What is slurry sampling?

To explain, whenever slurry is pumped through a pipe, discharged from a mill, flows down a launderer, or is floated over a cell lip, graduation and separation takes place. Size and the specific gravity of the material will dictate where in the flow, the mineral will be.

How do you test for bentonite slurry?

Wash the sand into the tube by pouring water with the help of spray bottle through the screen. Allow the sand to settle down in the graduated glass tube. From the graduations marked on the tube, read the volume percentage of the sand. Report the sand content of bentonite slurry in volumetric percentage.

How do you collect sludge sample?

Using a 500 mL glass beaker and a stainless steel trowel, collect the sample from the belt filter press as the sludge falls into the roll-off container. The first grab sample and all remaining grabs should be approximately equal in volume (~ 200 mL). Do not forget to collect any required field duplicates or blanks.

What is bentonite slurry used for?

Bentonite slurry is one of the most common excavation fluid used in constructing diaphragm wall. Bentonite clay (in powder form) and water are combined in a colloidal mixer and clay particles bond to each other and set to form a gel when left to stand for a period of time.

Why bentonite slurry is used during boring?

Bentonite is a very fine-grained clayey material having a high percentage of montmorillonite material. Bentonite clay is a mined product. Usually, two types are there – Sodium based and Calcium based. Bentonite slurry shall be used for stabilizing the sides of the pile borehole.

What is sludge test?

The most common tests for sediment and sludge are total and volatile solids. (ELL) holds HOKLAS accreditation for total and volatile solids, Settled Sludge Volume (SSV) and Sludge Volume Index (SVI) tests, which help to provide accurate figures to engineers in the design of sewage treatment process.

What is sludge sampling?

In most cases, sampling will be carried out on based on grab samples and the representatively of the sample is fundamental: high turbulence zone for liquid sludge, large sample collected according to recommendations detailed in ISO standard ISO 5567-13 for paste-like and solid sludge.

How do you mix bentonite slurry?

Bentonite can be mixed in two ways. It can be directly mixed with cement (dry-blended) and later the blend is mixed with water/mix water/mix fluid or it can be mixed in mix water (pre-hydrated) and later cement is added in the mixed fluid.

What are the characteristics of sludge?

Sludge is an odious, semisolid residual that resembles thick soft mud produced from the solid–liquid separation processes in wastewater treatment. It is usually very inconsistent in its composition and most often unmanageable.

What is a sludge judge?

Sludge Judge. Measure settled solids in sewage treatment plants, chemical plants, or food processing facilities. Take accurate, noncaustic measurement of settable solids, 5% or less.

Which is the least desirable valve for slurry flow control?

Knife gate valves are the least desirable valve for controlling abrasive slurry. When the gate modulates, acute angles are formed between the gate and valve body. These angles produce high fluid velocities, increasing the wear rate significantly. These valves are typically found in large diameter pipe, as they are economical by comparison.

What kind of steel is a sampling valve made of?

Sampling Valve bodies and spindles are available unlined from 1.4408 / 1.4404 stainless steel, or fully lined with PFA or PFA-AS (anti-static) in order to protect against highly corrosive or aggressive media. For ultimate corrosion protection, our SIV Sampling Valves are also available in exotic metals such as Titanium, Inconel or Hastelloy.

How does the slurry knife gate valve work?

Heavy duty slurry knife gate valve isolates flow even in the most demanding process conditions. The bi-directional flow tolerates backflow and elastomer sleeves on both sides of the gate provide tight shut off. Flowrox knife gate valve follows the concept of the ease of maintenance.

What’s the pressure of a SIV sampling valve?

For ultimate corrosion protection, our SIV Sampling Valves are also available in exotic metals such as Titanium, Inconel or Hastelloy. Depending on the choice of material options, pressure ratings up to 50 bar (725psi) and temperatures up to +280°C (536°F) can be reached.