Calcium Carbonate Cement The material: Calcium carbonate cement is a material that is made up of carbon dioxide (CO2) that has been converted to carbonate (CO3) and bound to minerals such as calcium and magnesium. It is a white powder-like material that can be used as an aggregate or supplementary cementitious material in construction and could substitute Portland cement. The Concept: The process of making calcium carbonate cement was developed by studying the formational process of coral reefs and utilising the principles at work. According to David Biello (2008), when constructing their shells and reefs, coral takes calcium and magnesium from seawater and combines them with CO2 to form calcium carbonate, a solid material, at normal temperatures
After the desired thickness is deposited the pattern with ceramic mold is allowed to dry in air to harden. • Removing pattern and metal pouring: The ceramic mold is heated to remove the wax pattern which melts and flows out at 150 degrees Celsius and the ceramic mold is further heated to 1000 degree Celsius to remove any impurities, moisture etc. that remains in the mold. When the mold still remains hot the metal is poured; which provides the following benefits – the dimensional accuracy is high as hot mold allows the liquid metal to flow easily allowing better dimensional accuracy and allows thin profiles to be
Remove the processed spheroid-containing plug from the cassette. 1.4 Embed the Processed Spheroid-Containing Plug for Sectioning Follow these steps to embed the spheroid-containing plug in wax for sectioning: 1. Remove the spheroid-containing plug from the processing cassette. Using the paraffin-embedding station, fill the depressed portion of a metal mold with liquid paraffin and, with the spheroids facing the bottom of the depressed portion of the mold, place the spheroid-containing plug in the paraffin wax. 2.
In brush bristles setting, Bakelite liquid cement is used. It is also used in wheel manufacture which is abrasive. The powdered Bakelite cement found its extensive application in radio valves and electric lamps manufacturing. The cement in the form of paste is applied to lamp. This paste is formed by adding alcohol in this
This is called a titration. To visualize this reaction during the experiment, an indicator was used. The indicator was called phenolphthalein, which turned a light, red color when an excess of base was present in the solution. This color was observed as the reaction approached equilibrium as flashes of pink. At equilibrium, the pink color became permanent.
Soda ash is added to facilitate easy melting, limestone increases the durability of the product and dolomite is added to improve the working and weathering properties. Other materials may be used as colorants or refining agents. The percentage composition of the raw materials has been shown in the table below. Material Percentage Composition Sand 72.6 Soda ash 13.0 Limestone
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
This demonstrates why so many people are turning to cosmetic surgery. With increasing number of people having cosmetic surgeries done, the society seems to have accepted that it is just an ordinary act to change one’s physical appearance. Since our faces influence our everyday life in numerous aspects, mainly socially and emotionally, there is no wrong in beautifying ourselves. While acknowledging the various causes of people getting cosmetic surgeries, this essay holds the view that cosmetic surgery should be widely accepted because of the benefits it gives to people in daily lives. According to Bandyopadhyay
Whenever you burn a candle, turn on the oven, or strike a match, you witness the combustion reaction. Combustion is a chemical reaction usually including oxygen followed by the production of heat and light in the form of flame. Soaps and Detergents. The two items essential for personal hygiene and getting rid of harmful bacterias clean by the way of chemical reactions. Soap emulsifies grime, which means oily stains bind to the soap so they can be lifted away with water.
What is Saponification? Saponification is the procedure that produces soap from fats and lye. In this chemical reaction we used Sodium Hydroxide which is our base to convert fats or oil as an acid to soap, this happens when the fats or oil gets in touch with Sodium Hydroxide or lye and this turns on the Saponification process. When the Saponification process is turned on, it means lye is converting the oil or the fat to a more uniform and thicker solution, it is having a point which is called Trace point. Trace point the end point, if we add any extra material it will not be chemically mixed with our soap solution it will just stay there.