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公开(公告)号：KR1020060133830A
公开(公告)日：2006-12-27
申请号：KR1020050053687
申请日：2005-06-21
Applicant: 한국과학기술연구원
Inventor： 이화영
IPC: B22F9/24
Abstract: A means capable of accomplishing high reduction ratio in a neutral or weak acidic pH range and in a relatively low temperature range without using an excessive quantity of a reducing agent when preparing nanosilver powder by a chemical precipitation method, and a method for effectively producing an uniform-sized nanosilver powder at very inexpensive cost are provided. In a method for preparing nanosilver powder from a silver-containing aqueous solution by a reduction precipitation method, the method comprises the step of injecting sulfur dioxide gas into the aqueous solution and adding a reducing agent to the mixed solution to obtain uniform nanosilver powder. The sulfur dioxide gas is injected into the aqueous solution at an injection amount ranging from 600 to 3,000 ml per 1 liter of the aqueous solution. The aqueous solution contains a silver concentration of 2 to 30 g/L. The mixed solution is reacted in a temperature range from room temperature to 70 deg.C. The silver-containing aqueous solution comprises silver nitrate. The silver-containing aqueous solution comprises polyvinylpyrrolidone as a dispersant. The reducing agent is formaldehyde. The method further comprises the step of filtering a generated silver precipitate, repeatedly cleaning the filtered silver precipitate with alcohol or distilled water, and drying the cleaned silver precipitate.
Abstract translation: 一种能够通过化学沉淀法制备纳米银粉末时，能够在中性或弱酸性pH范围内和相对低的温度范围内实现高还原率而不使用过量的还原剂的方法，以及有效地制备均匀的方法 提供非常便宜的成本的纳米银粉末。 在通过还原沉淀法从含银水溶液制备纳米银粉末的方法中，该方法包括将二氧化硫气体注入水溶液中并向该混合溶液中加入还原剂以获得均匀的纳米银粉末。 将二氧化硫气体以每1升水溶液600-3000ml的注射量注入水溶液中。 水溶液的银浓度为2〜30g / L。 混合溶液在室温至70℃的温度范围内反应。 含银水溶液包含硝酸银。 含银水溶液包含作为分散剂的聚乙烯吡咯烷酮。 还原剂是甲醛。 该方法还包括过滤生成的银沉淀物，用醇或蒸馏水反复清洗过滤的银沉淀物并干燥经清洁的银沉淀物的步骤。
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公开(公告)号：KR1020060132076A
公开(公告)日：2006-12-21
申请号：KR1020050052185
申请日：2005-06-17
Applicant: 한국과학기술연구원
Inventor： 이화영
IPC: B22F9/24
Abstract: A means capable of accomplishing a high reduction ratio of 92% or more at low temperature without using an excessive amount of the reducing agent or without heating the aqueous solution to a high temperature of 156 deg.C when preparing nanosilver powder from a silver nitrate(AgNO3) aqueous solution using dimethylformamide as a reducing agent by chemical precipitation method is provided. In manufacture of a nanosilver powder from a silver nitrate aqueous solution by a chemical precipitation method, a method of preparing nanosilver powder with uniform particle size comprises performing a reduction reaction of the mixture by adding dimethylformamide as a reducing agent to the mixture in the state that tetrahydrofuran as a dispersant and a reduction aid is added to the silver nitrate aqueous solution in advance. The tetrahydrofuran is added such that a mole ratio of silver to tetrahydrofuran becomes 1:1 to 1:3. The aqueous solution contains a silver concentration of 1 to 50 g/L, and the reaction is performed at a temperature of room temperature to 50 deg.C. The dimethylformamide that is a reducing agent is added such that a mole ratio of silver to dimethylformamide becomes 1:0.6 to 1:0.8.
Abstract translation: 能够在不使用过量的还原剂的情况下在低温下实现92％以上的高还原率，或者当从硝酸银制备纳米银粉末时不将该水溶液加热至156℃的高温的手段 AgNO 3）水溶液，使用二甲基甲酰胺作为还原剂，通过化学沉淀法提供。 在通过化学沉淀法从硝酸银水溶液制造纳米银粉末时，制备具有均匀粒度的纳米银粉末的方法包括通过在混合物中加入作为还原剂的二甲基甲酰胺在混合物中进行还原反应， 预先将作为分散剂的四氢呋喃和还原助剂加入到硝酸银水溶液中。 加入四氢呋喃，使得银与四氢呋喃的摩尔比为1:1至1:3。 水溶液的银浓度为1〜50g / L，反应在室温〜50℃的温度下进行。 添加作为还原剂的二甲基甲酰胺，使得银与二甲基甲酰胺的摩尔比为1:0.6〜1:0.8。
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公开(公告)号：KR1020040087440A
公开(公告)日：2004-10-14
申请号：KR1020030021840
申请日：2003-04-08
Applicant: 한국과학기술연구원
Abstract: PURPOSE: A method is provided to separate hexavalent chromium from electroplating wastewater containing heavy metals including iron, zinc, copper, nickel and chromium by adsorption method using strong base anion exchange resin as an adsorbent is provided. CONSTITUTION: The method comprises a step of adsorbing hexavalent chromium by adding SA10AP resin that is strong base anion exchange resin as an adsorbent to the electroplating wastewater; and a step of desorbing hexavalent chromium adsorbed onto the resin by adding sodium hydroxide and sodium chloride to the hexavalent chromium adsorbed resin, wherein 15 g/L to 25 g/L of the adsorbent is added to the strong base anion exchange resin, wherein the sodium hydroxide has concentration of 1 to 3 moles, wherein a weight ratio (NaCl/NaOH) of sodium chloride to sodium hydroxide is 6 to 8, wherein the adsorption step and the desorption step are respectively performed at temperature of 20 to 30 deg.C, wherein the adsorption step and the desorption step are respectively performed at stirring rate of 100 to 300 rpm, and wherein the adsorption step and the desorption step are respectively performed for 50 to 70 minutes.
Abstract translation: 目的：提供一种通过使用强碱阴离子交换树脂作为吸附剂的吸附方法将六价铬与含铁，锌，铜，镍和铬等重金属的电镀废水分离的方法。 构成：该方法包括通过将作为吸附剂的强碱阴离子交换树脂的SA10AP树脂加入到电镀废水中来吸附六价铬的步骤; 以及通过向六价铬吸附树脂中加入氢氧化钠和氯化钠将六价铬吸附到树脂上的步骤，其中将15g / L至25g / L的吸附剂加入到强碱性阴离子交换树脂中，其中 氢氧化钠的浓度为1〜3摩尔，其中氯化钠与氢氧化钠的重量比（NaCl / NaOH）为6〜8，其中吸附步骤和解吸步骤分别在20〜30℃的温度下进行 其中吸附步骤和解吸步骤分别以100至300rpm的搅拌速度进行，其中吸附步骤和解吸步骤分别进行50至70分钟。
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公开(公告)号：KR100436528B1
公开(公告)日：2004-06-22
申请号：KR1020020009828
申请日：2002-02-25
Applicant: 한국과학기술연구원
IPC: C22B11/00
Abstract: PURPOSE: A method for recovering gold and silver from acidic thiourea aqueous solution using iron powder is provided to environment friendly and efficiently recover and separate gold and silver from the acidic thiourea aqueous solution containing gold, silver and other trace of impurities by using iron powder as precipitant. CONSTITUTION: The method for recovering gold and silver from acidic thiourea aqueous solution using iron powder comprises the steps of adding iron powder as precipitant to the acidic thiourea aqueous solution as injecting nitrogen gas into an acidic thiourea aqueous solution in which gold ore is leached; and selectively precipitating gold and silver in the acidic thiourea aqueous solution by stirring the acidic thiourea aqueous solution as continuously injecting the nitrogen gas into the acidic thiourea aqueous solution, wherein the nitrogen gas is injected into the acidic thiourea aqueous solution at a flux of 200 to 400 mL/min, wherein size of the iron powder corresponds to a sieve size of 100 to 200 meshes, and the iron powder is added to the acidic thiourea aqueous solution in an amount of 3 to 5 g/L, wherein temperature of the precipitation is maintained to 20 to 30 deg.C, wherein speed of the stirring is maintained to 200 to 300 rpm, and wherein time of the precipitation is maintained to 30 to 40 minutes.
Abstract translation: 目的：提供一种使用铁粉从酸性硫脲水溶液中回收金和银的方法，该方法环境友好并且通过使用铁粉从包含金，银和其他微量杂质的酸性硫脲水溶液中有效回收和分离金和银 沉淀。 构成：使用铁粉从酸性硫脲水溶液中回收金和银的方法包括以下步骤：向酸性硫脲水溶液中加入铁粉作为沉淀剂，向注入金矿石的酸性硫脲水溶液中注入氮气; 通过搅拌酸性硫脲水溶液并连续地将氮气注入酸性硫脲水溶液中，在酸性硫脲水溶液中选择性沉淀金和银，其中氮气以200〜 400毫升/分钟，其中铁粉的尺寸对应于100-200目的筛尺寸，铁粉以3至5克/升的量添加至酸性硫脲水溶液中，其中沉淀温度 保持在20至30℃，其中搅拌速度保持在200至300rpm，并且其中沉淀时间保持在30至40分钟。
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公开(公告)号：KR100420927B1
公开(公告)日：2004-03-02
申请号：KR1020010089287
申请日：2001-12-31
Applicant: 한국과학기술연구원
IPC: C02F1/28
Abstract: PURPOSE: Provided are an adsorbent with great adsorbent efficiency for removing ammonia nitrogen in wastewater and a method for manufacturing the same. CONSTITUTION: The adsorbent comprises activated carbon powder, organic binder and organic acid and may further comprises alumina powder and/or silica powder. The method comprises the steps of (a) surface processing of adsorbent raw material powder such as activated carbon powder, alumina powder and silica powder using organic binder and organic acid, thereby forming granular type adsorbent, and (b) drying and heating the granular type adsorbent.
Abstract translation: 目的：提供一种用于去除废水中氨氮的吸附剂效率高的吸附剂及其制造方法。 组成：吸附剂包含活性炭粉末，有机粘合剂和有机酸，并且还可以包含氧化铝粉末和/或二氧化硅粉末。 该方法包括以下步骤：（a）使用有机粘合剂和有机酸对吸附剂原料粉末如活性炭粉末，氧化铝粉末和二氧化硅粉末进行表面处理，从而形成粒状吸附剂，和（b）干燥和加热粒状型 吸附剂。
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Patent Agency Ranking
公开(公告)号：KR100415984B1
公开(公告)日：2004-01-24
申请号：KR1020010020925
申请日：2001-04-18
Applicant: 한국과학기술연구원
IPC: B23K35/22
Abstract: PURPOSE: A preparing method of an iron thermit welding material with mill scale is provided to solve demerits of an existing thermit welding material preparation method accompanying oxidation or hydrogen reduction process and remilling process, that is, process complexity and high process cost. CONSTITUTION: The preparing method of an iron thermit welding material with mill scale comprises the steps of controlling particle sizes by classifying raw materials of mill scale and aluminum powder and trace additives of metal iron, ferro-manganese and silicon carbide in preparing the iron thermit welding material; and mixing the raw materials of aluminum powder and mill scale, and controlling an addition amount of the trace additives to have a proper mole ratio of aluminum powder to oxygen in mill scale, wherein a particle size of mill scale in the particle control step corresponds to a sieve size of 14 to 100 meshes, a particle size of aluminum powder in the particle control step corresponds to a sieve size of 30 to 100 meshes, a particle size of metal iron and ferro-manganese in the particle control step corresponds to a sieve size of 14 meshes or more, a particle size of silicon carbide corresponds to a sieve size of 30 to 50 meshes, a mole ratio (MAl/MO) of aluminum powder to oxygen in mill scale is 0.6 to 0.7, the addition amount of metal iron is 4 to 6 wt.% of the total amount of the welding material, the addition amount of ferro-manganese is 2 to 3 wt.% of the total amount of the welding material, the addition amount of silicon carbide is 1.4 to 1.6 wt.% of the total amount of the welding material, and the preparation method further comprises pretreatment step of roasting the mill scale at a temperature of about 400 deg.C to remove oil or contaminants.
Abstract translation: 目的：提供一种具有氧化铁皮的铁铝合金焊接材料的制备方法，以解决现有的氧化或氢气还原工艺和再生工艺中的铝合金焊接材料制备方法的缺点，即工艺复杂，工艺成本高。 本发明涉及一种铁鳞铝铁热轧焊接材料的制备方法，该方法包括以下步骤：在制备铁铝热焊接过程中，通过对铁鳞，铝粉的原料和金属铁，铁锰和碳化硅的微量添加剂进行分级来控制粒度 材料; 并将铝粉和氧化铁皮的原料进行混合，并控制微量添加剂的添加量，使其具有适当的氧化铝粉与氧气的摩尔比，其中，颗粒控制步骤中的氧化皮的颗粒尺寸对应于 筛孔尺寸为14〜100目，粒子控制工序中的铝粉粒径相当于筛孔尺寸为30〜100目，粒子控制工序中的金属铁和铁锰的粒径相当于筛子 尺寸为14目或更大，碳化硅的粒径对应于30至50目的筛尺寸，铝粉与氧气的摩尔比（MAl / MO）以磨机规格为0.6至0.7，金属的添加量 铁为焊接材料总量的4〜6重量％，铁锰的添加量为焊接材料总量的2〜3重量％，碳化硅的添加量为1.4〜1.6 焊接总量的重量百分比 材料，所述制备方法还包括在约400℃的温度下焙烧所述氧化皮以除去油或污染物的预处理步骤。
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公开(公告)号：KR1020030093654A
公开(公告)日：2003-12-11
申请号：KR1020020031387
申请日：2002-06-04
Applicant: 한국과학기술연구원
CPC classification number: C07C51/235 , B01J27/188 , B01J37/031 , B01J38/68 , C07C51/252 , Y02P20/584 , C07C57/04
Abstract: PURPOSE: A preparation method of heteropoly acid catalyst useful in preparing methacrylic acid by gas phase oxidation of methacrolein is provided, and a method for preparing methacrylic acid using catalyst prepared by the method is provided. CONSTITUTION: The preparation method of heteropoly acid catalyst comprises the steps of recrystallizing the dissolved solution using reduced pressure or vacuum drying by dissolving heteropoly acid, heteropoly acid salt or a mixture thereof into a basic organic solvent; and heat treating the recrystallized material, wherein the heteropoly acid is one or more acids selected from 12-molybdophosphoric acid (H3PMo12O40), 12-tungstophosphoric acid (H3PW12O40), 12-silicotungstic acid (H4SiW12O40), 12-molybdotungstophosphoric acid (H3PMo12-xWxO40, x=0 to 12), 12-molybdovanadophosphoric acid (H3+xPMo12-xVxO40, x=0 to 12), 18-molybdovanadophosphoric acid (H6+xP2Mo18-xVxO62, x=0 to 18), and 18-tungsto niobium phosphoric acid (H6+xP2W18-xNbxO62, x=0 to 18), wherein a part or all of hydrogen ions of heteropoly acid in the heteropoly acid salt is substituted by one or more metallic atoms selected from groups 1A to 7A, groups 1B to 5B and group 8B on the periodic table, and wherein the basic solvent is one or more solvents selected from aniline, dimethylformamide, quinoline, tetrahydrofuran, dimethylacetamide, pyridine, dimethylsulfoxide, ethylamine, N-methylpyrrolidone and butylamine.
Abstract translation: 目的：提供可用于通过甲基丙烯醛气相氧化制备甲基丙烯酸的杂多酸催化剂的制备方法，并提供使用该方法制备的催化剂制备甲基丙烯酸的方法。 构成：杂多酸催化剂的制备方法包括将杂多酸，杂多酸盐或其混合物溶解在碱性有机溶剂中，通过减压或真空干燥使溶解溶液重结晶的步骤; 并且对所述重结晶材料进行热处理，其中所述杂多酸是选自12-钼磷酸（H3PMo12O40），12-钨磷酸（H3PW12O40），12-硅钨酸（H4SiW12O40），12-钼钨磷酸（H3PMo12-xWxO40）中的一种或多种酸 ，x = 0〜12），12-钼钒酸磷酸（H3 + xPMo12-xVxO40，x = 0〜12），18-钼钒钒酸（H6 + xP2Mo18-xVxO62，x = 0〜18）和18-钨铌磷 酸（H6 + xP2W18-xNbxO62，x = 0〜18），其中杂多酸盐中的杂多酸的氢离子的一部分或全部被一个或多个选自1A〜7A组，1B〜5B组的金属原子取代 和基团8B，其中碱性溶剂是选自苯胺，二甲基甲酰胺，喹啉，四氢呋喃，二甲基乙酰胺，吡啶，二甲基亚砜，乙胺，N-甲基吡咯烷酮和丁胺中的一种或多种溶剂。
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公开(公告)号：KR100406983B1
公开(公告)日：2003-11-28
申请号：KR1020010002251
申请日：2001-01-15
Applicant: 한국과학기술연구원
IPC: B03B7/00
CPC classification number: Y02P10/234
Abstract: PURPOSE: A method for removing iron of clay mineral using biochemistry leaching is provided to prevent the leaching of aluminum during the iron removal process of clay mineral using an organic acid, and to reduce the usage of water. CONSTITUTION: The method for removing iron of clay mineral using biochemistry leaching consists of a step for preparing a mineral solution containing raw mineral to be processed; and a step for processing the mineral solution by adding metallic chloride reduction bacilli, and iron ion adsorbent. In the biochemistry leaching process using microorganisms, shewanella putrefaciens IR-1 is used.
Abstract translation: 目的：提供一种利用生化浸出除去粘土矿物的铁的方法，以防止在使用有机酸去除粘土矿物的铁的过程中铝的浸出，并减少水的使用。 组成：使用生物化学浸出法去除粘土矿物中的铁的方法包括制备含有待处理的未加工矿物的矿物溶液的步骤; 以及通过加入金属氯化物还原杆菌和铁离子吸附剂处理矿物溶液的步骤。 在使用微生物的生物化学浸出过程中，使用腐败沙门氏菌IR-1。
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公开(公告)号：KR1020020061287A
公开(公告)日：2002-07-24
申请号：KR1020010002251
申请日：2001-01-15
Applicant: 한국과학기술연구원
IPC: B03B7/00
CPC classification number: Y02P10/234
Abstract: PURPOSE: A method for removing iron of clay mineral using biochemistry leaching is provided to prevent the leaching of aluminum during the iron removal process of clay mineral using an organic acid, and to reduce the usage of water. CONSTITUTION: The method for removing iron of clay mineral using biochemistry leaching consists of a step for preparing a mineral solution containing raw mineral to be processed; and a step for processing the mineral solution by adding metallic chloride reduction bacilli, and iron ion adsorbent. In the biochemistry leaching process using microorganisms, shewanella putrefaciens IR-1 is used.
Abstract translation: 目的：提供使用生物化学浸出法去除粘土矿物铁的方法，以防止在使用有机酸的粘土矿物除铁过程中铝的浸出，并减少水的使用。 构成：使用生物浸出法去除粘土矿物铁的方法包括制备含有待处理的原料矿物的矿物溶液的步骤; 以及通过添加金属氯化物还原杆菌和铁离子吸附剂来加工矿物溶液的步骤。 在使用微生物的生化浸出过程中，使用了腐败芽孢杆菌IR-1。
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公开(公告)号：KR100206685B1
公开(公告)日：1999-07-01
申请号：KR1019970027619
申请日：1997-06-26
Applicant: 한국과학기술연구원
Abstract: 본 발명은 비소 오염 토양 및 폐기물을 가성소다 수용액을 사용하여 비소 성분을 용출한 다음, 여기에 염화칼슘을 첨가하여 수용액 중의 비소를 칼슘 비소 화합물로 침전시키는 것을 포함하는 비소 오염 토양 및 폐기물로부터 비소를 제거하는 방법에 관한 것이다.
본 발명의 방법을 이용하여 비소 오염 토양 및 폐기물을 처리하는 경우, 초기 함량 기준으로 95 % 이하의 비소를 용출시킬 수 있는 동시에, 수용액 중의 아세네이트를 최대 99.8 % 이하로 제거할 수 있게 된다.
또한, 본 발명의 방법으로 비소 오염 토양 및 폐기물을 처리하는 경우, 종래의 방법에 의한 경우에 비하여 처리 비용을 획기적으로 절감시킬 수 있다는 장점과 함께, 비소 성분을 안전하고 거의 완전히 제거할 수 있게 됨으로써, 비소에 의한 환경 오염을 방지할 수 있게 된다.
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