scholarly journals Influencia mineragráfica en la recuperación de oro en los procesos metalúrgicos de la Minera Qero´s Gold de Paucartambo- Cusco

2020 ◽  
Vol 23 (46) ◽  
pp. 139-146
Author(s):  
Alvaro Fernando Soto Mayorga ◽  
Juan José Leguía Letellier ◽  
Julio Danilo Bustamante Jaen
Keyword(s):  
Mineral Base

Los estudios mineragráficos permitieron seleccionar el proceso metalúrgico más adecuado para una óptima recuperación de oro, cuya caracterización tanto microscópica y macroscópica, permitió experimentar pruebas metalúrgicas en moliendabilidad, cianuración en botellas, concentración centrífuga, flotación rougher. Como resultado de estas pruebas metalúrgicas en el mineral base permitió una recuperación del 94.48% en flotación selectiva con una mezcla (blending) de 36% de veta Inkaracay y 64% de veta mina Sanca 2.

TRENDS IN MINERAL COMPLEX DEVELOPMENT AT THE TURN OF THE CENTUARY

2018 ◽  
pp. 3-15
Author(s):  
A. L. Dergachev ◽  
V. I. Starostin
Keyword(s):  
World Economy ◽  
Raw Materials ◽  
Supply And Demand ◽  
Mineral Resources ◽  
Strategy Of Development ◽  
Mineral Complex ◽  
Complex Development ◽  
Mineral Commodities ◽  
Working Out ◽  
Mineral Base

Important trends in development of world's mineral complex at the beginning of the 21st century are increase of supply and demand for mineral materials differentiated for various metals and nonmetallic mineral resources, regions and countries; concentration of production of mineral commodities in small number of countries; falling availability of economic reserves of raw materials for world economy even at current level of material extraction. The tendencies should be taken into account when working out strategy of development of Russian mineral base.

scholarly journals FERTILITY PROPERTIES AND LEAFY VEGETABLE PRODUCTION IN SOILS FERTILIZED WITH CATTLE MANURE

2017 ◽  
Vol 30 (4) ◽  
pp. 825-836 ◽  
Author(s):  
JOSÉ RICARDO MANTOVANI ◽  
MARCIZA CARRERA ◽  
JOHN LENNON ALVARENGA MOREIRA ◽  
DOUGLAS JOSÉ MARQUES ◽  
ADRIANO BORTOLOTTI DA SILVA
Keyword(s):  
Residual Effect ◽  
Clay Content ◽  
Cattle Manure ◽  
Leafy Vegetables ◽  
Growth And Yield ◽  
Vegetable Production ◽  
Organic Fertilization ◽  
Lettuce Seedling ◽  
Nutrient Contents ◽  
Mineral Base

ABSTRACT The effect of organic fertilization with cattle manure on fertility properties of soils with different clay contents was evaluated; as well as the influence of cattle manure fertilization on the production of lettuce, and on subsequent arugula and common chicory grown in these soils. The experiment with pot plants was arranged in randomized blocks and analyzed in a 3x6 factorial design with four replications. The treatments consisted of three soil types with different clay contents (166; 362; 565 g kg-1) and six cattle manure rates (0; 10; 20; 40; 80, and 160 t ha-1). Batches of each soil were manured, limed, filled in pots, moistened, and incubated for 30 days. Then, mineral base fertilization was applied and one lettuce seedling per each pot was grown. After lettuce harvest, the residual effect of organic fertilization was assessed in two subsequent crops, first arugula and then common chicory. The application of up to 160 t ha-1 cattle manure reduces soil acidity and increases nutrient contents, particularly of P, K and Zn, in soils with 165 to 565 g kg-1 clay content. Fertilization with cattle manure at rates of up to 160 t ha-1 increases electrical conductivity of soils, without affecting growth and yield of the leafy vegetables. Cattle manuring increases the yield of lettuce, as well as of arugula and common chicory grown afterwards.

scholarly journals A Clay-Based Geopolymer in Loess Soil Stabilization

2020 ◽  
Vol 10 (7) ◽  
pp. 2608 ◽  
Author(s):  
Nadav Hanegbi ◽  
Itzhak Katra
Keyword(s):  
Polyvinyl Acetate ◽  
Soil Stabilization ◽  
Dust Emission ◽  
Loess Soil ◽  
Dust Control ◽  
Natural Soil ◽  
Significant Interest ◽  
Global Land ◽  
Soil Destruction ◽  
Mineral Base

Soil erosion has environmental and socioeconomic significances. Loess soils cover about 10% of the global land area. Most of these soils are subjected to increased land uses such as unpaved roads, which increase soil destruction and dust emission to the atmosphere. There is a significant interest in applications for dust control and soil stabilization. Application of geopolymers may significantly reduce environmental impacts. This study examines the use of a metakaolin-based geopolymer for dust control and soil stabilization in a semi-arid loess soil. The application of the geopolymer for dust control in comparison with common products (brine, bitumen, polyvinyl acetate-PVA) resulted in no dust emission. As a soil stabilizer, the geopolymer tested in this study provides remarkably good results in the tensile test. The most successful composition of the geopolymer, which is activation solution of sodium silicate and sodium hydroxide (NaOH) together with an addition of 30% metakaolin, obtained soil strength of 23,900 N after 28 days. The attempt to replace NaOH with lime (CaO) in the activation solution was far inferior to the original composition. There is a strong potential to develop natural soil stabilizers from a mineral base that even surpass their capabilities over existing synthetic stabilizers.

scholarly journals The Synergistic Antiwear Performances of Organic Titanium Compounds Containing Sulfur with Borate Ester Additive

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xin Xu ◽  
Jian-Qiang Hu ◽  
Feng Xie ◽  
Li Guo ◽  
Jun Ma ◽  
...  
Keyword(s):  
Effective Interaction ◽  
Extreme Pressure ◽  
X Ray ◽  
Borate Ester ◽  
Load Carrying ◽  
Antiwear Properties ◽  
Chemical States ◽  
Titanium Compounds ◽  
Scanning Electron ◽  
Mineral Base

Two oil-soluble organic titanium compounds (OTCs) such as titanium dialkyldithiocarbamate (TiDDC) and sulfurized titanate (TiS) were synthesized and identified by Fourier-transform infrared spectroscopy (FTIR). The antiwear and extreme pressure properties of TiDDC or TiS with borate ester containing nitrogen (BNO) additive in mineral base oils were evaluated by four ball tester. The results show that TiDDC and TiS not only possess good antiwear and load-carrying properties, respectively, but also exhibit good antiwear synergism with BNO additive without impairing extreme pressure performances. Moreover, the synergistic antiwear properties of the said additives are improved significantly under the optimum additives ratios. The topography of wear scar and the composition and chemical states of typical elements on the rubbing surfaces were analyzed by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) and X-ray photoelectron spectrometer (XPS). The proposed synergistic antiwear mechanism involves an effective interaction between TiDDC or TiS and BNO additive, respectively.

EHD Film Thickness in Non-Steady State Contacts

1998 ◽  
Vol 120 (3) ◽  
pp. 442-452 ◽  
Author(s):  
J. Sugimura ◽  
W. R. Jones ◽  
H. A. Spikes
Keyword(s):  
Steady State ◽  
Film Thickness ◽  
Ultrathin Film ◽  
Contact Conditions ◽  
Steady State Motion ◽  
Base Oils ◽  
Different Types ◽  
Mineral Base

This paper describes a study of EHD film thickness in non-steady state contact conditions. A modification of ultrathin film interferometry is employed which is able to measure both central film thickness and film thickness profiles 50 times a second. Film thickness with two perfluoropolyethers and two mineral base oils are investigated in a number of different types of non-steady state motion, including acceleration/deceleration, stop/start and reciprocation. The results demonstrate a range of transient behaviors of EHD film whose thicknesses deviate from those in steady state conditions.

Tribological Investigation of Nanographite Platelets as Additive in Anti-Wear Lubricant: A Top-Down Approach

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Flavio A. C. Vidal ◽  
Antonio F. Ávila
Keyword(s):  
Friction Coefficient ◽  
Friction Reduction ◽  
Wear Properties ◽  
Top Down ◽  
Base Oil ◽  
Graphene Layers ◽  
Sliding Mechanism ◽  
Wear And Friction ◽  
Different Types ◽  
Mineral Base

A top-down approach is employed to investigate the tribological effect of adding nanographite platelets (NGPs) to mineral base oil (MBO). The performance of the NGP-modified MBO was evaluated by examining the friction and anti-wear properties. Four different types of NGPs produced by two different processes were employed. The optimal NGP-modified MBO attained a significant wear and friction reduction when compared with the MBO without NGPs. The process used to exfoliate the graphite nanoplatelet samples provided better wear properties because of the graphene layers' smoother sliding mechanism. Graphene layers seeped inside the groove marks to keep the friction coefficient low.

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