20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding
Product Specifications
- model
Contact Supplier
Still deciding? Get samples of $ !
Request Sample
Product Highlights
- Engineered for Copper Flotation Circuits - B2 grade (Cr 0.20-0.60%) helps reduce free iron dissolution in copper ore slurries, protecting collector efficiency and supporting stable copper recovery.
- Sphericity is maintained throughout the wear cycle, with reduced risk of flat spots and irregular geometry.
- Crushing Rate Below 1% - No Fragment Contamination. Impact toughness >=12 J/cm2. Ball fragments in a copper flotation circuit coat mineral surfaces and suppress recovery. Verified by 8-meter drop test
- Full-Section Hardness: HRC 61-66 Surface, HRC 59-65 Core -<=3 HRC surface-to-core difference. Consistent hardness ensures predictable wear geometry and stable P80 targets throughout the grinding camp
- Secondary Grinding 40-80 mm | Regrind 20-40 mm - B2 grinding balls for copper ore secondary grinding and concentrate regrinding.
Product Attributes
- Customization
- Available
- Material
- B2
- Content
- Alloy Steel
- Model NO.
- 20-80 mm Forged Steel Ball
- Usage
- Grind, Copper Ore Secondary Grinding and Regrinding
- Processing Type
- Forged and Hot Rolled
- Size
- 20-80 mm
- Color
- Black
- Customized
- Customized
- Product Name
- Forged Steel Ball
- Surface Hardness
- 61-66 HRC
- Core Hardness
- 59-65 HRC
- Packaging Details
- Iron Drum/Ton Bag
- Standard
- ISO 9001;ISO 14001;ISO 45001
- Transport
- by Sea
- Application 1
- Copper Ore Grinding
- Application 2
- Copper Ore Secondary Grinding
- Application 3
- Copper Ore Fine Grinding
- Application 4
- Copper Ore Secondary Grinding and Concentrate Regr
- Transport Package
- Drum/Ton Bag
- Specification
- 20-80 mm
- Trademark
- JUNDA
- Origin
- China
- HS Code
- 7326110000
- Production Capacity
- 100, 000 Tons/Year
- Package Size
- 75.00cm * 75.00cm * 70.00cm
- Package Gross Weight
- 1002.000kg
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
Product Images of 20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding
-
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding -
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding
Find Similar Products
Product Description
20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding
update:August 20th, 2026
Our B2 forged steel grinding balls are specially designed for secondary grinding of copper ore and copper concentrate regrinding in modern mineral processing plants.
Manufactured from premium B2 alloy steel and processed through precision forging and advanced heat treatment, the grinding balls provide outstanding wear resistance, impact toughness and dimensional stability.
Compared with ordinary forged balls, B2 grinding media deliver longer service life, lower ball consumption and improved grinding efficiency in copper beneficiation circuits.
Suitable for:
Copper ore secondary ball mills
Copper concentrate regrinding mills
Closed-circuit grinding systems
Fine grinding before flotation
Mineral processing plants
| Product Attributes | |
| Field | Value |
| Product Name | B2 Forged Steel Grinding Ball for Copper Ore Regrinding |
| Material | B2 (Cr 0.2-0.6%) |
| Size Range | Ø20 mm to Ø80 mm |
| Surface Hardness | 61-66 HRC |
| Core Hardness | 59-65 HRC |
| Impact Toughness | ≥12 J/cm² |
| Crushing Rate | <1% |
| Application | Copper Ore Secondary Grinding, Copper Concentrate Regrinding, Flotation Feed Preparation |
| Processing Type | Forged and Hot Rolled |
| Standard | ISO 9001:2015, GB/T 17445 |
| Packaging | 1,000 kg Iron Drum / Ton Bag |
| Production Capacity | 100,000 Tons/Year |
| HS Code | 7326110000 |
| Lead Time | 14 Working Days (Standard) |
| MOQ | 500 kg per combined order; mixed sizes are available with a minimum of 200 kg per size. |
Product Overview
Copper ore processing involves two distinct grinding stages that place different demands on grinding media:4.1 Secondary Ball Milling
Reduces primary mill discharge (typically P80 150-250 μm) to flotation feed (P80 75-150 μm). Ball charge: Ø40-80 mm. The primary requirement is hardness uniformity - a soft-core ball accelerates wear in its second half of service, shifting P80 targets and destabilizing flotation feed quality.4.2 Concentrate Regrind Milling
Rougher and cleaner concentrates are reground to liberation size (P80 20-45 μm) before final cleaning flotation. Ball charge: Ø20-40 mm. Irregular ball geometry disrupts slurry rheology in tower mills; free iron from media wear reacts with xanthate collectors, reducing copper recovery by 0.5-2% in sensitive circuits.Jinan Junda's B2 forged grinding balls address both stages: controlled Cr content (0.2-0.6%) passivates the ball surface; forged construction ensures stable sphericity and density; HRC 61-66 surface hardness with ≤3 HRC core differential maintains consistent grinding performance through the full ball charge life.
Running a copper regrind circuit?
Share your P80 target and mill diameter - we'll recommend the optimal B2 ball size distribution at no charge.
[ Talk to a Grinding Specialist ]
Grade Selection - B2 vs. Alternatives
| Property | B2 Value | Benefit in Copper Processing |
| Cr content | 0.2-0.6% | Reduces free Fe²+ release vs. plain carbon steel; protects xanthate collectors |
| Surface HRC | 62-65 | Sufficient wear resistance for abrasive copper sulphide ores |
| Core HRC | 60-63 | ≤3 HRC differential - no soft-core acceleration in late wear stage |
| Impact toughness | ≥12 J/cm² | Eliminates ball fracture; no fragments fouling flotation cells |
| Sphericity retention | High (forged) | Maintains slurry flow dynamics in regrind mills and tower mills |
vs. Plain carbon steel (C45): B2 releases significantly less free Fe²+, reducing xanthate consumption and improving flotation selectivity.
vs. B3 (Cr 0.7-1.2%): B3 recommended if circuit pH < 7 or Bond Ai > 0.5 g/rev. For standard copper circuits (pH 7-9), B2 is the cost-optimised specification.
Technical Parameters
| Size & Hardness Data | |||||||
| Size (mm) | Inch | Weight (kg) | Tol. (mm) | Grade | Surface HRC | Core HRC | Recommended Stage |
| Ø20 | 3/4" | 0.037±0.005 | ±1 | B2 | 63-66 | 62-65 | Concentrate regrind |
| Ø25 | 1" | 0.072±0.010 | ±1 | B2 | 63-66 | 62-65 | Concentrate regrind |
| Ø30 | 1-1/4" | 0.130±0.020 | ±1 | B2 | 63-66 | 62-65 | Concentrate regrind |
| Ø40 | 1-1/2" | 0.300±0.040 | ±1 | B2 | 62-66 | 62-65 | Regrind / Secondary |
| Ø50 | 2" | 0.600±0.050 | ±1.5 | B2 | 62-65 | 61-64 | Secondary grinding |
| Ø60 | 2-1/2" | 1.000±0.050 | ±1.5 | B2 | 62-65 | 60-62 | Secondary grinding |
| Ø65 | 2-1/2" | 1.300±0.050 | ±1.5 | B2 | 61-64 | 60-62 | Secondary grinding |
| Ø80 | 3" | 2.100±0.060 | ±2 | B2 | 61-63 | 59-62 | Secondary grinding |
| Chemical Composition - B2 Grade | |||||
| C% | Si% | Mn% | Cr% | P% | S% |
| 0.72-1.03 | 0.15-0.35 | 0.30-1.20 | 0.2-0.6 | ≤0.035 | ≤0.035 |
Application Scenarios
Second-Stage Ball Mill (Ø40-80mm B2)
After primary SAG or rod mill discharge, copper ore enters second-stage ball mills targeting flotation feed at P80 75-150 μm. Consistent B2 hardness distribution maintains stable mill power draw and predictable wear rates, reducing unplanned ball charge top-ups that disrupt flotation stability.Typical operation: wet grinding, pH 7-9, copper sulphide ore (chalcopyrite, bornite), medium abrasion index.
Copper Concentrate Regrind Mill (Ø20-40mm B2)
Rougher and cleaner concentrates are reground to P80 20-45 μm in tower mills, Isa Mills, or conventional ball mills before final cleaning flotation.- Sphericity matters: non-spherical balls create dead zones in fluidized media beds, reducing grinding efficiency and increasing specific energy consumption per tonne.
- Iron contamination is critical: free iron from media dissolution reacts with xanthate collectors. B2's Cr content minimizes iron dissolution under typical regrind circuit pH 7.5-9.5.
| Ball Size Selection Guide | |||
| Circuit Stage | Target P80 | Recommended Size | Grade |
| Concentrate regrind (tower mill) | 20-45 μm | Ø20-30 mm | B2 |
| Fine secondary grinding | 75-106 μm | Ø40-60 mm | B2 |
| Coarse secondary grinding | 106-150 μm | Ø60-80 mm | B2 |
Running a copper regrind circuit?
Share your P80 target and mill diameter - we'll recommend the optimal B2 ball size distribution at no charge.
[ Talk to a Grinding Specialist ]
About the Supplier
This supplier has been audited by BV. Verify the report on the official BV website with ID "MIC-ASR255938". Items marked "
" are certified.
){kind=link}
Company Profile
JINAN JUNDA INDUSTRIAL TECHNOLOGY was established in 2005. We are a professional manufacturer and exporter of Forged Steel Balls, Cast Steel Balls, Steel Rods, Chrome Steel Balls, Carbon Steel Balls, Stainless Steel Balls, Garnet Sand, Steel Shot, Steel Grit, Bearing Steel Grit, Glass Beads, and other surface treatment abrasives.
Regarding garnet sand, we integrate mining, production, and sales, with adequate reserves. In recent years, our garnet sand production capacity has increased from thousands of tons to tens of thousands of tons. We have built a good reputation in the garnet industry worldwide.
Regarding steel shot, steel grit, and bearing steel grit, our products meet American SAE standards and are widely used in shipbuilding, molding, steel production, automobile manufacturing, container manufacturing, machinery manufacturing, pipeline anti-corrosion, aviation, granite cutting, and other industries.
Regarding glass beads, we can produce different types of road-marking glass beads, sandblasting glass beads, and grinding glass beads according to customers' specific requirements and relevant standards, including European Standards EN 1423 and EN 1424; American Standard AASHTO M247 Types 1 and 2; British Standard BS 6088 Classes A and B; Japanese Standard JIS R3301; And Korean Standard KSL 2521 Nos. 1 and 2.
Our philosophy is to build sustainable growth on a foundation of high quality and excellent customer service. We manufacture our products in accordance with ISO quality standards and provide in-depth application knowledge and professional technical support. Highly efficient logistics are central to our company culture, and JINAN JUNDA INDUSTRIAL strictly controls materials from source to production to ensure quality and consistency. Our products are exported to the USA, Germany, Japan, and more than 90 countries worldwide.
We welcome your inquiries about our current products and opportunities for new applications and cooperation.
About Our Factory & Business Background
- Address
- OUYA DAGUAN Shizhong District, Jinan, Shandong, China
- Terms of Payment
- T/T, LC, Western Union, D/P
- International Commercial Terms(Incoterms)
- FOB, EXW, CIF, FAS, DDP
- Average Lead Time
-
Peak Season Lead Time: within 15 workdays
Off Season Lead Time: within 15 workdays - Nearest Port
- Qing Dao
Our Production Capability & Technical Expertise
Our Industry Experience & Global Business Record
- Main Markets
- North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
FAQ
- Why B2, not plain carbon steel or B3?
- B2 (Cr 0.2-0.6%) reduces free iron dissolution by ~30-50% vs. C45,protecting xanthate collectors and copper recovery. HRC 62-65 is sufficient for standard copper sulphide circuits (pH 7-9) without B3's alloy premium. Upgrade to B3 only if pH < 7 or Bond Ai > 0.5 g/rev.
- Why does sphericity matter in regrind circuits?
- Tower mills and Isa Mills run a fluidized media bed - deformed balls create dead zones, cut contact efficiency, and raise kWh/t. Forged construction eliminates internal porosity, so balls stay near-spherical through their full wear cycle. Cast media develops flat spots.
- What is the verified breakage rate?
- Below 1%. Tested by 8-meter drop test, 20,000+ cycles per production batch. Drop test records and hardness certificates ship with every order.
- Can 25 mm forged steel grinding balls be used for copper regrinding?
- Yes. 25 mm grinding balls can be suitable for selected copper ore regrinding and fine grinding applications, depending on the feed size, target particle size and mill operating conditions.
- Can I combine sizes in one shipment?
- Yes, minimum 200 kg per size, 500 kg combined. Example: 40% 25 mm + 40% 40 mm + 20% 60 mm in one 20' FCL from Qingdao.
- MOQ and lead time?
- MOQ 500 kg. Lead time 14 working days for stock sizes (20-80 mm B2). Monthly scheduled supply available for operating concentrators.
- How does grinding ball hardness affect copper regrinding?
- Higher hardness can improve abrasive wear resistance, while sufficient toughness helps resist impact-related cracking and breakage. A suitable balance between hardness and toughness is important for continuous grinding.
- What affects grinding media consumption in copper regrinding?
- Media consumption is affected by ore hardness, abrasiveness, feed size, mill operating conditions, grinding media size, material grade, hardness and grinding efficiency.
- Can forged steel grinding balls improve copper mineral liberation?
- Grinding media do not directly determine mineral liberation. However, properly selected grinding media can support the target particle size required for liberation, depending on the ore characteristics and overall grinding circuit design.
- What information should I provide when selecting grinding balls?
- Please provide the mill type, feed size, target particle size, ore hardness, ore abrasiveness, current grinding media size and grade, and grinding media consumption if available.
- Can JUNDA supply customized grinding ball sizes?
- Yes. JUNDA can supply different grinding ball diameters and material grades according to customer requirements, mill conditions and agreed technical specifications.
Send your message to this supplier
People who viewed this also viewed
-
-
US$400.00-580.00 / Ton
-
-
-
-
-
-
-
-
US$0.45-0.55 / kg
Product Groups
- Forged Steel Ball
- Abrasive Blasting Media
- Sandblasting equipment
- Stainless steel ball
- carbon steel ball
- Chrome Steel Ball
- Cast steel ball
- Steel Rod
- Silicon series
- Sandblasting parts(sandblasting nozzle &sandblasting gun)
- Sandblasting Protection Equipment(sandblasting helmet&hood)
- Road marking machine
Find Similar Products By Category
- Supplier Homepage
- Products
- Forged Steel Ball
- B2 B3 Forged Steel Ball
- 20-80 mm B2 Forged Steel Grinding Balls for Copper Ore Secondary Grinding and Concentrate Regrinding
Related Categories
Hot Searches
- Grinding Tool Factories
- Grinding Stone Factories
- Grinding Polishing Factories
- Diamond Grinding Factories
- Steel Ball For Grinding
- Steel Grinding Media
- Ball As Grinding Media
- Grinding Cast Steel Balls
- Steel Ball For Grinding Mill
- Forged Steel Ball Bulkbuy