Metakaolin Vs Calcined Kaolin

Ever wondered why concrete giants are so durable? How does the white wall paint stay so smooth and bright? Clay is a type of special white dirt that has a lot to do with the secret. Builders and painters don’t just use this clay right away. Heat is used to alter the clay’s properties.

You can get two useful products when you heat certain types of white clay. You may hear “calcined” kaolin or “metakaolin”, if you’re learning about pottery, construction, and making things.

Both materials are made from dirt but perform completely different tasks. What’s the difference between calcined and metakaolin?

This guide will explain what exactly these materials are. Learn how these materials are created, what they do, and why we need them in our daily lives.

What is Kaolin Clay?

We need to know where both metakaolin and calcined Kaolin come from. Both start out as kaolin.

Kaolin is an extremely soft and bright-white clay. It can be found buried underground in various parts of the globe. This white clay has been used for centuries to create beautiful porcelain plates and cups.

Kaolin, in its original form, is full of moisture. This is not just a slurry that can be dried in the sunlight. Water is trapped inside tiny clay building blocks. Natural kaolin, because of the hidden water in it, is flexible and easy for molds.

Sometimes, however, makers and builders do not like the watery, flexible clay. The material they want is either hard or strong. It can also be ready for mixing with other chemicals. They have to bake clay in order to get this.

Calcining: The magic of heat

Scientists and builders can transform natural clay to something else by using a “calcining” process. Calcining means heating up something really, really hot.

Imagine baking a cake. Take a wet and sticky batter, put it into a hot oven. Heat changes the batter. The batter puffs, dries, and becomes a cake. This cake can’t be turned back into a wet mixture again.

Kaolin is also treated in the same way. Kilns are huge ovens that heat up the white raw clay. The hidden water in the clay evaporates as the temperature increases. Clay changes both its form and rules. It changes completely when it cools.

The heat in the oven can be changed to produce metakaolin, or calcined Kaolin.

What is Metakaolin?

Metakaolin forms when raw kaolin is heated.

Workers heat an oven up to medium temperature. This is usually between 500 and 600 degrees Celsius (1000 to 1100 Fahrenheit).

The hidden water in the clay is baked out at this temperature. The heat does not reach a temperature that will completely dry out the clay. The clay has become stuck in its middle.

Metakaolin, because it’s stuck in the middle is very “reactive.” It is eager to mix and connect with other materials. Metakaolin acts as a sponge when added to certain mixes. It grabs other chemicals, locking them together.

Metakaolin is a special material for construction because of its eager nature.

What is Calcined Kaolin?

You can get calcined Kaolin by leaving the clay inside the oven for a long time and increasing the temperature.

Workers heat up the oven to a much higher temperature than usual. The clay is baked until all the water has evaporated and the tiny blocks of clay are locked in place.

When the clay is super-hot, it loses its “reactivity.” The clay loses “reactivity”. It becomes a very white substance that is very solid and stubborn. The substance will not shrink or change form, nor will it react with other chemicals.

Imagine calcined Kaolin as a brick. It’s tough and strong and wants nothing more than to do its work.

Metakaolin and Calcined Kaolin: the main differences

Let’s look at their big fight: metakaolin and calcined Kaolin. What makes them different if they are made from the same soil?

The two most important differences are listed below.

1. The Baking Temperature

It all comes down to the temperature of the oven.

• Metakaolin Baked at medium heat. The product is not fully cooked.
• Calcined kaolin: Baked at super high heat. The kaolin is completely cooked.

2. How They Act with Others

They behave differently because they have been baked differently.

• Metakaolin Extremely reactive. It tries to attach itself to other chemicals in order for it create new chemical bonds.
• Kaolin kaolin: Non-reactive. This substance likes to be left alone. It does not like to mix with others.

Metakaolin is used for what?

Metakaolin reacts readily with other materials and is used to create super-strong products.

Concrete is the main job of this company. The gray material we use for sidewalks, tall buildings, and bridges is concrete. Concrete is made by mixing water, sand and rocks with a powdery gray substance called cement.

The cement that is left behind after mixing with water becomes hard but also weak and powdery. Metakaolin, when added to the mix of wet cement, quickly grabs hold of the weak remnants. The weak pieces become strong adhesive.

Metakaolin-concrete buildings are extremely durable. The concrete can withstand salt water from the ocean, freezing ice and even heavy trucks. Concrete is durable and doesn’t crack as easily.

Calcined Kaolin: What Can It Be Used For?

Kaolin that has been fully calcined does not react to other materials. This is why it’s used as “filler.” Filler is material that you add to a recipe in order to thicken, make it whiter or strengthen.

You can find calcined Kaolin in the following places:

Making Paint Brighter

Ever painted a wall that was dark with a bright white color? The secret is usually calcined kaolin. Paint makers use it in their paint because the ultra-high temperature of the oven turns the white clay bright. The paint can easily cover dark colors. The paint will be more durable and you can clean the walls without damaging it.

Fixing Pottery Glazes

Potters use it a great deal. You paint a “glaze” liquid on a ceramic bowl before you put it into the kaolin.

The glaze will shrink if a potter adds too much wet, raw clay to their recipe. It cracks off of the bowl when it shrinks.

Potters can fix the problem by substituting calcined Kaolin for some raw clay. The calcined clay is not going to shrink any more because it has already been baked. The bowl stays smooth and crack-free with the glaze.

Strengthening rubber and plastics

Plastic toys and rubber tires are everywhere in your home. Often, factory workers mix calcined Kaolin Powder into rubber and plastic. Plastic and rubber retain their shape thanks to the tough clay. The clay prevents the plastic and rubber from melting easily, as well as protecting them against being scratched.

Trusted Source for High-Quality Calcined Kaolin

If you’re looking for a reputable manufacturer, exporter, and supplier of Kaolin, consider choosing high-quality products from trusted industry experts. Shree Ram Kaolin offers premium calcined kaolin powder known for its excellent brightness, consistency, and performance across applications like paints, ceramics, rubber, and plastics. Their advanced processing ensures reliable quality and bulk supply, making them a preferred choice for businesses seeking durable and efficient material solutions.

Summary

It’s really about heat that the story is of metakaolin and calcined Kaolin.

The two materials begin their journeys as white, plain kaolin soil dug out of the ground. By putting the materials in a very hot oven we can change their fate.

Metakaolin is made by baking the clay in a moderate heat. It is then ready and eager to respond, allowing us to build some of the strongest concrete structures in the world.

Calcined Kaolin is made by baking the clay in a high-temperature oven. It becomes hard and white. It is used to brighten paints and plastics.

The fact that we can bake a white clay to make the walls we paint, our buildings, plates and even the paint we use is incredible.You can learn to make pottery if you enjoy making stuff. Mix your own glaze using calcined and raw kaolin. There are endless possibilities in the world of clay!