SE202450C1

SE202450C1 -

Info

Publication number: SE202450C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: PAHH FaldstrOm och H L Lundberg Foreliggande uppfinning avser ett .satt vid stenmalning, varvid malstenar beredas och uttagas till en malkrets omfattande ett krossningssteg i finkross och ett primarmalningssteg i stang- eller kulkvarn foljt av ett eller fiera finmalningssteg i en stenmalningskvarn eller stenmalningskvarnar. Inventors: PAHH FaldstrOm and H L Lundberg The present invention relates to a set of stone grinding, wherein grinding stones are prepared and taken out to a grinding circuit comprising a crushing step in fine grinder and a primary grinding step in a rod or ball mill followed by one or more fine grinding steps in a stone grinding mill.

Ett vanligt satt att genomfora s. k. stenmalning bestar dari, att maim eller annat styckeformigt material forst underkastas krossning i ett antal steg till en styckestorlek lamplig for materialets ,sonderdelning i stangeller kulkvarnar avsedda for malning av grovt material, varefter den salunda grovmalda produkten underkastas stenmalning i ett eller flera steg for slutlig avpassning av malproduktens finlek. Vid stenmalningen utgOras da malkropparna av lampliga stycken av sjalva malgodset, t. ex. malmen, vanligen med en styckestorlek, som vid pamatningen varierar mellan 20 och 60 mm. Denna s. k. malsten uttas i samband med materialets krossning, i det man i krossverket anordnar en sikt forsedd med tvh storleksbegransande siktplatar sa anordnade, ,att Over den grovre siktplaten avsiktas material som är grovre an den onskade styckestorleken hos stenarna i malchargen, och att genom den finare siktplaten fransiktas material som är finare an den finaste moisten, med vilken stenkvarnen skall chargeras. Malstenen uttages (Tailor som grov fraktion ph det finare siktdacket, varifran det le-des till sarskilda lagringsfickor. Fran dessa sattes den alltefter behov till resp. kvarnar med hjalp av matar- och transportanordningar. A common method of carrying out so-called stone grinding consists in that maim or other piece-shaped material is first subjected to crushing in a number of steps to a piece size suitable for the material, probing into rods or ball mills intended for grinding coarse material, after which the saluna coarsely ground product is subjected to stone grinding in a or several steps for final adjustment of the fineness of the grinding product. In stone grinding, the grinding bodies then consist of suitable pieces of the grinding material itself, e.g. the ore, usually with a piece size, which when fed varies between 20 and 60 mm. This so-called grind is taken out in connection with the crushing of the material, in that a sieve arranged with two size-limiting sieve plates is arranged in such a way that over the coarser sieve plate material which is coarser than the desired piece size of the stones in the malt charge is intended, and that finer sieve plate franchised material that is finer than the finest moisten, with which the stone mill is to be charged. The grindstone is taken out (Tailor as a coarse fraction of the finer screen deck, from which it is led to special storage pockets. From these it was set as needed to the respective mills with the help of feeding and transport devices.

Ehuru detta forfarande framforallt i vissa nyanlagda malverk visat sig andamilsenligt har man kunnat konstatera, att forfarandet ofta fir mindre lanapligt vid overgang till sten- Dupl. kJ. 50 c: 17/ malning i aldre anlaggningar, vars krosschema icke tillater uttagande av malstenar pa namnda salt utan storre ombyggnad eller vid vilka t. ex. utrymmen icke forefinnas fer byggande av sarskilda malstensfickor i den befintliga anlaggningen. Although this procedure, especially in some newly constructed mills, has proved to be of great importance, it has been found that the procedure is often less laborious at the transition to stone- Dupl. kJ. 50 c: 17 / grinding in older plants, the crushing scheme of which does not allow the removal of grinding stones on the said salt without major conversion or at which e.g. spaces do not exist for the construction of special millstone pockets in the existing facility.

Uppfinn.arna ha utarbetat ett satt samt anordningar f8r uttagande av malstenar for stenmalning, vilket satt kan anpassas till ett mycket stort ,antal aldre kross- och malanlaggningar med endast smh tillkommande arrangemang, och som tillater ,anordnandet av nya anlaggningar med enklare medel an som hittills varit kant. The inventors have developed a set and devices for extracting grindstones for stone grinding, which set can be adapted to a very large, number of aged crushing and grinding plants with only small additional arrangements, and which allow, the arrangement of new plants with simpler means such as so far been edge.

Det for forfarandet speciellt kannetecknande besthr enligt uppfinningen dari, att clef for malning avsedda godset i sin helhet krossas till en for primarmalning i stang- eller kulkvarn erforderlig styckestorlek, och .att ur det salunda krossade godset fransiktas de for an vandning vid finmalning i stenmalningskvarn avsedda malstenarna, fOretradesvis I samband med att materialet matas till primarkvarnen. Enligt detta forfarande behova endast mycket sma lagerbehallare fOr malstenarna for malmens finmalning anordnas. For uttagning av namnda m.alstenar erfordras dessutom en mindre siktutrustning an om man i ett krossverk periodvis uttar malstenar fran hela den delvis krossade produkten. Forfarandet ger ytterligare fordelar utaver kanda metoder, om man for malmens krossning anvander en. kross med Alt omstallbar spalt8ppning, t. ex. en hydrauliskt installhar spindelkross. Med detta forfarande vinnes, att man sh gott som omedelbart kan paverka malstenarnas storleksf5rdelning vid dess matning till maltrumman, enar inga storre lagringsutrymnaen forefinnas pa malstenarnas transportvag till slutkrossningssteget. Slutligen kan enligt uppfinningen 2202 4 atghng av malsten och uttagning av densamma loingas i jamvikt genom en omstallning av den maskvidd vid vilken malstenar avskiljas. The special feature of the invention according to the invention is that the clef for grinding the goods in their entirety is crushed to a piece size required for primary grinding in a rod or ball mill, and that the goods intended for use in fine grinding in stone grinding mills are disassembled. the grinding stones, in particular in connection with the material being fed to the primary mill. According to this method, only very small storage containers need be provided for the grinding stones for the fine grinding of the ore. For the removal of the mentioned millstones, a smaller screening equipment is also required if a crushing plant is periodically removed from the entire partially crushed product. The process provides additional advantages over known methods, if one is used for crushing the ore. crusher with All adjustable gap opening, e.g. a hydraulically installed spindle crusher. With this method it is gained that one can almost immediately affect the size distribution of the millstones when it is fed to the malting drum, otherwise no larger storage spaces are present on the transport path of the millstones to the final crushing step. Finally, according to the invention 2202 4 access to the grindstone and removal of the same can be lengthened in equilibrium by a rearrangement of the mesh size at which grindstones are separated.

Uppfinningen kall nu beskrivas med tvâ utfOringsexempel under hanyisning till bifogade ritningar, ,dar fig 1 schematiskt visar ett malsystem f6r vatmalning av maim i tva. steg, fig. 2 en schematisk vertikalsektion air en forandrad konstruktionsform av en i fig. 1 vi-sad siktanordning, och fig. 3 en horisontalprojektion av anordningen enligt fig. 2. The invention will now be described by way of two embodiments with reference to the accompanying drawings, in which: Fig. 1 schematically shows a grinding system for water grinding of mills in two. step, Fig. 2 is a schematic vertical section of a modified construction of a screening device shown in Fig. 1, and Fig. 3 is a horizontal projection of the device according to Fig. 2.

Under hanvisning till det i fig. 1 visade malsystemet ingar i detta ett forsta malningssteg, bestaende air en stangkvarn 17, och ett andra malningssteg, bestaende av en stenmalningskvarn 21, I malsystemet ingar vidare en konkross 1 men stallbar krosskron.a eller krossmantel. Krossen 1 fir forsedd med anordningar 2 av kand konstruktion f6r tillforsel av gods samt med uppsamlings- och transportanordning 3 for ledande av fardigkrossat gods till en ficka 4, vars storlek är avpassad efter lagringsbehovet for den efterfoljande behandlingen. Fickan dr i sin underdel forsedd med ett eller flera utlopp 5, vilka sta i forbindelse med en eller flera matare 6, anordnade att pa ett reglerbart satt overfora krossgodset till en bandtransportor 7. Mataren 6 eller transport& ren 7 Or lampligen utrustad med vaganordningar av kand konstruktion. Vid transport& rens dude har anordnats en sikt 9, som yid sin palastningsande ärr forsedd med ett motorstyrt spjall 8. Sikten 9 dr birsedd med en siktplat, Tars oppningar aro sa avpassade att man med hansyn till den thiskade malstensmangden och den valda installningen pi nedkrossningen erhaller lagom kvantitet groya stycken, som icke passerar siktoppningarna, vanligen 20— .60 mm diam. Under sikten 9 dr anordnad en tratt eller uppsamlingsbehallare 10 samt en ranna eller ledning 11, som mynnar i stangkvarnen 17. Siktens 9 aylastningsande mynnar Over en mindre utjamningsbehallare 12, vars storlek dr sa vald, att den alltid kan rymma malstenar i ett sadant oyerskott, att em malstenstillf5rseln tillfalligtyis skulle utebli ph grund ay variationer i styekestorleken hos del fran. fickan 4 utmatade krossgodset, det anda alltid star en viss kvantitet malstenar till fOrfogande. I behallaren 12 är insatt en nivakannare 13, som star i forbindelse med en regulator 14, anordnad att vid impuls fran nivakannaren pa hydraulisk, pneumatisk, elektrisk eller mekanisk vag omstalla spjallet 8 till 6kad eller minskad uttagning av malstenar frail transportoren 7 Over sikten 9 till behallaren 12 ph. ett satt, som kommer att be-skrivas narmare i det foljande. Utjamningsbehallaren 12 dr nedtill f5rsedd med en 8pp- ning 15, som mynnar 1 en mataranordning, t. ex. en bandtransport6r 16, vilken lampligen är forsedd med en anordning for vagning av mangden utmatade malstenar. Fran mataren 16 leder ett ror eller en ranna till stenmalningskvarnen 21. Stangkvarnens 17 utmatningsdel Or forenad med en sorterare 18 via en ledning 19. Sorteraren 18 kan vara air mekanisk typ men kan aven utgoras av pump med hydrocyklon. Sorteraren Or forsedd med en anordning 20 for transport av grovt gods till stenmalningskvarnen 21. Sorteraren dr vi-dare forsecld med en anordning 23 f5r utmatning av avskilt fardigmalt gods. Stenmalningskvarnen 21 bestar i det visade exemplet av en roterande trumkvarn ay land typ, i vilken malkropparna genom sin erhallna rorelse bringas att sonderdela malgodset, varvid de samtidigt sj Alva farslitas. For uppfinningens verkningssatt dr det emellertid icke nodvandigt att malningen genomfores i roterande trumkvarnar, utan aven andra kvarnkonstruktioner arbetande med rorliga malkroppar och samma material som malgodset kunna givetvis anvandas. Trmnkvarnens utmatningsdel Or forenad med sorteraren 18 via en anordning 22, som t. ex. utgores air en ranna eller ledning. Stemnalningskvarnen 21 drives ay en el-motor 24 Over en kuggvaxel 25. Till motorn 24 dr kopplat ett effektkannande registreringsorgan 26, anordnat att kontinuerligt registrera motoreffekten. Registreringsorganet dr elektriskt forbundet med ett effektreglerrela 27 med installbara maximi- och minimigranslagen. Effektreglerrelaet 27 dr inkopplat pa en. manoverstromstallare 28 for mataranordningens 16 drivmotor 29. Referring to the grinding system shown in Fig. 1, a first grinding step, consisting of a rod mill 17, and a second grinding step, consisting of a stone grinding mill 21, are included in the grinding system. A concrete 1 but an adjustable crushing crown or crushing jacket is further included. The crusher 1 is provided with devices 2 of known construction for the supply of goods and with collecting and transport device 3 for guiding finished crushed goods to a pocket 4, the size of which is adapted to the storage need for the subsequent treatment. The pocket therein is provided in its lower part with one or more outlets 5, which are in connection with one or more feeders 6, arranged to transfer the crushed goods in a controllable manner to a belt conveyor 7. The feeder 6 or conveyor & tube 7 Or suitably equipped with carriage devices of kand construction. At the transport & the dude, a screen 9 has been arranged, which is fitted with a motor-controlled damper in its loading end 8. The screen 9 is equipped with a screen plate, Tars openings are so adapted that with regard to the amount of grinding and the selected installation in the crushing, one obtains suitable quantity groya pieces, which do not pass the sight openings, usually 20— .60 mm diam. Under the screen 9 there is arranged a funnel or collecting container 10 and a gutter or conduit 11, which opens into the rod mill 17. The loading end of the screen 9 A small leveling container 12, the size of which is chosen so that it can always hold grindstones in such an overhang, that the supply of bricks would be accidentally absent due to variations in the size of the part. pocket 4 discharged the crushed goods, the spirit always has a certain quantity of millstones at its disposal. Inserted in the container 12 is a level jug 13, which is connected to a regulator 14, arranged to, on impulse from the level jug on hydraulic, pneumatic, electrical or mechanical scale, switch the damper 8 to 6cad or reduced removal of grindstones from the conveyor 7. container 12 ph. a sat, which will be described in more detail in the following. The leveling container 12 is provided at the bottom with an opening 15, which opens into a feeding device, e.g. a belt conveyor 16, which is suitably provided with a device for weighing the plurality of dispensed grindstones. From the feeder 16 a tube or a gutter leads to the stone grinding mill 21. The discharge part Or of the rod mill 17 is connected to a sorter 18 via a line 19. The sorter 18 can be air mechanical type but can also consist of a pump with hydrocyclone. The sorter Or is provided with a device 20 for transporting coarse goods to the stone grinding mill 21. The sorter is further provided with a device 23 for discharging separated finished painted goods. In the example shown, the stone grinding mill 21 consists of a rotary drum mill of the land type, in which the grinding bodies are caused to probe the grinding material by their obtained movement, whereby they are simultaneously torn apart by Alva. For the effect of the invention, however, it is not necessary that the grinding is carried out in rotating drum mills, but also other mill constructions working with movable grinding bodies and the same material as the grinding material can of course be used. The discharge part of the grinder is connected to the sorter 18 via a device 22, which e.g. utgores air a gutter or pipe. The stem grinding mill 21 is driven by an electric motor 24 over a gear shaft 25. A power-sensing recording means 26 is connected to the motor 24, arranged to continuously record the motor power. The registration means is electrically connected to a power control relay 27 with installable maximum and minimum spruce strokes. Power control relay 27 dr connected on one. operating current switch 28 for the drive motor 29 of the feed device 16.

Systemets yerkningssatt Or foljande: Det for malning avsedda materialet, t. ex. maim, matas till krossen 1, varvid genom lamplig installning av krosspalten materialet ges onskad maximal styckestorlek, yanligtvis mindre an. 70 mm. Det krossade materialet uppsamlas och mellanlagras i fickan 4. Krossningen verkstalles namligen vanligen intermittent, medan malningen verkstalles kentinuerligt. Krossat material utmatas genom oppningen 5 med hjalp ay mataren 6. Denna matning Or avpassad efter den onskade avverkningen per tidsenhet i malningsanlaggningen och den darefter eyentuellt foljande behandlingen av malprodukten. AV bandtransportoren 7 fares ,det salunda utmatade materialet Over spjallet 8 fram till sikten 9, som kontinuerligt avsiktar gods med stone storlek On halen i siktplaten. Styckestorleken begran_ sas uppat air den spaltvidd som valts i krossen 1 och neat av siktplatens haldiameter. Mang-den ay det avsiktade godset bestammes ay forbrukningen ay malstenar i kvarnen. 21 och 202 43 kan for olika material normalt variera inom vida granser och utgor, beroende pa dettas sprodhet och sammansattning i ovrigt samt kvarnens 21 varvtal, infodringstyp m. m., mellan 1 och 40 % av den totala matningen. For ett och samma material och en viss malutrustning Or emellertid stenatgangen i stort sett konstant. Det material som pa sserar sikten uppsamlas i tratten 10 och matas av sin egen tyngd eller pa annat satt till stangkvarnen 17. Denna roterar med en charge av malstanger och sonderdelar under sin rotation malmen till en sidan finlek att den kan vidaremalas i kvarnen 21. Vanligen har sikten 9 Oppningar, vilkas storlek varierar fran 20 mm vid inmatningsanden till 60 mm vid utmatningsanden, varigenom malstenarna for kvarnen 21 komma att fa en storlek varierande mellan 20 och 60 mm och det gods som gar till stangkvarnen 17 en storlek av under 2060 mm, vilket storleksintervall norrnalt fir lampligt for stfingkvarnsbehandling. Vid Baalningen tillsattes vatten i stfingkvarnen 17, och Iran denna ledes blandningen av nedmald maim och vatten till sorteraren 18, varigenom frau det avskilda grova godset via ledningen 20 inmatas i stenkvarnen 21. System set or Or as follows: The material intended for grinding, e.g. maim, is fed to the crusher 1, whereby by suitable installation of the crusher gap the material is given the desired maximum piece size, preferably smaller. 70 mm. The crushed material is collected and stored in the pocket 4. Namely, the crushing is usually carried out intermittently, while the grinding is carried out continuously. Crushed material is discharged through the opening 5 with the aid of the feeder 6. This feed is adapted to the desired felling per unit time in the milling plant and the subsequent subsequent treatment of the milling product. OFF the belt conveyor 7 is carried, the thus discharged material Over the slat 8 up to the screen 9, which continuously discharges goods of stone size On the tail in the screen plate. The piece size is limited by the gap width selected in the crusher 1 and not by the holding diameter of the sight plate. The quantity of the intended goods is determined by the consumption of the millstones in the mill. 21 and 202 43 can for different materials normally vary within wide limits and extensions, depending on its spreadability and composition in general and the mill 21 speed, lining type, etc., between 1 and 40% of the total feed. For one and the same material and a certain grinding equipment Or, however, the stone entrance is largely constant. The material which passes through the screen is collected in the hopper 10 and fed by its own weight or otherwise to the rod mill 17. This rotates with a charge of grinding rods and probes during its rotation the ore to a side fine so that it can be further ground in the grinder 21. Usually the screen has 9 openings, the size of which varies from 20 mm at the feed end to 60 mm at the discharge end, whereby the grinding stones for the mill 21 will have a size varying between 20 and 60 mm and the goods going to the rod mill 17 a size of less than 2060 mm, which size range norrnalt fir appropriate for stfingkvarns treatment. At Baalningen, water was added to the stifing mill 17, and in Iran the mixture of ground maim and water was led to the sorter 18, whereby from the separated coarse goods via the line 20 it was fed into the stone mill 21.

Chargeringen av malstenar till kvarnen 21 till* pa foljande Ott: Den for varje onskad malningskapacitet och varje onskad nedmalning erforderliga effekt som maste tillforas kvarnen 21 installes med hjalp av effektreglerreliet 27. Harefter ger detta impuls till mantiverstromstallaren 28 fOr bandtransportorens 16 drivmotor 29 for matningen av malstenar till kvarnen 21. Denna matning pagar tills den av motorn 24 dragna effekten uppnar det forutbestamda maximalvardet, varvid genom impuls fran relaet 27 manoverstrOmstallaren 28 slat- ifran strommen till motorn 29 och matningen av malstenar upph8r. Nar kvarnen arbetar kontinuerligt, forslitas och nedmalas malmstyckena samtidigt som de mala det gods som genom ledningen 20 inmatas frail sorteraren 18, varfor kvarnens effekt standigt stravar att avtaga. Nar effekten sjunkit under det forvag installda minimivardet pa effektreglerrelaet 27, ges filer impuls till manoverstrOmstfillaren 28, varvid strtimmen till drivmotorn 29 tillslas och transportoren 16 fifer borjar mata malstenar till kvarnen 21, varpä cykeln upprepas. Vanligen efterstravas eft iitet intervall mellan maximum- och minimumlagena pa effektreglerreldet 27, men i praktiken kan en effektdifferens pa 5-15 hk accepteras. The charging of grinding stones to the grinder 21 to * on the following note: The power required for each desired grinding capacity and each desired grinding must be supplied to the grinder 21 is installed by means of the power control relay 27. Thereafter this gives impulse to the mantiversom switch 28 for the belt conveyor 16 drive motor 29. grinding stones to the mill 21. This supply pags until the power drawn by the motor 24 reaches the predetermined maximum value, whereby by impulse from the relay 27 the control switch 28 switches off the current to the motor 29 and the supply of grinding stones ceases. When the mill operates continuously, the ore pieces are worn and ground down at the same time as they grind the goods which are fed through the line 20 to the sorter 18, for which reason the power of the mill constantly strives to decrease. When the power has dropped below the pre-set minimum value of the power control relay 27, files are given impulse to the control flow sensor 28, whereby the current to the drive motor 29 is switched on and the conveyor 16 begins to supply grinding stones to the mill 21, whereupon the cycle is repeated. Usually a long interval between the maximum and minimum layers on the power control line 27 is sought, but in practice a power difference of 5-15 hp can be accepted.

Om installningen air spalten i krossen 1 samt diameter. pa sikthalen hos sikten 9 valts riktigt i forhfillande till malsystemet i ovrigt, komma malstenar att tillforas behallaren 12 i samma takt som de med hjalp av transportorren 16 matas till kvarnen 21, och strangt taget kraves endast en mycket liten volym malsten i naranda behallare. Sasom inledningsvis namndes, kan emellertid godsets sammansattning variera vid fickans 4 utlopp 5, varfor behallaren 12 maste vara dim:ensionerad for att kunna utjamna fluktuationer i godsets sammansattning. Genom impulser frau den. i behallaren. 12 anordnade nivakannaren 13 till regulatorn 14 regleras behallarens fyllnadsgrad mellan tva granslagen. Om :saledes de Iran fickan 4 utmatade malstenarna langvarigt skulle fa en storre .styckestorlek an som motsvarar medelstorleken, matas for mycket mal-. stenar till behallaren 12, varvid nivan i behallaren stiger. Nan den nar det Ovre granslaget, ger nivakannaren 13 impuls till regulator. 14, som omstaller det motorstyrda spjallet 8 sa, att malmen hell eller delvis ledes förhi sikten 9 och direkt in. i stfingkvarnen via ledningen 11. Mr nivin i behallaren 12 sjunkit till nivakannarens 13 undre granslage, ger denna pa liknande satt impuls till omstallning air spjallet 8 for okad matning av malstenar till behallaren 12. Om den frail fickan 4 utmatade malmen langvarigt blir finkornigare, kan man, aven om all malm siktas pa sikten 9, icke erhalla tillrficklig matning air malstenar till behfillaren 12, utan nivan i denna kommer standigt att sjunka, tills den liar nivakannarens 13 undre granslage. Detta lfige kan avpassas sh I forhallande till volymen av fickan 4, att den kvarvarande mangden i utjamningsbehallaren 12 tillsammans riled den mangd malstenar som eventuellt tillf5res Over sikten 9 an tillracklig für att uppratthalla jamn matning air malstenar till kvarnen 21, tills en fly sats av maim hunnit inkrossas i fickan 4, varvid man. haft tillfalle att omstalla Imassen och Oka spaltvidden i dengamma, sa att en storre andel grovt gods erhalles. About the installation air gap in the crusher 1 and diameter. on the sieve hall of the sieve 9 is chosen correctly in relation to the grinding system in general, grinding stones will be fed to the container 12 at the same rate as those with the aid of the conveyor 16 are fed to the mill 21, and strictly only a very small volume of grinding stone is required in narrow containers. As initially mentioned, however, the composition of the goods may vary at the outlet 5 of the pocket 4, for which reason the container 12 must be dimensioned in order to be able to compensate for fluctuations in the composition of the goods. Through impulses from it. in the container. 12 arranged the level jug 13 to the regulator 14, the degree of filling of the container between two branches is regulated. If: thus the Iran pocket 4 discharged grindstones long-term would get a larger .piece size corresponding to the average size, fed too much grind-. stones to the container 12, the level in the container rising. When it reaches the Upper spruce stroke, the level jug 13 gives impulse to the regulator. 14, which repositions the motorized damper 8, said that the ore is wholly or partly led in front of the screen 9 and directly inside. in the stem mill via the line 11. Mr nivin in the container 12 has sunk to the lower spruce of the level jug 13, this similarly gives impetus to rearrangement of the air damper 8 for increased feeding of grindstones to the container 12. If the frail pocket 4 discharged ore becomes longer fine, even if all the ore is sieved on the sieve 9, insufficient supply of air grinds to the container 12 is not obtained, but the level therein will constantly decrease until it reaches the lower spruce of the level jug 13. This lfige can be adapted sh In relation to the volume of the pocket 4, that the remaining amount in the leveling container 12 together riled the amount of grinds which may be supplied Over the sieve 9 an sufficient to maintain a uniform supply of air grinds to the grinder 21, until a fly batch of maim had time to be crushed in pocket 4, whereby man. had the opportunity to reorganize Imassen and Oka column width in the old, so that a larger proportion of rough goods is obtained.

Detta regleringssatt är i regel tillfyllest, men uppfinnarna ha aven funnit, att man genom att forse sikten 9 med en siktplfit med siktoppningar av variabel storlek kan forenkla systemet ytterligare och nedbringa den erforderliga volymen p0. utjamningsbehallaren 12. Detta utforingssatt heskrives narmare under hinvisning till fig. 2 och 3, som visa en sikt med variabel siktOppning. Sikten 9 bestar av en i en siktram upphangd svangbar siktlada 30 av kand typ. Det siktande organet bestar av en perforerad plat eller siktduk 31, som. Mlles inspand i siktramen. This control method is usually most complete, but the inventors have also found that by providing the screen 9 with a screen gap with screen openings of variable size, the system can be further simplified and the required volume p0 reduced. The leveling container 12. This embodiment is described in more detail with reference to Figs. 2 and 3, which show a screen with a variable screen aperture. The screen 9 consists of a pivotable 30 of the candle type suspended in a screen frame. The screening means consists of a perforated plate or screen 31, which. Mlles effort in the screen frame.

Siktplatens halarea (diameter) är icke konstant, utan tilltar i siktenslangdriktning. I det visade exemplet fir siktens fOrsta halft forsedd med plat med 20 min runda hal. Siktens andra halft har en haldiameter vid sin &am.- . "finde av 20 mm, varefter halstorleken kontinuerligt tilltar i siktens langdriktning, for att vid avlastningsanden ha natt en. diameter av 60 mm. The tail area (diameter) of the sight plate is not constant, but increases in the sight hose direction. In the example shown, the first half of the screen is provided with a plate with a 20 minute round hall. The other half of the sieve has a holding diameter at its & am.-. "find of 20 mm, after which the neck size continuously increases in the longitudinal direction of the screen, in order to have a diameter of 60 mm at the relief end.

Under sikten är mellan tratten, 10 och behallaren 12 anbragt en rod% fordelaranordning, bestaende av ett svangbart fOrdelarspjall 32 lagrat pa en axel 33. Spjallet 32 är forsett med en havarm 34 for en .drivanordning 35, anordnad att omstfilla spjallet till onskat lage under sikten. Drivanordningen 35 utgores lampligen av en hydraulisk cylinder, vars stfing fir forenad med havarmen 34. En. sadan cylinder man5vreras med olja under tryck, som med hjalp av ventilanordningar kan installa kolvsta.ngen och .det darmed forenade spjallet 32 i vane onskat lage. Andra likvardiga manoverdon kunna aven valj as. Spjallets 32 lfingd och rorelseomradesh avpassat att det i sift mestadels under sikten inforda lage helt tackes av den del .av siktplaten, vars haldiameter Or mellan 20 och 60 mm. Kolvstangens slaglangd Or sh stor att spjallet 32 belt och ballet kan svangas ut fran sitt lage under sikten.. Under the screen, a rod% distributor device is arranged between the hopper 10 and the container 12, consisting of a pivotable distributor slat 32 mounted on a shaft 33. The slat 32 is provided with a lever arm 34 for a drive device 35, arranged to switch the slat to the desired position below sight. The drive device 35 is suitably constituted by a hydraulic cylinder, the stem of which is connected to the sea arm 34. A. such a cylinder is operated with oil under pressure, which with the aid of valve devices can install the piston rod and the associated damper 32 in the desired position. Other equivalent actuators can also be selected. The sling's 32 lfingd and rorelseomradesh adapted that it in sift mostly during the view introduce layer completely thanks to the part .of the sight plate, whose holding diameter Or between 20 and 60 mm. The stroke length of the piston rod Or sh large that the damper 32 belt and the ball can be swung out of its position under the sight ..

Anordningen fungerar pa foljande salt: Maim matas sasom tidigare beskrivits frau kvarnfickan 4 via utloppen 5 och matarna 6 med transportoren 7, varefter den med hjalp av spjallet 8 avlastas ph sikten 9. Pa den forsta halften av sikten avskiljes gods <20 mm, medan pa den andra halftert successivt avskiljes gods med 20-60 ram storlek, medan endast gods med storlek > 60 mm passerar Over siktens bortre anda. Beroende ph fordelarspjallets 32 lage under sikten kan godsfraktionen. 20-60 mm hell :eller delvis aven tillforas fraktionen > 60 nun, varigenom mangden malstenar, som uttages, kontinuerligt kan avpassas efter stenmalningskvarnens 21 behov. Oni stenmalningskvarnens 21 behov kan thekas, av enbart stenar med en styckestorlek > 60 mm, installes fordelarspjallet 32 i sitt yttre andlage, varvid den till behallaren 12 matade mangden malstenar regleras av nivakannaren. 13, regulatorn 14 och spjallet 8, sãsom tidigare beskrivits. The device operates on the following salt: Maim is fed as previously described from the mill pocket 4 via the outlets 5 and the feeders 6 with the conveyor 7, after which it is relieved by means of the damper 8 on the screen 9. On the first half of the screen goods <20 mm are separated, while on the other semi-successively separates goods with a size of 20-60 frames, while only goods with a size> 60 mm pass over the distant spirit of the screen. Depending on the pH of the distributor slat 32 under the sieve can the freight fraction. 20-60 mm pour: or partly also the fraction is fed> 60 nun, whereby the amount of grinding stones that can be taken out can be continuously adapted to the needs of the stone grinding mill 21. In order to meet the needs of the stone grinding mill 21, only stones with a piece size> 60 mm can be accommodated, the distributor slat 32 is installed in its outer surface, the amount of grinding stones fed to the container 12 being regulated by the level jug. 13, the regulator 14 and the damper 8, as previously described.

Om .stenm.alningskvarnens 21 behov av malstenar icke kan tackas, Oxen om all maim matas till sikten 9 och fordelarspjallet 8 befirmer sig i sitt yttre andlage, fungerar anord.ningen pa foljande salt. If the need for grinding mills 21 of the grinding mill 21 cannot be met, the Taurus is fed to the screen 9 and the distributor slat 8 is in its outer capacity, the device operates on the following salt.

Nivakannaren 13 mater kontinuerligt laget av nivan av malstenar i behallaren 12. Om tillforseln av malstenar Over sikten 9 minskar pa grund av att malmen blivit finkornigare, sjmrker nivhn snabbare i behallaren 12, eftersom utmatningen genom oppningen 15 Or storre fin. tillforseln. Nivhkannaren 13, registrerar delta och ger signal till okning av uttagningen av malkroppar via regulatorn 14, som ger en impuls till fordelarspjallets drivanordning 35. Denna fir darvid sa kopplad, att den efter en dylik impuls for fardelarspjallet 32 in under sikten 9, sa att aven den grovre delen av gods mellan 20 och 60 nun uttas som malstenar. Forskjutningen av kolvstangen och det armed forenade spjallet 32 ,sker darvid lampligen med vissa forutbestamda installbara steg. Sedan det nya laget pa spjallet intagits, kommer en storre mangd malstenar att uttas, och nivan stravar darefter att stiga i behallaren 12. Skulle den gjorda omstallningen av den verksamma siktoppningen ha varit for liten, kommer nivan fortfarande att sjunka, varvid genom signal Iran nivakannaren 13 en fly omstallningsprocedur vidtager till ett nytt lage fordelarspjallet 32, anda tills detta svangts till silt innersta lage. Nar en omstallning fatt onskad effekt, tillfores en tillracklig kvantitet malsten till behallaren 12 for att nivan skall hallas konstant eller Oka. Om nivan akar avmates detfa med nivakannaren 13, och nfir nivfin natt sitt hogsta lage, ges hnyo impuls till omstallning av fordelarspjallet ph sá satt att den fores ett visst steg mot sitt ytterlage, varvid en. mindre mangd malsten uttages till fiekan 12. The level jug 13 continuously feeds the layer of grindstones in the container 12. If the supply of grindstones over the screen 9 decreases due to the ore becoming finer grained, the level darkens faster in the container 12, because the discharge through the opening 15 is greater fine. the supply. The level scanner 13 registers the delta and gives a signal for increasing the removal of grinding bodies via the regulator 14, which gives an impulse to the drive device 35 of the distributor slat. This is then connected so that after such a pulse it moves the splitter slat 32 under the screen 9, so that the coarser part of goods between 20 and 60 is now taken out as millstones. The displacement of the piston rod and the armed united damper 32, thereby, takes place suitably with certain predetermined installable steps. After the new layer on the damper has been taken in, a larger number of milestones will be removed, and the level will then struggle to rise in the container 12. Should the adjustment of the effective sight opening have been too small, the level will still decrease, whereby by signal Iran the level scanner 13 a flight conversion procedure takes to a new layer distributor slat 32, breath until it is pivoted to silt innermost layer. When a conversion has the desired effect, a sufficient quantity of grind is fed to the container 12 so that the level is kept constant or Oka. If the level akar is discharged with the level jug 13, and nfir nivfin night its highest layer, new impulse is given to rearrangement of the distributor dam ph so that it is carried a certain step towards its outer layer, whereby one. a small amount of malt is taken out to fiekan 12.

I det beskrivna exemplet anges halstorlekar mellan 60 oeh 20 mm, men uppfinningen Or givetvis ej begransad hartill; dessa matt aro angivna sasom vanligen forekommande gransvarden. In the example described, neck sizes are given between 60 and 20 mm, but the invention is of course not limited thereto; these matt aro are indicated as commonly occurring spruce.

I ,det beskrivna exemplet sker en anpassning av den uttagna malstensmangden rued hjalp av en enkeldackad sikt med i sin langdriktfling tilltagande halstorlek samt ett darunder verkande fordelarspjall. Sikten kan emellerlid enligt uppfinningen i stallet vara utford med dubbla dack med t. ex. halstorlekarna 60 och 20 ram ph Ovre resp. undre (Jacket; malstenarna besta dh forst och framst av gods >60 mm och om dessa ej ara tillrackliga kan medelst en spjallanordning, som i princip regleras pa samma salt som ovan beskrivits, st8rre eller min.dre mangd av gods mellan 20 och 60 mm, som uttages ph det undre dacket, till-f oras malstensfr aktionen. In the example described, an adjustment of the amount of grit taken out takes place with the aid of a single-deck sieve with an increasing neck size in its longitudinal flap and a distributor gap acting below it. The sight can, however, according to the invention in the stable be challenged with double decks with e.g. neck sizes 60 and 20 frame ph Upper resp. lower (Jacket; the millstones consist first and foremost of goods> 60 mm and if these are not sufficient, a larger or smaller amount of goods between 20 and 60 mm can be used by means of a splitter, which in principle is regulated on the same salt as described above. , which is taken out of the lower deck, the millstone fraction is added.

Det sistnamnda regleringssystemet ger, s0.som oven namnts, vissa fordelar gentemot det tidigare, i det att en mindre utjamningsbehallare 12 kan anvandas. Det ger vidare den fOrdelen, att malmen kan krossas till genomsnittligt finare storlek utan att brist uppstar av malsten till kvarnen 21. Della Or framforallt vasentligt vid malning av harda malmer, vid vilka man vill undvika att kora grov maim till stangkvarnen. Enligt systemet maste namligen all sa'dan grov maim, som icke kan tagas 2024 emot av stenkvarnen, ledas f8rbi malstensbehallaren och matas direkt till stangkvarnen. The latter control system provides, as mentioned above, certain advantages over the former, in that a smaller leveling container 12 can be used. It also has the advantage that the ore can be crushed to an average finer size without a shortage of gravel to the mill 21. Della Or is especially important when grinding hard ores, in which one wants to avoid coarse coarse grinding to the rod mill. According to the system, all such coarse maim, which cannot be received by the stone mill in 2024, must be led past the millstone container and fed directly to the rod mill.

Metoden är givetvis icke enbart begransad till vad som visats i beskrivningsexemplet. Betraffande storleken av utjamningsbehallaren 12, kan denna ges mycket varierande dimensioner. I aldre anldggningar, dal- foga utrymme finnes, efterstravas att Ora den sà liten som mojligt, och under gymisamma forhallanden torde dess volym icke behOva goras storre an \rad som kraves for att utjamna variationerna i malmens saminansattning under ett skiff. I nyanlaggningar daremot kan det vara lampligt att Ora malstensfickan betydligt storre, sa att den lian rymma en volym motsvarande ett genomsnittligt behov for flera dygn. The method is of course not only limited to what is shown in the description example. Regarding the size of the leveling container 12, this can be given very different dimensions. In older facilities, where there is room for space, efforts are made to keep it as small as possible, and in gym conditions its volume should not need to be made larger than is required to even out the variations in the composition of the ore under a shale. In new plants, on the other hand, it may be appropriate for the Ora millstone pocket to be considerably larger, so that it can hold a volume corresponding to an average need for several days.

I vissa fall kan det aven vara lampligt att mellan bandet 7, sikten 9 och kvarnen 17 anlagga en storre malmficka rymmande ett eller flera .dygns behov. In some cases, it may even be appropriate to place a larger ore pocket between one or more 24-hour needs between the belt 7, the screen 9 and the mill 17.

I det anforda exemplet liar visats vatmalning av maim i tvã steg, av vilket det forsta bestar i stangkvarnsraalning. Malschennat kan givetvis alien anpassas for malning i flera steg med stang- eller kulkvarnsmalning som primarmalning och ett eller" flera sekundara och tertiara/kvartara malsystem med malstenar, varvid dessa uttagas fran den krossade malmen och tillforas stenmalningskvarnen ph i princip liknande salt som beskrivits. In the example given, water grinding of maim is shown in two steps, the first of which consists of bar mill grinding. Grinding rails can of course be alien adapted for grinding in several steps with rod or ball mill grinding as primary grinding and one or more secondary and tertiary / quaternary grinding systems with grinding stones, these being taken from the crushed ore and fed to the stone grinding mill ph basically similar salt as described.

Claims

Patent claim:

1. Salt for stone grinding comprising one crushing step 1 fine crushing or a printer grinding step in a rod or ball mill followed by one or more fine grinding steps in a stone grinding mill or stone grinding mills, may require that the goods intended for grinding be crushed in its entirety into a primer or ball mill required piece size, and that from the salvage crushed goods the millstones intended for use in fine grinding in stone grinding mills are franchised.

2. Salt according to patent claim 1, characterized in that the whole quantity or a part of the crushed goods by sieving is divided partly into a pre-use such as millstones mainly coarse fraction, which after possible intermediate storage is charged in the stone grinding mill or stone grinding mills and partly in a substantially finer fraction completely or partially liberated from goods of a size required for use as grinding stones, which is first subjected to primary grinding and then fine grinding.

Salt according to claims 1-2, wherein the intended grinding stones are supplied to the stone grinding mill at such a rate that the motor power of the k-grinder Hiles at a predetermined value can be indicated by the fact that a deficit in the intended amount of grinding stones in relation to the current in the grinder the required amount of grindstones is compensated by sieving at a coarser size limit or that an excess is compensated by sieving at a finer size limit.

4. Device for sterilization according to the method claimed in the patent claim, consisting of a fine crusher (1) with a feeding device (6, 7) connected thereto for controllable supply of the crushed goods to subsequent grinding devices, consisting of a primal, mill (17), C. ex. a rod mill or ball mill or the like, and one or more stone grinding mills (21), intended for final fine grinding of the primed goods, Urine drawn from a grinder between the feeding device (6,, 7) and the primer mill (17) resp. (21) mounted distribution device (8) for installable division of the crushed goods into a fraction intended for inlet to the primary mill (17) and a fraction intended for removal of grindstones for the stone grinding mill or stone grinding mill, mama, (21); -. scheme (9) for separating fine goods_ from the latter fraction, n leveling container (12) for adjustable leveling of fluctuations in the feeding of grindstones to the stone grinding mill resp. the stone grinding mills, saint a feeder (16) arranged after the said leveling container (12) for food flaking of grinding stones in an adjustable amount to the stone grinding mill resp. the stone grinding mills (21).

Device according to claim 4, characterized in that the distribution device consists of a damper (8), arranged over a top of the primary mill (17) and collecting containers (10) opening into the denim.

Device according to patent claims 4 and 5, characterized in that the separating device consists of a screen (9) arranged over the container (10), the loading end of which is placed under the slat (8) and the unloading end of which opens over the leveling container (12).

7. Device according to patent claim 5, characterized in that the screen is provided with a screen cloth or screen plate with openings resp. which from one. minimum size at or near the pallet sand increase in size in the longitudinal direction of the screen.

8. A device according to claim 7, characterized in that substantially the first half of the screen, seen in the direction of the loading sand, is provided with openings of at least 62024 size, and that the remaining part of the screen has a halo, which successively increases in size in the direction towards the relief end.

Device according to any one of patent claims 4-8, characterized in that the separating device in addition to the screen (9) also comprises a distributor (32) which can be installed by means of manual or automatic actuators for cooperating with said screen, under the same screen. in a coarser fraction intended for use as grindstones and a finer fraction intended for primary grinding.

Device according to patent claim 9, characterized in that the distributor (32) consists of a partition wall such as installable between the leveling container (12) for the coarse goods (grindstones) and the collecting container (10) for the finer goods intended for the throttle (32). ), installable mainly within the area of the screen (9), which exhibits slippage, which, successively increase in size in the direction of the relief spirit.

11. Device according to any one of the preceding patent claims, characterized by a control device intended for in- & tanning air damper (8), consisting of one in the leveling container. (12) arranged, between a upper and a lower spruce layer installable level device (13) and a regulator (14) which can be actuated by pulses from this, arranged, in case of overfeeding air goods to the leveling container (12), to switch the damper (8) for reduced supply. to the leveling container (12), resp. in the event of underfeeding of goods, transfer the damper for increased supply to the leveling container.

Device according to one of the preceding patent claims, characterized by a control device (26-28) which can be actuated by the power of the stone grinding mill (21) for power-dependent installation of the air feeder (16).

13. Device according to claim 12, characterized in that the control device (26-28) consists of a power-sensing detection means (connected to the motor of the stone-milling mill (21) connected to the stone grinding mill (24) for continuous registration. 26), and an air this regulating means actuable power regulator15. (27), connected to a control switch (28) for the feeder (16) drive motor 29. Request publications: U.S. Patent Nos. 2,381,351.