scholarly journals Utilization of slaked lime for the regulation of pH value in the process of copper

2009 ◽  
Vol 63 (1) ◽  
pp. 61-66
Author(s):  
Aleksandar Petkovic ◽  
Sonja Petkovic ◽  
Srdjana Magdalinovic
Keyword(s):  
Ball Mill ◽  
Ph Value ◽  
Gas Production ◽  
Flotation Process ◽  
Total Cost ◽  
Milk Glass ◽  
Slaked Lime ◽  
L Value ◽  
Flotation Concentration ◽  
Storage Place

The investigations of used lime at plant from company Messer-Tehnogas, Belgrade, were in the aim to improvement technologically results from flotation concentration of copper minerals in flotation plant Veliki Krivelj. This paper shows usage of slaked lime, which is waste in the process of technical gas production, for regulation of pH value in the process of copper minerals flotation concentration. It is important to point out that slaked lime is a waste material that is not dangerous. Preparation and dosage includes preparation procedures, which enable introduction into flotation process with the aim of achieving better results. Lime from Limekiln Zagradje is brought into four storage places in flotation. Volume of each storage place is 80 m3. Lime in pieces from storage place is added by airbladders on transportation line and by system of transportation lines lime gets to the ball mill. At the mill entrance water is added and then follows lime grinding. Milk glass of lime thus prepared goes to the pump basket from where is transported by pipeline to conditioner, and then by manual and (or) automatic valves it is dosed to the flotation concentration of copper minerals process. Prospect of advancement and rationalization of the used lime in flotation plant Bor, Veliki Krivelj and Majdanpek as well as a way to link different branches of industry was demonstrated. Total cost of lime supplying, transporting, preparation and distribution related slaked lime is lower for 2.955 din/kg. Particularly, using lime from Messer in content of 2.1 g/l value of pH 11.82 is possible to obtain.

scholarly journals Pengendalian Persediaan Untuk Mengurangi Biaya Total Persediaan Dengan Pendekatan Metode Periodic Review (R,s,S) Power Approximation Pada Suku Cadang Consumable (Studi Kasus : Job Pertamina Talisman Jambi Merang)

2017 ◽  
Vol 4 (1) ◽  
pp. 8
Author(s):  
Adhi Putra Mahardika ◽  
Muhammad Nashir Ardiansyah ◽  
Efrata Denny S. Yunus
Keyword(s):  
Service Level ◽  
Spare Parts ◽  
Gas Production ◽  
Inventory Level ◽  
Periodic Review ◽  
Inventory Cost ◽  
Turbine Engine ◽  
Total Cost ◽  
Gas Processing ◽  
Power Approximation

Spare parts is one of the production support components which plays an important role for the survival<br />of gas production in the gas processing facility owned by SKN JOB Pertamina Talisman Jambi Merang. The<br />high inventory level increased the high inventory cost for the industry which get the benefit from the efficiency<br />of processes and resources. This research involved consumable spare parts for Solar Turbine engine as much<br />as 25 SKUs with demand character patterned lumpy demand and Poisson distribution. The implementation<br />of policies using Periodic Review (R, s, S) with Power Approximation approach in the inventory system<br />capable to generate a lower total cost inventory by pressing the backorder volume, the booking volume and the<br />inventory levels in a balanced manner. Calculation of Periodic Review (R, s, S) with Power Approximation<br />approach resulted inventory parameter which was able to press the total cost of inventory at 8.54% lower and<br />increase the service level by 1.11%.

Preparation of Ni-Coated SiC Ceramic Composite Powder by Electroless Plating

2011 ◽  
Vol 117-119 ◽  
pp. 77-80
Author(s):  
Huai Yao ◽  
Guang Lin Zhu ◽  
Yong Zhi Wang
Keyword(s):  
Electroless Plating ◽  
Ph Value ◽  
Nickel Chloride ◽  
Gas Production ◽  
Basic Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deep Blue ◽  
Reaction Theory ◽  
Diffraction Patterns

As a surface technology, electroless plating is applied to almost every industry branch. To improve the wettability of SiC powder and metal, the surface of SiC powders was plated with a Ni plating in the basic solution according to the reaction theory of electroless plating. The main salting was nickel chloride, and the reducing agent was hydrazine hydrate. The plating velocity, phase transformation and microstructurewere investigated using XRD and SEM. The results show that the SiC powders had no increasing weight and no reaction can occur when the pH below 8.5. when the pH value was between 10 and 11, the weight gain of powders closed to the theoretical value, the Ni peaks in X-ray diffraction patterns of powders was relatively strong, the SiC coating surface was composed of granular, cellular and globe-like Ni, the substrate was covered of Ni plating completely. When the pH value was above 11, the gas production was becoming more pronounced and the reaction speed increasing with the increased of the pH value, the time from deep blue to colorless of solution started to drop off, the Ni(OH)2peaks in X-ray diffraction patterns of powders have already begun to emerged and a small amount of nickel films was generated.

scholarly journals Extraction of Phosphorous from a Phosphorous-Containing Vanadium Titano-Magnetite Tailings by Direct Flotation

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 874 ◽  
Author(s):  
Junhui Xiao ◽  
Chao Chen ◽  
Wei Ding ◽  
Yang Peng ◽  
Tao Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Paraffin Wax ◽  
Low Grade ◽  
X Ray Diffraction ◽  
Flotation Process ◽  
X Ray ◽  
Pine Oil ◽  
Flotation Concentration ◽  
Scanning Electron

In this study, there is 1.42% P2O5 in the P-containing V-Ti magnetite tailings in Miyi Region of China, with the valuable minerals mainly including apatite, and aluminosilicate minerals as the main gangue components. The direction flotation process was used to recover phosphorous from the low-grade phosphorous-bearing V-Ti magnetite tailings. The results showed that an optimized phosphorous concentrate with a P2O5 grade of 31.35% and P2O5 recovery of 88.02% was obtained by flotation process of one roughing, three scavengings, and three cleanings under roughing conditions, which employed pulp pH of 9, grinding fineness of <0.039 mm occupying 90%, flotation concentration of 25%, and dosages of carboxymethylcellulose, oxidized paraffin wax soap, and pine oil of 400 g/t, 300 g/t, and 20 g/t, respectively. Optimized one scavenging, two scavenging, and three scavenging conditions used a pulp pH of 9, and dosages of carboxymethylcellulose, oxidized paraffin wax soap, and pine oil of 200 g/t, 150 g/t, 10 g/t; 100 g/t, 75 g/t, and 5 g/t; and 100 g/t, 75 g/t, and 5 g/t, respectively. Optimized one cleaning, two cleaning, and three cleaning condition dosages of carboxymethylcellulose of 100 g/t, 50 g/t, and 25 g/t, respectively. Study of analysis and characterization of phosphorous concentrate by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) show that most gangue minerals enter the flotation tailings, the main minerals in phosphorous concentrate are apatite, olivine, and feldspar.

scholarly journals Recovering Cobalt and Sulfur in Low Grade Cobalt-Bearing V–Ti Magnetite Tailings Using Flotation Process

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 536 ◽  
Author(s):  
Xiao ◽  
Zhang
Keyword(s):  
Copper Sulfate ◽  
Metal Sulfide ◽  
Raw Material ◽  
Low Grade ◽  
Sulfur Recovery ◽  
Butyl Xanthate ◽  
Flotation Process ◽  
Pine Oil ◽  
Cobalt Recovery ◽  
Flotation Concentration

There is 0.032% cobalt and 0.56% sulfur in the cobalt-bearing V–Ti tailings in the Panxi Region, with the metal sulfide minerals mainly including FeS2, Fe1−xS, Co3S4, and (Fe,Co)S2, and the gangue minerals mainly including aluminosilicate minerals. The flotation process was used to recover cobalt and sulfur in the cobalt-bearing V–Ti tailings. The results showed that an optimized cobalt–sulfur concentrate with a cobalt grade of 2.08%, sulfur content of 36.12%, sulfur recovery of 85.79%, and cobalt recovery and 84.77% were obtained by flotation process of one roughing, three sweeping, and three cleaning under roughing conditions, which employed pulp pH of 8, grinding fineness of < 0.074 mm occupying 80%, flotation concentration of 30%, and dosages of butyl xanthate, copper sulfate, and pine oil of 100 g/t, 30 g/t, and 20 g/t, respectively. Optimized one sweeping, two sweeping, and three sweeping conditions used a pulp pH of 9, and dosages of butyl xanthate, copper sulfate, and pine oil of 50 g/t, 15 g/t, 10 g/t; 25 g/t, 7.5 g/t, 5 g/t; 20 g/t, 5 g/t, 5 g/t, respectively. Optimized one cleaning, two cleaning, and three cleaning condition dosages of sodium silicate of 200 g/t, 100 g/t, 50 g/t, respectively. Study of analysis and characterization of cobalt–sulfur concentrate by X-ray diffraction (XRD), automatic mineral analyzer (MLA), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) showed that the main minerals in cobalt–sulfur concentrate are FeS2, Co3S4 and (Fe,Co)S2, of which FeS2 and (Fe,Co)S2 accounted for 65.64% and Co3S4 for 22.64%. Gangue minerals accounted for 11.72%. The element Co in (Fe,Co)S2 is closely related to pyrite in the form of isomorphism, and the flotability difference between cobalt and pyrite is very small, which makes it difficult to separate cobalt and sulfur. Cobalt–sulfur concentrate can be used as raw material for further separation of cobalt and sulfur in smelting by pyrometallurgical or hydrometallurgical methods.

scholarly journals Effect of Sodium Lauryl Sulfate-Fumaric Acid Coupled Addition on theIn VitroRumen Fermentation with Special Regard to Methanogenesis

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
M. A. Abdl-Rahman ◽  
F. A. R. Sawiress ◽  
A. M. Abd El-Aty
Keyword(s):  
Fumaric Acid ◽  
Sodium Lauryl Sulfate ◽  
Volatile Fatty Acids ◽  
Ph Value ◽  
Rumen Fluid ◽  
Negative Control ◽  
Gas Production ◽  
Lauryl Sulfate ◽  
Decremental Effect

The aim of the current study was to evaluate the effect of sodium lauryl sulfate-fumaric acid coupled addition onin vitromethangenesis and rumen fermentation. Evaluation was carried out usingin vitrogas production technique. Ruminal contents were collected from five steers immediately after slaughtering and used for preparation of inoculums of mixed rumen microorganisms. Rumen fluid was then mixed with the basal diet of steers and used to generate four treatments, negative control (no additives), sodium lauryl sulfate (SLS) treated, fumaric acid treated, and SLS-fumaric acid coupled addition treated. The results revealed that, relative to control, efficiency in reduction of methanogenesis was as follows: coupled addition > SLS-addition > fumaric acid addition. Both SLS-addition and SLS-fumaric acid coupled addition demonstrated a decremental effect on ammonia nitrogen (–), total short chain volatile fatty acids (SCVFAs) concentrations and the amount of substrate degraded, and an increment effect on microbial mass and microbial yield (). Nevertheless, fumaric acid did not alter any of the previously mentioned parameters but induced a decremental effect on –. Furthermore, both fumaric acid and SLS-fumaric acid coupled addition increased propionate at the expense of acetate and butyrate, while, defaunation increased acetate at the expense of propionate and butyrate. The pH value was decreased by all treatments relative to control, while, cellulase activity did not differ by different treatments. The current study can be promising strategies for suppressing ruminal methane emissions and improving ruminants feed efficiency.

Preparation of Nano-Particles of Metal Oxides via a Novel Solid-Liquid Mechanochemical Reaction Technology

2007 ◽  
Vol 26-28 ◽  
pp. 671-674 ◽  
Author(s):  
Ding Chen ◽  
Song Ni ◽  
Geng Li Chen ◽  
Zhen Hua Chen
Keyword(s):  
Metal Oxides ◽  
Ball Mill ◽  
Reaction Rate ◽  
Ph Value ◽  
Nano Particles ◽  
Metal Particles ◽  
Mechanochemical Reaction ◽  
Metal Powders ◽  
The Mean ◽  
Solid Liquid

Nano-particles of metal oxides Mn3O4, Cu2O, Fe3O4, the mixture of Zn(OH)2 and ZnO have been successfully prepared via a novel solid-liquid mechanochemical reaction technology. The metal powders are ground in water solutions using planetary ball mill. The solid-liquid reactions can occur on the surface of the powders and the reacted layer can be continuously peeled off during milling. The mean sizes of the as-prepared particles are approximately 20~100nm.The formation of nano-particles is attributed to the reactions between particles and solution as well as the repeated and quick peeling of the formed oxides on the surface of metal particles. Furthermore, the reaction rate and phase types of the products can be controlled by adjusting the pH value of the solution.

Recovery of Silver from Zinc Acid-Leaching Residue by Flotation

2013 ◽  
Vol 392 ◽  
pp. 14-23
Author(s):  
Zhi Chao Yang ◽  
Ying Yong Ge ◽  
Yuan Long Zhang ◽  
Jun Li Zhao ◽  
Kun Zhu
Keyword(s):  
Ph Value ◽  
Influence Factors ◽  
Acid Leaching ◽  
Orthogonal Test ◽  
Pulp Density ◽  
Considerable Influence ◽  
Sodium Sulphide ◽  
Flotation Process ◽  
Flotation Recovery ◽  
Leaching Residue

Through flotation recovery of Silver (Ag) from Zinc acid-leaching residue (ZALR) was investigated in this study. The study adopted the single factor and orthogonal test reveal interactions among all considerable influence factors including sodium sulphide (SS) as regulator, ammonium butyl dithiophosphate (ABD) as major collector, GC as minor collector, interaction between ABD and GC, OC as flotation carrier, and pulp density. The experimental results show the flotation of the circuit composited of one rougher, one cleaner, one scavenger and middlings being back to the next rough flotation together is practical way and that the concentrate containing Ag 10890.0g/t, recovery77.43% can be obtained from the residue (Ag grade 340g/t). The optimum roughing flotation process is: the pH value of flotation pulp is 3.0~4.0, the pulp density is about 45wt.%, ABD dosage is 900g/t, GC dosage is 50g/t, OC dosage is 2000g/t, and BK201 dosage is 100g/t.

Evaluation of a fat protection method (Ca-soap) with an in vitro gas production system

2006 ◽  
Vol 34 ◽  
pp. 125-129
Author(s):  
H Magaña-Sevilla ◽  
CA Sandoval-Castro ◽  
C. Capetillo-Leal
Keyword(s):  
Soybean Lecithin ◽  
Control Diet ◽  
Gas Production ◽  
Dietary Fats ◽  
Pennisetum Purpureum ◽  
Protection Method ◽  
Slaked Lime ◽  
Lime Solution ◽  
Sorghum Grain

SummaryAn in vitro gas production technique was used to evaluate a fat protection method (Ca-soap). The Ca-soaps were prepared by incorporation of oil into a slaked lime solution which had been prepared immediately before. The proportions employed were 10:1 (oil:slaked lime). A feed sample of 0.5g was incubated in a N-rich medium, using 6 ml ruminal liquor and 54 ml medium. A factorial design 2x3 (2 inoculum sources from cows fed with and without Ca-soap x 3 diets) was employed. Diets were A) Control: 70% grass (Pennisetum purpureum var. Taiwan), 30% sorghum grain; B) Soybean lecithin: 70% grass, 20% sorghum, 10% Lecithin; and, C) Ca-soap: 70% grass, 20% sorghum 10% Ca-soap (made from lecithin). Total gas production, DM and OM in vitro digestibility were measured. A 10% reduction (approximately) (P<0.05) on IVDMD and IVOMD with the oil diet was found, but no differences were found (P>0.05) between Control and Ca-soap diets. No effect was found due to inoculum source (P>0.05). Compared with the Control diet, the total gas production was reduced (P<0.05) in the oil diet and was intermediate in Ca-soap diet (P>0.05). It was concluded that Ca-soap diets are a source of rumen inert fat for both the in vitro incubation and the animals fed with this supplement. Ca-soap had no effect on IVDMD and IVOMD. In vitro gas production techniques can be useful tools to evaluate dietary fats at ruminal level.

scholarly journals Effect of mixture of herbal plants on ruminal fermentation, degradability and gas production

2020 ◽  
Vol 43 ◽  
pp. e48549
Author(s):  
Ahmed Mahmoud Abd El Tawab ◽  
Mostafa Sayed Abdellatif Khattab ◽  
Fatma Ibrahim Hadhoud ◽  
Mahmoud Mohamed Shaaban
Keyword(s):  
Organic Matter ◽  
Ph Value ◽  
Control Diet ◽  
Short Chain Fatty Acids ◽  
Culture Technique ◽  
Gas Production ◽  
Ruminal Fermentation ◽  
Ruminant Diets ◽  
Negative Effect

Reducing livestock negative environmental impacts get great interest in last years. So, present study was carried out to determine the effect of adding different levels of mixture of thyme and celery versus salinomycin on ruminal fermentation, gas production, dry, organic matter and fiber degradation. Four experimental treatments were used by in-vitro batch culture technique, as follow: 60% CFM, 40% clover hay (control), control diet + 2.5 gm thyme + 2.5 gm celery kg-1 DM (T1), control diet + 5 gm thyme + 5 gm celery kg-1 DM (T2), control diet + 10 gm thyme + 10 gm celery kg-1 DM (T3), control diet + 0.4 gm Salinomycin kg-1 DM (T4). Ruminal pH value was significantly increased (p < 0.05) with T4 compared with other treatments. While, the T4 recorded the lowest value (p < 0.05) for microbial protein, short chain fatty acids concentrations (SCFA), total gas production, dry matter and organic matter degradability (DMd and OMd) compared with other treatments. Fiber fraction degradability (NDFd and ADFd) appeared no significant variance (p > 0.05) between control and other treatments except for T1 that recorded the lowest value (p < 0.05). It is concluded that mixture of thyme plus celery could be alternate for ionophores in the ruminant diets to enhance ruminal fermentation, reducing gas production without any negative effect on nutrients degradability.

Research Progress of Methanogens Methanogenic Metabolic Pathway and its Ecological Factors

2013 ◽  
Vol 291-294 ◽  
pp. 290-293
Author(s):  
Xin Yan Liu ◽  
Li Wei ◽  
Fang Ma ◽  
Xiao Chen Huang ◽  
Zhen Zhao
Keyword(s):  
Acetic Acid ◽  
Metabolic Pathway ◽  
Ph Value ◽  
Ecological Factors ◽  
Gas Production ◽  
Ecological Factor ◽  
Physiological Characteristics ◽  
Research Progress ◽  
Control Factor ◽  
Energy Field

Methanogens are important environmental microbial and play an important role in the nature of the carbon-cycling, its unique physiological characteristics and metabolic mechanisms make it play an indispensable role in environmental protection and energy field. At present, known methane biosynthesis has three pathways: acetic acid, H/CO2, methyl compound as the substrates generate methane through different reaction. Ecological factor affecting methanogens are mainly temperature, pH value, redox potential, etc. In this paper, we carry on analyzing the research progress of the methanogens species, its physiological characteristics, metabolic pathway, ecological factor and industrial application, and propose methods and the thinking of study to improve methane gas production by adjusting the ecological factor as the control factor.

Sign in / Sign up

Export Citation Format

Share Document