Tag: in the land of kerala

The process of extraction, purification and refining of metals from ore is called metallurgy.

RCC is Reinforced concrete cement. It is a combination of concrete and steel to build a structure instead of using only concrete. Concrete is good in resisting compression and to gain resisting tension steel is added which has high tensile strength. To overcome the drawback of concrete, reinforced steel bars are used along with concrete.

Aluminium is the most abundant element in the earth's crust. It is most abundant in terms of quantity.

A noble metal is any metal that is found in its metallic form, either pure or alloyed, in nature. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as noble metals.

Coke, limestone flux, and iron ore are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace. Hence, The flux used in the extraction of iron is limestone. 

In blast furnace, products are collected at bottom. So, molten metal should be at bottom and slag is at up. So slag should have low density compared to molten metal.

Zinc Sulphide and Calamine responds for the process because, in $ZnS$, only zinc comes at smelting and after process, high purity comes after distillation. similar to Calamine, after distillation, the metal obtained is pure.

Gold is less reactive element. In electrochemical series, it is lower than Hydrogen. It doesn't react with anything. So it occurs as native metal.

The principle ore of copper is copper pyrite $(CuFeS _2)$ and copper is extracted from this ore.