Raw material selectivity in Lower Paleolithic shaped stone ball production: experimental research

2022 ◽  
Vol 14 (1) ◽  
Author(s):  
Ella Assaf ◽  
Javier Baena Preysler
Keyword(s):  
Experimental Research ◽  
Raw Material ◽  
Lower Paleolithic

Low Grade of Kyanite Ore Beneficiation Experimental Research in Xingtai

2012 ◽  
Vol 602-604 ◽  
pp. 115-119
Author(s):  
Jin Xia Zhang ◽  
Qi Hui Dai ◽  
Li Nan Tian ◽  
Xing Guo Wang
Keyword(s):  
Chemical Composition ◽  
Magnetic Separation ◽  
Experimental Research ◽  
High Intensity ◽  
Raw Material ◽  
Low Grade ◽  
High Grade ◽  
Market Demand ◽  
Low Intensity ◽  
Mineral Constituent

As high-grade refractories raw material，kyanite is widely used and the market demand is increasingly greater. To identify the process mineralogical properties of kyanite from Heibei so as to provide a mineralogical basis for its chemical composition, mineral constituent，ores texture and structure and so on. The results show that: the kyanite Al2O3 21.50%, SiO2 52.87%, using high intensity magnetic separation-gravity separation-flotation folwsheet. Experiments show that, the grinding fineness of -200 mush 65%, with strong intensity magnetic separation, magnetic concentrate by shaking the low intensity magnetic separation，we can get magnetite, garnet, biotite and phlogopite four concentrates, strong magnetic ore tailings consolidated by a rocking bed mud thrown first, refined through flotation, won Kyanite concentrate grading about 56.11% at a recovery of 49.90%.

Experimental Research on Si-Mn Slag Cementitious Material

2013 ◽  
Vol 438-439 ◽  
pp. 98-101
Author(s):  
Xu Fang Zhang ◽  
Jun Yu Wu
Keyword(s):  
Experimental Research ◽  
Sodium Sulfate ◽  
Anhydrous Sodium Sulfate ◽  
Setting Time ◽  
Cementitious Material ◽  
Additive Effect ◽  
Raw Material

A Si-Mn Slag Cementitious Material was prepared by mixing Si-Mn slag, circulating fluidization bed slag as raw material. The results shows that circulating fluidization bed slag and Si-Mn slag has a preferably additive effect in a certain range by combination of lime, anhydrite and anhydrous sodium sulfate as activator, and the strength of samples reach the peak at circulating fluidization bed slag of 8%, Si-Mn slag of 70%, anhydrous sodium sulfate of 2%, anhydrite of 10%, lime of 10%. The strength, setting time and soundness were also tested and the results can meet most of the requirements of OPC standard (42.5) GB/T 175-2007.

Experimental Research on Strengthen Mechanism of NaOH on Light Wall Materials Prepared from Crushed Brick Powder

2012 ◽  
Vol 535-537 ◽  
pp. 1657-1660
Author(s):  
Xue Wang ◽  
Yuan Chen Guo
Keyword(s):  
Experimental Research ◽  
Foam Glass ◽  
Raw Material ◽  
Wall Material ◽  
Light Weight ◽  
Mechanism Analysis ◽  
Main Research ◽  
Brick Powder ◽  
Soda Content ◽  
Crushed Brick

Crushed brick light weight wall material, which was made of crushed brick as a main raw material and P•S cement as a cementious material. Crushed foam glass and some admixtures were added, is prepared under the ordinary temperature and pressure condition. The main research in this paper is if NaOH has good alkaline excitation on crushed brick light weight wall material through experimental research and mechanism analysis. Studies have shown that: (1) The main chemical composition of crushed brick powder are SiO2 and Al2O3, crushed brick powder have a certain activity.(2) NaOH releases the activity of the internal soluble SiO2 and Al2O3.(3) In this experiment system, when the caustic soda content is about 3%, there has been an obvious peak of compressive strength.

Interaction between Technological and Material Parameters during Densification of Selected Types of Herbaceous Biomass

2016 ◽  
Vol 832 ◽  
pp. 79-88
Author(s):  
Peter Križan ◽  
Miloš Matúš ◽  
Juraj Beniak ◽  
Michal Svátek
Keyword(s):  
Experimental Research ◽  
Point Of View ◽  
Raw Material ◽  
Material Structure ◽  
Compression Pressure ◽  
Material Particle ◽  
Herbaceous Biomass ◽  
Biomass Densification ◽  
Experimental Findings ◽  
The Impact

In this paper, we will present the research findings concerning relationships between technological and material variables (parameters) during densification of selected types of herbaceous biomass. In general during the biomass densification can be recognized various technological and also material variables which significantly influence the final solid biofuels quality. In case of herbaceous biomass densification there are some important differences with comparing the wooden biomass. These differences come from the material (herbaceous) composition and also from material structure and influencing also lonely treatment, densification and also the combustion of final briquettes from herbaceous biomass. The main goal of presented experimental research is to determine the relationship between compression pressure, compression temperature and raw material particle size. Experimental research described in this paper was realized by single-axis densification, which was represented by experimental pressing stand. The impact of investigated variables on the final briquettes density and briquettes dilatation was determined. Mutual interactions of these variables on final briquettes quality are showing the importance of mentioned variables during the densification process. The experimental findings presented here are significant from briquettes production point of view and also from densification machines engineering point of view.

scholarly journals NEW LOWER PALEOLITHIC LOCALITY SKHIDNYTSYA II IN NORTH-EASTERN PART OF BESKID MOUNTAINS (PRELIMINARY RESULTS OF RESEARCHES)

2018 ◽  
Vol 22 ◽  
pp. 223-235
Author(s):  
Mykola BANDRIVSKYI ◽  
Roman GNATYUK ◽  
Vadym STEPANCHUK
Keyword(s):  
Raw Materials ◽  
Volcanic Rocks ◽  
Raw Material ◽  
Lower Paleolithic ◽  
Stone Artifacts ◽  
Preliminary Results ◽  
Eastern Carpathians ◽  
North Eastern ◽  
New Location ◽  
North Eastern Part

The article presents preliminary results of research carried out in 2018 near Skhidnytsya (Eastern Carpathians), where series of Paleolithic stone artifacts was found in slope Holocene deposits. According to technical and morphological indicators, these materials can be defined as belonging to Lower Paleolithic. Finding of new location of materials with Lower Paleolithic features on the outskirts of Skhidnytsia, again actualize results of researches, carried out by O. Chernysh in the area of this village during late 1980s – early 1990s. Recently discovered location of stone artifacts Skhidnitsya II is interesting and potentially important for the study of series of issues related to research of possible ways of settling of ancient communities. Although examination of sites has just begun, the following conclusions can be made. Technical and typological features of collection of tools make it possible to determine preliminary Skhidnytsya II as belonging to group of pebble industries, which in the western part of Eastern Europe are now dated back to 0,4–1,2 million years ago. According to available mediated data, chronological position of Skhidnytsya II tends to the first half – lower limit of mentioned interval. Volcanic rock was a raw material for production of some artifacts.Their outcrops are probably located in the area of Vihorlat-Gutin volcanic strata. Detected evidences of remote transportation of raw materials clearly indicate potential importance of materials from Skhidnitsya II for discussion of the time and ways of penetration of the Lower Paleolithic population to the territory of Europe. Key words: Lower Paleolithic, stone artifacts, pebble industry, volcanic rocks.

scholarly journals СПОСІБ ОЧИСТКИ ПИТНОЇ ВОДИ ВІД НІТРАТ-ІОНІВ

2014 ◽  
pp. 91-95
Author(s):  
Н. Б. Сененко ◽  
Д. О. Стороженко ◽  
А. І. Сененко ◽  
П. В. Писаренко ◽  
Г. В. Степаненков
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Chemical Composition ◽  
Experimental Research ◽  
Drinking Water Quality ◽  
Raw Material ◽  
Nitrate Ions ◽  
Physical Chemical ◽  
Before And After ◽  
Sorption Characteristics

Визначений хімічний склад проби глинистої сиро-вини. Представлені результати експериментальнихдосліджень її сорбційних характеристик у повітря-но-сухому стані й термічно обробленої за різних ре-жимів відносно нітрат-іонів. Досліджені основніфізико-хімічні показники якості природної питноїводи до та після обробки обраним сорбентом; визна-чені його десорбційні характеристики. Виявлена мо-жливість зменшення концентрації нітрат-іонів уводі. Розроблені рекомендації з очищення природноїпитної води від нітрат-іонів. The chemical composition of the sample clay raw material is specified. The results of experimental research of sorption characteristics of clay raw material in the air - dry condition and thermally treated at different regimes concerning nitrate – ions are presented. The basic physical - chemical indices of natural drinking water quality are researched before and after treating by selected sorbent and desorption characteristics is defined. The possibility of reducing the concentration of nitrate - ions in water is shown up. The recommendations for purification of natural drinking water from nitrate – ions are developed.

Chemical and Mineralogical Composition Influence of Steelworks Dust on Agglomerate Quality

2017 ◽  
Vol 1143 ◽  
pp. 120-126
Author(s):  
Vasilica Viorica Corcoţoi Toniţă ◽  
Maria Vlad ◽  
Ilenuta Severin ◽  
Andrei Berbecaru
Keyword(s):  
Experimental Research ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Raw Material ◽  
Sintering Process ◽  
Mineralogical Analysis ◽  
Secondary Raw Material ◽  
Chemical And Mineralogical Composition

From making steel process result dust and slurry that can be used as a secondary raw material in the composition stack of ferrous materials for the sintering process. Together with other raw materials rich in Fe, SiO2, CaO, this waste can be significant on quality ferrous agglomerate due to the useful elements contained.The paper presents the results of chemical and mineralogical analysis of steelworks dust and experimental research with a view to introduce dust in the sintering process to increase the quality of agglomerate.

scholarly journals Lower paleolithic site Kremenac near the village Rujnik (Serbia)

Starinar ◽  
2011 ◽  
pp. 7-31 ◽  
Author(s):  
Josip Saric
Keyword(s):  
Raw Material ◽  
Paleolithic Site ◽  
Early Date ◽  
Lower Paleolithic ◽  
Stone Artifacts ◽  
Chipped Stone ◽  
The Village

The site Kremenac has been known for decades as a location where large quantity of raw material for production of the chipped stone artifacts had been found. Only the excavations in 1995 and 1996 defined to a certain extent the artifacts, which indicated by their morphology the Lower Paleolithic date of this site. Because of the impossibility to study for the time being the material from the excavations this work deals with the surface chance finds, which are typologically and even more morphologically distinctive and on the basis of which it is possible to indicate the exceptional early date and importance of this site.

scholarly journals Microwear analysis of small recycled flakes and recycling products from the Ein-Zippori site, Lower Galilee, Israel

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Richard W. Yerkes ◽  
Yoni Parush ◽  
Avi Gopher ◽  
Ran Barkai
Keyword(s):  
Bronze Age ◽  
Ad Hoc ◽  
Raw Material ◽  
Early Bronze Age ◽  
Lower Paleolithic ◽  
Microwear Analysis ◽  
Use Wear ◽  
Lithic Raw Material

A microwear analysis of recycled lithic artefacts from late Pottery Neolithic Wadi Rabah and Early Bronze Age layers at Ein-Zippori, Israel included cores-on-flakes (COFs) which are discarded blanks made into cores, and the flakes detached from them. COFs may have microwear traces that formed before they were recycled. The focus here is on how blanks removed from recycled COFs were used. Discarded flakes were not used as cores to produce small blanks at Ein-Zippori because lithic raw material was scarce, but were COFs recycled so that small tools could be produced for specific tasks? Visible wear traces were present on 19 of 44 blanks produced from COFs. Microwear traces were similar to use wear Lemorini et al. (2015) observed on much older Lower Paleolithic recycled flakes from Qesem Cave, Israel. Most flakes struck from COFs had been used to cut and scrape meat and fresh hide (42%, n=8), but four were used to work wood (21%) and four others were used to cut, scrape, or whittle bone and wood (21%), and two were used for butchering and wood working (11%). One flake only had generic weak microwear traces (5%). These were expedient flake tools, made and used in an ad hoc fashion. Specific blanks do not seem to have been used for distinct tasks.

Experimental Research on Durability of Fair-Faced Concrete

2012 ◽  
Vol 535-537 ◽  
pp. 1693-1696 ◽  
Author(s):  
Cheng Qiu Cai ◽  
Qing Song Guo ◽  
Xin Li
Keyword(s):  
Data Collection ◽  
Experimental Research ◽  
Constructional Material ◽  
Raw Material ◽  
Construction Technology ◽  
Data Collection And Analysis ◽  
Testing Data ◽  
Acting Process ◽  
The Difference ◽  
Selection Of

Fair-faced concrete is a neotype constructional material. It is exposed to the natural environment directly as decorative walls in the acting process, so the request of durability of the concrete is much higher. Through comparison testing, data collection and analysis, find out the difference of durability of fair-faced concrete in different proportioning. It has positive significance to the selection of raw material and construction technology.

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