Crucible Functions And Uses

November 3, 2021

A porcelain crucible is a laboratory material used to heat, melt, burn, and calcine substances. Being made of porcelain, it can withstand high temperatures. Often used in gravimetric analysis.

Porcelain crucibles are used to perform quantitative gravimetric determinations of various substances. Some crucibles have small holes in their lower part, these allow a filtration process to be carried out; which is very useful when making gravimetric measurements.

These instruments are highly resistant to temperature changes, can operate at a maximum temperature of 1100 ° C, are made of graphite and clay, their expansion is minimal and have high chemical resistance.

The Crucibles and their lids are made of high temperature resistant materials, usually made of porcelain, aluminum oxide or an inert metal. One of the earliest uses for platinum was to make crucibles. Ceramics like alumina, zirconium oxide, magnesium oxide, will tolerate the highest temperatures. Metals such as nickel and zirconium have only recently been used.

Caps are typically loose and loose so we can allow gas to escape during sample heating.

Table of Contents

Uses and Functions

Crucibles are used in quantitative gravimetric determinations, that is, an analysis measuring the mass of the substance to be analyzed. In common crucibles, a residue or precipitate resulting from an analysis method is collected or filtered into an ash-free solution or element. The crucible and the element to be analyzed are pre-pressed with high precision and then incinerated in the furnace. The filter paper will burn without a trace.

The sample and the crucible are allowed to cool in a desiccator and the ashes will be subjected to gravimetric analysis .

To melt or heat with the porcelain crucible it is necessary to use flames or tongs to remove it from the flame. Before using it, it is necessary to preheat it to eliminate any trace of humidity that could alter the analyzes to be carried out.

If the crucible contains a substance, which is heating up, you should never point it at your face, body, or lab partner.

The crucible should be allowed to cool in a desiccator. Once the crucible is cold, the dead can be subjected to a new gravimetric analysis

Crucible types

They are those that are made according to their chemical composition and will depend on the metal to be melted.

  1. Graphite and silicon carbide base.- Used to melt gold, silver, copper, other metals and alloys.
  2. Made of granite clay.- Special for melting iron, withstand temperatures of up to 1,200 ° C.
  3. Alumina (aluminum oxide) .- Specially formulated to melt bronze and other metals such as copper, silver and gold.
  4. Porcelain or mullite.- It is the most used in laboratories, especially for qualitative inorganic analysis.
  5. Zirconia.- Suitable for melting metals at 2,400º C

Other Porcelain Materials

Porcelain combustion boats: Made of unglazed porcelain, ideal for combustion processes or melting metals. Maximum temperature 1350ºC

Porcelain spatula: In chemistry, it is one of the main laboratory materials. It is used to take small amounts of compounds that are basically powder. It is usually classified within the metal material and it is common to find the term spatula tip in technical recipes to refer to that amount approximately. They have two curvatures, one on each side, and each one facing away from the other.

A Büchner funnel is a piece of chemistry laboratory equipment used to perform filtration. It is traditionally produced in porcelain, classifying itself among the porcelain material.

A mortar is a tool used to grind and mix substances, chemicals in a laboratory or even food in the kitchen. The mortar comes with a heavy stick, made of porcelain, wood, or other materials, the rounded end of which is used for crushing and grinding. It is a container that can be made of porcelain, wood, carved stone, or other materials. The substance is ground between the arm and the mortar by rubbing or tapping the bottom, thus turning it into a fine powder.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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