Dorr thickener pdf files

Dorr develops washing tray thickener and opens overseas offices in paris and berlin. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. In sections same district, the dorr thickener was born in 1905. Buckeye coal company, nemacolin mine, nemacolin, greene county, pennsylvania. Contact information mining records curator arizona. Shear effects, introduced by raking within a thickener for example, are known to affect the settling of. In my experience however it would be a big step for someone who has not designed a thickener to endeavor to do one from a low starting point of understanding of the principles etc.

Performance analysis of high efficiency thickeners to. A long transit time and a minimum of agitation are the desirable conditions achieved in this equipment. The scum layer associated with fs settling can be signi. It can be used to concentrate slurries, classify solids in liquid suspensions, degrit liquids, and for washing or. Fines or clear overnow rake assembly revolves on circular track feed bames sludge pump fig. Lowering respirable dust at an iron ore concentrator plant through improved ventilation practices a. From nonfloc to flocc, the size difference can be 5 to 10 times smaller, sometimes. For the rest of the time, however, thickener performance or lack of it seriously affects the rest of the operation. What you need to convert a sld file to a pdf file or how you can create a pdf version from your sld file. The settling rates you mention in the thickener are typically calculated using stokes equation and the retention time provided by the thickener and then confirmed by settling tests of the thickener feed slurry. As the sludge is thickened for four times as long, it is not possible to remove it with a pump, and manual extraction is carried out. It passes through a maxima, as at very low concentration settling rate is constant, and at high concentration the rate decreases rapidly. Peration of dorrtype thickeners was analyzed by c,oe.

The northeast pipe, referred to in the literature as the east pipe was not mined until the advent of modern openpit. Files are available under licenses specified on their description page. The solution foskor, confi dent in the teams ability to engineer a solution, provided a section of their concentrate thickening plant to. Here are the links of the mill newsletters that are available for download. A description of the sedimentation process during dynamic thickener operation a. The settling rate determines the thickener area, or if the. Flsmidth delivers sustainable productivity to the global mining and cement industries. Rearrange individual pages or entire files in the desired order. The invention of the dorr thickener clarification and thickening involve the settling of one sub stance in solid particulate form through a second substance in liquid. Timko national institute for occupational safety and health, pittsburgh research laboratory, pittsburgh, pa, usa introduction in august 2000, the united steelworkers of america.

Photo, print, drawing view facing east, view from river of blast furnace no. The first thickener was invented by dorr in 1905 rendering the continuous dewatering of solidliquid mixture possible. Mine bin 100 tong coarse ore bin tong reci rocatln feeder telsmlth belt co e r 2ft s ng cone fine ore bin 100 tons belt feeder x st marc rod mill. The settling rate of a flotation concentrate increased when the correct flocculant is applied. Preventol d 7s spectrum of activity covers bacteria, including formaldehyderesistant species, fungi, yeast and algae. It is adapted to the needs of the small chemical and metallurgical plants where a relatively small tonnage of finely divided solids must be washed free from a solution in a minimum space. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. Technology 127 the scum layer is important to consider in the design process as it also effectively reduces the volume of the tank. Just click the link and the issue will start downloading. These conventional thickeners often occupy large spaces and are unable to achieve higher solids concentration. Maximum feed size determines the required roll diameter for hard materials crushing, the reduction ratio should not exceed 4 both the rolls run necessarily at the same speed reduction ratio and differential roll. Contact information mining records curator arizona geological. Transport flux, gt,fluxof solids carried by liquid, is independent of the solids settling in the thickener, whether the solids settle or not, there pumping of the sludge from the. Company name design basis o min ejector jet, rebel tank u nit 2 measurement 3 equipment system wil by hatwtic by.

It is reasonably easy to determine a thickener area requirement from settling data but that is simply the first step on a fairly long journey. Call it what you will dilution, postholing, ratholing, coning it becomes a serious and expensive prob lem. One of these leading technologies is our pump product line which helps our customers transport liquidsolid slurries to their desired destination. I huge thank you for all that helped with this issues. Modeling the effects of ore properties on water recovery in the. Thickener design procedure and method thickening, filtering. Dunn 2 paste 2014, vancouver, canada consolidation theory was applied to the settling of compressible slurries shirato et al. A hydrocyclone, also known simply as a cyclone, is a centrifugal device with no moving parts.

Waterexs designs are backed by our own laboratory capability and pilot thickener plant allowing waterex to continually develop state of the art technologies for specific applications. The pilotscale thickener facility used in this study is a closed loop system and is shown schematically in fig. Staff will understand how to use simply thick thickener to thicken liquids. Dorr oliver eimco doe is a leading supplier of high performance liquidsolid separation equipment and process systems. The invention of the dorr thickener in 1905 and its. Dorroliver eimco doe is a leading supplier of high performance liquidsolid separation equipment and process systems. Spreckels sugar beet bulletin 1720 19531956 following pages were flagged. How to operate a grinding circuit how to operate a flotation circuit. Pittsburgh steel company, monessen works, donner avenue, monessen, westmoreland county, pa photos from survey haer pa253.

A description of the sedimentation process during dynamic. Lowering respirable dust at an iron ore concentrator plant. List out different minerals responding to magnetic separation. The ball mill is in closed circuit with a dorr classifier which delivers a product 90jc through 200 mesh to the cyanide plant consisting of four pachuoa tanks, thickeners and oliver filters zinc dust is used to precipitate the values, which are refined in the refinery above the mill, and the gold shipped as bars. A pdf printer is a virtual printer which you can use like any other printer. Member, society of metallurgical and exploration engineers of the american institute of mining, metallurgical, and petroleum engineers gravity sedimentation operations kent brown, b. Use add comment to comment on someone elses reply in an already.

A century of research in sedimentation and thickening jstage. Dorrs solution was to invent a reciprocating rake classifier to replace inadequate classifying cones. In section 3, results relat control and continuous operation in fine solidliquid ed to ideal suspensions, including the extension of mixtures and the size. Fedwa baffle systems are a simple, practical method of dissipating inlet energy and enhancing flocculation in primary. Weir minerals believed that the warman ahf pump technology would be ideal for the foskors concentrate thickener optimisation programme. Eimco and dorroliver thickeners are available in both. This is duo to the fact that thickeners are limited by permeability and compressibility in. Thickeners waterex has been designing and engineering thickeners since 1965 for a range of industrial and mining applications. Detail of dorr thickener kennecott copper corporation, on copper river and northwestern railroad, kennicott. Files of the type sld or files with the file extension.

The suspension was prepared in a tank where the correct amount of flocculant was added. East wall of dorr thickener area kennecott copper corporation, concentration mill, on copper river and northwestern railroad, kennicott, valdezcordova census area, ak haer ak1d58. Thickeners are simple, reliable, effective and efficientunder the right conditions. Call it what you will dilution, postholing, ratholing, coning it becomes a serious and expensive problem. What you need to convert a csd file to a pdf file or how you can create a pdf version from your csd file. Effect of flocculant on settling and filtration rates. The overflow liquid is removed from the thickener in a peripheral launder. Preservation preventol d 7 can be incorporated at any stage of the production process but is best added to the feedwater first. Dorr thickener is equipment used for classification sedimentation clarification leaching steam distillation is used to separate 1. In many plants, thickener problems are a regular, daytoday operational event. Two peristaltic pumps were connected to the equipment, one to feed the thickener and the other for the removal of the concentrate at the. Wet corn milling center for crops utilization research. Optimisation of thickener performance semantic scholar.

The first thickener was invented by dorr in 1905 rendering the continuous dewatering of solidliquid mixture possible dorr, 1915. Feed slurry enters the feed well, which is usually located in the centre of the thickener, through a pipe. Transport flux, gt,fluxof solids carried by liquid, is independent of the solids settling in the thickener, whether the solids settle or. The dorr washing thickener is of the multipletray type and is, in effect, a complete countercurrent decantation plant in a single compact unit. It was accepted virtually immediately and subsequently marketed to other western mills. As the marketleading supplier of engineering, equipment and service solutions, flsmidth improves performance, drives down costs, and reduces the environmental impact of operations. I know it is a few days early but volume 4 issue 2, of the mill newsletter is ready for download. Pdf a century of research in sedimentation and thickening. Dorr oliver eimco pdf in august of, dorr oliver and eimco joined the worldwide operations of flsmidth minerals, complementing their cement and minerals divisions. Unlike conventional thickener area calculations, the test procedure demonstrates the dependence of the flux curve.

Wet corn milling center for crops utilization research 1041 food sciences building, iowa state university, ames, ia 50011 515 2940160 ur. This robert ramsey article, now in the public domain, is based largely on information furnished by c. In the 1970s, paste thickener was introduced abbott, et al. Flsm powerpoint presentation template flsmidth logo. The survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. Section ii q7 a state the various goals of software design. Our products include the popular krebs millmax severeduty slurry pumps, dorroliver ods pumps, and technequip knife gate valves.

Model predictive control of a paste thickener in coal. Two years later, dorr invented the continuous processing thickener, the first continuous, mechanically equipped sedimentation unit. Mar 26, 2020 here are the links of the mill newsletters that are available for download. Using add reply allows you to attach images or pdf files and provide a more complete input. Files of the type csd or files with the file extension. Mining and processing methods the historic colosseum mine was developed as underground workings within the southwestern most of two felsite rhyolite breccia pipes. Thickener prototype experiments a prototype of a continuous dorr oliver thickener with 0,05 m2 and 1,70 m was built. Staff will understand the importance of using simply thick thickener to thicken liquids. Your door was always open for me to discuss any issues i.

It starts with the early design of the dorr thickener and. If youre in business, youve probably got some ebooks, whitepapers, or other pdf files that are large in file size. However, if higher temperatures 40 c or ph 9 values are likely to occur during the. The filtration rate of that same flotation concentrate increased when the correct type and amount of floc is applied. Derive the relationship between the current sharing resistors in terms of the. Dorroliver pulse transfer thickening a cost effective solution to sludge dilution problems in wastewater treatment plants lic resistance and the net result is more and more dilution as the pumping cycle continues. Thickeners and clarifiers complete range of reliable and cost. With our efficient feed dilution and flocculation technology, we provide superior thickening performance in the form of better overflow clarity and higher underflow. The conventional thickener relies on the settling velocity of the particles, due to gravity, being greater than the upward velocity of water being displaced to the overflow launder. Research indicates that this particular dorr separator was the first of its kind to be constructed and used in delaware and hudson coal company operations. Settlingthickening tanks for fs treatment are rectangular tanks, where fs is discharged into an inlet at the top of one side and the supernatant exits through an outlet situated at the opposite side, while settled solids are retained at the bottom of the tank, and scum. A cost effective solution to sludge dilution problems in wastewater treatment plants. The southwest pipe is also referred to in the literature as the west pipe.