The Mining and Materials Processing Institute of Japan最新文献

{"title":"Corrosion Resistance of Steels in Sulfuric Acid Solution.","authors":"R. Matsuhashi","doi":"10.2473/SHIGENTOSOZAI.113.799","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.799","url":null,"abstract":"Sulfuric acid solution is the most common environment in various industrial processes and it is well known that the ion affect on the rate of corrosion of steels. In this paper, corrosion resistance of mild steels, low alloy steels, stainless steels and Ni-base alloys in such environment, are reviewed based on various studies. Types of stainless steels are developed for the environment and the evaluation of these steels is reported for both laboratory scale and field tests.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"39 1","pages":"799-804"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80612496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depressing Effect of Raising Pulp Temperature on Pyrite Flotation.","authors":"Hideyo Osanai, I. Matsuoka","doi":"10.2473/SHIGENTOSOZAI.113.571","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.571","url":null,"abstract":"The depressing effect of raising pulp temperature on pyrite flotation have been investigated by using diethyl dithiophosphate (ethyl aerofloat, E. A. F.) as a collector. The mechanism of depression have been studied in terms of collector adsorption and changes in concentration of sulfate, hydroxide and iron ions in pulp during conditioning, and the surface products after conditioning identified by diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and X-ray photo-electron spectroscopy (XPS).The results obtained are as follows:The flotation recovery of pyrite at pH 6 was only slightly decreased by raising pulp temperature from25°C to °C in the presence of large amounts of collector, but it was significantly depressed in moderate collector addition of the order of 200-300 g/t.There was no difference between collector adsorption at 25 °C and that at 60°C in the collector addition less than 500 g/t. Accordingly, the depression of pyrite by raising pulp temperature can not be explained by the decrease of collector adsorption.From the changes of the concentration of sulfate, hydroxide and iron ions before and after conditioning at 25°C or 60°C, it was suggested that basic iron sulfate was precipitated on pyrite surface during conditioning at either pulp temperature, but the amount precipitated at 60 t was much larger than that at 25°C, because the oxidation reaction of pyrite surface took place at 60°.The existence of sulfate on the pyrite surface after conditioning at 60 t was detected by DRIFTS and XPS.From the above experimental results, it is concluded that pyrite depression by raising pulp temperature is mainly attributed to the formation of hydrophilic basic iron sulfate which offsets the hydrophobization effect with collector adsorption.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"114 1","pages":"571-575"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78967959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recycling. Extraction and Recovery Techniques. Solvent Extraction.","authors":"Mikiya Tanaka","doi":"10.2473/SHIGENTOSOZAI.113.940","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.940","url":null,"abstract":"","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"68 1","pages":"940-944"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79054912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Electrolytes on Solidification of Glass Beads by Hydrothermal Hot-Pressing.","authors":"S. Kimura, Shinobu Fujisaku, N. Tsuchiya, K. Nakatsuka","doi":"10.2473/SHIGENTOSOZAI.113.67","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.67","url":null,"abstract":"Soda lime glass beads were solidified by hydrothermal hot-pressing at 300°C for a period of 1 hour with NaOH, KOH, NaCl, KCl, Na2SO4, HCl solutions and deionized water, respectively. Shrinkage was monitored during experiment, and the solidified products were examined by SEM-EDX, XRD, FT-IR, TG and Shore hardness tester. The cross-section of the reacted glass bead showed three distinct layers of varying thickness that have undergone different degrees of alteration. The degree of alteration was higher approaching the surface of the glass beads. The surfaces of the glass beads were highly altered, deformed and cemented with each other. The final shrinkage increased in the order of acidic, neutral and alkali solution. The Shore hardness was found to increase with any increase in shrinkage for solutions containing same cation but was higher for Na+ solution than K+ solution. Thermogravimetric results indicated that the water contents in solidified products with K+ solutions were higher than the ones with Na+ solutions. This suggests that the drop in the hardness was caused by the presence of larger amount of water in solidified products with K+ than Na+.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"1244 1","pages":"67-71"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76814294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recycling. Extraction and Recovery Techniques. Electrolytic Processes.","authors":"Y. Umetsu","doi":"10.2473/SHIGENTOSOZAI.113.945","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.945","url":null,"abstract":"","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"26 5 1","pages":"945-947"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82703658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of the Conical-ended Borehole Technique for Rock Stress Measurement with a High Accuracy.","authors":"Y. Obara, K. Imai, N. Nakamura, K. Sugawara","doi":"10.2473/SHIGENTOSOZAI.113.825","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.825","url":null,"abstract":"Knowledge of the rock stress is one of keys to design and construct rock structures. Thein-situstresses, therefore, have to be accurately measured. Since rock stress measurement is generally time consuming task, the new technique development is being expected to determine the complete stress state from a measurement in a single borehole. Thus, the stress relief method should be improved to meet its demand.Many stress relief methods to determine the complete state of stress have been proposed and developed. Among these methods, the CSIRO hollow inclusion stress cell has been most popular in the world, since it enables us to accurately measurein-situstresses. The eight-elements strain gauge, the hemispherical shaped strain cell and the conical shaped strain cell have been used in Japan. In these three methods, the conical-ended borehole technique with sixteen-elements conical shaped strain cell has an advantage to reduce the time, effort and cost for a series of rock stress measurements, combining the compact overcoring, the diameter of which equals to that of the pilot borehole.In the present study, the conical shaped strain cell has been modified and refined to improve the accuracy in rock stress measurement, increasing the number of strain measured on the conical bottom surface of the borehole with a cross typed strain gauge. This paper, firstly, shows how the stress tensor can be determined from the strains on a conical bottom surface of a single borehole. Then the accuracy of the proposed method was compared with that of existing method to confirm that the proposed method gives us more accurate results. Secondly, based on an in-siturock stress measurement, this paper indicates that the proposed method can be more effectively used forin-siturock stress measurements than the existing one. Also, process simulation of the strains and stresses on the conical bottom surface during the stress relieving gave well consistent results with measured data, which indicates that the proposed method is quite reliable forin-siturock stress measurements.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"127 1","pages":"825-831"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77200752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Structure and Morphology of Kaolin Minerals on the Intercalation of Urea.","authors":"Kinue Tsunematsu, H. Tateyama, K. Kimura, O. Ishibashi","doi":"10.2473/SHIGENTOSOZAI.113.211","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.211","url":null,"abstract":"The effect of the structural properties of kaolin minerals on the intercalation process of urea was investigated using kaolinite and two kinds of halloysite. The results are summarized as follow.(1) The urea intercalated gradually and regularly into the interlayer site of kaolinite with plate morphology, but intercalated immediately and irregularly into that of halloysite with tubular and spherical morphologies.(2) The decomposition temperature of the urea intercalated into kaolin minerals were lower than that of pure urea. The difference between the decomposition of the urea intercalated and that of pure urea was examined by IR spectrum analysis. The asymmetric and symmetric ν(NH2) stretching frequencies at 3, 504cm-1 and 3, 389cm-1 correspond to NH2 groups interacting with the oxygens located on the basal tetrahedral layer. Intercalation of urea within the kaolin minerals structure increased the ν(CN) stretching frequency from 1, 468cm-1 for the urea to 1, 477cm-1 for intercalated molecules. These results indicate that the hydrogen bonding of urea molecules intercalated into the interlayer site of kaolin minerals are weak as compared with the hydrogen bonding of pure urea molecules.(3) The ν(CN) stretching frequency of two kinds of halloysite showed broader pattern compared with that of kaolinite, but the ν(NH2) bending frequency of halloysites shifted to higher frequency than that of kaolinite. These results show that the hydrogen bonding of urea intercalated into the interlayer site of halloysite is different from the that of kaolinite.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"11 1","pages":"211-215"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91070792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fundamental Study on Early Detection of Underground Mine Fire Using Smell Detectors. Characteristics of the smell generated from the heated combustible materials.","authors":"K. Ohga, Kiyoshi Higuchi, K. Mukai","doi":"10.2473/SHIGENTOSOZAI.113.683","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.683","url":null,"abstract":"coal mines, by using smell detectors in our laboratory. From the results of measurements, it is clear that there are significant differences between measured data from each different type of smell sensor for coal, rubber of belt conveyer, oil and wood.In order to discern the source of combustion gases, we developed and tested a distinction system using a neural network system. From the results of the tests, the neural network system enables the identification of the source of gases, whether it would be coal, wood, oil and rubber of belt conveyer.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"128 1","pages":"683-687"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73309583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Relationship Between the Shape of a Disced Core and Three-Dimensional in-Situ Stresses Estimated by a Tensile Principal Stress Analysis.","authors":"K. Matsuki, K. Hongo, K. Sakaguchi","doi":"10.2473/SHIGENTOSOZAI.113.317","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.317","url":null,"abstract":"Based upon the assumption that core discing results from tensile stresses within and below a core during boring, the direction of the principal tensile stress was analyzed in detail for the stress conditions where core discing is likely to occur to investigate the relationship between the shape of a disced core and in-situ stresses for the case of a long disced core. Main results obtained in this study are summarized as follows: 1) In the central parts of the end surfaces, a relatively flat plane is formed. The azimuth of the normal direction of the plane coincides with that of the minimum principal stress, ƒÐ3. The inclination, Om of the normal direction from the core axis is approximately one thirds of that,.753 of ƒÐ3. By using the two equations, (1) and (3), a method for estimating more accurate ƒÓ3 (•}23%) was proposed. 2) By combining the additional equation, (1) on the magnitudes of ƒÐ3, the mean stress, um and the stress in the direction of the core axis, aZ with the previously proposed equation, (2), which is the condition of core discing, two of the above stresses can be determined if Om is measured and if one of them is determined independently. For the vertical borehole, by assuming uz to be an overburden pressure, um and u3 can be determined from the two equations. 3) When the difference between the maximum principal stress, ƒÐ1 and the intermediate principal stress, σ2 is large enough, a saddle shaped disc is formed and the shape becomes more distinct with the difference.For","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"11 1","pages":"317-324"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77344297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Psychometrical Evaluation on Landscape of Mined-out Quarry Reclaimed by Revegetating.","authors":"N. Otsuka, Y. Sekimoto, Mitsugu Saito, Takeshi Kamata","doi":"10.2473/SHIGENTOSOZAI.113.543","DOIUrl":"https://doi.org/10.2473/SHIGENTOSOZAI.113.543","url":null,"abstract":"Landscape destruction caused by open-cut mining makes an impact on the environmental issue. Landscape evaluation of mined-out quarry becomes necessary from the view point of environmental protection. In this study, we investigated on landscape of mined-out quarry that was reclaimed by revegetating. Three kinds of revegetation, namely herbaceous planting, woody planting and herbaceous + woody planting, were simulated using a color image processing technology with a personal computer. Two psychometrical evaluation tests, rating-scale method and semantic differential method, were conducted using color photomontages as variable stimulus.In the quantitative analysis by a rating-scale method, it became clear for the landscape reclamation of mined-out quarry that herbaceous planting was better than woody planting when it was seen at a short distance, and woody planting was better than herbaceous planting when it was seen at a long distance. In the factor analysis by a semantic differential method, it became clear that beauty and texture of revegetation were important factors to estimate the landscape evaluation of mined-out quarry.","PeriodicalId":22754,"journal":{"name":"The Mining and Materials Processing Institute of Japan","volume":"3 1","pages":"543-547"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75587096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}