Question

Write any two methods of concentration of an ore with diagram. answer in (70 to 100)word​

Answer 1

Explanation:

To describe the concentration of a solution in the way that is most appropriate for a particular problem or application.

To be familiar with the different units used to express the concentrations of a solution.

Methods of Expressing the Concentration of a Solution

The concentration of a solution can be expresses in a number of ways. The important methods are:

Mass/Weight Percentage or Per cent by Mass/Weight :

It is defined as the amount of solute in grams present in 100 grams of the solution.

\small Mass\ Percentage=\frac{Mass\ of\ Solute}{Mass\ of \ Solution}\times 100

\small =\frac{Mass\ of\ Solute}{Mass\ of \ Solute+Mass\ of\ Solvent}\times 100

\small =\frac{Mass\ of\ Solute}{Volume\ of \ Solution+Density\ of\ Solution}\times 100

The ratio mass of solute to the mass of solvent is termed as mass fraction.

Thus, Mass percentage of solute = Mass fraction × 100

10% solution of sugar by mass means that 10 grams of sugar is present in 100 grams of the solution, i.e., 10 grams of sugar has been dissolved in 90 grams of water.

Answer 2

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Two methods of Concentration of an ore are :

Physical Methods :

1. Hydraulic washing

It also refers as “Gravity separation” or “Levigation”. In the hydraulic wash, the ore is separated from the gangue by the principle of gravitational force. The ore is first crushed into fine particles or powdered form. Then the powdered ore is passed through the current of water.As the ore is more substantial than the gangue particles, it will leave behind, and the gangue will float away through the stream of water. The process of hydraulic washing is accomplished by “Hydraulic classifier” or “Wilfley table”. This method is widely used for the concentration of oxide and carbonate ores.

2. Magnetic separation

The method of magnetic separation is the process of separating ore from the gangue particles based on the magnetic properties of either ore or matrix. In this method, the ore is finely crushed and then passed over the magnetic roller, where one is magnetic, and the other is nonmagnetic.The magnetic ore particles will attract and attach to the magnetic roller, and the non-magnetic gangue particles will separate and fall into the heap from the conveyer belt.

Example: Fe (CrO2)2 (Chromite) is a magnetic ore which can be separated from the non-magnetic silicious gangue.

Chemical Methods :

1. Calcination

• It is the chemical method of separating carbonate or hydrated oxide ores. When carbonate ore subjects to the heat it will produce carbon dioxide. For example: calcination of carbonate ore.
• When the hydrated oxide ore subjects to the heat, it releases water. For example: calcination of hydrated oxide ore.

2.Roasting

It is a process that is applicable for sulphide ore which subjects to the heat and air. In roasting, the sulphide ore is heated at the temperature below the melting point. For example: roasting of ore.