What is a grinding wheel?

 Grinding wheel is the tool used in the process of grinding (grinding).

Comparison with cutting tools such as turning and milling

• ① Easy to process hard, brittle and other materials that are not easy to process by cutting tools
• ② It is easy to achieve the dimensional accuracy required by finishing
• ③ Better surface roughness and gloss can be obtained
• ④ Due to the large number of tool tips, the processing speed is fast, even if the feed is small
• ⑤ It has self sharpening function and can be processed continuously for a long time

How are grinding wheels made?

The manufacturing process of grinding wheel goes through five stages: grinding, forming, sintering, finishing and inspection.

Three basic elements of grinding wheel

1. Abrasive grains: responsible for cutting.
2. Binding agent: fixed abrasive particles.
3.  Air hole: it helps to remove chips and dissipate heat.

More details about grinding wheel please visit: https://www.beidoou.com/solutions/grinding-wheel-types-how-to-choose.html

How to build an aggregate production line

 1. What is aggregate?

Aggregate is granular loose material which plays a role of skeleton or filling in concrete. Application of aggregate in Civil Engineering: cement concrete, asphalt concrete, road foundation, railway ballast, mortar, etc.

2. How many types of aggregates can be classified?

Generally, there are two types of aggregate: (1) according to the size of aggregate, it can be divided into two types

Coarse aggregate: rock particles with particle size larger than 4.75mm, such as pebbles, crushed stones, etc;

Fine aggregate: rock particles with particle size less than 4.75mm, such as river sand, mountain sand, sea sand, etc.

(2) According to the density of aggregate, it is divided into:

Ordinary aggregate: the density is 2500-2700kg / m;

Lightweight aggregate: density is 0~1000kg/m, such as ceramsite, calcined shale, expanded vermiculite, expanded perlite, foam plastic particles and so on.

Heavy aggregate: density 3500-4000kg / m, such as iron ore, barite, etc.

With the definition and types of aggregate, let's talk about the processing technology and related production equipment of aggregate.

The whole sand production system consists of four parts:

Feeding system, conveying system, crushing system and screening system.

Feeding system: generally, vibrating feeder is used to supply stone;

Conveying system: belt conveyor or plate conveyor, etc;

Crushing system: the heart of the whole set of equipment, consisting of multiple crushers, crushing various ore raw materials into finished materials of required size, generally including jaw crusher, impact crusher, cone crusher, sand making machine, etc;

Screening system: circular vibrating screen or linear vibrating screen and other screening equipment.

The whole sand production process is as follows:

The bulk materials are sent to the jaw crusher for initial crushing by the feeder, and the crushed materials are sent to the fine crusher - impact crusher or cone crusher for secondary crushing by the conveying equipment. Then the crushed materials are transported to the screening equipment for screening, and the finished products that meet the particle size are sent to the finished product pile, and those that do not meet the requirements are sent back to the crusher for further crushing.

We can refer to these principles when designing the whole sand aggregate production process

① Multistage crushing;

② The treatment capacity is matched before and after the stage;

③ Transfer bin design;

④ The material size is matched with the front and back level;

⑤ More sieving and less breaking, more breaking and less grinding;

⑥ Determine the belt according to the output and transportation height difference;

⑦ Flexible site layout.

11 Types of Dewatering Equipments Used for Mineral Dewatering

1. Bucket Elevators

Bucket elevators are a series of hoppers fixed on the endless traction component, which can lift materials vertically and continuously. It can be divided into three types: ring chain, plate chain and belt.

Bucket elevators are commonly used in the front of the production line to transport materials. In fact, the bucket elevator can also be used for the dehydration of coarse particles, and the water flows out under the action of gravity with the rise of materials.

2. Plate and Frame Filter Press

There are 2 types of plate and frame filter press: plate and frame filter press and concave plate and frame filter press. The main difference between them is the structure of the filter chambers.

3. Belt Filter Press

Belt filter press is composed of two tensioned filter belts, which carry the sludge layer and pass through a series of regularly arranged rollers in the shape of S, depending on the tension of the filter belt itself, it forms the pressing and shearing force on the sludge layer, extrudes the capillary water in the sludge layer, and obtains the sludge cake with high solid content, so as to realize the sludge dewatering.

4. Diaphragm Filter Press

Diaphragm filter press is improved on the basis of the structure of the chamber filter press, which increases the dewatering function.

Diaphragm filter press can simultaneously carry out the primary filtration dehydration of high pressure fluid feed, the secondary extrusion dehydration of filter cake and the tertiary dehydration of filter cake blown by strong air flow of compressed air.

5. Rotary Vacuum Filter

Rotary drum vacuum filter is a kind of continuous operation filtering equipment. The main body of the equipment is a horizontal cylinder that can rotate. The surface of the cylinder is perforated metal plate or wire mesh. The mesh is covered with filter cloth. The suspension is in contact with the cylinder at cylinder bottom.

6. Centrifuge (Horizontal Screw Centrifuge)

Centrifuge is used for solid-liquid separation by centrifugal force, It is mainly used for dewatering, concentration, separation, clarification, purification and solid particle classification.

Horizontal screw centrifuge is a kind of continuous dewatering equipment, which uses centrifugal sedimentation to separate materials with different specific gravity, and can continuously feed, separate, wash and discharge materials.

7. Ceramic Vacuum Filter

Ceramic vacuum filter is a new type of efficient and energy-saving filtration equipment, which integrates electromechanical, microporous ceramic and ultrasonic technology, and realizes dewatering by means of vacuum suction and capillary action.

8. Paste Thickener

Paste thickener is a kind of continuous concentration and clarification equipment, which is suitable for concentrate and tailing dehydration of concentrator, and widely used in metallurgy, chemical industry, coal, non-metal beneficiation, environmental protection and other industries.

9. Liner Vibratory Screen

The materials are feed on the liner vibratory screen, and moves forward in a straight line at the same time. The material enters the feed port of the screens evenly from the feeder, and several specifications of upper and lower materials are generated through the multi-layer screens, and part moisture can be removed during the vibration process.

10. Dewatering screen

The main functions of dewatering screen are dewatering, desliming and desedifying, which can be used for sand washing in sand and stone plant, slime recovery in coal preparation plant, tailings dry discharge in ore dressing plant, etc

11. Mineral Dryer

Mineral dryer is generally rotary cylinder type, which is used to dry materials with certain moisture or particle size, such as iron ore, titanium ore, quartz sand and other minerals.

The dryer cylinder is a rotating cylinder slightly inclined to the horizontal line. The material is added from the higher end, and the heat carrier enters from the lower end, which is in countercurrent contact with the material.

A paddle board is installed on the inner wall of the cylinder, which is used to lift and lower the material, increase the contact surface between the material and the air flow, so as to improve the drying rate and promote the material forward.

Reprinted from: https://www.beidoou.com/mining/dewatering-equipments-for-mineral-sludge.html

Granite Sand Making Production Line

Taking granite as an example, we would like to introduce 6 aspects of site planning, process design and equipment allocation of a machine-made sand production line with an annual output of 3 million tons.

1.Raw material of artificial sand

2.Scale of production

3.Product Classification

4.Mode of production

5.Design sand making process

6.Main equipments

More details please visit the blog: M&C

How About M&C

M&C stand for mining and construction. We have been engaged in mining machinery industry for 10 years. We are full of hope and enthusiasm for this industry.

We organize and publish all kinds of information about mining machinery and construction machinery. We provide all kinds of production solutions. We recommend all kinds of equipment we know well.

……Or：

If you have any questions about mining machinery and construction machinery, you can consult us. We have good engineers who can recommend the most suitable equipments and solutions for you.

Finally, we welcome like-minded friends to submit their contributions. We will offer you a free backlink.