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: an agent that causes deflocculation specifically : a chemical (as sodium carbonate) added to a clay slip to minimize settling out.
What does a Deflocculant do?
The term “deflocculant” denotes a substance which, when added to scattered particles in suspension, causes a reduction in apparent viscosity. Deflocculants are substances which prevent flocculation by increasing zeta potential and therefore the repulsive forces between particles.
What can I use as a Deflocculant?
Sodium silicate, also referred to as liquid glass, is another commonly used deflocculant in slip preparation. In ceramics, sodium silicate can also be used in surface decoration to create a crackled surface texture on pots.
Is Redisperse difficult?
The repulsive forces between individual particles allow them to slip past each other as they sediment. The slow rate of settling prevents the entrapment of liquid within the sediment, which thus becomes compacted and can be very difficult to redisperse.
What does Flocculated mean?
The process by which individual particles of clay aggregate into clotlike masses or precipitate into small lumps. Flocculation occurs as a result of a chemical reaction between the clay particles and another substance, usually salt water.
Is sodium silicate a Deflocculant?
Sodium silicate is the most popular deflocculant used in casting slips for many years (as a source of sodium ions). It is nearly always used with soda ash (when employed alone it can make a slip ‘stringy’ and thixotropic). The material is effective, reliable and inexpensive.
How much vinegar do you put in a clay slip?
To make paper clay slip, follow these simple steps:
- Tear up a few sheets of toilet paper and put them in a container.
- Add 1-2 cups of white vinegar to the torn-up paper.
- Blends the paper and vinegar together using a hand blender.
- Then add some small pieces of broken bone dry clay to the liquid.
What is difference between flocculation and Deflocculation?
The key difference between flocculation and deflocculation is that flocculation is the formation of flocs by the clumping of fine particles, whereas deflocculation is the dispersion of flocs to form a stable colloid. Flocculation refers to the formation of clumps from fine particles in a colloid.
What causes soil dispersion?
What causes soil dispersion? Soils often disperse when they are sodic, which means they contain enough sodium to interfere with the structural stability of the soil.
How do you make a clay slip casting?
Preparing the Casting Slip The process of slaking clay to make it into slip is a simple one. Step one is to have a 5-gallon bucket filled 60-75% with your bone-dry clay then add water until it’s a few inches below the rim (figure 1). Let it slake for 24 hours then mix it by hand a little with a stick (figure 2).
How does vinegar affect clay?
The acidity of the vinegar breaks down the clay a bit, and makes it sticky. Some artists use vinegar straight from the bottle, or add vinegar to clay instead of water to make a joining slip. All these methods work to create a join that is stronger than water or slip alone.
How do flocculating agents work?
Flocculating agents are chemical additives that cause suspended solids to form aggregates called flocs. They act by shrinking the ionic double layer, or neutralizing the surface charge of suspended particles, or bridging between particles.
What is the difference between flocculant and coagulant?
Depending on the charge and chemical composition of your wastewater, flocculants can either be used on their own or in combination with coagulants. Flocculants differ from coagulants in that they are often polymers, whereas coagulants are typically salts.
Why does my clay smell?
When clay is stinky, though, it’s usually good, since that smell only comes when the clay has spent some time in the wet condition. If your clay stinks, that’s a good thing. It means there’s bacteria in it, living on the organic matter in it.
Is CMC a Deflocculant?
Na-cmc is a powerful binder. It is a member of the carbohydrate binder group–the binder group with the strongest binding power. It is capable of acting as a deflocculant in glazes and nonclay casting slips.
Is Vinegar a Deflocculant?
Vinegar is often used in ceramic slurries to change the viscosity (thicken it). While there are more effective flocculants (e.g. calcium chloride, epsom salts), vinegar is popular among potters simply because it is so available.
Can you apply slip to bone dry clay?
When slip is applied to bone dry clay, one part of the pottery will be much wetter than the next. As such slip won’t stay liquid and doesn’t create the liquid soup for clay particles to move about in. So, generally slip is not used to join pieces of bone dry clay.
Is mold in clay dangerous?
It’s true; people can have mold reactions to clay that has mold in it. We’ve heard about several potters that have had allergic reactions to mold in clay. Usually for it to kick up, though, there has to be visible mold—such as you get when a bag of moist clay has been hanging around for a fair amount of time.
Can you reclaim casting slip?
The process is simple, but it is work. Add enough water to the clay to make it fluid. Mix it and mix it until you can break down all the lumps and the slip is smooth. Mix it some more.
Is alum a coagulant or flocculant?
To accomplish this, the water is treated with aluminum sulfate, commonly called alum, which serves as a flocculant. Raw water often holds tiny suspended particles that are very difficult for a filter to catch. Alum causes them to clump together so that they can settle out of the water or be easily trapped by a filter.
Which are the flocculating agents in soil?
In soils, the flocculation process concerns mostly the clay particles present. Clay particles usually possess net negative charge and therefore they electrostatically attract positively charged ions, such as Ca2+ cations, which form bridges, holding the particles together.
What is the other name of Deflocculation?
What is another word for Deflocculation? flocculation. deflocculation and flocculation. coagulation.
