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Cast Iron Grinding Balls
Quick Overview

  • The Cast iron grinding ball is excellent in surface quality, toughness, and resistance to impact and abrasion. It won't crack and lose circularity quickly.

  • Grinding media is used in ball mills to pulverize or mix materials into powders

  • The forged steel grinding ball must use super wear-resistant material to ensure abrasion resistance.

  • Benefits include being able to be operated continuously and having a wide application compared to alternative rod mills.

  • Cast iron is cheaper compared to forged steel alternatives. 

  • Cast iron has less size restriction compared to forged steel due to the difference in the process.

  • Ball mills are recommended when the finished product size is required to be less than 0.5mm as they produce very fine powder and wide adaptability to materials. On the other hand, grinding rods are used if the finished product is  1 to 3mm.

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25mm, 40mm, 50mm, 60mm, 80mm, 90mm

Cast Iron Balls

Cast iron balls in grinding media are excellent in surface quality, toughness, and resistance to impact and abrasion. It won't crack and lose circularity quickly. Mainly used in ball mills to pulverize or extract raw materials. 

 How are cast grinding balls made? 

  • Raw material: cast grinding balls can be made from various elements: steel scrap, Ferrochrome, Carburant, and Precoated Sand. Our cast iron grinding balls are made from molten iron. 
  • Molding: There are two approaches to molding. One uses an automatic molding line, and the other uses a manual process. Balls are produced using metal molds, whether automatically or manually. Compared to green sand technology, it is of a higher grade.
  • Heat treatment: The metal is heated to a temperature of 1050 degrees Celsius before being cast using equipment that applies pressure to the mechanical characteristics, shape, and size of the metal. optimizing the metal's melting process and microstructure.

steel balls

What are cast iron balls used for?

         Grinding balls are used in ball mills, a type of grinder used to grind, blend, and sometimes for mixing materials. It is used to mix materials such as chemicals, paints, ceramics, ores, crushing coal, cement, and many other objects.

What is the working principle of a ball mill?

The two working principles of a ball mill is the impact and attrition size reduction, they take place as the ball drops from near the top of a rotating hollow cylindrical shell. The result of the grinding depends on the materials used, the size of the mill, and the size of the materials inside the mills.

What Are Ball Mill Balls Made Of?

Metal balls are used as the main grinding media in ball mills, which also use a spinning shell to create centrifugal force. By impact and attrition, it is a shear-force dominant approach that constantly reduces particle size. The materials used in making ball mill balls, also known as grinding media balls, can be classified into:

  • Steel balls are balls made using carbon steel to produce raw material, doped with different chemical elements to possess grinding media properties such as strength and hardness. 
  • Cast Iron Balls, these types of ball mills make use of cast iron for the production 
  • Ceramic balls, as its name suggests, this ball mill ball is made of ceramic and used mainly in small mills to produce food and chemical

What are the advantages of a ball mill?

  • Ball mills produce very fine powder (particle size less than or equal to 10 microns).
  • They are acceptable for milling toxic materials since they can be used in a completely enclosed form.
  • Ball mills have a wide application.
  • Ball mills are available for continuous operation.

steel balls

How many balls should be loaded in a ball mill for working?

         The steel ball volume in the ball mill should be less than the cylinder's horizontal line.in large ball mills, it is best to keep the ball quantity between 40 and 50 percent for better control. The percentage of steel balls in smaller ball mills should be around 35% at most. This may effectively ensure that the steel ball can fall freely, increasing the force of impact. The productivity of ball mills depends on drum diameter and the relation between drum diameter and length.

How to add grinding balls proportionately in ball mills? 

The freshly installed ball mill normally goes through a running-in procedure. The first addition of balls, which makes up 80% of the ball mill's maximum ball load, occurs during the running-in process. Why is the amount of steel balls fed to the ball mill during operation just 80%? Because the ball mill's big and little teeth need to mesh after it is installed, the handling capacity (ore volume) should be progressively raised. Stop the ball mill after two or three days of regular, uninterrupted operation to inspect the meshing state of the big and small gears. Open the ball mill's manhole cover after everything is in order, then add the final 20 percent of steel balls. 

 What is the difference and similarities between ball mill and rod mill?

Ball mills and rod mills have a similar appearance (horizontal cylindrical structure.) along with similar components and working principles. However, their differences can be analyzed in terms of performance, grinding medium, and application.

  • Differences in performance

Rod mills can be categorized into three categories based on performance: center and side discharge, end and side discharge, and shaft neck overflow discharge. As their names suggest, these different types of rod mills are distinguished by the area through which they are fed. Ball mills are, however, classified into two categories based on how they are discharged; these categories are overflow discharge ball mills and grate discharge ball mills.

  • The difference in grinding medium

Ball mills have a high degree of toughness and manufacturability due to the use of materials including high manganese steel, low carbon alloy, high carbon, and high manganese alloy. However, high carbon steel and 42 Cr Mo steel rods are used to make rods for rod mills. The diameter of this rod, which is employed as a grinding media, ranges from 50 to 100 mm.

  • Difference in application

In essence, ball mills are used for fine grinding, whereas rod mills are used for coarse grinding. Metal and non-metal ores are both ground in ball mills, which are also used in the cement, building, glass and ceramics, and chemical fertilizer industries. However, when crushing soft ores, a rod mill can be used as a fine crushing device.

Which is cheaper: cast steel or cast iron?

Due to the reduced costs of the raw materials, energy, and labor used to create a finished product, cast iron is frequently more affordable than cast steel. In addition to being more expensive to buy, raw steel takes longer and more care to cast.

steel balls

Benefits of Casting compared to Forging?

  • Forging has size limitations. Shaping metal is more difficult than forging since the process keeps the metal in a solid state, unlike casting. Since altering the metal’s shape is more difficult with forging, there’s a limit on the size and the thickness of metal for forging. In addition, casting is a wider practice in industrial use. Practically any material can be cast, and products up to 200 tons can be created.

  • Shape freedom. Using casting, you may create considerably more intricate shapes. You need access to the metal in order to forge it. But you have a lot more design flexibility with casting.in casting, molten metal flows into a cavity in a mold or die, which allows for more complex shapes to be easily produced. 

  • Composition freedom, The composition of metal may also be quickly changed by casting. Simply add some alloying components to the mixture to obtain the desired material characteristics. You work with the steel grade you have during forging.

What Is A Qualified Grinding Ball?

Grinding balls must adhere to the GBT17445-2009 which is the Chinese national standard. The surface should be ≥ 58 HRC in general. The chemical composition needs to satisfy client requirements. The surface of the grinding balls is free of cracks, inclusions, shrinking cavities, and cold shuts.

How to Measure the Performance of Cast Iron Balls?

The effectiveness of Cast iron balls is determined by calculating the efficiency of the ball mill which considers multiple factors. The power per tonne of the ball mill is determined by the ball mill fill rate. Good Steel balls will have:

  • Greater hardness
  • Greater endurance and wear resistance
  • Smooth surface
  • The low circle loss rate
  • low splintering rate.

How does the Temperature And Speed of pouring Grinding Media Balls impact The Quality Of Casting?

  • Pouring temperature

The formation of casting grinding media balls benefits from high pouring temperatures. However,It is simple to produce casting grinding media balls faults like shrinkage cavities, shrinkage depressions, surface adhering sand, and bulging if the pouring temperature is too high. 

If the temperature is too high during pouring, the cooling process will take lo. and Pits and surface layer decarbonization can occur on the surface of casting grinding media balls. In addition,  The fine grains of casting grinding media balls may become coarser and the mechanical qualities may decline if the pouring temperature is too high.

  • Pouring speed

It is beneficial for the formation of casting iron balls if the pouring speed is fast. However,  If the rate of pouring is too fast, inclusions and bubbles are more likely to occur.

When the impact force during pouring is too high, the liquid steel splashes, and the production of cold beans are easy to create. On the contrary,  The grain size of casting iron balls may get coarser and the mechanical characteristics may decline if the pouring speed is too slow.

What is single-stage or multiple-stage grinding? 

The grinding process might take place all at once or in stages. A rod mill followed by a ball mill (two-stage circuit) or a semi-autogenous grinding (SAG) mill followed by a ball mill are examples of many stages (two-stage circuit). To run a single grinding stage, smaller operations frequently install additional crushing stages. Generally, ball mills have a Large crushing ratio, easy to adjust product fineness, and create finer product particle size which would make it able to be a second-stage grinding process. 

How to test Cast Iron Balls?

Before the product is ready to sell, there is a quality inspection test that occurs. This consists of:

  • Dropping test
  • Hardness test
  • Chemical Element Analysis
  • Impact Value Test

These tests ensure that the steel ball will be efficient in the mills. The product is cleared for shipping, then it is packed in bags and loaded on a truck to be transported to its destination.

steel balls

Why should I import steel from China?

  • Steel quality, Governments from importing countries enforce extra measures to ensure the quality of imported steel, with rigorous regulations and high-quality standards an experienced manufacturer will ensure you have the best quality steel available!

  • Steel cost, high production costs, and high competition make buying steel from local suppliers to be more expensive, buying straight from manufacturers like camasteel will cut the cost due to a reduction in the supply chain.
  • Steel Availability, China is known to be the manufacturing capital of the world and is a staple for bulk purchases all over the world. With top steel production houses being based in China, buying and shipping steel cannot be easier. 

What Are Grinding Balls Used For? 

Grinding Balls are used in the grinding or blending of materials into fine powder. It can also be used to mix materials such as paints, chemicals, ores, and ceramics. 

What Is Grinding Ball Mill? 

A Grinding Ball Mall is a grinder used to blend or grind materials used in mineral processes, dressing, pyrotechnics, paints, and ceramics. They work based on the attrition and impact principle: the material sizes are reduced by impact as the balls are dropped from the top of the shell. 

A grinding Ball Mill is made up of a hollow cylindrical shell that rotates around its axis. The axis of the shell can be at a little angle to horizontal or horizontal. It is filled partially with balls. The length of a mill is approximately the same as its diameter. 

How Full Should A Ball Mill be? 

A ball mill should be half filled with grinding media for effective results. However, some operators go overboard to compensate for wear. 

What Is The Difference Between A Rod Mill And A Ball Mill? 

A rod mill and ball mill are both used in grinding materials. To get the best result, you need to know which mill is best suitable for your purposes. Herein are the difference between a rod Mill and a ball mill; 

  • Granularity and Capacity 

The capacity of a ball mill is 0.65-615t/h while the grounded material discharge particle size is 0.07-0.4mm. On the other hand, the capacity of a rod mill is 0.62-180t/h and its particle size discharge is 0.147-0.833mm. 

  • Grinding media used  

Balls make use of steel balls with diameters less than 100mm as their grinding media, and their medium filling rate is between 40 to 50%. Rod mills employ the use of steel rods as it's grinding media, they have a carbon content of 0.8-1% with a diameter of 50mm-100mm. 

  • Way Of Material Discharge 

The way of discharge of a ball mill is classified into two which are the overflow and grate discharge. The grate discharge discharges materials through a sieve plate, the materials pass quickly due to the low height of the plate. The overflow has no sieve plate and allows materials to be discharged naturally without being filtered. 

A rod Mill can discharge materials in three different ways which are the end and side discharge, overflow, and the center and side discharge. The end and side discharge are used for dry grinding and product with coarse particle sizes. The center and side discharge discharges materials through the center port of the cylinder and is used for both dry and wet grinding of materials with coarser particle sizes.  The overflow discharge is used when you need to grind a product and supply it to a ball mill, its particle size is finer than the other discharge methods. 

  • Cylinder Proportions  

Although both rod and ball mills are cylindrical and long, the ratio of the cylinder is different. The length of the cylinder to the ratio of the diameter of a ball mill is low, around 1. While the length of a rod Mill to its diameter ratio is about 1.5-2.0. 

  • Performance  

The ore of a ball mill is in point contact with its grinding media which has both grinding and impact force. It has a high production capacity and high material fineness. 

The grinding media of a ball mill is in linear contact with its ore. The product is usually rough. 

steel balls

What Is The Use Of Grinding Media? 

Grinding media are used to grind or crush materials in mills during industrial processes. They help in the reduction of particle sizes and the refining of materials. 

What Are Ball Mills Made Of? 

A ball mill is made up of a hollow cylindrical shell that rotates around its axis. The axis of the cylindrical shell is horizontal or partially horizontal. It is usually half filled with grinding balls. The grinding balls are the grinding media which are usually made of stainless steel, chrome Steel, rubber, or ceramics.

The inner surface of the cylindrical shell is mostly lined with abrasion-resistant materials such as rubber lining or manganese steel. The length of a ball mill is usually approximate to its diameter. 

How Do You Make A Ball Mill? 

A ball mill features a hollow cylindrical shell and grinding balls. The cylindrical cell has an axis which it rotates around and moves horizontally. The balls which are also known as grinding media are made of steels. Some times, grinding balls can also be made of ceramics or rubber.

How Many Balls Are In A Ball Mill? 

Ball Mills are usually filled with about 40% of balls. The balls are usually between 30 to 80mm in diameter. There is a maximum loading capacity for each ball mill. 

What Are Grinding Balls Made Of? 

Grinding balls are usually made from different materials such as hard metal, steel, and ceramic. However, the most common materials used are steel and alloy steel due to their ability to abrasion resistance and low rate of wear. 

What Are The Three Types Of Grinding Media Commonly Used In Ball Mills? 

The most commonly used grinding media in ball mills are; 

  • Porcelain Balls 

Porcelain balls are the most popularly used grinding media in ball mills. They rarely crack or chip while grinding due to their amazing density. Although they are a little bit more expensive, their durability compensates for the price 

  • Alumina Oxide Balls  

Alumina Oxide balls have gained popularity over the years due to their corrosion and abrasion-resistant ability. They are also capable of withstanding extremely high temperatures which have made them one of the most sought-after grinding media. 

  • Flint Pebbles  

Despite being one of the oldest types of grinding media, flint Pebbles are quite popular. Though they're not as durable as porcelain balls, they are compatible with almost all lining types and are quite affordable. They are also known for their low rate of contaminating materials. 

steel balls

What Balls Are Used In Ball Mills? 

They're various types of balls used in ball mills. They can be classified according to; 

  • Product material: steel, iron, ceramics, and carbide materials.
  • Production technology: hot rolling, centrifugal casting, sintering, and stamping 
  • Hardness: Higher, High, and Normal 

How Do You Make A Grinding Ball?  

The process involves in the making of grinding involves; 

  • Inspection of Reform

To make grinding balls, round bars are used. The round bar to be used should be made from high and medium carbon and low alloyed steel. Before production, the preform must be properly inspected to ensure that the reforms meet the needed chemical compositions. 

  • Heating Of Reform 

The reforms can then be heated in a furnace with the right amount of temperature to ensure accurate output. 

  • Ball Rolling 

After heating, the reform is then set in an inlet of screw gauges and rolled into balls. 

  • Heat Treatment 

After the balls are rolled, it is placed on quenching drum shelves through an inclined chute. After it has been quenched, the balls can be self-tempered after which it is fully ready for use. 

steel balls

What Is Grinding Media In Ball Mill? 

Grinding media in ball mills are how materials are ground or crushed. It is available in several forms. 

What Is The Use Of Grinding Media? 

Grinding media are used to grind or crush materials in ball mills during an industrial process. They are also used to reduce the size of particles by facilitating an interaction between the grinding media and the particle. 

What Do Grinding Balls Do? 

Grinding balls break down secondary materials such as rock, cement, and stone into fine particles. They can also be used to mix materials such as ores, ceramics, paints, and chemicals. 

Why Is Grinding Important In Mineral Processing? 

Grinding is important in mineral processing because it helps to achieve monomer dissociation between gangue minerals, useful minerals, and other minerals. Grinding also ensures that the right sizes of materials are provided for the sorting downstream. 

What Is The Difference Between Grinding And Crushing? 

Crushing is the breaking down of large particles into several pieces. The main aim of crushing is to make materials easily transportable and storable. 

Grinding is a controlled process that is used to break down particles into micron levels. Grinding is used in obtaining finer fractions of materials. 

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  1. Iron Grinding Balls review by Alisa on 6/10/2021

    Just what I was looking for. It arrived on time!

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