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公开(公告)号：KR100424353B1
公开(公告)日：2004-03-24
申请号：KR1020000058963
申请日：2000-10-06
Applicant: 한국과학기술연구원
IPC: C01G25/04
Abstract: PURPOSE: A preparation method of high purity zirconium oxychloride from zircon sand is provided to save production cost and prevent environmental pollution by melt decomposition using lime instead of NaOH in a conventional method. CONSTITUTION: The preparation method of zirconium oxychloride(ZrOCl2·8H2O) from zircon sand is as follows: mixing zircon sand, CaCO3 and CaCl2 to be a molar ratio, 3CaCO3/ZrSiO4 of 1.0-1.2, and CaCl2/3CaCO3 of 0.1-0.4, and reacting at 1100-1300deg.C for 1-2hrs. for melt decomposition of zircon sand; leaching sintered zircon sand(solid content:10%) containing a large quantity of CaZrO3 and Ca2SiO4 with 4-6vol.% of HCl at room temperature firstly, and leaching with 15-25vol.% of HCl at 80deg.C secondly to remove silica and trace of element; evaporating and concentrating an aqueous zirconium solution to form zirconium oxychloride crystals.
Abstract translation: 目的：提供一种由锆英砂制备高纯度氧氯化锆的方法，以节省生产成本，并通过常规方法使用石灰代替NaOH进行熔融分解来防止环境污染。 构成：锆英砂的氧氯化锆（ZrOCl 2·8H 2 O）的制备方法如下：将锆英砂，CaCO 3和CaCl 2以摩尔比计混合，3CaCO 3 / ZrSiO 4为1.0-1.2，和CaCl 2 / 3CaCO 3为0.1- 0.4，并在1100-1300℃反应1-2小时。 用于锆英砂的熔融分解; 首先在室温下浸出含有大量CaZrO3和Ca2SiO4的含有4-6体积％HCl的烧结锆砂（固体含量：10％），然后用80-25℃的15-25体积％HCl浸提，然后除去二氧化硅 和元素的痕迹; 蒸发并浓缩锆水溶液以形成氧氯化锆晶体。
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公开(公告)号：KR100337372B1
公开(公告)日：2002-05-22
申请号：KR1020000024456
申请日：2000-05-08
Applicant: 한국과학기술연구원
IPC: C01B21/06
Abstract: 본 발명은 화학 반응열을 화합물 합성에 이용하는 자전 고온 합성법 (SHS)에 의한 질화보론(boron nitride; BN) 분말을 제조하는 방법에 관한 것으로, 산화보론(B
2 O
3 ) 분말과, 반응 정량의 마그네슘(Mg)분말 및 희석제 분말을 혼합하는 단계와, 상기 혼합물을 자전 고온 합성 반응기 내부에 배치하고 상기 반응기 내부의 압력이 50 내지 80기압이 되도록 질소가스를 채운 상태에서 점화시켜 자전고온 합성반응을 일으키는 단계, 및 충분히 냉각한 후 반응기로부터 가스를 제거하고 반응생성물을 꺼내는 단계로 이루어진다. 본 발명에 의하면 고가의 보론 원소 대신 저렴한 산화보론(B
2 O
3 )을 사용함으로써 질화보론의 제조비용을 획기적으로 절감할 수 있다.-
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Patent Agency Ranking
公开(公告)号：KR1020010049338A
公开(公告)日：2001-06-15
申请号：KR1020000024456
申请日：2000-05-08
Applicant: 한국과학기술연구원
IPC: C01B21/06
CPC classification number: C01B21/064
Abstract: PURPOSE: A method for preparing boron nitride by using a self-propagating high-temperature synthesis is provided which simply prepares the boron nitride from relatively cheap boron oxide. CONSTITUTION: The method comprises steps of: (i) mixing boron oxide powder, a fixed quantity of magnesium powder and diluent powder; (ii) after putting the mixture in a self-propagating high-temperature synthesizing reactor and filling the reactor with nitrogen gas to make the pressure of the reactor become 50-80, igniting the reactor to cause a self-propagating high-temperature synthesizing reaction; and (iii) after cooling the reactor and removing the gas from the reactor, taking the reaction product out of the reactor.
Abstract translation: 目的：提供一种通过使用自传播的高温合成制备氮化硼的方法，其简单地从相对便宜的氧化硼制备氮化硼。 方法：该方法包括以下步骤：（i）混合氧化硼粉末，固定量的镁粉和稀释剂粉末; （ii）将混合物置于自蔓延高温合成反应器中并用氮气填充反应器使反应器的压力变为50-80，点燃反应器引起自蔓延的高温合成反应 ; 和（iii）冷却反应器并从反应器中除去气体后，将反应产物从反应器中取出。
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公开(公告)号：KR1020000073464A
公开(公告)日：2000-12-05
申请号：KR1019990016772
申请日：1999-05-11
Applicant: 한국과학기술연구원
CPC classification number: C01B32/921 , C01B32/914 , C01B35/02
Abstract: PURPOSE: Carbide or boride ceramic powder by using self-propagating high-temperature synthesis(SHS) is provided to solve an unfinished reaction problem of SHS by keeping high pressure with 5 to 15 atmospheric pressure inside a reactor to restrain the pressure increase generated during the reaction. CONSTITUTION: A manufacturing method of carbide or boride ceramic powder by using self-propagating high-temperature synthesis(SHS) comprises the steps of the followings. Metal powder of the size of -50 mesh(below 300μm) and carbide(C) or boride(B) powder of -100 mesh(below 150μm) are mixed. The mixture is arranged in the SHS and the air in a reactor is eliminated by repeating letting out inactive gas after filling water pressure in the reactor. Inactive gas is applied to be the inner pressure of 5-15 atmospheric pressure and ignited. A product is crushed after cooling the reactor. The inactive gas is argon and the mixing process is performed by dry ball milling using a zirconia ball. Magnesium or aluminum powder of -50 mesh(300μm) eliminates a first oxide starting raw material of the size of -60 mesh(below 270μm), a second raw material and generated oxygen.
Abstract translation: 目的：通过使用自蔓延高温合成（SHS）提供硬质合金或硼化物陶瓷粉末，以通过在反应器内保持5至15个大气压的高压以抑制在该反应器内产生的压力增加来解决SHS未完成的反应问题 反应。 构成：通过使用自蔓延高温合成（SHS）的碳化物或硼化物陶瓷粉末的制造方法包括以下步骤。 将大小为-50目（300μm以下）的金属粉末和-100目（150μm以下）的碳化物（C）或硼化物（B）粉末混合。 将混合物配置在SHS中，并且通过在反应器中填充水压之后重复放出惰性气体来消除反应器中的空气。 非活性气体被应用为5-15大气压的内部压力并被点燃。 冷却反应器后将产物压碎。 惰性气体是氩气，混合过程通过使用氧化锆球的干球磨进行。 -50目（300μm）的镁或铝粉末消除了尺寸为-60目（低于270μm）的第一氧化物起始原料，第二原料和产生的氧。
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公开(公告)号：KR1019910010057B1
公开(公告)日：1991-12-12
申请号：KR1019890009768
申请日：1989-07-10
Applicant: 한국과학기술연구원
IPC: C22B7/00
Abstract: The stainless-steel-washing waste solution of 15-20 wt.% nitric acid, 5-10 wt.% fluoric acid, 1-1.5 wt.% Cr, 0.5-1.0 wt.% Ni and 2.8-3.0 wt.% Fe is treated by step-extracting the organic phase of Cr and nitric and fluoric acid at the phase rate of A/O = 2-5 with organic solvent of 30-50 vol.% trioctylamine, 10 vol.% isodecanol and 40-60 vol.% kerosene from the waste soln., washing the organic phase with Na2CrO4 soln. at A/O = 1 to remove nitric and fluoric acid, getting Cr-concentrated water phase with NaCl soln. at A/O = 0.2, recovering Na2CrO4 4H2O from the water phase, recovering NiSO4 by the similar way.
Abstract translation: 15-20重量％硝酸，5-10重量％氟酸，1-1.5重量％Cr，0.5-1.0重量％Ni和2.8-3.0重量％Fe的不锈钢洗涤废液 通过以30-50体积％三辛胺，10体积％异癸醇和40-60体积％的有机溶剂以相分数为A / O = 2-5的阶段萃取Cr和硝酸和氟酸的有机相来处理 来自废溶胶的％煤油，用Na2CrO4溶液洗涤有机相。 在A / O = 1以除去硝酸和氟酸，用NaCl溶液获得Cr-浓缩水相。 在A / O = 0.2，从水相中回收Na 2 CrO 4·4H 2 O，通过类似的方法回收NiSO 4。
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