EFFECTIVE DEVELOPMENTAND UTILIZATION OF

NON-METALLIC MINERALSProceedings of the Second World Congress on

Non-metallic Minerals, October 17-21, 1989,Beijing, China

EDITED BYGu Jiexiang, Yuan Jizu, Chen Jichun

Volume I

UNlVEFv.srV: .-:•?.!-'iL'O i Hc.iv s

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ORGANIZED BY

Chinese Silicate Society (host)

Yugoslav Union of Engineers and Technicians,Miners, Geologists, and Metallurgists

United Nations Industrial Development Organization

Industrial Minerals, Part of Metal Bulletin Journals Ltdof London, U.K. and New York, USA

INTERNATIONAL ACADEMIC PUBLISHERS

CONTENTS

VOLUME I

GEOLOGY

Effect of Bentonite Application on the Soil Characteristics and Crop 3Productivity of Sandy Soils in Egypt

AbdEl-Naim.M,, R.M.El-Awady, K.S.El-Halawany (Egypt)

Investigation and Application of Wollastonite Fibre Reinforced Concrete 7Bi Xiaoping, Huang Zhongji, Zhou Zufu (China)

Utilization of Marl and Discussion on Its Exploration Index 11Dachen Cao (China)

The Mechanism of Expansion and Exfoliation of Vermiculite During 15Heating

Cao Junxing, Zhu Zizun, Wen Lu, et al. (China)

Development and Utilization of the Salem Limestone (Mississippian) 19from the Indiana Building-Stone District, U.S.A.

Donald D.Carr, William H.McDonald (USA)

Type-II Diamond Resources in the Southern Part of Liaoning 26Che Feng (China)

The Characteristics of Chemical Composition of the Blue Asbestos 30in China

Chen Shengping, Zhang Jianhong, Zhou Xunrou, et al. (China)

Essential Reactions and the Roles of Wollastonite and Diopside in 34Building Ceramic Biscuits

Dai Changlu, Zhang Zhenyu, Ye Danian (China)

Characteristics and Utilization of Anhydrite 38Ding Dawu (China)

Application of Bentonite in Animal Science 42Fang Dezhe, Yu Haetu (China)

Chalcedony Sands as Mineral Raw Material for Direct Water Glass 46Production

L. Filizova, M. Maleev, M. Marinov, et al. (Bulgaria)

Evaporite Deposits of Triassic Tethys in South China 49Gao Guangli (China)

On the Application of Xingan Shale 53Gao Liankuei (China)

The Discovery and Study of Fluorbritholtte-(Ce) 56Gu Jiexiang, Tang Suren (China); G.Y.Chao (Canada) et al.

Diatomite Exploration in the Main Ethiopian Rift 59Million Hailemichael (Ethiopia)

A Study of the Thermal Phase Transformation of Boehmite and Its $3Fluorine-Reducing Capacity

Han Cheng, Bie Wanlin (China)

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Measurements of Crystallinity for Quartz and Its Geological Significance 67He Mingyue, Wang Pu, Chen Daizhang, et al. (China)

Constitution of Sri Lanka Clays and Their Behaviour Under Industrial 71Conditions

M.M.J.W. Herath (Sri Lanka)

China's Nepheline Syenites and the Methods of Evaluation 76Huang Qiang, He Shaoneng, Han Jialing (China)

Geology of Primary China Clay Deposits, Southwest England 80Norman J.Jackson, D.A.Knox (U.K.)

A Method of Calculating the Phase Contents and Phase Chemical Compositions 84in Natural and Artificial Rocks

Ke Zuokai, Su Liangho (China)

Mineralogy and Genesis of Kaolin Deposits in Hadong-Sancheong Area, 87Korea

Soo Jin Kim, Gi Young Jeong, Soo Jae Lee, et al. (Korea)

Clay and Phosphatic Minerals as the Products of Hydrothermal Circulation 93in the Ocean Crust

V.B.Kurnosov, O.V.Chudaev (USSR)

Nonmetallic Mineral Raw Materials in the 21st Century 96M. Kuzvart (Czech.)

Applied Investigation of Clinoptilolite and Mordenite in China 103• Li Bowei (China)

Techno-Economic Evaluation on the Resources and Deposits of Boron 107in the Southern Part of Northeast China

Li Dongming (China)

The Geochemical Character of Serpentinite and Its Utilization in Agriculture 111Li Heyu, Wan Pu, Jiao Chunchu, et al. (China)

The Research of the Development and Utilization of Jilin Province 115Bentonite

Li Yongxin, Cui Yingchun (China)

Present Research Situation on Talc Deposits in China 120Li Yuya (China)

Exploitation and Utilization of Sillimanite Mineral 124Lin Binyin, Liu Huizhen, Song Rubo, et al. (China)

China's Gemstone Resources and Geology 129Luo Yiqing (China)

Production and Application of Bentonite-Adsorbent 132Meng Zhong (China)

Complex Valorization of Aluminosilicate Ores in Yugoslavia 136Sinisa Milosevic; and Miroljub Marinko (Yug.)

Kaolin: A Versatile Industrial Mineral 142Haydn H.Murray, Jun Yuan (USA)

Celestite Deposits of the Qal, Eh Sardar Area 152Ahmad Nabian (Iran)

Depositional Facies Models for Upper Cretaceous Carbonates in the 156Benue Trough of Nigeria, a Mid-Mesozoic Aulacogen Structure

Michael N. Oti (Nigeria)

Structure Variations Accompaning Dehydroxylation Rehydroxylation 162of Serpentine

Ljubica Pavlovic and Milan Stamatovic (Yug.)

Ceramic Properties of a Kaolinitic Mudstone Deposit from Botswana 165Paul Ramonyane (Botswana)

A Study of the Mechanism of Dispersing and Pulping Properties of 173Chrysotile Asbestos

Peng Tongjiang, Wan Pu, Zhu Zizun (China)

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Thermal Transformation in 1:1 and 2:1 Clay Minerals. lilertron Optical !7<Studies

Helena de Souza Santos, Maria Cecilia Salvadori (Brazil)

Mineralogy and Genetic Classification of Natural Zeolites of Azerbaijan iK(Adil G. Seidov (USSR)

Transformation Stages of the Argillaceous Minerals in the Sedimentary 1K4Mantle of the Earth's Crust

Seidov A.G, Kotelnikov D.D. (USSR)

Technological Properties of Chrysotile Products 190Shao Guoyou (China)

The Study of Erosion Mechanism of the First Application of Magnesium-Carbon 194Bricks in the Steel Tub Linings in Wuhan Iron and Steel Company

Shen Shangyue, Su Lianghe, Weng Runsheng (China)

Exploitation and Study of Low Priced Abradant in Marble Polish 198Tang Suren (China)

Secondary Quartzi tes and the Formation of Kaolin, Pyrophytlite and 201Alunite Deposits of Tan Mai Region, Viet Nam

Tran Xuan Toan (Vietnam)

The Types of Chrysotile Asbestos Deposits of NW Part of China and 208Its Signification

Wan Pu (China)

Mineral Solid Electrolyte 212Wang Dazhi, Yuan Wangzhi, Zhu Bin, et al. (China)

The Mineralogical Study of Graphite in Nanshu, Shandong Province 215Wang Keqin (China)

On Minerogenetic Regularity and Geology of Porcelain Stone Deposits 219in North Gan-South Wan Area, China

Wang Ling, Li Chaoyi, Song Gongbao (China)

The Development and Utilization of China Da-Ding-Shan Wollastonite 223Minerals

Wang Xun (China)

Jade in China 226Wen Guang (China)

Investigating the Anhydrite Associated in an Iron Deposit for the Comprehensive 22^Utilization

Weng Hanyuan (China)

The Research on the Improvement of Colour of Natural Sapphire 232Wu Ruihua, Yan Xiaojiang, Hao Yaping (China)

The Study of Quantitative Analysis Method for Clay Minerals Using 234SEM/EDX

Xi Ketang, Gu Xianzhang (China)

Advances in Diatomite and Perlite Filter-Aid Research 238Xu Huizhen, Guo Zhongru (China)

Prospects of Developing Diatomite in China 24 1Yao Yijian (China)

The Geochemical Characteristics and Geneses of Yangxi Kaolin Deposit 245in Suzhou, China

Yi Facheng, Tien Xiu (China)

A New Type Carrier for the Combustion Catalyst — Natural Zeolite 249Xianxin Yuan, Xiaoming Zheng (China)

The Discovery of Matian Phosphate Mineral Deposit and Problem of 252Ore-Finding Again During Late Stage of Exploitation

Yue Song (China)

Researches of the Characteristics of Ore Deposit and Mineralogy and 255Ore Utilization of Rectori te in Zhongxiang, China

Zhao Lianqiang, Sun Xiaochenp, Zhang Rongying et al. (China)

259The Clay Mineral Deposits of China

Zheng Zhi, Zhang Renjun, Xu Jiquan et al. (China)•Jf.'X

Sapphire and Garnet in Jiangsu Province, ChinaZheng Zlli, Chen Changhu (China)

The Technical Properties of Bentonite Ore Indigenous to the Localityof Yang Sian and Xi Xiang and Its Utility as Coating Material forBuilding

Zhou Guohua, Chen Daizhong, Tang Zilin (China)

The Research on the Nature of the Artificially Modified Bentonite 2 7 0

Products and Their ApplicationsZhou Yunchen, Li Suzhang (China)

The Role of Polishing-Medium in the Process of Marble-Polishing 2 7 4

Zhuo Leyun, Li Shuqin, Gao Mlnghan, et al. (China)

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VOLUME H

MINING

Non Metallic Mineral Deposits of Nepal and Their Utilization 335R.P. Bashyal (Nepal)

Designing Ventillation Systems by Computer 33')Zoltan Buoczd, Janos Janositz (Hungary)

Influence of Inert Additives on the Detonation Properties of Commercial 342Explosives

Chen Baoxin, Fang Zefa, Jiang Jinjun (China)

Computer Overall Planning System for Open-Pit Operation 345Chen Huan, Ding Hui (China)

Database System Oriented Geostatistic Models (DSOMA) 349Cui Shuying, Zhai Dongsheng (China)

Caving Method and Surface Movement at Yangxi Kaolin Mine 352Fan Hanzhong, Zhu Xiukang (China)

Comprehensive Evaluation to Effects of the Mine Construction Investment 356with Fuzzy Theory

Feng Baocheng (China)

Modern ̂ Mineworking Solutions for Thick Coal/Mineral Deposits 359Kovacs Ferenc (Hungary)

Technological Innovations in the Exploitation of Fontane Talc Mine, 362Italy

Otello Del Greco, Mario Patrucco, Sebastiano Pelizza, et al.(Italy)

A New Technology of Strengthening Ore Draw in the Ore Pass 368Gu Desheng, Wu Aixiang (China)

Gypsum Mining Industry in China 373Huang Lisheng (China)

Demand and Supply Prospect of Major Non-Metallic Minerals in South 377Korea

Byung-Koo Hyun, Chung-In Lee, Kyung-Han Lee (Korea)

Complex Prevention Against Water in Coal Mines Endangered with 383Roof-Water Inrush

Jeney, Jambrik Rozalia (Hungary)

Discussion of Mechanism of Rock Breakage by Explosive in Terms 386of Stress Wave Theory

Jiang Jinjun, Liu Qingrong (China)

Research of Primary Rock Stress Distribution and Stability of Surrounding 389Rocks in Qingping Phosphorus Mine

Jiang Zengguo, Zhang Goulian, Zhu Yujie, et al. (China)

Mineralogical and Engineering Behaviour of Indian Bentonites 393Jaivant M. Kate (India)

The Present Condition and Strategy of China's Non-Metallic Mineral 399Industry

Li Baoyin (China)

Mining and Utilization of Glauberite 403Li Ying, Chen Guobing, Long Kailu (China)

The Study on Fast Expansive Cracking Agent 406Liang Kaishui, Wang Yujie (China)

A Study of Time-Dependent Behaviour of Rock Strength 409Liu Muyu (China)

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Controlled Blasting Research for Shapen Cutting of Structural Decoration .413Stone

Liu Qingrong, Zheng Changqing (China)Failure of Rock Mass by Underground Mining and Its Engineering Countermeasure 417

Liu Xiong, Lu Yehai (China)The Characteristics of Ground Pressure Occurrence and the Safe Distance 420for Mining a Multiple-Seam and Gentle Dip Gypsum Deposit in an AscendingOrder

Lu Wenxing, Lin Chaoe (China)An Approach to the Application of Concentration of Stress Control 423Blasting into Quarrying Dimension Stones

Luo Zuchun (China)Fracture Strength Testing of Non-Metallic Materials 428

Minh Phong Luong (France)Some Advances in Determination of Elastic Deformability of Rock 433Mass

Ma Guang, Fang Ligang (China)Italian Marble and Granite Industry: The Present Economical and Technological 437Status and the Current Trends

Mancini R., Badino G., Morandini A., et al. (Italy)Non-Metallic Minerals in India's Development 447

K.S. Murty (India)Norway: Small in Size - Large in Non-Metallic Minerals 452

Kai Nielsen (Norway)Non-Metallic Minerals in Finland 458

YrjoPekkala (Finland)Testing Rock Quality 463

John E. Prentice (U.K.)The Practice of Mining Methods at Yingcheng Gypsum Mine 473

Qiu Weiding (China)The Selection of Optimal Mine Site 477

Dehui Ren, Liao Wang (China)A Dynamic Programming Method for Determination of the Optimum 481Cutoff Grade for an Undergound Mine

Ren Yi (China); J.R. Sturgul (Australia)

A Program for Development of Phosphate Rock Deposits in the Asean 484Region

Suvit Sampattavanija (Thailand)

The Improvement on the Mining Method of Glaubejite Mines in Western 486Sichuan Plain Area —-"Hydro-Solution Method

Shi Zhongwu (China)

Production of Non-Metallic Materials in the USSR 490Vladimir Y.Sidorov, Victor P.Gelvanowski, Lev A. Puchkov (USSR)

The Calculation Methods of Required Air Quantity for a Drift-Shape 494Stope

Song Xueyi, Meng Tinrang, Wu Chat) (China)Industrial Clays of Brazil 497

Persio de Souza Santos (Brazil)Simulating Mining Conveyor Belt Systems 505

John R.Sturgul (Australia); Ren Yi (China)The Development Stages of Industrial Minerals Projects of the Peoples 509Democratic Republic of Ethiopia

Lakew Tezera (Ethiopia)

Limestone Application in Japan 516Masanobu Tokuda (Japan)

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The'Study of Rock Cutting Force by Fracture Mechanics 522Wang Chengyong, Liu Peide, Hu Rongsheng (China)

Computerized Simulation of Ore Drawing for Caving System* 526Wang Yongjia, Xing Jibo (China)

Determine Open Pit Slope by Fuzzy Mathematical Method 530Wu Hengjing (China)

3-D Ore Body Model and Its Applications 533G.H.Xiong, J.H.Zu (China)

A Study of Stability of Stope Pillar Under the Surface Structure in 537the Saudong Gypsum Mine

Xu Changyou, Lu Ning (China)

Converse Analysis of the Expansion Forces of Wall Rocks of Underground 542Construction

Xu Qingda (China)

The Comminuting Property of Rock Particle Bed and Work Indexes* 545Xu Xiaohe, Wang Shuxin, Hu Jingkun (China)

Non-Metal Mining in Japan 549Umetaro Yamaguchi (Japan)

Stability Analysis of the Barrier Pillar in the Mined-out Area and Some 555Questions About Stability of the Mined-out Area

Yen Xiande (China)

Principles of Pressure-Flask-Controlled Explosion 560Yao Keyin, Yang Xianyong (China)

An Expert System on Selection of Mining Methods 563Q.X.Yun, Y.F.Chen, Y.G.Zhang (China)

The Technical Problems of Open Stoping System in Mining the Orebody 567with Medium Thickness and Gentle Angle of Dip

Zhang Jianxun, Luo Xianbo (China)

The Statistic Analysis for Correlativity of Ground Pressure Accidents 570with Volcanos and Earthquakes

Zhang Jiaxiang (China)

Determine Criterions for the Caving Conditions of Block Caving 573Zhang Shixiong, Tong Guangxu (China)

Ground Pressure Control in Liuchong Phosphate Mine 575Zhang Xingren (China)

The Application of a New-Type Wallcaving System of Selective Mining 580with Filling to Flat Thin Mineral Deposits

Zhang Zhicheng, Zhou Juncai, Huan Bingdong (China)

The Solution Mining for Chemical Mines and Its Intensifying Process 584Zhang Zhisi (China)

Application of Computer Simulation and Prediction of Grey System 588in Limestone Mine

Zhang Zhongyuan, Xiao Yanping (China)

Computer Simulation of Ore Drawing of Caving System 592Zhao Qing He (China)

Numerical Simulation of Mining in Stratified Deposits 596Zheng Zedai (China)

A New Classification Method of Rock Blastability in China — The 60°Robust Fuzzy Dynamic Classification

Zhong Dongwang, Niu Qiang, et al. (China)

The Research of a New Mining Method of Inclind Medium Thickness 603Ore Body

Zhou Yi (China)

Theoretic Analysis and Computation on the Stress Field and Size Distribution 607of Fragments by Rock Blasting

Zhu Ruigeng, Wang Xuefeng (China)

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The Time-Space Effects of Excavation for Underground Chambers 611on Stability of Surrounding Rock Masses

Zhu Weishen, Wang Kejun, Zhan Caizhao (China)

Dynamic Photoelastic Investigation of the Action of Decouple 615Zhu Zhenhai, Qu Guangjian, Sun Qiang, et al. (China)

A Study of Photo-Image Analysis Method of Rock Fragmentation by 620Blasting

Zou Dingxiang, Zeng Shiqi, Guo Chuji (China)

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VOLUME BI

MINERAL PROCESSING AND UTILIZATION

Some Alternative Methods for Separating Silica from Calcite at Very 649Fine Sizes

F.C. Acquah (Ghana)

Soviet Experience in Waste Utilization in the Production of Non-Metallic 655Materials

Yuri A. Alekhin (USSR)

Beneficiation of Canadian Wollastonite Ores 657Paul R.A. Andrews (Canada)

Nonmetallic Minerals in Stained Glass Production 662M.K. Babayev, D.M. Ganbarov, A.G. Seidov (USSR)

A New Method for Cleaning of Magnesite Ores 665Bozidar Brankovic, Predrag Bulatovic (Yug.)

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Mineral Processing of Pegmatites as Feldspar Ore 6 6 9

Nizamettin Capkinoglu, Omer Aydan, Yalcin Kaytaz (Turkey)Computer Simulation of Closed Circuit Tests in Mineral Processing 675

Chen Jichun (China)The Study on Processing Mineralogy of Asbestos Dressing 679

Chen Ruyi (China)A Study on Treatment of the Waste Water from Collophanite Flotation 684with Biological Technique

Chen Zhong (China)

Adsorption-Desorption of Cationic Type Collector and Flotability 691of Celestite

E.Chibowski, L.holysz (Poland);F.Gonzalez-Caballero, M.A.Gabrerizo (Spain)

Technology for Aluminium Sulphate from Chamotte Production Waste 694Ch. Choparinov, M. Maleev, L. Filizova, et al. (Bulgaria)

To Obtain the Mordenite from the Volcanic Glasses 697Dadashev F.B., Ali-zade Kh. A., Seidov A.G., et al. (USSR)

The Improvement of Direct Flotation Process for Francolite Beneficiation 700Dai Congzhou, Yang Zhongwei (China)

Water Purification by Kaolinites from Vyagwa and Mvumvu 704Barandemaje Denis (Burundi)

White Bauxite in Refractory Industries 710Dusan Dragovic (Yug.)

Role of Bentonites in Environmental Engineering 715Zdenek A.Engelthaler, Petr Duchek (Czech.)

The Origin of Delazian Sulfur Mine and Method of Sulfur Processing 719in Ancient Iran

M.B.Farhadian, F.Vahdadi (Iran)Improvement of the Quality of Kaolins by Means of Microbial Treatment 722

S.N. Groudev, V.I. Groudeva, S.G. Buchvarov, et al. (Bulgaria)Comprehensive Utilization of Nonmetallic Tailings 727

He Guojin (China)The Exploitation and Production Technology of Forsterite Sand 731

He Jianhua, Su Yuying, Wang Qianwu (China)The Use of Dispersants in Kaolin Processing 735

Rolf Helfrlcht, Joachim Schatz (GDR)Study of Oxidation Bleaching of Suzhou Kaolin 741

Huang Mingli, Yu Yang, Peng Pu (China)Phosphate Upgrading by Calcination Method 744

I. Jallad, Issa Oweis (Jordan)A Study of Exploitation and Utilization of Maoming Wheathering Residual 753Kaolin Resource in China

Jin Zhenqing (China)Processing of Pollucite with Low Caesium Content to Caesium Compounds 758of High Purity

Jung.W., Hoffmann.A., May. P. (GDR)Complex Utilization of Some Bulgarian Clays for Production of Mineral 761Coagulants

Rumen D.Kanev, Deliana Chavdarova (Bulgaria)Biotechnological Utilization of Waste Phosphogypsum Up to Calcium 767Fertilizer and Elemental Sulphur

W. Kawacz, A. Szymaftski, W. Kowalski, et al. (Poland)Intensive Flotation Technology of Wide Size Range Boron Ore .771

S.B.Leonov, S.B.Polonsky (USSR)

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An Investigation on the Application of Sepiolite to the Manufacture 778of Covered Arc-Welding Electrodes

Li Fakai, Wen Huaming (China)

The Mixed Clay of the Kaolinite-Illite-Montmorillonite and Their Application 782in High Strength Electric Porcelain Manufacture

Li Shude (China)

Influence of Sodiumdihydrogen Phosphate on the Collecting Selectivity 786of Dodecylamineacetate for Magnesite and Dolomite

Li Xiaoan (China); D. Salatic (Yug.)

Multiorder Fuzzy Control Model and Synthetic Decision of Technological 790Process Forecast in a Mineral Processing Plant

Liu Xianmu (China)

The Practice of Recovering Non-Metallic Minerals from the Tailings 795of Tantalite — Columbite

Liu Yongzhi (China)

A Study of Filtration of Sticky Fine Mineral 7 9 9Lan Fang Ma, Ming Zhang (China)

Optimization of the Rock Product Systems by Use of Computer Simulation 803Jerzy Malewski (Poland)

Effect of Inorganic Electrolyte on Graphite Flotation 809Mao Jufan, Zhao Huiling (China)

Preliminary Work on Bentonite as a Binder Additive in the Briquetting 814of Ilmenite

Jader Martins (Brazil)

Special Treatment of Granite as Raw Material for Future Porcelain 816Development

Stefan Michafowski, Andrzej M.Szymahski (Poland)S. Andrew Zalewski (USA)

Technology of Coating Kaolin Production for Paper Industry 823I.Nishkov, R.Varbanov, M.Marinov (Bulgaria)

Development of High Alumina Refractories from Ghana Bauxite 827Chris O.Njoku, Frank Iloghalu (Nigeria)

Beneficiation of South-East Anatolian Calcareous Phosphates by Calcination 834Glilhan Ozbayoglu, Ali MUnur Boztepe (Turkey)

Positive — Reverse Flotation of Silica — Calcareous(/Magniferous) 837Phosphorite Ore

Peng Ru (China)

A Mathematical Model of Coal Drying by Saturated Steam 841Dragan Petkovic, Milan Stamatovic, Ljubica Andric (Yug.)

Effective Application of the Raw Material Basis and the Technology 844Method in the Inorganic Insulating Fibres Production

Iva Polaskova, Jifi Dokoupil (Czech.)

Magnesites in Yugoslavia 847Dusa.n Salatic (Yug.)

Further Development of Fluorite Flotation from Ores Containing Higher 853Calcite Contents With Oleoylsarcosine as Collector

H. Schubert, H. Baldauf, W. Kramer, et al. (GDR)

Study of Unfired Gypsum Tailing Brick 858Shen Wenhua, Fang Tingting, Xu Jiami (China)

Separation of Wollastonite from Calcite and Quajtz — A Study on 863Comprehensive Utilization of Low-Grade Wollastonite from Dadingshan

Shen Yuqing, Song Yewen (China)

Water Film Properties on Mineral Surfaces in Flotation Aspects 867Piotr Staszczuk (Poland)

The Study and Manufacture of Sepiolite Brake Friction Block 871Sun Qi, Tang Tiande, Lou Yunyu, et al. (China)

Removal Iron from A12O3 Powder by Vibro-High Gradient Magnetic 874Separation — A Study

Sun Zhongyuan, Li Zhengnan (China)

Thermal and Mechanical Activation as Alternative or Combinet Methods 876of Pre-Leach Treatment of Magnesite

Klara Tkacova, tudmila Turcaniova, Irena Hocmanova (Czech.)

Use of Colemanite in Acid Steelmaking Processes 880Yavuz A.Topkaya, Hakan Sarinalbant (Turkey)

The Application of Hydrothermal Quartz in the Production of Refractors 887Radoslav Vasiljevic, Ljubica Pavlovic, Petar Krstovic, et al.(Yug.)

The Research of Possible Barytes Production from the Secondary Mineral 891Raw Material as Represented by Tailings of Dressing Plants

Vidla/j., Rezek K., Bla'hova O. et al. (Czech.)

Microbial Deferrization of Quartz Sands 897Volsgen.F., Stb'rr.M., Kohler, M. (GDR)

The Function and Application of Non-Metal Mineral Drugs for Medical 900Care

Wan Deguang, Liu Xuesong, Xu Yang, et al. (China)

Optimal Design of a Spiral Concentrator: Model Development for Single 903Phase Flow

J.W.Wang (China); J.R.G.Andrews (Australia)

Superiority and Application of the High Efficiency Vibration Mill in 909the Deep Treatment of Non-Metallic Minerals

Wang Shulin (China)

The Mica Ceramic Attenuation Material and It's Application for High 913Power Microwave Devices

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A New Technique of Wet Classification and Fe2O3 Elimination of 941Quartz Sandstone

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Flotation Classification, Selection of Flotation Process and Separation 944Index of the Chinese Graphite Deposits

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A New Type of Asbestos Concentration Equipment — Inclined Vibrational 948Concentration Screen

Yuan Chuxiong (China)

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Study on Flotation and Chemical Bleach of Ouhai lllite Ore in China 952Yuan Jinfeng (China)

Studies on the Flotation Separation of Wollastonite from Calcite, 956Quartz and Feldspar

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Some New Opinions on Flake Graphite Processing 961Zeng Xianbin, Mi Guomin (China)

Diopsidite - An Ideal Raw Material for Fast Firing Glazed Tiles at 966Low Temperatures

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Magnesite Ore Dressing in China 970Zhang Wentao, Zhang Yimin, Zhang Kening (China)

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Study on Papermaking Coating Prepared from Palaeozoic Sedimentary 978Kaolin Rock of Xuzhou

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A Mineral Processing Technique for Mica Scrap from Linshou 981Zhu Yinbo, Guo Li (China)

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DBLAYBD PAPERS 1029

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