The micro-control clay absorption blue measuring instrument is a
micro-computer controlled ultrasonic divergence and the stirring of
the test liquid, the sample processing and the stirring time are
automatically controlled and displayed, and the time can be
arbitrarily set by a microcomputer. Equipped with two sets of
burettes, while controlling the titration of methylene blue
titrant. The sample was treated by ultrasonic dispersion method,
and the sample was quickly dispersed at normal temperature. The
measuring device was equipped with an automatic titrator and
mechanical stirring. It is mainly used to determine the amount of
bentonite blue and the effective bentonite content in the molding
sand, and to quickly and effectively detect the quality of the
bentonite, so as to avoid surface defects of the casting after use.
Wuxi Wuway Instrument Co., Ltd. is a technology company
specializing in custom design, innovative R&D, manufacturing,
sales, maintenance and repair of analytical instruments, testing
equipment, industrial automation devices and other products.
For more than ten years, it has had extensive cooperation with many
instrument manufacturers, research institutes and institutions. It
also customizes and develops various analytical instruments and
testing equipment with various functions for them.
The main products include direct reading spectrometer, carbon
sulfur analyzer and foundry sand detectors. They are independently
researched and developed by the company. Products are mainly used
in steel, metallurgy, foundry, machinery, automotive, marine,
aerospace, petrochemical, quality supervision, institutions and
|1||Optical Emission Spectrometer|
|2||Foundry Sand Testing Equipment|
|3||Carbon and Sulfur Analyzer|
|4||Molding Sand Strength Tester|
|5||Molding Sand Air Permeability tester|
|6||Molding Sand Gas Evolution Tester|
|7||High Temperature Performance Tester|
|8||Peeling Performance Tester|
|10||Melting Point Tester|
|11||Methylene Blue Absorption Tester|
|12||Sample Preparation Machine|
|13||Seiving Sand machine|
|18||Crushing Index Tester|
The company's products and technologies have been recognized by the
domestic market in China, and some products have been exported to
The intelligent instrumentation with microprocessor has the
functions of data processing, data display and self-calibration,
self-checking and self-compensation. Fieldbus technology brings the
communication technology of intelligent instrument into the local
The company also provides customers with installation and
commissioning, personnel training, technical support, and one year
warranty , lifetime maintenance and all kinds of accessories and
OEM, ODM can be available.
We keep up with the pace of technological advancement, online
testing, remote control and other functions have gradually been
applied in different products, and the application of 5G technology
is already in our plan.
Special introduction to Clay absorption blue amount tester
One: Principle and structure of micro-controlled clay blue
Bentonite in clay has a strong adsorption capacity for methylene
blue. The adsorption capacity depends on the type and origin of
bentonite, but it also has a certain relationship with the degree
of dispersion of bentonite. Therefore, the sample must be fully
dispersed before measurement. In order to more accurately determine
the largest amount of blue absorption.
Ultrasonic dispersion treatment of bentonite samples is based on
ultrasonic waves to create a "cavitation" effect in the liquid,
that is, the liquid will produce many tiny "holes" in the high
frequency ultrasonic waves. When these "holes" grow to a certain
size or are subjected to pressure waves, they will quickly burst.
The instantaneous collapse of these holes can generate high
temperature and high pressure, causing local shock waves in the
liquid, which has a strong dispersion effect. Therefore,
contaminants or aggregated agglomerates attached to the solid
surface are quickly separated. By using this principle, the clay in
the sample can be dispersed into fine particles or peeled off from
the surface of the sand to fully disperse.
When the blue amount of the sample is measured by titration,
mechanical stirring is required at the same time, and the sample is
sufficiently contacted with methylene blue to carry out an
adsorption reaction. The sample suspension was gradually titrated
with a methylene blue solution and subjected to a spot test on a
filter paper. When free methylene blue is found in the suspension,
it is concluded that the sample has reached saturated adsorption
(the titration reaches the "end point"), thereby measuring the
amount of blue absorption of the sample.
Two: Instrument structure
The methylene blue clay analyzer is mainly composed of a sample
dispersing device, a mechanical stirring and a titration device.
The two units are independent and can work simultaneously, with the
microcomputer controlling the dispersion processing and mixing time
separately. Its structure is shown in the figure below:
(1) The sample dispersion device is composed of an ultrasonic
cleaner (ultrasonic disperser), an accessory, and a timer. The
ultrasonic cleaner is a small desktop full-transistor circuit
ultrasonic device. The device adopts a pressure point ceramic
material, an aluminum zirconate titanate transducer, which has high
conversion efficiency, good dispersion effect, low noise, and low
power consumption. The ultrasonic cleaner can be used alone.
(2) Titration device
The automatic titrator has two automatic burettes, a burette 1 and
a burette 2. The burette 1 is controlled by a "titration switch"
and a high performance anticorrosive solenoid valve DZ1 to control
the titration of the methylene blue solution; the burette 2
squeezes the glass beads by hand to titrate the methylene blue
solution. When two burettes are used simultaneously, the milliliter
of the titrant must be read and added simultaneously. The solution
bottle can be used with a 500ML small-mouth reagent bottle or a
1000ML small-mouth reagent bottle. After adding the methylene blue
solution to the reagent bottle, the high-performance anti-corrosion
solenoid valve DZ2 is controlled by the “liquid-filling switch”,
and the gas source is pressurized by the DZ2 to make the methylene
blue solution simultaneously. Burette 1 and burette 2, when the
solution is filled with the burette. Release the “Dosing Switch”
and return the solution to the solution bottle. The titrant is
The working time of the AC motor is controlled by a microcomputer,
and the coupling shaft is connected to the stirring shaft by the
coupling to sufficiently stir the test liquid.
2. Installation of the instrument
1. Before installing the instrument, check whether the components
are complete, whether there is any damage, and wipe the parts
2. Place the instrument on a stable platform and connect the
instrument's power cord to the AC220V/10A three-pin socket. Note
that the power supply must be grounded to avoid operator shock.
3. Align the centerline of the chassis on the beaker carrier with
the agitator shaft. Then tighten the set screw.
4. Place the solution bottle near the instrument. There are two
straight tubes on the rubber stopper. One of them must be close to
the bottom of the bottle and connected to the “inlet” with a hose.
The other one receives the "air outlet" and must tighten the rubber
stopper. Put the rubber double ball (or have a compressed air
source, pay attention to the air pressure should be less than
0.05Mpa) and connect it to the "air inlet" with a leather tube.
5. Insert the ultrasonic power plug into the ultrasonic designated
socket on the back of the instrument and set the ultrasonic
original timer to the normally open state.
6. The ultrasonic cleaner can be used alone. When plugged into the
socket specified by the instrument, be sure to set the timer on the
ultrasonic cleaner to a continuous normally open state.
Three: Technical parameters
1) Burette 25ml +25ml accuracy ± 1%;
2) stirrer speed 1300r/min;
Power supply 220V ± 10%, 50Hz;
3) Timer timing range 0~99 minutes;
2. Sample Dispersion Device (Ultrasonic Disperser Model 50)
1) Ultrasonic frequency 40 ± 2 kHz;
2) Output power 50W;
3) Power supply 220V ± 10%, 50Hz;
4) Dispersion groove size (length × width × height) 150 × 140 ×
5) Dimensions (length × width × height) 177 × 167 × 200mm
Four: Preparation of the micro-controlled clay blue absorption
tester before use
1. Stirring time and setting of ultrasonic divergence time
Key Description: “Start/Stop”: Used to start and pause the timer;
when setting the timing time, add one button. “Reset”: Used to
restore the timer to the set value and terminate the operation;
when setting the timing time, it is the minus one and the
Press the “Start/Stop” button, the countdown starts, the
corresponding agitator works, and the decimal number of the right
digit of the digit is lit. When the time is up, the display window
displays “00” and the corresponding infrared light is off, and the
decimal point is not lit. The timer automatically returns to the
set value. When the timer starts, press the "Reset" button to stop
working. When the timer is working, press the “Start/Stop” button
again to pause the timer and the mixer pauses. During the pause,
press the “Start/Stop” button again to resume the timing; or press
the “Reset” button to stop the operation and the timing returns to
the initial state.
Set the timer time according to the required time. Set the stirring
time and ultrasonic divergence time: Press and hold the
“Start/Stop” button. After 5 seconds, the instrument will return to
the machine time 3.0, and the decimal digit of the tens digit right
lower foot will light. Press the “Start/Stop” button again, the
number is incremented by 1, and the “Reset” button will be
decremented by 1. Adjust the number to the value to be set, and
then press the “Reset” button for 5 seconds, the decimal point will
not light, and the digital display will be the set time. Set
another time in the same way as above.
2. Ultrasonic dispersion (cleaning)
(1) Add distilled water or clean tap water to the disperser tank,
and the liquid level is 40~45mm. Insert the power plug of the
diffuser into the socket hole (ultrasonic power supply) on the
instrument timing controller. The ultrasonic power supply on the
instrument is AC220V, which has the function of timing on and off.
Just set the timer on the ultrasonic diffuser to normally open. .
Set the timer to 5 minutes.
(2) When using alone, plug the ultrasonic diffuser power plug into
the AC220V socket, push the button on the diffuser to the 5 minute
position, press the “switch” timer light, the disperser starts
working, observe the water in the dispersion tank. Whether the
vibration is normal. The disperser stops automatically after 5
minutes of operation and the indicator light goes out.
2. Automatic titrator
(1) Connect the two skin tubes on the rubber stopper of the
solution bottle to the “inlet port” and “outlet port” respectively,
and inject the methylene blue solution prepared in the brown bottle
at the specified concentration into the 500ML solution bottle, and
then The solution bottle is tightly capped.
(2) Connect the double-ball inflatable ball or the air source to
the air intake hole (if there is a gas source, the air source
pressure can't be greater than 0.05Mpa), compress the double-ball
(inflated ball) with the left hand, and inflate the solution
bottle. Pressurize, hold down the "Add Liquid" switch by hand, the
solenoid valve opens, and the methylene blue titration solution is
pressed into the burette.
(3) When the liquid in the burette rises to the overflow portion
where the top is enlarged, raise the dosing switch and the solenoid
valve closes. The liquid level in the burette is automatically
(4) During the process of inflating and pressurizing the solution
bottle, care should be taken to check the mouth of the solution
bottle, and there should be no leakage or leakage.
3. Sample preparation
(1) The sample shall be dried to a constant weight at 105 ± 5 ° C
and placed in a desiccator for cooling.
(2) 0.20 g of the bentonite sample (5.0 g of the molding sand
sample) was weighed into a 250 mL glass using a 1% g balance.
(3) Add 50 ml of a 2% sodium pyrophosphate solution to the beaker
and shake well. If it is found that the bentonite has
agglomeration, it should be carefully ground with a glass rod. Be
careful not to carry out the bentonite when the glass rod is taken
Five: Use of micro-controlled clay blue measuring instrument
1. Place the glass beaker containing the sample suspension in the
ultrasonic disperser so that the bottom of the beaker is immersed
in water for about 5~8mm.
2. Set the ultrasonic timing to 5 minutes (when used alone, the
dispersion timer knob is set to the 5 minute position), press the
“Start” diffuser to start working. Observe the oscillation of the
liquid level of the beaker. The liquid surface should be corrugated
or waved. Otherwise, the amount of water added in the ultrasonic
wave can be adjusted to obtain the best oscillation effect of the
suspension in the beaker.
3. After 5 minutes, the disperser stops working automatically. Take
out the beaker and dry the bottom. Place the beaker in the beaker
bracket of the blender, and smoothly raise the beaker bracket so
that the bottom of the beaker is about 5 mm away from the blade on
the stirring shaft. Tight bracket. The glass titration head should
face the beaker mouth.
4. Press the titration switch to start titration.
5. Observe the amount of methylene blue solution dropped into the
beaker from the scale on the burette. When the sample is expected
to absorb 80-90% of the blue amount, close the titration valve DZ1
or stop the glass beads.
6. Set the stirrer timer time to 2 minutes (120 seconds) and press
the “Start/Stop” button to start the mixer. Stop automatically
after 2 minutes.
7. Dip a little test solution on a medium-speed filter paper with a
glass rod to observe whether there is a pale blue-green halo around
the droplets on the filter paper, and note the methylene blue
dropped into the sample solution under the droplet dot. The number
8. If there is no halo, add 1ml of methylene blue solution, then
stir for 2 minutes, and carry out the drip test. If halo has not
appeared, continue to drop 1ml of methylene blue, and then proceed
until the blue spot is found. A pale blue-green halo appears around
9. After stirring for 2 minutes, do another drip test. If the halo
has disappeared, indicating that the end point has not been
reached, the amount of methylene blue should be increased (0.5 or 1
ml can be added). If the halo is no longer disappearing, it
indicates that the sample has reached saturated adsorption, and the
free dye has begun to appear in the sample. At this time, the
amount of methylene blue is dropped, which is the blue amount of
10. After the titration is complete, remove the beaker and wash it
for future use.
11. Precautions for titration test:
(1) The drip test should be carried out regularly on the filter
paper, and the amount of blue at each point should be indicated.
(2) The size of the spot should be 10~15mm in diameter, and should
not be too small, so as not to affect the accuracy of the test.
(3) The light blue-green halo width is 0.5 to 1 mm.
(4) In order to facilitate the judgment and comparison of the
endpoint value of the drip, after the halo has reached the end
point, add 1 or 2 drip tests and do 1 or 2 overdose tests for
(5) If the methylene blue is dropped * times, a wide halo appears,
indicating that the methylene blue added at the beginning is
excessive, and the sample should be changed again for measurement.
(6) Boronite sample weight is 0.2g, methylene blue solution
concentration is 0.2%, so the number of milliliters of methylene
blue is titrated, which is the amount of blue absorption (g) of
(7) When determining the amount of effective boronite in the sand,
the amount of boron soil can be 0.2, 0.3, 0.4, 0.5g in order, so
that the total weight of the sample is 5g, and the measurement
method is the same as before.
Six: Maintenance and maintenance of methylene blue clay analyzer
1. When there is no water in the dispersion tank of the ultrasonic
disperser, it is forbidden to start the machine to avoid damage.
2. After use, the water in the dispersion tank should be drained
and dried, the power plug should be pulled out, and covered with
plastic to ensure that the disperser is clean and dry.
3. After the disperser has been working for a period of time, the
water temperature will gradually increase and the chassis will heat
up (it is normal). Allow continuous working time to limit the water
temperature in the dispersion tank to not exceed 50 °C, otherwise
stop or replace the water in the dispersion tank to speed up
cooling. In hot summers or in high temperature environments, the
continuous working time should not exceed 30 minutes.
4. After the test is completed, the remaining methylene blue
solution in the burette should be returned to the solution bottle.
Seven: Application of determination of blue absorption
1. Assess the quality of boronite
The smectite minerals in the bentonite are mainly montmorillonite
minerals. Therefore, it can be considered how much the
montmorillonite in the bentonite reflects the adhesion of the
bentonite. Since the montmorillonite mineral has the ability to
adsorb pigments such as methylene blue, the bentonite blue amount
method can be used to test the montmorillonite content of the
bentonite, and the quality of the bentonite can be evaluated. In
foreign countries, the amount of bentonite blue was divided by
0.442 to calculate the montmorillonite content of bentonite. Later,
some people changed the coefficient to 0.47, 0.49 or 0.56, but the
test results show that these coefficients are not accurate enough.
Therefore, it is recommended that the montmorillonite content does
not have to be calculated during the test, and only a few grams of
methylene blue adsorbed per 100 g of bentonite actual bentonite can
be measured. The test results show that the amount of bentonite
blue is linear with its cohesive force, so the determination of the
amount of bentonite can be used as an aspect to evaluate the
quality of bentonite. Of course, in order to comprehensively
evaluate the quality of bentonite, tests such as hot wet tensile
strength, wet compressive strength, and post-baking adhesion force
are also required. The amount of bentonite absorbed by blue is
expressed as the number of grams of methylene blue per 100g of
bentonite, which can be calculated as follows:
Where: MB-blue amount (g/100g sample);
A-methylene blue solution concentration, that is, the number of
methylene blue per ml (g / mL);
B-methylene blue solution titration (mL);
C-sample weight (g).
2. Assess the reusability of bentonite
When bentonite is heated, it usually loses intergranular water at
100~110 °C. When the temperature rises above 300 °C, it begins to
lose OH crystal lattice water in the crystal structure of
montmorillonite. At about 500 °C, it quickly loses OH water. The
crystal structure of the montmorillonite is destroyed, and the
bentonite becomes a "dead clay" that loses adhesion. While the
bentonite loses its cohesive force, the ability to adsorb methylene
blue is also greatly reduced. Therefore, the change of the amount
of bentonite absorbed by the highly-fired bent carbon is measured,
and the performance of the bentonite used repeatedly in the casting
process can also be explained. This is used to assess its
reusability. Test method: After the bentonite was calcined at 550 °
C, the amount of blue absorption was measured, and then the
percentage of decrease of bentonite compared with the amount of
blue absorbed by bentonite after drying at 105 ° C was taken as one
of the indicators of retentability of bentonite.
3. Determination of effective bentonite content in shaped sand (old
Bentonite having a binding force in molding sand (old sand) is
called effective bentonite. Its content directly affects many
properties of the sand, such as the reduction of effective
bentonite, which will reduce the wet strength of the sand, the hot
and wet tensile strength, and cause sand casting defects in the
casting. Therefore, the determination of effective bentonite
content in sand by titration is one of the important testing items
for controlling the quality of sand in production.
When determining the effective bentonite content in the sand, a
standard curve is first used. In the measurement, the raw sand and
bentonite in the foundry were dried in an oven at 105-110 ° C,
respectively. Weigh the bentonite 0.10, 0.20, 0.30, 0.40g, and add
the original sand 4.90, 4.80, 4.70, 4.60g, respectively, so that
the total weight of bentonite and raw sand is 5g. Then, it was
poured into an Erlenmeyer flask, 50 ml of distilled water was
added, the sample adhered to the bottle mouth was washed out, and
the amount of blue absorption per sample was measured according to
the procedure of the aforementioned methylene blue titration
method. Take the % of bentonite in the sample as the abscissa and
the methylene blue titration as the ordinate to draw the
calibration curve, as shown below:
Weigh the sand (old sand) 5g, and measure the methylene blue titer
by the same method, then we can find the effective bentonite
content in the sand or old sand from the calibration curve.