Table of Contents
What is a Deflocculant agent?
: an agent that causes deflocculation specifically : a chemical (as sodium carbonate) added to a clay slip to minimize settling out.
How does a Deflocculant work?
Deflocculants are electrolyte-sourcing liquids or powders (like sodium silicate, Darvan) that are added in small amounts. They work their magic by imparting electrical charges to clay particles making them repel each other (more accurately it is said to be a condition where repulsive forces predominate).
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.
Which are 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.
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.
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.
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.
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.
What does adding a Deflocculating agent do?
The addition of a deflocculating agent to a soil-water mixture affects the degree of dispersion of the soil sample and may also affect the specific gravity of the soil particles and the viscosity and specific gravity of the suspending medium. 001 mm. , the higher the degree of dispersion.
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.
How do you increase casting rate?
Using a coarser clay instead of a finer one could help improve permeability, hence casting rate. Imerys’ portfolio contains several clays with improved permeability together with good plasticity in order to maintain green strength of the cast item. The use of a faster casting kaolin will improve casting rate.
Can you make slip with wet clay?
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).
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.
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.
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.
What is the other name of Deflocculation?
What is another word for Deflocculation? flocculation. deflocculation and flocculation. coagulation.
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.
How much vinegar do you put in a clay slip?
It’s very simple to make, but it does bond clay together very effectively. 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.
Why is hydrometer test important?
A hydrometer analysis is the process by which fine-grained soils, silts and clays, are graded. The hydrometer also determines the specific gravity (or density) of the suspension, and this enables the percentage of particles of a certain equivalent particle diameter to be calculated.
Which ion causes flocculation?
Dispersion/Flocculation is a purely chemical phenomenon, driven by the balance of cations in the soil. Calcium has a very high flocculation power, while sodium and potassium cause dispersion. The general balance between Ca and Mg compared to sodium is what determines flocculation/dispersion.
