The scarcity of fine aggregate for the production of mortar and concrete, as partial replacement of sand by Copper Slag have been identified. Several researchers have investigated the use of copper slag in the production of cement, mortar and concrete as raw materials for clinker, cement replacement, coarse and fine aggregates. This paper reports on some experimental investigations on the influence of partial replacement of sand by copper slag on the mechanical properties of concrete. M30 grade concrete was designed using copper slag, partially replacing the fine aggregate The fine aggregate was replaced by copper slag at various percentages ranging from 0%, 10%, 20%, 30%, 40%, 50%, 60%, 80% and 100%. The mechanical properties of concrete determined in the laboratory include compression strength, splitting tensile strength and flexural tensile strength.
Balanced chemical equation for the formation of copper sulfide from copper and sulfur. First, we set up the equation xCu(s) + yS(s)→ CuxSy (s) . We knew the empirical formula for copper sulfide is Cu2S. Based on the law of conservation of matter, we got the balanced equation: 2Cu + S = Cu2S 9.Percentage Error
This is because the steel is hard but brittle and has internal stresses. The solution to this is by tempering to increase toughness, reduce the brittleness but in turn reduces hardness. Tempering a steel heats up the steel to temperatures ranging from 200-500°C depending on the desired mechanical properties. Heating after the quenching allows the carbon to diffuse into the martensite to relieve internal stresses. The end result would be the shock absorption capability which depends on the tempering temperature (higher the temperature, higher the shock
The resulting molten material is called the blister and contains about 99% copper by mass. (Cavette, 2007) Refining The copper blister is 99% copper but it still have a higher level of sulfure, oxygen some other impurities and by the reason it has to be further refined in order to purifies the cupper, this done by fist firing refined before it is sent to the final electro fining process • The blister copper is heated in in the refining furnace that is similar to the converter ,air is blown into the molten blister to oxides the impurities and a sodium carbonate is added to remove traces of arsenic and the antimony, • The blister copper is heated in a refining furnace, which is similar to a converter described above. Air is blown into the molten blister to oxidize some impurities. A sodium carbonate flux may be added to remove traces • Then the purified copper in then poured into the molds to form large electric
Test Procedure Firstly, the inner surface of the mould was cleaned. The bottom of the mould was placed on a clean, smooth, horizontal, firm and non-absorbent surface steel plate. Secondly, while firmly holding the mould, it was filled with fresh concrete within 2 minutes after mixing. The mould was filled in three layers, each approximately one-third of the height of the mould when tamped. Thereafter, each layer was tampered with 25 strokes of the tamping rod; the strokes were distributed uniformly over the cross-section of the layer.
In addition to ZnO (zincite), indicating that the preparation layer is a mixture of lime, sand and zincite. The XRD analysis confirmed that, the inner coarse ground layer contain mainly calcite (CaCO3) mixed with quartz (SiO2). Spectrum of XRD shows that the materials composition of the fine ground
The extraction efficiency was most successful with dichloroethane as diluents than any others. Stripping study was carried out with hydrochloric acid. The method was applied for the separation of Mo from minerals composed of different kinds of metals. In this experiment molybdenum was determined by drywashing it and was followed by spectrophotometrically analysis as a complex with Tiron at 390 nm. Turel and Patil (1996)  have established a rapid and selective method for the extraction of molybdenum with malachite green into nitrobenzene.
The qualification tests have shown that the efficiency of the EMMAC process on nickel alloys is reduced. The EMMAC process is widely used in France because it is efficient with regards to the type of contamination encountered (hot fixed contamination) and the 6 materials concerned. The chemical products used and the effluents generated are also compatible with the waste treatment systems of the nuclear plants. Westinghouse has used this process during artefact testing. Dilute concentrate decontamination (DCD)  Dilute chemical decontamination techniques use dilute solvents (i.e.
nZVI possesses a large removal capacity, fast kinetics and high reactivity for the degradation/removal of many environmental pollutants (Chen et al., 2012; Chen et al., 2013). It has also been confirmed in previous studies that nZVI has higher absorption and enhanced reactivity for Cr(VI) removal (Zhang et al., 2013) compared to other materials (Montesinos et al., 2014). However, bare nZVI are prone to rapid agglomeration leading to the formation of micro-sized aggregates which lead to loss in reactivity and reduced in the environmental mobility (Grieger et al., 2010). This is attributed to their rapid oxidation, magnetization and high reactivity (Zhang et al., 2013; Zhou et al., 2015). One of the proposed method to overcome this drawback is to coat the nZVI particle surface with surfactants, upon rapid desorption of surfactants into the waste water the particle stability would markedly reduce.
The same water was used for mixing and curing of concrete cubes. Name of Test Results Coarse Aggregate Fine Aggregate Specific gravity 2.56 2.63 Absorption (%) 0.51 0.71 Fineness Modulus 1.6 6.9 Table 3: Physical properties of aggregates Pozzolan: The cement replacement material that used in the test was local natural pozzolan from Mont Popa. The chemical composition of pozzolan is given in Table 4. It is evident that the local natural pozzolan conforms to the requirements of ASM C 618 and hence, can be used as a partial replacement of the production of roller compacted concrete. Description Composition (%) Local Natural Pozzolan Requirements as per ASTM for class N Silicon dioxide (SiO2), aluminum oxide (Al2O3) and iron oxide (Fe2O3) 77.3 Min 70.00 Sulfur trioxide (SO3) 0.34 Max 4.00 Loss on ignition (%) 2.26 Max 10.00 Table 4: Comparison of local natural pozzolan with Class N of ASTM C 618 Method: The soil compaction method is the most widely used mixture proportioning method for RCC pavements.