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Product Introduction
>Product Introduction
Grinding media is a kind of carrier be used in ball mill / SAG mill / Tower mill in industries of Mining /Cement / Coal-fired power plant etc, to help grinding & mill ore materials. grinding media shape most are balls, cylpebs (cylinder）, rods and other special shapes. The materials for making such grinding media mostly are Alloy steel, manufacturing process one is casting with alloy material of high chrome (10-16% Cr) , high chrome plus (17-22% Cr), high chrome ultra (23-28% Cr) and low chrome (1-8% Cr), another one is Forged (hot-rolled) with B2/ B3/ BU/B6 alloy steel.
>Product Advantage
1.Lower consumption cost
Because the high chrome grinding ball have higher hardness, and can be make with different content of Chromium (10-28%), so this kind grinding media comsumtions will be only 25%-65% as forged steel & lower chrome casting ball which be used to Ball mill & Tower mill. For some special mineral which have highest hardness such as Quartz sand, choose high chrome ultra (Cr: 23-28%) casting steel ball, the grinding media consumption cost will be much few than other kinds grinding media.
2.Higher hardness
High Chromium casting ball with special heat treatment processing (Oil quench & annealing), will have higher hardness than Forged grinding ball. 10% Cr- Chromium casting ball, ball diameter size Φ10 - Φ70 mm, grinding ball hardness can be HRC 66, much higher than Forging ball and Low chrome steel ball. And ball surface & core hardness difference less than HRC 1.
3.Customized alloy Steel composition
NGZR foundry can be followed customer’s requirement to readjust the Chemical Composition of Chromium alloy content (1.0-28%) and other metallic element , with special heat-treatment processing, that can make this casting steel ball got different thechnical paramenters, such as hardness / Impact Value / Breakage and de-shaping rate / micro- structure / high PH degree of acid or alkali resistant / high temperature resistance etc, to match customer’s diffent required.
4.Customized grinding media shape
NGZR can develop and make different shape of grinding media as: Grinding ball (Sphere) / Grinding cylpebs ( Cylinder) / Grinding egg ( Ellipsoid) / Polyhedron Shape and other special customized shape. Different shape grinding media will have better grinding effect with different grinding conditions
5.lower breakage & out-of-roundness rate
Depend oncontrolling raw material quality / advanced casting production equipment & special heat-treatment processing, The high chromium casting grinding ball product of NGZR have good Physical Property, large size casting ball breakage & Out-of-roundness rate will less than 1%; Small size casting ball breakage & Out-of-roundness rate will less than 0.5%
Technical Parameters
>Technical Parameters
Alloy Chemical Composition: | ||||||||||
Cast grinding ball Name | Item | Chemical Composition ( % ) | ||||||||
C | Si | Mn | Cr | Mo | Cu | Ni | P | S | ||
High Chrome Ultra | ZQCr23 | 2.1-3.3 | ≤1.2 | 0.2-1.5 | 23 - 30 | ≤1.0 | ≤1.0 | ≤1.0 | ≤0.06 | ≤0.06 |
High Chrome Plus | ZQCr18 | 2.1-3.5 | ≤1.2 | 0.2-1.5 | 18 - 23 | ≤1.0 | ≤1.0 | ≤1.0 | ≤0.06 | ≤0.06 |
High Chrome | ZQCr10 | 2.1-3.6 | ≤1.2 | 0.2-1.5 | 10 - 15 | ≤1.0 | ≤1.0 | ≤1.0 | ≤0.06 | ≤0.06 |
Middle Chrome | ZQCr 5 | 2.1-3.6 | ≤1.5 | 0.2-1.5 | 4.0-6.0 | ≤1.0 | ≤0.8 | - | ≤0.08 | ≤0.08 |
Low Chrome | ZQCr 1 | 2.1-3.6 | ≤1.5 | 0.2-1.5 | 1.0-3.0 | ≤1.0 | ≤0.8 | - | ≤0.10 | ≤0.10 |
Product Physical Technical: | ||||||
Cast grinding ball Name | Item | Physical Technical | ||||
Surface Hardness | Breakage Rate | Impact fatigue Falling ball times | Impact Value ( J /cm2 ) | Micro- structure | ||
High Chrome Ultra | ZQCr23 | HRC ≥ 62 | ≤ 1.0 % | ≥ 15000 | ≥ 3.0 | M +C |
High Chrome Plus | ZQCr18 | HRC ≥ 60 | ≤ 1.0 % | ≥ 15000 | ≥ 3.0 | M +C |
High Chrome | ZQCr10 | HRC ≥ 58 | ≤ 1.0 % | ≥ 15000 | ≥ 3.0 | M +C |
Middle Chrome | ZQCr 5 | HRC ≥ 47 | ≤ 2.0 % | ≥ 8000 | ≥ 2.0 | P +C |
Low Chrome | ZQCr 1 | HRC ≥ 45 | ≤ 2.0 % | ≥ 8000 | ≥1.6 | P +C |
Remark: M= Martensite ; C= Carbide ; P= Pearlite ; AF= Acicular Ferrite ; GJS= spheroidal graphite | ||||||
Existing Product Size & Tolerance: | ||||||
Product Size Φ（mm） | Φ6 / Φ8 /Φ10 Φ12.5/ Φ15/ Φ17.5 /Φ20 / Φ25/ Φ30 | Φ40 / Φ50 /Φ60 | Φ70 / Φ80 | Φ90 / Φ100 | Φ110 / Φ120 | Φ125/Φ130/ Φ140 /Φ150 |
Diameter Tolerance | + 1.0 mm - 1.0 mm | + 1.5 mm - 1.0 mm | + 2.0 mm - 1.0 mm | + 2.5 mm - 1.0 mm | + 3.0 mm - 1.0 mm | + 3.5 mm - 2.0 mm |
Remark: NGZR can customized any ball size from Φ6 to Φ150 mm by casting ; | ||||||
| Product Weigth : | ||||||||
Size (mm) | Φ20 | Φ25 | Φ30 | Φ40 | Φ50 | Φ60 | Φ70 | Φ80 |
Weight (kg /pcs) | 0.034 | 0.063 | 0.11 | 0.26 | 0.51 | 0.86 | 1.37 | 2.05 |
Q’ty (pcs) per mt | 31506 | 15873 | 9091 | 3891 | 2000 | 1153 | 729 | 487 |
Size (mm) | Φ90 | Φ100 | Φ110 | Φ120 | Φ125 | Φ130 | Φ160 | |
Weight (kg/pcs) | 2.9 | 4.0 | 5.3 | 6.8 | 7.75 | 8.74 | 13.5 | |
Q’ty (pcs) per mt | 345 | 250 | 188 | 147 | 129 | 114 | 74 | |
Product Uses
>Product Application
High chromium casting grinding ball is a consumable grinding media, be used to mill & grinding raw material such as mineral ore block to powder by equipment of Ball mill / SAG mill / AG mill/ Tower mill / Roller mill / Vertical mill , The application industries as:
1.Mining
Wildly used to mineral processing for Iron mine/ Copper mine /Gold mine Sliver mine/ Lead-Zinc mine / Bauxite mine/ Nickel mine / Manganese mine / Chromium mine / Lithium carbonate mine / Graphite mine / Fluoride mine /Quartz mine etc.
2.Cement
Be used to grinding the cement raw materials ( Limestone / Clay/ Iron ore or Steel slag / Coal ore etc) and cement clinker by Ball mill & Roller machine. High chromium grinding media is the best choice for cement plant because the media consumption is very less.
3.Coal-fired power plant
Be used to grinding coal ore of power plant raw material by Ball mill or Roller mill.
4.Concrete & Construction material
AAC (Autoclaved aerated concrete brick) plant used to grinding raw material : sand / Coal ash;
PHC (pre-stressed high-strength concrete) tubular pile plant used to to grinding raw material ;
5.Other Industry
High chromium grinding ball can be used to Chemical industry / Pharmaceutical industry / Food industry / Fertilizer industry etc.
>Product Uses
How to select right type /size and quantity of grinding media?
1.Follow the mill size
In general, The mill machine have larger diameter size , input raw ore with larger size and get higher grinding efficiency, need to select large size grinding ball. When the mill diameter size more than 6 meters, the grinding ball breakage rate will be higher, that should be selecting the grinding ball with high toughness, that need your grinding media supplier make special manufacturing for you.
2.Follow the type of mineral and input & output raw ore size
In mineral processing plant, one stage grinding used large size grinding ball, the secondary fine grinding used small size grinding ball or cylpebs, choose high chrome grinding media will get less wear cost and high grinding efficiency.
In cement plant, The first chamber of cement ball mill used large size high chrome grinding media, and the second chamber will used small size high chrome grinding cylinder.
3.First installation loading grindng media size proportioning
Ball mill first installation , grinding ball quantity should be 35-45% of whole ball mill loading weight, to Follow mill speed / input mineral size /output size and grinding efficiency to adjust grinding media loading weight. First installation will loading 3-5 different size grinding ball, and middle size ball quantity should me more than 50%, thereafter, add large size ball quantity follow the grind media consumption.
Product Processing Video
>Product Processing Video
FAQ
>FAQ
How to require a quotation ?
Please send details of your requirement to us by E-mail, we will send quotation to you within 3 working days.
How to require a free sample ?
Please send your sample requirement to us，we will check and confirmed to you within 3 days. Sample quantity less than 3 pcs can be free, but sample express charge & tax fee should be by Freight Collect.
What is your MOQ ?
This high chrome grinding ball MOQ is 1 tons per each size, 20 tons per each shipment; In order to save the export & transport & shipping charge, each shipment quantiy more than 100 tons will be better.
What is your order Lead-time ?
Order Quantity less than 200 mt, the lead-time is 20-30 days after order deposit;
Order Quantity is 200-1000 mt, the first 500 mt need 30-45 days, balance will be 45-60 days;
Order Quantity is 1000-10000 mt, first 500 mt need 30 days, balance will be 2000 mt each month;
What is your export product package ? How to transport ?
Our product export package is ton bag (1 t or 2 t）or metal drum (0.8-1 t), 2 tons on one wooden pallet. For oversea customer, we will shipping with container ( 20 feet container loading 20-25 mt) , or transport by train with container.
What is your payment term ?
With different price & quantity of contract, We accept different payment term as below:
1. 30% T/T in advance, balance T/T before shipment ( Quantiy less than 500 tons);
2. 20% T/T in advance, balance O/A 30-60 days ( Quantiy 500-5,000 tons);
3. 10% T/T in advance, balance O/A 60-180 days ( Quantiy more than 5,000 tons);
What is your price term ? How to loading cargoes?
We can do price term as below:
EXW factory, including VAT tax, Loading cargoes in our factory ( Ningguo city, Anhui );
FOB Shanghai / Ningbo Port, Container loading cargoes in our factory;
CIF Port of delivery, Shipping with container by sea;
DAP place of delivery; Transport with container by sea & by train;
