- To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
- Use Add New Topic to ask a New Question/Discussion about Grinding.
- OR Select a Topic that Interests you.
- Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. - Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.
4
REPLIES
4917
VIEWS
Started by Babacata
Could someone please provide me a link or probably send a copy of Moly-Cop Tools 3.0 software? It's not listed on their site anymore. Thanks.
Could someone please provide me a link or probably send a copy of Moly-Cop Tools 3.0 software? It's not listed on their site anymore. Thanks.
1
REPLY
1299
VIEWS
Started by akfury
Running this dirt in any gravity separation I've tried induces packing/plugging and gold loss. All kinds of sluice setups & centrifuge. Centrifuge struggles and is too little production. Looking at Hydrocyclone for results? Problem areas are mainly 3...
Running this dirt in any gravity separation I've tried induces packing/plugging and gold loss. All kinds of sluice setups & centrifuge. Centrifuge struggles and is too little production. Looking at Hydrocyclone for results? Problem areas are mainly 3...
2
REPLIES
3149
VIEWS
Started by ManUtd67
Interested in opinion on whether to install a pre-leach thickener ahead of a gold leach circuit or operate cyclone at higher density. Option 1 - Cyclone O/F at 35% solids, P80 75um. Thicken to 65% solids and dilute with tails thickener O/F (cyanid...
Interested in opinion on whether to install a pre-leach thickener ahead of a gold leach circuit or operate cyclone at higher density. Option 1 - Cyclone O/F at 35% solids, P80 75um. Thicken to 65% solids and dilute with tails thickener O/F (cyanid...
Last replied to by rob riggir
Hi, It is better to go with the preleach thickener as long as you have the project life to get payback. You will then be able to operate your mills and cyclones at optimal densities and increase tan...
Hi, It is better to go with the preleach thickener as long as you have the project life to get payback. You will then be able to operate your mills and cyclones at optimal densities and increase tan...
4
REPLIES
1868
VIEWS
Started by MSKabir
After perusing through research articles I found out that the two most commonly used mill liners are pearlitic steel and white cast irons. However, I was wondering, what situations would involve using pearlitic steel as liner material or vice versa d...
After perusing through research articles I found out that the two most commonly used mill liners are pearlitic steel and white cast irons. However, I was wondering, what situations would involve using pearlitic steel as liner material or vice versa d...
1
REPLY
1487
VIEWS
Started by Azadeh
I try to size and select two ball mills, which the first is in open circuit with feed rate of 125 t/h and its discharge goes to the sump of hydrocyclone and together with discharge of second ball mill, enters to the cyclone for classification. the se...
I try to size and select two ball mills, which the first is in open circuit with feed rate of 125 t/h and its discharge goes to the sump of hydrocyclone and together with discharge of second ball mill, enters to the cyclone for classification. the se...
Last replied to by Mike
Simple answer: yes 125 x 2.5 = 312.5. In actual fact you need to to consider the size distribution of the new feed going to the mill, the grind characteristics of the new feed, the performance of ...
Simple answer: yes 125 x 2.5 = 312.5. In actual fact you need to to consider the size distribution of the new feed going to the mill, the grind characteristics of the new feed, the performance of ...
2
REPLIES
1525
VIEWS
Started by John Leumas
I am looking for information on methods to weigh or count grinding balls being added to a large SAG mill. We have rotary feeders and launders that allow balls to roll by gravity from the launder to the SAG mill belt conveyor about 50 ft upstream of t...
I am looking for information on methods to weigh or count grinding balls being added to a large SAG mill. We have rotary feeders and launders that allow balls to roll by gravity from the launder to the SAG mill belt conveyor about 50 ft upstream of t...
Last replied to by superiorsam
I have seen a laser of sort that balls roll past to count but had problems. Also, load cells on hopper, magnet on load cell if using magnet to load balls. Some units are also more controlled and onl...
I have seen a laser of sort that balls roll past to count but had problems. Also, load cells on hopper, magnet on load cell if using magnet to load balls. Some units are also more controlled and onl...
1
REPLY
2077
VIEWS
Started by Jorge Quintanilla
Hello everyone. I am working on a new mining project in Bolivia. The listed mills are: METSO 9x13 Feet Ball Mill with 500 HP motor METSO10.5x14ft Rod Mill with 700 HP motorThe design of the foundation for dynamic equipment consists of two parts, t...
Hello everyone. I am working on a new mining project in Bolivia. The listed mills are: METSO 9x13 Feet Ball Mill with 500 HP motor METSO10.5x14ft Rod Mill with 700 HP motorThe design of the foundation for dynamic equipment consists of two parts, t...
Last replied to by Mike
First off the static load is not just the weight of the equipment, it also includes the charge and the feed (ore + water). The dynamic load is the static load + the impact load of the cascading medi...
First off the static load is not just the weight of the equipment, it also includes the charge and the feed (ore + water). The dynamic load is the static load + the impact load of the cascading medi...
4
REPLIES
1549
VIEWS
Started by adbcbd
Hello, I have around 10 Kgs in total of different stone ores like sulfur and quartz and stibnite that I need to grind to 1.5mm. However, I don't want to pay much and don't have so much free time to spend grinding. I tried to search for solution...
Hello, I have around 10 Kgs in total of different stone ores like sulfur and quartz and stibnite that I need to grind to 1.5mm. However, I don't want to pay much and don't have so much free time to spend grinding. I tried to search for solution...
Last commented on by Mike
Time vs money
Time vs money
4
REPLIES
1929
VIEWS
Started by Partha@Mech
E= 10 Wi (1/√P80- 1/√F80) E= Specific Energy, Wi= Work Index,P80= Output,F80= Feed After this we need to multiply certain factors such wet/dry Factor, Separation Factor, Dia. factor, Open/Closed Circuit Factor etc.. E= 10 Wi (1/√P80- 1/√...
E= 10 Wi (1/√P80- 1/√F80) E= Specific Energy, Wi= Work Index,P80= Output,F80= Feed After this we need to multiply certain factors such wet/dry Factor, Separation Factor, Dia. factor, Open/Closed Circuit Factor etc.. E= 10 Wi (1/√P80- 1/√...
3
REPLIES
1837
VIEWS
Started by psvssharsha
How to control Ball mill grinding & classification circuit without DCS system for effective control on continuous operation
How to control Ball mill grinding & classification circuit without DCS system for effective control on continuous operation
4
REPLIES
1608
VIEWS
Started by Ilkaar
Dear all, What can be the causes of coarse balls ejection from a ball mill? this happened after liners replacement.
Dear all, What can be the causes of coarse balls ejection from a ball mill? this happened after liners replacement.
2
REPLIES
1352
VIEWS
Started by Millza79
For an existing concentrator (with existing installed crushers and mills) where a new deposit is being locked at. What comminution tests should you do? I would have thought SMC and BBMWI are a must, with maybe UCS and crushing impact tests also impo...
For an existing concentrator (with existing installed crushers and mills) where a new deposit is being locked at. What comminution tests should you do? I would have thought SMC and BBMWI are a must, with maybe UCS and crushing impact tests also impo...
Last commented on by Alex Doll
hmm, the parser screwed up the maths. It was supposed to say "current ore RWi much less than BWi, but new ore RWi much greater than BWi", then...
hmm, the parser screwed up the maths. It was supposed to say "current ore RWi much less than BWi, but new ore RWi much greater than BWi", then...
4
REPLIES
1946
VIEWS
Started by weethengtan
Hi, there. Currently our open-circuit, wet overflow rod mill 6ft x 12ft, feed size
Hi, there. Currently our open-circuit, wet overflow rod mill 6ft x 12ft, feed size
Last replied to by weethengtan
Hi Alex, Thank you for your guidance. I came across a relationship in an article stating Q = k*L*D^2.5 where Q is capacity and k is a constant. It's great to find similarity with your relationship in ...
Hi Alex, Thank you for your guidance. I came across a relationship in an article stating Q = k*L*D^2.5 where Q is capacity and k is a constant. It's great to find similarity with your relationship in ...
1
REPLY
1391
VIEWS
Started by banyechan
Our customers in CaCo3 grinding fileds,just sent us operating conditions in grinding.What types of balls are better for drying grinding?
Our customers in CaCo3 grinding fileds,just sent us operating conditions in grinding.What types of balls are better for drying grinding?
Last replied to by weiliu2002
Cast balls are better for drying grinding and forged balls are not. In a drying grinding circumstance, working temperature of balls can reach to 300 above which will temp the forged balls and therefor...
Cast balls are better for drying grinding and forged balls are not. In a drying grinding circumstance, working temperature of balls can reach to 300 above which will temp the forged balls and therefor...
7
REPLIES
1971
VIEWS
Started by Brendan158
Hello Mets, I'm looking for information around rod mill media size selection to prevent rod tangling. There is the rule that the length of the mill/rod should be 1.4 to 1.6 times the diameter but there is very little information on if there is a min...
Hello Mets, I'm looking for information around rod mill media size selection to prevent rod tangling. There is the rule that the length of the mill/rod should be 1.4 to 1.6 times the diameter but there is very little information on if there is a min...
Last replied to by Brendan158
How does make-up rod diameter affect the risk of tangling?
How does make-up rod diameter affect the risk of tangling?
1
REPLY
1953
VIEWS
Started by Jorge Quintanilla
Tin Ore Classification One of the most recent tin projects in Bolivia involves the classification into four ranges:1. -1,800 micron +850 micron2. - 850 micron +212 micron3. -212 micron +45 micron4. -45 micron +30 micronTo obtain this classificatio...
Tin Ore Classification One of the most recent tin projects in Bolivia involves the classification into four ranges:1. -1,800 micron +850 micron2. - 850 micron +212 micron3. -212 micron +45 micron4. -45 micron +30 micronTo obtain this classificatio...
Last commented on by Jorge Quintanilla
Excellent observation. I appreciate the comment that helps us in making decisions
Excellent observation. I appreciate the comment that helps us in making decisions
1
REPLY
1628
VIEWS
Started by Namo2014
I need help on calculating (formula) SAG Mill volume solids and what a power load curve means? I have attached a sample of bearing press vs power draw for one of our SAG mills. Could someone help me with what my load curve means?
I need help on calculating (formula) SAG Mill volume solids and what a power load curve means? I have attached a sample of bearing press vs power draw for one of our SAG mills. Could someone help me with what my load curve means?
3
REPLIES
1799
VIEWS
Started by m_aazami
Hello Everybody my question is: in whole the document about technical specification of ball charge media of ball mill, it is stated that the hardness of ball media in startup of the plant should be a little lower than ball media in continuous opera...
Hello Everybody my question is: in whole the document about technical specification of ball charge media of ball mill, it is stated that the hardness of ball media in startup of the plant should be a little lower than ball media in continuous opera...
Last replied to by Mike
The slightly lower hardness is to allow the media to establish a natural size distribution faster. When the mill is first stated a guess is made is to a media distribution and then it is operated to...
The slightly lower hardness is to allow the media to establish a natural size distribution faster. When the mill is first stated a guess is made is to a media distribution and then it is operated to...
1
REPLY
1639
VIEWS
Started by Saghar
Hello, I am working on air classification operations in a cement plant. The final air classifiers (High efficiency type, manufactured by polysius) have high values of bypass, let's say around 40%. I wanted to know what are common practices to reduce ...
Hello, I am working on air classification operations in a cement plant. The final air classifiers (High efficiency type, manufactured by polysius) have high values of bypass, let's say around 40%. I wanted to know what are common practices to reduce ...
2
REPLIES
1397
VIEWS
Started by Saghar
Can anyone kindly help me determine selection function and breakage function in a laboratory rod mill? I need a reference that completely describes the process of determining grinding kinetics in rod mills
Can anyone kindly help me determine selection function and breakage function in a laboratory rod mill? I need a reference that completely describes the process of determining grinding kinetics in rod mills
1
REPLY
1699
VIEWS
Started by Dachmann
Hello, I was told in this forum that economic efficiency is one of the major reasons for the ongoing popularity of Tumbling Mills in mineral processing. Concerning my questions I need some insight of experts with practical experience. Looking at SA...
Hello, I was told in this forum that economic efficiency is one of the major reasons for the ongoing popularity of Tumbling Mills in mineral processing. Concerning my questions I need some insight of experts with practical experience. Looking at SA...
3
REPLIES
1935
VIEWS
Started by MSKabir
During rotation of a SAG mill, the three prominent zones are the grinding zone, tumbling or cascading zone and the cataracting zone (crushing zone). Are there any studies about the percentage of wear in the areas mentioned and what type of wear domin...
During rotation of a SAG mill, the three prominent zones are the grinding zone, tumbling or cascading zone and the cataracting zone (crushing zone). Are there any studies about the percentage of wear in the areas mentioned and what type of wear domin...
1
REPLY
3490
VIEWS
Started by JuniorMet
Hi colleagues. I want to know what is the percent solids we are working at, inside the sag mill. Should I sample the pulp discharged to the sump and measure % solids there? How can I calculate the solids percent using the circulating load or the over...
Hi colleagues. I want to know what is the percent solids we are working at, inside the sag mill. Should I sample the pulp discharged to the sump and measure % solids there? How can I calculate the solids percent using the circulating load or the over...
1
REPLY
1669
VIEWS
Started by Sarah
Hello everyone, I would like to know which one is efficient in iron ore crushing and grinding circuit: Jaw crusher+SAG mill+ ball mill 3 stage crushing + 2 stage grinding (ball mill) Regards, Suvd
Hello everyone, I would like to know which one is efficient in iron ore crushing and grinding circuit: Jaw crusher+SAG mill+ ball mill 3 stage crushing + 2 stage grinding (ball mill) Regards, Suvd
Last replied to by Mike
Without looking at the tonnages involved and the ore characteristics it cannot be determined. Both are efficient depending on your ore. The actual efficiency of one over the other is dependent on th...
Without looking at the tonnages involved and the ore characteristics it cannot be determined. Both are efficient depending on your ore. The actual efficiency of one over the other is dependent on th...
2
REPLIES
2005
VIEWS
Started by Millza79
For a SAG Mill or ball mill; what is the difference between a installed motor power and Mill Motor Size at Pinion? And why do SAG mills have a different Mill Motor Sizes at Pinion than ball mills (when they both have constant installed motor pow...
For a SAG Mill or ball mill; what is the difference between a installed motor power and Mill Motor Size at Pinion? And why do SAG mills have a different Mill Motor Sizes at Pinion than ball mills (when they both have constant installed motor pow...
Last replied to by Mike
In addition to Alex's comments, there are additional "losses" in the mechanical side. The input to the gears and the output from the pinion to the shell are always different, with mechanical losse...
In addition to Alex's comments, there are additional "losses" in the mechanical side. The input to the gears and the output from the pinion to the shell are always different, with mechanical losse...
1
REPLY
1959
VIEWS
Started by richardh
Hi What is the optimum method of controlling a cluster of hydrocyclones used in a closed mill circuit so as to obtain the best performance? Is simple sump level control sufficient?
Hi What is the optimum method of controlling a cluster of hydrocyclones used in a closed mill circuit so as to obtain the best performance? Is simple sump level control sufficient?
Last replied to by Alex Doll
Ideal hydrocyclone control is constant pressure, feed density, and flow rate. These three things are difficult to control in the real world which is why people settle for poor hydrocyclone performance...
Ideal hydrocyclone control is constant pressure, feed density, and flow rate. These three things are difficult to control in the real world which is why people settle for poor hydrocyclone performance...
2
REPLIES
1848
VIEWS
Started by Eder Figueiredo
Hi everybody, During performing some Ultrasonic Testing (UT) to measure the thickness of the mill discharge trunnion I found excessive wear. I can say it is in a critical state. Everything indicates that slurry seeped underneath trunnion or shell ...
Hi everybody, During performing some Ultrasonic Testing (UT) to measure the thickness of the mill discharge trunnion I found excessive wear. I can say it is in a critical state. Everything indicates that slurry seeped underneath trunnion or shell ...
Last commented on by Eder Figueiredo
Thanks, David. I will look for a Devcon representative in Brazil and also consider Hoffman engineering as a second option. For temporary repair with reinforced urethane filler. Does the structural ...
Thanks, David. I will look for a Devcon representative in Brazil and also consider Hoffman engineering as a second option. For temporary repair with reinforced urethane filler. Does the structural ...
1
REPLY
1800
VIEWS
Started by Babacata
Dear All, I would appreciate your opinion, if you could give me some indication on our ball consumption at our factory, do you think that there is a room for significant improvement? I am attaching the basic data sheet of our zinc-lead mine/fac...
Dear All, I would appreciate your opinion, if you could give me some indication on our ball consumption at our factory, do you think that there is a room for significant improvement? I am attaching the basic data sheet of our zinc-lead mine/fac...
1
REPLY
1651
VIEWS
Started by Tristopher1234
Our 12,500,lb cap. Ball mill is not level. This causes the charge to be 65% or so on one end and the other level is way below the balls on the other end. I would think that this would not allow the material to grind properly on either end. The mil...
Our 12,500,lb cap. Ball mill is not level. This causes the charge to be 65% or so on one end and the other level is way below the balls on the other end. I would think that this would not allow the material to grind properly on either end. The mil...
Last replied to by Alex Doll
What happens when you increase the water addition? A higher pulp density might help to level out the charge. Is the mill actually level, or is it tipped towards one side? Are the lifters the same ...
What happens when you increase the water addition? A higher pulp density might help to level out the charge. Is the mill actually level, or is it tipped towards one side? Are the lifters the same ...
0
REPLIES
1425
VIEWS
Started by Rahul bhoraniya
hello everyone please tell me how to measure capacity of batch type ball mill used in Ceramic body or Sanitaryware body? How to calculate guide me
hello everyone please tell me how to measure capacity of batch type ball mill used in Ceramic body or Sanitaryware body? How to calculate guide me
Hi guys, If you got Moly-Cop v3.0, could you share it with me? I would appreciate it.