ABSTRACT A sample of high density polyethylene and graphite powder was made to study the effect of graphite power content on the electrical properties of high density polyethylene, graphite offers the benefit of low density and cost when compared to metallic substances used for the same function , the sample was tested with different concentrations of graphite powder (30,40,50)% and in different temperatures, the study reached to the following results: The conductivity of the HDPE was increa...
ABSTRACT. Cost effective steel utilization as distinct from steel utilization is an engineering challenge of our time, especially in this austere period. Steel scrap recovery is defmitely one of the areas to be seriously looked into by Nigerian engineers. After estimating the recoverable steel scrap to the year 200AD, this paper aims at fmding an appropriate technology and size for steel scrap recovery bearing in mind the need for self reliance and the level of our technological advancement....
Abstract Comminution is a critical stage of mineral processing which aims to reduce the size of ore particles through breakage, consequently increasing the likelihood of the liberation of valuable minerals. However, comminution is highly energy-intensive, and an understanding of the key breakage mechanisms has been identified as an important factor in improving the efficiency of the process. Several factors, such as pre-existing cracks, mineralogical composition, ore shape and size are known...
Abstract The Fischer-Tropsch synthesis (FTS) process, better known for its ability to produce synthetic fuel via the hydrogenation of CO, has shown potential to produce valuable chemicals when ammonia is added to the feed. In this work certain aspects of the pathway to the formation of N-containing compounds that form when NH3 is added during FTS, using mostly iron based catalysts is investigated. In addition, the effect this has on the FTS reaction itself is evaluated. To achieve this goal, ...
Abstract Within froth flotation, it is widely acknowledged that froth stability affects flotation performance. As a result, it is expected that through the effective management of froth stability, it would be possible to both control and optimise a flotation cell and bank. However, for this to be possible, the relationships between the operating conditions, froth stability behaviour and flotation performance attributes need to be well understood. In addition, froth stability would need to be ...
ABSTRACT The effect of impurities on the precipitation behaviour of nickel powder produced by high-pressure hydrogen reduction was investigated in order to determine the factors responsible for the formation of powder with undesirable morphology. In nickel precipitation by hydrogen reduction, two product morphologies have been observed: the spherical, open powder (desirable) and the spherical, closing/closed powder (undesirable). Two major impurities were studied namely; a morphology modifie...
More recently, Solvent Extraction of Copper from aqueous solution has been an area for considerable research and development. The present programme has gone a stage further by investigating the separation of copper from mixed solutions cf copper and iron in Electrical fields. The work was carried out in a countercurrent column which gave differential as opposed to the stage contact of previous workers. Continuous transfer of material between phases occurs resulting in the differential change ...
The US Environmental Protection Agency (EPA) issued the first ever federal rule to permanently cap and reduce mercury emissions from coal-fired power plants on March 15, 2005. The rule referred to as The Clean Air Mercury Rule (CAMR) when fully implemented, will reduce utility emissions of mercury from 48 tons a year to 15 tons by 2018, a reduction of nearly 70%. These mandatory declining caps coupled with significant penalties for noncompliance, will ensure that mercury reduction requir...
ABSTRACT In this study, hydrodesulphurization (HDS), hydrodenitrogenation (HDN), hydrodemetallization (HDM), and micro carbon residue (MCR) renoval were investigated using residuum hydrocracking catalysts containing a zeolite component. It to well known that the strong Brønsted acid sites on the external surfaces of zeolite crystals increase the distillate yield and decrease the coke yield obtained when using fluid catalytic cracking (FCC) catalysts. However, comparatively few studies have b...
ABSTRACT Oilseed sunflower is one of the major vegetable oil sources. The residue after the extraction of oil (defatted meal, DM) contains a substantial amount of nutritious protein which is recoverable by extraction and precipitation methods. For effective recovery of the solid proteins from the solids-liquid suspension, it is imperative to have large particles with a narrow spread in their size distribution and high solids concentration. In this research, up to 97 % w/w and 65 % w/w of the...
ABSTRACT This research is based on the modification of a glassy carbon electrode with cobalt (II) tetra carboxy phthalocyanine and nitrogen doped graphene oxide nanosheets composite (CoTCPc/N-GONS) was used for the electrocatalytic oxidation of nitrites. The synthesised cobalt (II) tetra carboxy phthalocyanine (CoTCPc) and nitrogen doped graphene oxide nanosheets (N-GONS) were characterized by FTIR spectroscopy, UV-Vis spectroscopy, electrochemical impedance and cyclic voltammetry. The electr...
ABSTRACT The biodesulfurization of diesel and kerosene was investigated. Soil samples were taken at various points of the Ijora petroleum products haulage terminal, in Lagos, Nigeria. Microorganisms capable of selectively abstracting sulfur from diesel and kerosene without reducing their fuel values were isolated by using a sulfur-reducing selective medium. The choice of the sulfur selective reductive pathway is informed by the fact that it is sulfur specific and so the calorific value is ma...
ABSTRACT The most pertinent problem which must be solved in the design of multicomponent distillation process is the evaluation of the vapour-liquid equilibrium (VLE) ratio and enthalpy (liquid and vapour) values of each component in each of the stages. Good experimental data are not easily obtained but require considerable experimental skill, experience and patience. It is therefore of economical necessity to consider techniques for estimating vapour-liquid equilibrium and enthalpies data fo...
ABSTRACT In this study, the use of purely inorganic filler materials to influence the mechanical properties of flexible polyurethane foam has been investigated. The fillers were calcite (CaCO3), dolomite (CaMg(CO))), and kaolin (ALSO(OH)) of volume fractions ranging from 0 - 40 wt%. Each of the filler content ranges was investigated at the following average particle size distributions: 0.06, 0.5, 3.5, 10, 20, and 841 um. The experiment was performed in a discontinuous foaming process based on...