H&G finish the production of SAG Mill Liner for gold mining clients in Russia

Home > News > Industry News > H&G finish the production of SAG Mill Liner for gold mining clients in Russia

NEWS & EVENTS

H&G just finished the production of high manganese steel mill liners for one NHI MZS5518 SAG mill for one gold mining clients in Russia, these mill liners will be sent by Train to Taksimo on Sep. 06th.

H&G producing different mill liners:

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.

H&G 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

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	Hardness HRC	Microstructure
High Chrome Alloy Liner	≥58	M+C+A
Middle Chrome Alloy Liner	≥48	M+C
Low Chrome Alloy Liner	≥45	M+C+P

M- Martensite C – Carbide A-Austenite P-Pearlite

Cr-Mo Alloy Steel

H&G 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(%)

White Iron Steel Liner

2.0-3.3

0-0.8

≤2.0

12-26

≤3.0

≤1.2

≤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

Autogenous mill is a new type of grinding equipment with both crushing and grinding functions. It uses the grinding material itself as the medium, through the mutual impact and grinding effect to achieve comminution. The semi-autogenous mill is to add a small number of steel balls into the autogenous mill, its processing capacity can be increased by 10% – 30%, the energy consumption per unit product can be reduced by 10% – 20%, but the liner wear is relatively increased by 15%, and the product fineness is coarser. As a key part of the semi-autogenous mill, the shell liners of the cylinder body is damaged seriously due to the impact of the steel ball lifted by the liner lifting beam on the liner at the other end during the operation of the SAG mill.

In 2009, two new semi-autogenous mills with a diameter of 7.53 × 4.27 were built in Panzhihua Iron and Steel Co., Ltd., with an annual design capacity of 2 million tons/set. In 2011, a new semi-autogenous mill with a diameter of 9.15 × 5.03 was built in Baima concentrator of Panzhihua Iron and Steel Co., Ltd., with an annual design capacity of 5 million tons. Since the trial operation of the semi-autogenous mill with a diameter of 9.15 × 5.03, the shell liners and grid plate of the mill often break, and the operation rate is only 55%, which seriously affects the production and efficiency.

The 9.15 m semi-autogenous mill in Baima mine of Panzhihua Iron and Steel Group has used the cylinder liner produced by many manufacturers. The longest service life is less than 3 months, and the shortest life is only one week, which leads to the low efficiency of the semi-autogenous mill and the greatly increased production cost. H&G Machinery Co., Ltd went deep into the site of 9.15 m semi autogenous mill for continuous investigation and test. Through the optimization of casting material, casting process, and heat treatment process, the service life of the shell liners produced in Baima mine has exceeded 4 months, and the effect is obvious.

Cause analysis of short life of SAG mill shell liners

The parameters and structure of φ 9.15 × 5.03 semi-autogenous mill in Baima concentrator. Table 1 is the parameter table:

PRODUCTS

Wear PartsRubber & Polyurethane PartsMachine Spare Parts

Quick navigation

Home About Us PRODUCTS Factory Equipment News Contact Us

WhatsApp : +86 13122362916

Mail us：nick@xzhuagang.com

Add：Liubang Industry Park, Xuzhou city, Jiangsu Province, PR.China