Single magnetic ore
Single magnetic ore is mainly embedded in fine grains. Gangue minerals are mainly silicate minerals such as quartz and hornblende, some of which contain more iron silicate. To dress this kind of iron ore, the low intensity magnetic separation method is usually adopted. To further obtain high grade concentrate, the magnetic concentrate is treated by reverse flotation or high frequency screen. In areas lacking water, dry grinding and magnetic separation are used. When the rich magnetic ore or p...
Polymetallic and magnetic iron ore
The polymetallic and magnetic iron ore is mainly sulfur magnetite and a few phosphorous magnetite. The magnetite in the ore is embedded with medium to fine grain. Gangue has silicate or carbonate minerals, often accompanied by pyrite, cobalt pyrite or chalcopyrite, and apatite. In the process of low intensity magnetic separation followed by flotation, the interlocked minerals mainly enter the iron concentrate. While flotation followed by low intensity magnetic separation, the interlocked mine...
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Single weakly magnetic iron ore
The single weakly magnetic iron ore consists of hematite, siderite, limonite, and hematite in sedimentary and metamorphic, sedimentary, hydrothermal, and weathered deposits. Different kinds of iron ores Due to the variety of minerals and grain sizes, there are also many single weakly magnetic iron ore dressing methods. The commonly used method is magnetization calcination magnetic separation or a combined process with one of gravity separation, flotation, and strong magnetic separation, and c...
Polymetallic and weakly magnetic iron ore
This kind of ore is often embedded with particles, and closely commensal with gangue in an olite texture, which is difficult to dissociate. Therefore, iron minerals in this kind of ores are generally recovered by gravity separation, flotation, strong magnetic separation, or combined processes, and phosphorus or sulfide are recovered by flotation. 1. If it is a rich ore or a self melting ore, the gangue can be removed through dense medium separation, jigging, or dry strong magnetic separation,...
Single commensal iron ore
The single commensal iron ore is mainly combined with hematite and magnetite or magnetite and siderite. In this kind of iron ore, magnetite, hematite, and siderite are mostly embedded finely. Commensal iron ore There are two common dressing methods for this kind of iron ore: Combining low intensity magnetic separation with gravity separation, flotation, and strong magnetic separation When the low intensity magnetic separation combines with gravity magnetic separation, flotation, and strong ma...
Polymetallic commensal iron ore
The polymetallic commensal iron ore is mainly formed of magnetite and hematite or siderite, which are embedded in medium to fine grains. Its gangue rocks include silicate and carbonate minerals or jadeite, etc. And the commensal components are apatite, pyrite, chalcopyrite, and rare earth minerals. Polymetallic commensal iron ore The beneficiation method of this kind of ore is the most complex among all kinds of iron ores. Generally, the combined process of weakly magnetic separation and othe...
Factors Affecting Ore Dressing Equipment PurchaseFirst, customers should take production capacity into account. Price gets higher with larger capacity.Second...
The fact that a product of high value and small bulk can be produced at a gold mine, often by relatively simple milling processes, has made it possible to operate gold mines successfully in remote and inhospitable regions where high costs of transportation, fuel, and power would make it impossible to exploit profitably base metal ores of equal dollar value. As a result, in many instances gold mine development has been the advance guard of civilization in regions where other mineral resources were developed later and agriculture and industry followed.
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In the milling of gold ores, as with other kinds of ores, the treatment that will give the best metallurgical and economic results in any particular instance is determined primarily by the character of the ore, although other factors previously mentioned must be considered also. The principal ore characteristics that govern the selection of the milling method are grade of ore and uniformity of tenor, the size of the gold particles, the nature of the associated minerals, and the degree to which the gold particles are locked within them. The details of the process also will be determined by these characteristics and to a considerable extent by the crushing and grinding qualities of the ore. Ores of very low grade usually can be exploited successfully only when treated on a large scale in plants of high capacity, which involve heavy initial capital outlay. Higher grade ores may be treated profitably in smaller plants with lower initial outlay per dollar of output, unless the ore is ref...
There are two principal methods of amalgamationplate amalgamation and barrel amalgamation. In plate amalgamation the ore is crushed wet in stamp mills or ground in ball mills and the resulting pulp flows over copper plates , which are coated with amalgam and mercury. Particles of free gold and silver coming in contact with the mercury alloy with it to form gold silver amalgam, which adheres to the plates. Where stamps are employed, the screen openings range from about 12 to 40 mesh as a rule, which determines the maximum size of ore particles in the pulp passing over the plates. Mercury sometimes is introduced into the stamp mortar, also, especially if there is much coarse free gold in the ore. The plates are dressed every few hours, the interval depending on the grade of the ore, amount of sickening that takes place, the scouring action of the pulp, and degree of discoloration of the plates by chemical action. Dressing usually comprises brushing the plates from the...
Concentration is employed for the purpose of segregating the gold in a product of relatively small bulk for direct shipment to a smelter or for further treatment in the mill. For many years gravity concentration was virtually the only concentrating method employed in gold mills, but in recent years flotation methods have been used widely, especially in the flow sheets of new mills. As an adjunct to other methods, concentration may effect marked savings in operating costs. Thus, it is often possible to produce a concentrate containing most of the gold after relatively coarse grinding, then fine grind the concentrate preparatory to extracting the gold by cyanidation or amalgamation. Since fine grinding usually is the most costly operation in gold milling, it is obvious that where it can be restricted to a concentrate, the bulk of which is only a fraction of that of the original ore, the saving in cost is appreciable. Furthermore, the constituents of t...
The cyanide process is based on the work of MacArthur and the Forrests and involves the leaching of gold and silver from alkaline pulps with dilute solutions of sodium or potassium cyanide, the filtering and clarification of the gold silver bearing solution, and precipitation of metals from solution. Oxygen is essential to the solution reaction, and in practice oxygenation is accomplished by violent agitation of the pulp by the injection of compressed air. Precipitation usually is by means of zinc shavings or zinc dust and is improved if the solution be first de aerated. Aluminum is used instead of zinc under some unusual conditions. Nearly all gold ores are amenable to cyanidation, although, as previously pointed out, certain constituents of some ores cause excessive consumption of cyanide and other reagents, or the fouling of solutions, with resultant high costs. A few are so difficult to treat by direct cyanidation that costly preliminary treatment must be employe...
The data in table 57 have been obtained from various sources as noted. In view of the frequent changes in practice that take place in most mills due to changes in ore characteristics, in methods and equipment brought about by research and improved machines, and increases or decreases in capacity, these data should be understood to apply specifically to the period covered and only generally to long time operations. However, they represent broadly current practices and results obtained in milling various types of gold ores.
The ore dressing. The aim of ore dressing is increasing the concentration of iron in the ore by removing the unwanted impurities and improve the properties of the ore which helps in the successive stages of extraction, The ore dressing process is carried out to improve the physical and mechanical properties of iron ore and includes Crushing process, Sintering process, Purification and ...
When the iron ore is extracted from the mine, it must undergo several processing stages. Six steps to process iron ore. 1. Screening. We recommend that you begin by screening the iron ore to separate fine particles below the crushers CSS before the crushing stage. A static screen is used to divert the fine particles for crushing.
Iron is one of the most important metals in mechanical engineering, as it is present in sufficient quantities on earth. The extraction of iron can therefore be very economical. However, pure iron is not suitable for use as a construction material. It is much too soft in its pure form and has too little strength to meet most mechanical requirements. For this reason, it is necessary to use alloying additives to give the iron its hardness and strength. It has been shown that carbon is an excellent alloying element. Within certain limits, carbon has a very high strength and hardness increasing effect and is very cheap compared to other alloying elements. Such a compound of iron and carbon is generally referred to as steel, where the carbon content is less than 2 %. The special importance of steel in mechanical engineering is already demonstrated by the daily production of around 4 million tons of steel! Steel is an alloy of iron and carbon, with a maximum carbon content of 2 %! Basicall...
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Iron does not occur in nature as a pure substance but as a compound in rocks, which can contain up to 50 % iron. These ferrous rocks are also called iron ores. The iron compounds contained therein are mainly iron oxides, but also iron carbonates or iron sulphides. The most important iron oxides include: 1. magnetite: Fe3O4 2. hematite : Fe2O3 3. siderite: FeCO3 4. limonite: 2Fe2O3H2O The iron itself is removed from these iron oxides in the subsequent blast furnace processand processed into steel in combination with carbon. Iron ores are mixtures of ferreous compounds and other undesirable elements! In addition to the actual iron compounds, however, the iron ore always contains various admixtures, which are not of interest for steel production. These waste rocks are also referred to as gangueand are often oxides such as, for example: 1. silicon dioxide 2. manganese oxide 3. calcium oxide 4. magnesium oxide 5. aluminium oxide 6. phosphor...
After the iron ore has been prepared by crushing and grinding during ore extraction, the ore is actually processed. The aim of this is to reduce the undesirable high proportion of admixtures to a desired minimum in order to increase the iron content. This is done by processes such as flotation or magnetic separation. Subsequently, the milled ores are lumped by sintering or pelletizing in order to optimize chemical reactions in the blast furnace process. Ore processing is the separation of iron ore from gangue in order to optimize the blast furnace process! In principle, the undesirable gangue can never be completely separated from the iron ores during ore dressing. This means that a certain amount of unwanted elements always enters the blast furnace process. Slag forming aggregates are then used to separate these unwanted substances during or after the blast furnace process.
After processing the iron ore in froth flotation cells or magnetic separators, the finely ground ores cannot be fed directly to the blast furnace, as the enormous compression due to the charging in the blast furnace would impede gas flow. The ores must therefore be made lumpy so that there are sufficient cavities in the charging column for a good gas flow through. The lumpy pieces are made by sintering and pelletizing. Baking ground ore into lumpy, porous pieces is necessary to improve chemical reactivity! During sintering, the fine ores are first mixed with additives and fine coke. This mixture then passes through a funnel onto a circulating moving grate. Ignition flames then set the mixed coke on fire. Due to the high temperatures, the ores bake together to a sinter cake . Air vents provide a suction effect so that the sinter cake actually bakes together over the entire cross section. Afterwards, the porous sinter cake is broken to grain size...
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Dressing Ways for 3 Kinds of Iron Ore Make You Profitable ...
Single magnetic ore
Single magnetic ore is mainly embedded in fine grains. Gangue minerals are mainly silicate minerals such as quartz and hornblende, some of which contain more iron silicate. To dress this kind of iron ore, the low intensity magnetic separation method is usually adopted. To further obtain high grade concentrate, the magnetic concentrate is treated by reverse flotation or high frequency screen. In areas lacking water, dry grinding and magnetic separation are used. When the rich magnetic ore or p...
Polymetallic and magnetic iron ore
The polymetallic and magnetic iron ore is mainly sulfur magnetite and a few phosphorous magnetite. The magnetite in the ore is embedded with medium to fine grain. Gangue has silicate or carbonate minerals, often accompanied by pyrite, cobalt pyrite or chalcopyrite, and apatite. In the process of low intensity magnetic separation followed by flotation, the interlocked minerals mainly enter the iron concentrate. While flotation followed by low intensity magnetic separation, the interlocked mine...
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Single weakly magnetic iron ore
The single weakly magnetic iron ore consists of hematite, siderite, limonite, and hematite in sedimentary and metamorphic, sedimentary, hydrothermal, and weathered deposits. Different kinds of iron ores Due to the variety of minerals and grain sizes, there are also many single weakly magnetic iron ore dressing methods. The commonly used method is magnetization calcination magnetic separation or a combined process with one of gravity separation, flotation, and strong magnetic separation, and c...
Polymetallic and weakly magnetic iron ore
This kind of ore is often embedded with particles, and closely commensal with gangue in an olite texture, which is difficult to dissociate. Therefore, iron minerals in this kind of ores are generally recovered by gravity separation, flotation, strong magnetic separation, or combined processes, and phosphorus or sulfide are recovered by flotation. 1. If it is a rich ore or a self melting ore, the gangue can be removed through dense medium separation, jigging, or dry strong magnetic separation,...
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Single commensal iron ore
The single commensal iron ore is mainly combined with hematite and magnetite or magnetite and siderite. In this kind of iron ore, magnetite, hematite, and siderite are mostly embedded finely. Commensal iron ore There are two common dressing methods for this kind of iron ore: Combining low intensity magnetic separation with gravity separation, flotation, and strong magnetic separation When the low intensity magnetic separation combines with gravity magnetic separation, flotation, and strong ma...
Polymetallic commensal iron ore
The polymetallic commensal iron ore is mainly formed of magnetite and hematite or siderite, which are embedded in medium to fine grains. Its gangue rocks include silicate and carbonate minerals or jadeite, etc. And the commensal components are apatite, pyrite, chalcopyrite, and rare earth minerals. Polymetallic commensal iron ore The beneficiation method of this kind of ore is the most complex among all kinds of iron ores. Generally, the combined process of weakly magnetic separation and othe...
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