Ball Mill Liner - Qiming Machinery

Ball Mill Liner Manufacturer

Qiming Machinery is one of the largest ball mill liner manufacturers in China. Qiming Machinery’s ball mill liners are tailor-made and developed in close collaboration with our customers. Being the pioneer, Qiming Machinery ball mill liners are designed and produced based on the world’s largest bank of know-how and experience. As a result, they last longer, and your mill availability increases.

As a casting foundry, Qiming Machinery can supply various materials and different types to suit different working conditions and requirements. No matter which material you want, no matter which liner type you need, contact Qiming Machinery is your right choice.

Ball Mill Liners

Manganese Ball Mill Liner

Alloy Steel Ball Mill Liner

Cr-Mo Alloy Steel Ball Mill Liner

Function

Ball Mill Liner Function

The ball mill liner is used to protect the cylinder body from direct impact and friction of the grinding body and the material. At the same time, different forms of mill liner can be used to adjust the movement state of the grinding body to enhance the grinding effect of the grinding body on the material, Help to improve the grinding efficiency of the mill, increase production and reduce metal consumption.

Material

Ball Mill Liner Material Selection

Different crushed material, different working conditions need different material liners to suit. Also, the coarse grinding compartment and fine grinding compartment need different material liners.

Qiming Machinery supplies the following material to cast your ball mill liner:

Manganese Steel

The manganese content of the high manganese steel ball mill lining plate is generally 11-14%, and the carbon content is generally 0.90-1.50%, most of which are above 1.0%. At low impact loads, the hardness can reach HB300-400. At high impact loads, the hardness can reach HB500-800. Depending on the impact load, the depth of the hardened layer can reach 10-20mm. The hardened layer with high hardness can resist impact and reduce abrasive wear. High manganese steel has excellent anti-wear performance under the condition of strong impact abrasive wear, so it is often used in wear-resistant parts of mining, construction materials, thermal power, and other mechanical equipment. Under the conditions of low impact conditions, high manganese steel cannot exert the characteristics of the material because the work hardening effect is not obvious.

Chemical Composition

Name	Chemical Composition（%）
Name	C	Si	Mn	Cr	Mo	Cu	P	S
Mn14 Mill Liner	0.9-1.5	0.3-1.0	11-14	0-2.5	0-0.5	≤0.05	≤0.06	≤0.06
Mn18 Mill Liner	1.0-1.5	0.3-1.0	16-19	0-2.5	0-0.5	≤0.05	≤0.06	≤0.06

Mechanical properties and metallographic structure

Name	Surface Hardness（HB）	Impact value Ak（J/cm2）	Microstructure
Mn14 Mill Liner	≤240	≥100	A+C
Mn18 Mill Liner	≤260	≥150	A+C
C -Carbide \| Carbide A-Retained austenite \| Austenite

Product specification

Size

Hole Dia.（mm）

Liner Length（mm）

≤40

≥40

≤250

≥250

Tolerance

Chrome Alloy Steel

Chromium alloy cast iron is divided into high chromium alloy cast iron (chromium content 8-26% carbon content 2.0-3.6%), medium chromium alloy cast iron (chromium content 4-6%, carbon content 2.0-3.2%), low chromium Three types of alloy cast iron (chromium content 1-3%, carbon content 2.1-3.6%). Its remarkable feature is that the microhardness of M7C3 eutectic carbide is HV1300-1800, which is distributed in the form of a broken network and isolated on the martensite (the hardest structure in the metal matrix) matrix, reducing the cleavage effect on the matrix. Therefore, the high-chromium alloy liner has high strength, ball mill toughness, and high wear resistance, and its performance represents the highest level of current metal wear-resistant materials.

Chemical Composition

Name	Chemical Composition（%）
Name	C	Si	Mn	Cr	Mo	Cu	P	S
High Chrome Alloy Liner	2.0-3.6	0-1.0	0-2.0	8-26	≤3.0	≤1.2	≤0.06	≤0.06
Middle Chrome Alloy Liner	2.0-3.3	0-1.2	0-2.0	4-8	≤3.0	≤1.2	≤0.06	≤0.06
Low Chrome Alloy Liner	2.1-3.6	0-1.5	0-2.0	1-3	0-1.0	≤1.2	≤0.06	≤0.06

Mechanical properties and metallographic structure

Name	Surface（HRC） Ak（J/cm2）				Microstructure
High Chrome Alloy Liner		≥58		≥3.5		M+C+A
Middle Chrome Alloy Liner		≥48		≥10		M+C
Low Chrome Alloy Liner		≥45		≥15		M+C+P
M- Martensite	C – Carbide		A-Austenite		P-Pearlite

Product specification

Size

Hole Dia.（mm） Liner Length（mm）

≤40

≥40

≤250

≥250

Tolerance

Cr-Mo Alloy Steel

Qiming Machinery uses Cr-Mo alloy steel to cast ball mill liner. This material based on Australia standard, (AS2074 Standard L2B, and AS2074 Standard L2C）it’s provides superior impact and wear resistance in all semi-autogenous milling applications.

Chemical Composition

Code	Chemical Elements（%）
Code	C	Si	Mn	Cr	Mo	Cu	P	S
L2B	0.6-0.9	0.4-0.7	0.6-1.0	1.8-2.1	0.2-0.4	0.3-0.5	≤0.04	≤0.06
L2C	0.3-0.45	0.4-0.7	1.3-1.6	2.5-3.2	0.6-0.8	0.3-0.5	≤0.04	≤0.06

Physical Property & Microstructure

Code	Hardness（HB）	Ak（J/cm2）	Microstructure
L2B	325-375	≥50	P
L2C	350-400	≥75	M
M-Martensite, C-Carbide, A-Austenite, P-Pearlite

Ni-hard Steel

Ni-Hard is a white cast iron, alloyed with nickel and chromium suitable for low impact, sliding abrasion for both wet and dry applications. Ni-Hard is an extremely wear-resistant material, cast in forms and shapes which are ideal for use in abrasive and wear environments and applications.

Chemical Composition

Name	C	Si	Mn	Ni	Cr	S	P	Mo	Hardness
Ni-Hard AS2027 Gr Ni Cr 1-550	3.2-3.6	0.3-0.8	0.2-0.8	3.0-5.0	1.5-3.0	≤0.12	≤0.15	≤0.5	550-600HBN
Ni-Hard AS2027 Gr Ni Cr 2-550	2.8-3.2	0.3-0.8	0.2-0.8	3.0-5.0	1.5-3.0	≤0.12	≤0.15	≤0.5	500-550HBN
Ni-Hard AS2027 Gr Ni Cr 2-550	3.2-3.6	1.5-2.2	0.2-0.8	4.0-5.5	8.0-10.0	≤0.12	≤0.15	≤0.5	630-670HBN

White Iron Steel

White iron liner is recommended to be using at low impact working condition such as :

1. Belt conveyor liner for the Mining industry.

2. Cement plant ball mill.

3. Chemical industry ball mill.

Chemical Composition

Name	Chemical Composition(%)
Name	C	Si	Mn	Cr	Mo	Cu	P	S
White Iron Steel Liner	2.0-3.3	0-0.8	≤2.0	12-26	≤3.0	≤1.2	≤0.06	≤0.06

Physical Property & Microstructure

Name	HRC	Ak(J/cm2)	Microstructure
White Iron Steel Liner	≥58	≥3.5	M+C+A
M-Martensite C- Carbide A-Austenite

If you have a special material inquiry, please contact our engineer to service you!

Flow Chart

Ball Mill Liner Flow Chart

Flow Chart

Qiming Machinery chooses sand casting to cast ball mill liner. Its flow charts as following steps:

Pattern making. After confirmed your orders, we will start to manufacture new wood or steel patterns. If we have the inquiry patterns, no need to manufacture a new pattern.
Pattern painting and flask molding.
Choose the right raw material. Our manganese steel raw material is 65Mn. Our engineer will calculate the raw material ratio based on customer material inquiry.
Bottom pour ladle casting.
Cooling, Moulding box open, and sand conditioning.
Cleaning.
Heat treatment. We will record all the heat treatment temperature line to match the standard heat treatment.
Polishing, Machining, QA Checking.
Painting and Shipping.

Types

Ball Mill Liner Types

Based on the use area, it can be divided into:

Body mill liner
Door mill liner
Special mill liner

Based on the material, it can be divided into:

Metal liner
Rubber mill liner
Mixing mill liner

Shapes

Ball Mill Liner Shapes

The shape of the ball mill liner is divided into 9 shapes according to different needs:

Ball mill liners shape

a. Wedge Shape
b. Wave Shape
c. Flat Convex Shaped
d. Flat Shape
e. Step Shape
f. Strip Shape
g. Rudder Shape
h. K-shaped Rubber liner
i. B-shaped Rubber liner

Installation

Ball Mill Liner Installation Requirements

After the mill liner is installed, the end lining plate and the cylinder end cover should be filled with compressive strength grade 43.5MPa cement mortar.
The bolts fixing the end liner shall not allow the cement mortar to suffice, but shall be able to rotate or enter and exit.
The ball mill lining is generally directional, you must pay attention to it during installation, do not reverse.
The arc length of all circumferential slits shall not exceed 310mm, and the excess shall be wedged with steel plates to isolate it.
The gap between adjacent liners is not more than 3~9mm.
The interlayer should be laid according to the design requirements between the liner and the inner surface of the cylinder. If there is no requirement, the cement mortar with a compressive strength of 42.5MPa can be filled between the two. After the cement mortar has set, tighten the liner bolts again.
When installing the liner with rubber pads, open the coiled rubber sheet 3 to 4 weeks before installation to allow it to stretch freely; when using the rubber sheet, the long side of the rubber sheet should follow the axial direction of the cylinder, The short side follows the circumference of the cylinder.
Carefully check the liner bolt holes and the geometry of the liner bolts, and carefully clean the flash holes, burrs, and protrusions on the liner bolt holes and the liner bolts so that the bolts can penetrate freely into the required position.
The complete set of liner bolts should consist of glaring bolts, dust washers, flat washers, spring washers, and nuts; in order to prevent ash leakage, you must not forget to use dust pads during use.
When tightening the lining bolts, a torque wrench should be used for the operation. Lining bolts of different specifications should be tightened according to the corresponding tightening torque requirements.

Ball Mill Liner Installation

Before installing the ball mill liners, you should know how many pcs old mill liners need to exchange.
Ask an expert to arrange and coordinate the entire replacement process. All exchange need based on work drawings.
It is necessary to circulate the remaining pulp in the ball mill as much as possible, remove the rubber pad of the waste liner, clean the protruding point of the wall of the ball mill, and remove dust and descale the cylinder. When cleaning the work, it is necessary to fix the barrel of the ball mill. The workshop needs to have good ventilation conditions and suitable temperature. Then the installer can enter the ball mill barrel to start the operation.
When removing the old ball mill liner, first remove the used lining screws, then remove the old ball mill liner one line after one line, and then lift the used ball mill liner. When removing the liner, the person should pay attention to safety and pay attention to the standing position to avoid being injured by the ball mill liner.
The new liner of the ball mill should be installed to ensure that the gap during the period is within the required range. Fix the spiral of the ball mill liner. Carefully seal the packing and gasket to prevent leakage of mineral powder. If there is no gasket, it should be wrapped around the corresponding position. Two rounds of cotton cord or hemp plus lead oil. At the same time, it is necessary to apply a layer of cement mortar on the inner wall of the cylinder and screw it tightly before solidification. It should be noted that the thin end of the step liner should be consistent with the direction of the arrow in the direction of rotation of the mill.
After the replacement, the ball mill staff needs to confirm that there is no person, no working tools, and other needless things in the cylinder, and it is necessary to carefully check the inside and outside of the cylinder before closing the empty cover.

Reports

After finish the customer’s orders, we will supply the full reports. The following is a report for our customer alloy steel ball mill liner: