[표제지 등]
summary
List of Table
List of Figure
List of Photograph
칼라
목차
제1장 서론 15
제1절 연구 개발의 현황과 목적 15
제2절 연구 개발의 범위 17
제2장 금속산화물 미분체의 제조에 관한 고찰 20
제1절 초미립 금속산화물 제조 20
제2절 연마제용 세륨산화물 제조 24
제3장 SiO₂초미립 금속산화물 제조 연구 43
제1절 개요 43
제2절 SiO₂초미립 금속산화물 제조[원문불량;p.53,59] 44
제3절 초미립 금속산화물(SiO₂) 표면 처리[원문불량;p.80] 65
제4장 고급연마제용 세륨산화물 제조 85
제1절 개요 85
제2절 황산화반응법에 의한 세륨수산화물의 분리회수 86
제3절 세륨수산화물로부터 연마제용 세륨산화물 제조 102
제5장 결론 117
REFERENCES 119
판권지 122
[title page etc.]
Contents
Chapter 1. Introduction 15
Section 1. Status and purpose of the research 15
Section 2. Content of the research 17
Chapter 2. Survey on preparation of metal oxide fine powder 20
Section 1. Preparation of ultrafine metal oxide 20
Section 2. Preparation of rare earth oxide 24
Chapter 3. Preparation of SiO₂ ultrafine metal oxide 43
Section 1. Overview 43
Section 2. Synthesis of SiO₂ ultrafine metal oxide[원문불량;p.53,59] 44
Section 3. Surface treatment of ultrafine metal powder[원문불량;p.80] 65
Chapter 4. Preparation of CeO₂ as polishing powder 85
Section 1. Overview 85
Section 2. Recovery of Ce hydroxide by sulfation process 86
Section 3. Preparation of CeO₂ from the cerium hydroxide 102
Chapter 5. Conclusions 117
References 119
copyright 122
Table 2.1. Fields of application on improvement of mechanical properties 22
Table 2.2. Fields of application improvement of rheological properties 23
Table 2.3. The composition of rare earth ores. 25
Table 2.4. Physical and chemical data of Chinese polishing powder 37
Table 2.5. Physical and chemical properties for the polishing powder of Davison Specialty Chemical Co. (Product Name : VITROX C). 39
Table 2.6. Physical and chemical properties for the polishing powder of Davison Specialty Chemical Co. (Product Name : RAREOX 14). 39
Table 2.7. Physical and chemical properties for the polishing powder of Davison Specialty Chemical Co. (Product Name : RAREOX 90). 40
Table 2.8. Physical and chemical properties for the polishing powder of Davison Specialty Chemical Co. (Product Name : X-OX). 40
Table 2.9. Physical and chemical properties for the polishing powder of Cercoa Co. (Product Name : Lensmax Z). 41
Table 2.10. Physical and chemical properties for the polishing powder of Cercoa Co. (Product Name : Lensmax R). 41
Table 3.1. Physical properties of Tetraethoxysilane(TEOS) 44
Table 3.2. Flame profile of feeding TEOS into reactor tube 62
Table 3.3. Temperature profile of differential feeding factors 62
Table 3.4. Estimated consumption of ultrafine powders(1991년 말) 67
Table 3.5. Estimated consumption of SAS in the Western Hemisphere for 1990[3-7] 68
Table 4.1. Chemical composition of bastnasite. 86
Table 4.2. Rare earth Compositions of H₂O leaching solution. 94
Table 4.3. The compositions of Ce(OH)₄. 97
Table 4.4. Chemical compositions of the washed cerium hydroxide (unit: wt%). 107
Table 4.5. Variation of chemical compositions of the cerium oxide according to heat treatment and acid washing(unit: wt%). 108
Table 4.6. The properties of commercial polishing powder samples used in the experiments. 114
Table 4.7. Weight(Weigt) loss of the glass specimen in the polishing test according to variation of heat treating temperature of the cerium polishing powder. 115
Table 4.8. Weight(Weigt) loss of the glass specimen in the polishing test according to variation of polishing speed (unit: mg). 116
Fig.3.1. Schematic diagram of experimental apparatus. 46
Fig.3.2. Schematic diagram of experimental apparatus. 49
Fig.3.3. Effect of reaction temperature on the particle size (Preheating temp. : 500℃, TEOS conc.: 1.96×10-5 mol/l, Gas flowrate : 4 l/min).(이미지참조) 51
Fig.3.4. Log-probability plots of powders with different reaction temperature. 52
Fig.3.5. Effect of reaction temperature on the specific surface area of silica powder. (Preheating temp. : 500℃, TEOS conc.: 1.96×10-5 mol/l, Gas flowrate : 4 l/min).(이미지참조) 54
Fig.3.6. Transmission electron microscopic images of SiO₂ powders.[원문불량;p.53] 55
Fig.3.7. Effect of TEOS concentration on the particle size (Reaction temp. : 950℃, Preheating temp. : 500℃, Gas flowrate : 4 l/min). 56
Fig.3.8. Effect of preheating temperature on the particle size (Reaction temp. : 950℃, TEOS conc. : 1.96×10-5 mol/l Gas flowrate : 4 l/min).(이미지참조) 58
Fig.3.9. Effect of residence time on the particle size (Reaction temp: 950℃, TEOS conc.: 1.96×10-5 mol/l, Preheating temp.: 500℃)(이미지참조). 59
Fig.3.10. Transmission electron microscopic images of SiO₂ powder.[원문불량;p.59] 61
Fig.3.2.1. Schematic diagram of experimental apparatus 63
Fig.3.11. Flowsheet of surface modification on fine silica 73
Fig.3.12. Hydrophobicity of ultrafine silica treated with silane 75
Fig.3.13. Hydrophobicity of ultrafine silica treated with silane 77
Fig.3.14. Hydrophobicity of ultrafine silica treated with stearic acid 79
Fig.3.15. IR absorption spectrum of ultrafine SiO₂ powders treated with different materials. 81
Fig.4.1. Flowsheet of preparation of CeO₂ from Bastnasite Concentrate 87
Fig.4.2. XRD peak of the bastnasite sample. 88
Fig.4.3. Schematic diagram of H₂O leaching and cerium recovery system of the sulfated Bastnasite. 91
Fig.4.4. XRD peak of the sulfated bastnasite. 96
Fig.4.5. XRD peak of the cerium hydroxide sample (Z04244). 96
Fig.4.6. Relationship between calcination temperature and yield of leaching. 97
Fig.4.7. Relationship between calcination time and yield of leaching. 98
Fig.4.8. Relationship between amount of H₂SO₄ and yield of leaching. 99
Fig.4.9. Relationship between amount of H₂O and yield of leaching. 100
Fig.4.10. Two types of processes for preparing CeO₂ from Ce(OH)₄. 103
Fig.4.11. Distribution of particle size of the cerium polishing powder 111
Photo 3.1. Photograph of SEM on untreated ultrafine SiO₂[원문불량;p.80] 82
Photo 3.2. Photograph of SEM on treated ultrafine SiO₂[원문불량;p.80] 82
Photo 3.3. Thixotropical photograph of treated ultrafine SiO₂ 84
Photo 4.1. Sulfation furnace of the bastnasite concentrate. 92
Photo 4.2. Leaching tank of the sulfated bastnasite. 92
Photo 4.3. Precipitation tank of the water leached bastnasite. 93
Photo 4.4. Reactor of the cerium hydroxide and filtration equipment. 93
Photo 4.5. Configurations of the bastnasite samples according to the processes (a) original sample, (b) after sulfation, (c) after water leaching, and (d) precipitations of cerium hydroxide. 95
Photo 4.6. Rotary kiln used for making cerium oxide polishing powder. 105
Photo 4.7. The cerium hydroxide powder sample. 106
Photo 4.8. The cerium oxide powder sample for polishing powder. 106
Photo 4.9. Shape of the Ce(OH)₄ particles by SEM. 110
Photo 4.10. Shape of the CeO₂ particles by SEM after heat treatment 110
Photo 4.11. Shape of the CeO₂ particles by SEM after acid washing. 111
Photo 4.12. The experimental equipment used in the polishing test 113
Photo 4.13. The glass specimen used in the polishing test. 113