HOW TO CHECK WHETHER CALCIUM HYDROXIDE HAS DETERIORATED? INSPECTION METHODS AND REASONS FOR DETERIORATION

Calcium hydroxide is widely used in industrial production and life, but we often find that the effect of calcium hydroxide in use is not in line with the routine, so the deterioration of calcium hydroxide has become a problem that needs urgent attention. How to test calcium hydroxide Whether it has deteriorated, and the reasons for the deterioration of calcium hydroxide, we have introduced the following details, let’s find out together!

IDENTIFICATION METHOD OF CALCIUM HYDROXIDE DETERIORATION

1. Hydrochloric acid identification method

Take out some calcium hydroxide and add enough hydrochloric acid. If there is gas, it means that the calcium hydroxide has deteriorated.

2. Water identification method

Another method introduced by calcium hydroxide manufacturers is that after adding sufficient water, there are still insolubles, which also means that calcium hydroxide has deteriorated, because calcium carbonate is insoluble in water.

3. Carbon dioxide identification method

Calcium hydroxide is easily hardened with carbon dioxide in the air to form calcium carbonate. Therefore, we only need to determine whether there is calcium carbonate in the calcium hydroxide powder to know whether it has deteriorated.

REASONS FOR THE DETERIORATION OF CALCIUM HYDROXIDE

calcium hydroxide​​1. The temperature is too high

The reason for the deterioration is temperature, and increasing the temperature can cause thermal cracking or thermal cross-linking of calcium hydroxide. But the basic effect of heat is activation. Improve the oxygen diffusion rate and activate the oxidation reaction, thereby accelerating the oxidation reaction rate of calcium hydroxide, which is a common aging phenomenon – thermal oxygen aging.

…

Details can be accessed by clicking here:https://www.ly-gaifeng.com/blog/how-to-check-whether-calcium-hydroxide-has-deteriorated.html

/by

What should I pay attention to when choosing a row of desks and chairs?

Row of desks and chairs are more common in university campuses and some multimedia classrooms. These desks and chairs are generally used for students to take large classes, which is suitable for classrooms with a large number of students. Although students who use such desks and chairs Most of them are college students, and they are already adults, but they still need to pay attention to details when choosing desks and chairs. To ensure the safety of use, what should be paid attention to when choosing a row of desks and chairs?

1. To have retractable function

The use of rows of desks and chairs is generally to make good use of the space of the lecture hall, so choose rows of desks and chairs. However, when choosing, we should choose some rows of desks and chairs with retractable functions, which can also maintain the neatness and aesthetics of the amphitheatre.

In addition, it will be more convenient for students to use, so when choosing a row of desks and chairs, the functional choice is very important to ensure that it can bring students a comfortable experience, create a high-quality learning environment, and improve students’ learning efficiency.

School Bench Table

2. Ensure security

After all, the use of rows of desks and chairs is for students, and the safety of students in schools has always been a concern of the public. Therefore, when choosing rows of desks and chairs, we need to pay attention to their safety.

The safety of row desks and chairs is mainly reflected in the safety of their materials and structure. Therefore, we need to pay attention to these two aspects when choosing row desks and chairs. They must be safe and environmentally friendly. Firm and stable to avoid endangering the health of students.

…

Details can be accessed by clicking here:https://www.aoyangschoolfurniture.com/aoyang-news/precautions-for-selection-of-row-desks-and-chairs.html

/by

What are the application fields of slewing drive

The slewing drive can be applied to the main engine that does circular motion, such as crane turntable, rotating machinery, and other machines that perform circular work.

Slewing drive can be widely used in the field of construction machinery represented by aerial work vehicles and truck cranes, as well as in the field of new energy represented by solar photovoltaic power generation and wind power generation, as well as other fields of automation, machine tool manufacturing, aerospace communications, etc. It can be said that this product The market potential is huge.

1. The field of beam transport vehicles

The core components of the traditional beam-carrying slewing assembly mostly use traditional slewing bearing products. Since the slewing bearing does not have an outer casing, the corrosion resistance is not ideal. For the steering system that relies on hydraulic cylinders to push the tires, the The range of rotation angles is also greatly limited.

VE Series Slewing Drive

2. Field of aerial work vehicles

Aerial work vehicles are an important application area of ​​slewing drive. Usually, aerial work vehicles require the main engine to have a high safety factor. The high safety of slewing drive (self-locking of worm gears) is the choice of the majority of users as accessories for aerial work platforms. An important factor; on the other hand, the worm gear transmission has a larger transmission speed ratio, which improves the safety factor of the main engine and also omits a set of worm gear reducers for the main engine, thereby reducing the manufacturing cost of the main engine.

…

Details can be accessed by clicking here:https://www.ldb-bearing.com/ldb-bearing-knowledge/slewing-drive-applications.html

/by

How to choose the right vibrating screen?

The vibrating screen is one of the indispensable equipment in the coal mine production line. The working efficiency of the vibrating screen also affects the production efficiency of the coal mine production line. As an important screening equipment, the screening effect of the vibrating screen will affect the use value of the product. Therefore, it is very important to choose the appropriate vibrating screen equipment. Here are some factors to consider when choosing a vibrating screen:

First, the characteristics of screening materials

When selecting a vibrating screen, the characteristics of the materials to be screened should be considered, including the content of the material under the sieve, the content of the difficult-to-screen particles, the moisture content of the material, the shape and specific gravity of the material, and the content of clay and other characteristics.

Linear Vibrating Screen

Second, the structure of the vibrating screen

When selecting a vibrating screen, factors such as the screen area, the number of layers, the shape, size and area ratio of the screen hole, as well as the movement mode, vibration frequency and amplitude of the vibrating screen should also be considered.

…

Details can be accessed by clicking here:https://www.hsd-industry.com/news/selection-of-vibrating-screen/

/by

How to increase the output of high pressure grinding rolls

More and more companies start to use high-pressure grinding rolls for crushing and grinding production for development needs. However, when some companies use them, they feel that their output is not ideal. In fact, this has nothing to do with the work efficiency of high-pressure grinding rolls. Too much relationship, mainly because there may be some problems with the method of use.
​​
The output of the high pressure grinding roll refers to the material throughput of the high pressure grinding rolls, that is, the material handling capacity. Generally speaking, the system is equipped with a process of returning the coarse material to extrusion, and the output is different from the throughput of the high-pressure grinding roll. The following editor will tell you how to increase the output of the high-pressure grinding rolls.

High-Pressure Grinding Rolls

1. The bulk density of the extruded cake

In order to increase the output of the high pressure ball press, it is necessary to know the bulk density of the material cake. The bulk density of the material cake depends on the density and extrusion pressure of the material. The higher the density of the material, the greater the bulk density of the material cake. The greater the pressure, the greater the bulk density. For iron ore, the bulk density of high-grade iron ore is usually obtained by experiments. Generally, the larger the bulk density, the higher the crushing and grinding output of the high-pressure rgrinding rolls, so the output is also related to the products produced.

…

Details can be accessed by clicking here:https://www.zymining.com/blog/increase-the-output-of-high-pressure-grinding-rolls.html

/by

Analysis of Common Failures of Tractor Clutches

The tractor clutch is through the operating mechanism, relying on the friction between the main and driven components, the engine and the transmission are temporarily separated and gradually engaged, so as to provide or cut off the transmission power and ensure the smooth shifting of the transmission system. Some wheeled tractors mostly use friction clutches. Friction clutches transmit power by friction between contact surfaces. The clutch driving disc is connected with the crankshaft of the engine and rotates with the crankshaft, and the driven disc is connected with the input shaft of the transmission.

When sufficient pressure is provided to press the driven piece and the driving piece together, the power of the engine is transmitted to the driven piece through the driving piece due to the friction of the contact surfaces of the principal and driven pieces. When the pressing force is canceled and the master and the follower are out of contact, the power of the engine cannot be transmitted to the follower. Tractor work requires that the clutch can transmit the maximum torque from the engine without slipping, the separation is rapid and complete, the rotational inertia of the driven disc is small, and the engagement is smooth; and the heat dissipation is better, and the operation should be light. If these requirements can not be completed or the completion is not good, it means that there is a fault in the clutch that needs to be identified and eliminated in time.

Tractor clutch manufacturers have conducted a detailed analysis of clutch failures often encountered in use.

 

1. Change of clutch free stroke13-inch

The clutch free travel refers to the distance that the clutch pedal moves from the start of the clutch pedal movement until the clutch starts to disengage. The clutch free stroke has a specified value, and it is not qualified if it is too large or too small. If the free stroke of the clutch is too large, the clutch is not completely separated, and the gear shifting is difficult, which will cause the driven disc to wear out: If the free stroke of the clutch is too small, the clutch cannot be fully engaged, the power cannot be fully transmitted to the transmission, and the driving is weak. The free travel of the clutch pedal is one of the conditions to ensure the reliable operation of the clutch. The free travel of the tractor clutch pedal should be checked regularly and adjusted if necessary.

…

Details can be accessed by clicking here:https://www.syclutch.com/news/tractor-clutch-failure.html

 

/by

How to choose a grow rack?

Nowadays, more and more people grow some flowers and plants at home. Everyone has unique ideas, but many times they do not know what kind of planting frame to choose for indoor planting. is it safe? Will it not be able to grow? How to plant? It has become a problem for everyone. If you choose the right grow rack, it means that it is not a problem! So, how to choose a grow rack has also become a problem that everyone is concerned about. In response to this problem, the relevant personnel of the grow rack manufacturer gave us a detailed introduction.

1. Material selection

The pipes of the grow racks are not only made of PVC, but also of PVC-U, which is in line with international drinking water pipe standards, healthy and safe, and meets EU export standards; the metal brackets of the pipes are made of hot-dip galvanized metal cutting technology, and the brackets are smooth , do not grind hands.

2. Choose security

The grow racks are fixed with screws between the tube clips and the metal brackets, which will not be cut and are more firm. And the opening is smooth without burrs and does not hurt hands, easy to use! The pipeline should be selected to comply with the RoHS standard (EU drinking water pipeline production standard), pass the SVHC test and PAHs test, and meet the pipeline standard of the EU toy standard, so that the planted plants can be safer.

…

Details can be accessed by clicking here:https://www.etegreen.com/blog/how-to-choose-a-grow-rack/

/by

What is the production process of the square bottom machine?

The square bottom machine is mainly a bag making equipment used to produce valve bags made of kraft paper. It is mostly used to produce a square bottom valve bag, such as packing cement, mortar, grain and other granular live powder materials. It can complete 60-120 valve pocket bottom paste work per minute. Let’s take a detailed look at the production process of the square bottom machine.

1. The structure of the square bottom machine

HT120-IIIASF Paper Tube Machine(1) The steel plate of the main engine head adopts 45# steel plate with a thickness of 40mm;​​

(2) The structure of the discharging component adopts 12mm thick steel plate, and the surface is treated with 3 layers of paint;
​​
(3) 120# channel steel is used for the intermediate support;
​​
(4) The coil unwinding unit adopts air-expanded shaft core: 4 sets (45# steel; the surface is quenched by this high frequency; the bearing weight is 1.3 tons);

(5) The structure and parts of other mechanical parts are made of 45#, A3, cast iron and so on.

…

Details can be accessed by clicking here:https://www.lyhuatianm.com/products-information/the-production-process-of-the-square-bottom-machine.html

/by

THE USE OF CALCIUM HYDROXIDE IN THE CHEMICAL INDUSTRY

Calcium hydroxide, commonly known as hydrated lime, is a material based on limestone and is the “first filler” in the industry. It is a binary medium and strong alkali (calcium hydroxide is considered a strong alkali in the middle school stage, but in fact it cannot be completely ionized in water, so it is considered a medium and strong alkali), with alkali properties, good for skin, fabrics Corrosive.​​

Calcium hydroxide is processed through strict calcination of calcium hydroxide production line, processed into high-quality ash as raw material, and then processed through careful selection. The application fields of calcium hydroxide are becoming more and more extensive. It is a commonly used building material, and is also used as a fungicide and chemical raw materials. The development of the industry is also very rapid. Calcium hydroxide has the following uses in the chemical industry:

1. The application of calcium hydroxide in the coating industry is also very extensive. In addition to being used as a filler in coatings, it also replaces titanium dioxide and pigments, and is also used to replace light calcium and precipitated barium sulfate;

…

Details can be accessed by clicking here:https://www.ly-gaifeng.com/blog/the-use-of-calcium-hydroxide-in-the-chemical-industry.html

/by

How to choose student desks and chairs? Purchase methods and skills

Students’ classroom teaching is an important part of students’ receiving systematic education. With the continuous improvement of living standards, students’ physical development is getting better and better, but the desks and chairs used in many schools are still designed according to the height ratio of previous students. Height and width will be somewhat inappropriate.

If students study on such desks for a long time, they will often form bad postures, which will not only affect the quality of students’ learning, but also be detrimental to the cervical spine and spine. So, how should we choose the desks and chairs for students correctly?

How to choose student desks and chairs

High Quality School Table with Chair

1. Purchase according to the student’s height and size

The height of desks and chairs and the height of the human body cooperate with each other, which can adjust the sitting posture. Among all types, lift desks and chairs are more suitable. We all know that children’s bodies grow rapidly. If the desks and chairs are not properly selected, Then it will not be suitable for a long time, and it will not be able to be used again after a year or two. Therefore, it is better to choose a lift desk and chair. Lifting student desks and chairs can not only lift the chair, but also the table, which is more convenient and practical. The desk top adopts multi-angle adjustment components, which can be adjusted to the angle suitable for students to read and write.

…

Details can be accessed by clicking here:https://www.aoyangschoolfurniture.com/aoyang-news/buying-skills-of-student-desks-and-chairs.html

/by