 2 SO 4 → Al 2 (SO 4 ) 3 + 6H 2 O

Fe2O3+ 3H2SO4→ Fe2(SO4)3+ 3H2OFe 2 O 3 + 3H 2 SO 4 → Fe 2 (SO 4 ) 3 + 3H 2 O

상기 반응식 1 및 2로부터 알 수 있듯이, 적색오니와 염산을 반응시키면 알루미늄, 철 및 칼슘의 염화물이 얻어지며, 황산을 반응시키면 알루미늄 및 철의 황산염이 얻어진다. 이와 같이 생성된 무기염들은 산의 사용량을 포함한 여러 반응조건의 변화에 따라 그 성분조성이 달라질 수 있다. 예를들어, 염산 36용액을 적색오니 1000g에 대해 3211g의 양으로 사용하여 반응시킨 경우, 수득된 폐수침강제는 AlCl3: FeCl3: CaCl2을 약 20.9 : 17.1 : 4.7의 중량비로 함유하고 있으며(실시예 2 참조), 황산 98용액을 적색오니 1000g에 대해 1629g의 양으로 사용하여 반응시킨 경우, 수득된 폐수침강제는 Al2(SO4)3: Fe2(SO4)3 를 약 13.3 : 21.5의 중량비로 함유하고 있다(실시예 1 참조).As can be seen from Schemes 1 and 2, the reaction of red sludge with hydrochloric acid yields chlorides of aluminum, iron and calcium, and the reaction of sulfuric acid yields sulfates of aluminum and iron. The inorganic salts produced in this way may vary in composition depending on various reaction conditions, including the amount of acid used. For example, when 36 hydrochloric acid solution is reacted using an amount of 3211 g with respect to 1000 g of red sludge, the obtained wastewater precipitate is AlCl3: FeCl3CaCl2Is contained in a weight ratio of about 20.9: 17.1: 4.7 (see Example 2), and when the sulfuric acid 98 solution is reacted with an amount of 1629 g with respect to 1000 g of red sludge,2(SO4)3: Fe2(SO4)3 Is contained in a weight ratio of about 13.3: 21.5 (see Example 1).

상기 방법으로 적색오니를 처리하여 폐수침강제를 얻는 한편으로 부산물로서 슬러지가 생성된다. 이 슬러지는 백벽돌, 보도블럭, 시멘트, 경량 골재 등의 세라믹 원료로 사용할 수 있으므로, 본 발명은 이 점에서도 매우 유리한 효과를 발휘하고 있다. 적색오니를 염산으로 처리하여 폐수침강제를 제조하는 경우 얻어지는 슬러지의 주성분은 SiO2및 TiO2이며 원료물질인 적색오니를 기준으로 하여 20정도의 양으로 얻어진다. 또한, 황산으로 처리한 경우의 슬러지 주성분은 SiO2, TiO2, 및 CaSO4이며, 원료물질인 적색오니를 기준으로 하여 45정도의 양으로 슬러지가 얻어진다.The sludge is treated in this way to obtain a wastewater settling agent and sludge is produced as a by-product. Since this sludge can be used as a ceramic raw material, such as a white brick, a sidewalk block, cement, and lightweight aggregate, this invention exhibits the very advantageous effect also in this point. When the sludge is treated with hydrochloric acid to prepare wastewater sedimentation agents, the main components of the sludge obtained are SiO 2 and TiO 2 , which are obtained in an amount of about 20 based on the raw sludge. In the case of treatment with sulfuric acid, the sludge main components are SiO 2 , TiO 2 , and CaSO 4 , and sludge is obtained in an amount of about 45 based on red sludge as a raw material.

이하, 본 발명을 하기 실시예에 의거하여 보다 구체적으로 설명한다. 그러나, 이들 실시예는 본 발명을 설명하기 위한 것일 뿐, 어떤 의미로든 본 발명의 범위가 이들 실시예로 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail based on the following examples. However, these examples are only for illustrating the present invention, and the scope of the present invention in any sense is not limited to these examples.

실시예 1: 황산을 이용한 폐수침강제의 제조Example 1 Preparation of Wastewater Precipitant Using Sulfuric Acid

본 실험에서는 KS(한국공업규격), ASTM(미국공업 시험규격) 및 JIS(일본공업규격)에 의한 분석방법을 사용하였다.In this experiment, KS (Korean Industrial Standard), ASTM (American Industrial Test Standard) and JIS (Japanese Industrial Standard) analysis methods were used.

Fe2O3가 17함유된 보오크사이트로부터 바이엘공정에 의해 수산화알루미늄을 제조하는 과정에서 슬러리인 적색오니를 수득하였다. 컨덴서(Condensor)가 부착된 4ℓ유리반응기에 735g의 물을 넣고 교반하면서 진한황산(98) 1629g을 서서히 가한다음 상기 수득한 적색오니 1kg을 30분에 걸쳐 서서히 가하여 슬러리화(Reslurry화)하였다. 혼합물을 50℃에서 30분간 가열하여 반응시킨 후 여과하고 여과기 상부에 1000㎖의 물을 사용하여 케이크를 세척한후 이 세척액을 여액과 혼합하여 반투명 액상의 폐수침강제 3913g을 수득하였다.Red sludge as a slurry was obtained in the process of producing aluminum hydroxide from the bauxite containing Fe 2 O 3 by a Bayer process. 735 g of water was added to a 4 L glass reactor to which a condenser was attached, and 1629 g of concentrated sulfuric acid (98) was slowly added while stirring. The mixture was heated and reacted at 50 ° C. for 30 minutes, filtered, washed with a cake using 1000 ml of water on the top of the filter, and the washing solution was mixed with the filtrate to obtain 3913 g of a wastewater precipitate for a translucent liquid.

황산과 반응시키기 전의 적색오니 조성 및 반응후 슬러리의 조성은 하기 표 1에 나타내었고, 폐수침강제 제조시의 황산 및 물의 사용량과 슬러지 발생량은 하기 표 2에 나타내었으며, 제조된 폐수침강제의 조성과 생산량은 하기 표 3에 나타내었다.The composition of the red sludge before the reaction with sulfuric acid and the composition of the slurry after the reaction are shown in Table 1 below, and the amount of sulfuric acid and water used in the preparation of the wastewater precipitate and the amount of sludge generation are shown in Table 2 below. And the yield is shown in Table 3 below.

실시예 2: 염산을 이용한 폐수침강제의 제조Example 2: Preparation of Wastewater Precipitant Using Hydrochloric Acid

본 실험에서는 KS(한국공업규격), ASTM(미국공업 시험규격) 및 JIS(일본공업규격)에 의한 분석방법을 사용하였다.In this experiment, KS (Korean Industrial Standard), ASTM (American Industrial Test Standard) and JIS (Japanese Industrial Standard) analysis methods were used.

컨덴서(Condensor)가 부착된 2ℓ유리반응기에 진한염산(36) 3211g을 서서히 가한다음 적색오니 1kg을 30분에 걸쳐 서서히 가하여 슬러리화(Reslurry화)하였다. 혼합물을 50℃에서 30분간 가열하여 반응시킨 후 여과하여 여액을 취함으로써 반투명 액상의 폐수침강제 4011g을 수득하였다.3211 g of concentrated hydrochloric acid (36) was slowly added to a 2 L glass reactor equipped with a condenser, and then 1 kg of red sludge was slowly added over 30 minutes to slurry. The mixture was heated and reacted at 50 ° C. for 30 minutes, filtered and the filtrate was taken to obtain 4011 g of a semi-transparent liquid wastewater precipitate.

염산과 반응시키기 전의 적색오니 조성 및 반응후 슬러지의 조성은 하기 표 1에 나타내었고, 폐수침강제 제조시의 염산 및 물의 사용량과 슬러지 발생량은 하기 표 2에 나타내었으며, 제조된 폐수침강제의 조성과 생산량은 하기 표 3에 나타내었다.The composition of the red sludge before the reaction with hydrochloric acid and the composition of the sludge after the reaction are shown in Table 1 below. The amount of hydrochloric acid and water and the amount of sludge generation during the preparation of the wastewater precipitate are shown in Table 2 below. And the yield is shown in Table 3 below.

적색오니 및 슬러지의 조성Composition of red sludge and sludge 1000g 적색오니1000g red sludge 염산반응 후 슬러지Sludge after hydrochloric acid 황산반응 후 슬러지Sludge after sulfuric acid reaction 성분ingredient 양(g)Volume (g) 성분ingredient 양(g)Volume (g) 성분ingredient 양(g)Volume (g) Al2O3 Al 2 O 3 163163 Al2O3 Al 2 O 3 2.42.4 Al2O3 Al 2 O 3 8.18.1 Na2ONa 2 O 9090 Na2ONa 2 O 0.40.4 Na2ONa 2 O 2.72.7 SiO2 SiO 2 148148 SiO2 SiO 2 148148 SiO2 SiO 2 148148 Fe2O3 Fe 2 O 3 338338 Fe2O3 Fe 2 O 3 0.80.8 Fe2O3 Fe 2 O 3 2.32.3 CaOCaO 9696 CaOCaO 0.40.4 CaSO4 CaSO 4 233.1233.1 TiO2 TiO 2 7676 TiO2 TiO 2 4040 TiO2 TiO 2 42.342.3 LOI(1000℃)LOI (1000 ℃) 8989 LOILOI 88 LOILOI 13.513.5 합계Sum 10001000 합계Sum 200200 합계Sum 450450

주) 표 1에서 LOI는 loss of ignition을 의미한다.NOTE LOI in Table 1 means loss of ignition.

폐수침강제 제조시의 원료사용량 및 슬러지 발생량Raw Material Consumption and Sludge Generation from Wastewater Precipitation 구분division 염산반응시Hydrochloric acid 황산반응시Sulfuric acid reaction 적색오니 사용량Red sludge usage 1000g1000 g 1000g1000 g 염산(36) 사용량Hydrochloric acid (36) consumption 3211g3211 g -- 황산(98) 사용량Sulfuric acid (98) consumption -- 1629g1629 g 물 사용량Water usage 0g0g 1735g1735 g 슬러지 발생량Sludge Generation 200g200 g 450g450 g

폐수침강제의 생산량 및 주요성분의 조성Production of Wastewater Precipitants and Composition of Main Components 염산 반응시During hydrochloric acid 황산 반응시Sulfuric acid reaction 성분ingredient 농도(중량)Concentration (weight) 생산량(g)Output (g) 성분ingredient 농도(중량)Concentration (weight) 생산량(g)Output (g) AlCl3 AlCl 3 20.920.9 840840 Al2(SO4)3 Al 2 (SO 4 ) 3 13.313.3 519.8519.8 FeCl3 FeCl 3 17.117.1 684.5684.5 Fe2(SO4)3 Fe 2 (SO 4 ) 3 21.521.5 840.6840.6 CaCl2 CaCl 2 4.74.7 188.7188.7 기타Etc 65.265.2 2552.62552.6 기타Etc 57.357.3 2297.82297.8 합계Sum 100.0100.0 40114011 합계Sum 100.0100.0 39133913

실시예 3: 폐수침강효과 비교시험Example 3: Wastewater Sedimentation Effect Comparison Test

본 실험에서는 KS(한국공업규격), ASTM(미국공업 시험규격) 및 JIS(일본공업규격)에 의한 분석방법을 사용하였다.In this experiment, KS (Korean Industrial Standard), ASTM (American Industrial Test Standard) and JIS (Japanese Industrial Standard) analysis methods were used.

본 실험에서는 본 발명에 따른 상기 실시예 1 및 2의 폐수침강제를 사용하여 폐수처리공장의 유기물폐수를 처리하였으며, 그 결과를 기존의 시판되는 폐수침강제 FeCl3및 Fe2(SO4)3와 비교하였다.In this experiment, the organic wastewater of the wastewater treatment plant was treated using the wastewater sedimentation agents of Examples 1 and 2 according to the present invention, and the results of the commercial wastewater sedimentation agents FeCl 3 and Fe 2 (SO 4 ) 3 were obtained. Compared with.

유리반응기에 들어있는 유기물 폐수에 본 발명에 따른 폐수침강제 또는 시판되는 폐수침강제를 각각 하기 표 4에 나타낸 바와 같은 양으로 투입하였다. 혼합물을 교반한 지 20분 후에 처리된 폐수를 취하여 침전슬러리의 양 및 COD를 측정하였다. 결과는 표 4에 나타내었다.To the organic wastewater contained in the glass reactor, a wastewater sedimentation agent or a commercially available wastewater sedimentation agent according to the present invention was added in an amount as shown in Table 4 below. After 20 minutes of stirring the mixture, the treated wastewater was taken to measure the amount of precipitated slurry and the COD. The results are shown in Table 4.

폐수침강효과 비교Wastewater Sedimentation Effect Comparison 실시예 2의폐수침강제Wastewater Precipitator of Example 2 시판 폐수침강제FeCl3 Commercial Wastewater Precipitant FeCl 3 실시예 1의폐수침강제Wastewater Precipitator of Example 1 시판 폐수침강제Fe2(SO4)3 Commercial Wastewater Precipitant Fe 2 (SO 4 ) 3 침강제 농도()Sedimentant concentration () FeCl3를 기준으로하여 17.117.1 on the basis of FeCl 3 3838 Fe를 기준으로하여 66 on the basis of Fe Fe를 기준으로하여 1212 on the basis of Fe 첨가량(㎖)Addition amount (ml) 0.380.38 0.380.38 0.760.76 0.380.38 침전슬러리층(㎖)Sedimentation slurry layer (ml) 4040 5050 3030 5252 COD 제거율COD removal rate 6565 5959 7979 7070

상기 표 4의 결과로부터 알 수 있는 바와 같이, 본 발명에 따른 폐수침강제를 유기물 폐수의 처리에 사용하면 시판되는 폐수침강제에 비해 가라앉는 슬러리층의 부피는 적으면서도 COD 제거율은 보다 우수하였다. 따라서, 본 발명에 따른 폐수침강제가 사용이 간편하면서도 우수한 폐수정화 효능을 발휘함을 확인하였다.As can be seen from the results of Table 4, when the wastewater settling agent according to the present invention is used for the treatment of organic wastewater, the volume of the sink layer which is sinking is smaller than that of commercial wastewater settling agents, and COD removal rate is better. Therefore, it was confirmed that the wastewater sedimentation agent according to the present invention is easy to use and exhibits excellent wastewater purification efficacy.

Claims (6)

보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 폐기물 적색오니를 산으로 처리하여 제조됨을 특징으로 하는 폐수침강제.A wastewater precipitant, characterized in that it is produced by treating waste red sludge generated in a Bayer process for extracting aluminum hydroxide from bauxite with acid. 제1항에 있어서, 산이 염산 또는 황산인 폐수침강제.The wastewater precipitation agent according to claim 1, wherein the acid is hydrochloric acid or sulfuric acid. 제2항에 있어서, 염산을 사용하여 제조되며 주성분으로서 AlCl3, FeCl3및 CaCl2을 함유하는 폐수침강제.The wastewater precipitation agent according to claim 2, which is prepared using hydrochloric acid and contains AlCl 3 , FeCl 3 and CaCl 2 as main components. 제2항에 있어서, 황산을 사용하여 제조되며 주성분으로서 Al2(SO4)3및 Fe2(SO4)3 을 함유하는 폐수침강제.The compound according to claim 2, which is prepared using sulfuric acid and contains Al as a main component.2(SO4)3And Fe2(SO4)3 Wastewater sedimentation agent containing. 보오크사이트로부터 수산화알루미늄을 추출하기 위한 바이엘 공정에서 발생되는 폐기물 적색오니를 산을 이용하여 처리함을 특징으로 하는 폐기물 처리방법.Waste treatment method characterized in that the waste sludge generated in the Bayer process for extracting aluminum hydroxide from the bauxite using an acid. 제5항에 있어서, 산이 염산 또는 황산인 처리방법.The method of claim 5, wherein the acid is hydrochloric acid or sulfuric acid.
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CN103031443A (en) * 2012-12-26 2013-04-10 贵州大学 Method of dealkalizing red mud and recovering aluminum and iron
CN107879367A (en) * 2017-11-16 2018-04-06 湖南绿脉环保科技有限公司 A kind of red mud Comprehensive utilization method

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US4017425A (en) * 1972-11-10 1977-04-12 Shiao Shing Jen Method of activation of red mud
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US4017425A (en) * 1972-11-10 1977-04-12 Shiao Shing Jen Method of activation of red mud
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CN103031443A (en) * 2012-12-26 2013-04-10 贵州大学 Method of dealkalizing red mud and recovering aluminum and iron
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