EP0296585A2 - Method for separating crusts and substrates - Google Patents
Method for separating crusts and substrates Download PDFInfo
- Publication number
- EP0296585A2 EP0296585A2 EP88110019A EP88110019A EP0296585A2 EP 0296585 A2 EP0296585 A2 EP 0296585A2 EP 88110019 A EP88110019 A EP 88110019A EP 88110019 A EP88110019 A EP 88110019A EP 0296585 A2 EP0296585 A2 EP 0296585A2
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- European Patent Office
- Prior art keywords
- ores
- classified
- crusts
- substrates
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
- B03B1/02—Preparatory heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
Definitions
- the present invention relates to a method for separating crusts, especially cobalt-rich ferromanganese crusts and substrates, and more particularly to the terms and conditions on separation of the crusts and the substrates.
- Crusts are bedded sedimentary resources of sea bottom deposited on the surface of substrates, and valuable metal such as Co, Ni and Mn can be obtained by smelting those crusts. Actually, however, these substrates often mix with crusts when the crusts are mined. Mixing quantity of substrates affects greatly the cost of smelting. For this reason, it is required to separate mixed ores which have been mined into crusts and substrates at a stage before the process of smelting.
- the gravity separation is a method of separating and concentrating the ores by making use of difference of sedimentation rates in sea water, fresh water and other various liquid agents, due to specific gravity difference of ores and gangues. This method, however, is not generally applicable because the specific gravity difference between ores and gangues often is small enough to fail in guaranteeing an accurate and constant concentration.
- the floatation is a method wherein crusts are absorbed and separated by making use of difference of surface chemical properties which crusts and substrates respectively have. On land, most of copper ore deposits exist in the form of sulfide, and cobalt is recovered as a by-product of the main production of copper by making use of concentration through the floatation.
- the magnetic separation is a method wherein ores magnetized by powerful magnetic field are absorbed in the magnetic force and separated. But, the difference of the magnetic property between oxides of Co, Ni or the like and other metal compounds or non-metal compounds is so small that the application of this separation method is not satisfactory for concentrating crusts.
- the inventors proposed a method, in a Japanese Patent Application Laid Open No. 12381/88, as a related art, wherein crushing and classifying crusts and substrates are repeated to separate crusts and substrates.
- This method makes use of difference of brittleness of crusts and substrates, and of weak adhesiveness between crusts and substrates.
- the mixed ores are crushed into grains and the grains are selected out by a screen and classified into groups of different grain size. This method is comparatively simple, but the efficiency of the separation in this method is limited.
- the object of the present invention is to provide a method for separating crusts and substrates in high efficiency.
- a method for separating crusts and substrates comprising the steps of classifying mixed ores composed of crusts and substrates, as a first classification step, by at least one first classifier, into plurality of groups of classified ores; crushing each of the groups of the classified ores into plurality of groups of crushed ores by crushers equipped with heaters, each, while the classified ores are kept heated; and classifying each of the groups of the crushed ores as a second classification step, by at least one second classifier, thereby to separate the crusts and the substrates.
- a method for separating crusts and substrates comprising the steps of classifying mixed ores composed of crusts and substrates, as a first classification step, by at least one first classifier, into plurality of groups of classified ores; heating each of the groups of the classified ores by a heating apparatus; subsequently crushing each of the groups of the classified and heated ores, into plurality of grpuos of crushed ores; and classifying each of the groups of the crushed ores, by at least one second classifier, thereby to separate the crusts and the substrates.
- Fig. 1 graphically shows a relation of compressive strength of crusts to heating temperature.
- heating time is used for a parameter.
- the heating temperature is overwhelmingly a ruling factor, in comparison with the heating time.
- the strength remarkably goes down, and at 800°C or more, it is further reduced, but with lower reducing rate.
- the heating temperature ranges preferably 500° to 1,300°C. 800° to 1,000°C is more preferable.
- the compressive strength of substrates at high temperature is by far stronger than that of crusts shown in this graphic representation. Therefore, most of the substrates are not crushed so much during the heating and crushing process, and they remain as coarse grains or lumps. Consequently, if the classification is carried out after the heating and crushing process, separation of crusts and substrates can be easily attained.
- FIG. 2 schematically illustrates the principle forming a basis of the present invention.
- C mixed ores
- A crusts
- B substrates
- the mixed ores are crushed while kept heated or after having been heated, and subsequently classified, then, the mixed ores are separated into fine grains rich in crusts and coarse grains rich in substrates.
- a part of the substrates is crushed into grains almost equal to the fine grain size of the crushed crusts.
- the ratio, however, of fine grain size substrates included in the fine grains of the crushed crusts are by far smaller than in the case of the mixed ores being crushed at room temperature.
- Fig. 3 illustrates a flow diagram of an embodiment of the present invention.
- the present invention is preferably applicable to cobalt-rich ferromanganese.
- Referential numeral 1 denotes a first multistage classifier for classifying mixed ores composed of crusts and substrates in the first classification step, crushers 2a, 2b and 2c equipped with heaters, each, crushing the mixed ores which are kept heated to form crushed ores, and 3a,3b and 3c second classifiers classifying the crushed ores.
- the first classifier classifies the mixed ores into several groups of the mixed ores, by making use of grain size difference through screening, namely into three classes consisting of coarse grain ores, intermediate grain ores and fine grain ores in this embodiment.
- the first classifier of multistage can be alternated by plurality of single stage classifiers. Following the first classification step, the three different grain ores, each, are put into each of crushers 2a to 2c corresponding to the three different grain ores in size, and are crushed while kept heated.
- the coarse grain ores are put into crusher 2a, the intermediate grain ores into crusher 2b and the fine grain ores into crusher 2c.
- crusts included in the crushed ores become easier to be crushed than substrates as mentioned.
- the fine grains thereof are rich in crusts, while the coarse gains are rich in substrates.
- the heating temperature and the heating time are controlled, corresponding to kinds and grain sizes of the mixed ores.
- the ores crushed by each of crushers 2a to 2c are further transferred to second classifiers 3a to 3c. Coarse grains of the mixed ores crushed by crusher 2a are transferred to second classifier 3a. Similarly, intermediate grains and fine grains of the mixed ores, each, are tranferred to crushers 2b and 2c.
- the ores are classified through screening into fine grains rich in crusts and coarse grains rich in substrates. The fine grains are put into pulverizer 8 to be pulverized into particles, and then, the particles are transferred to the following step. In the meantime, in the case that a plenty of crusts are still included in the coarse grains, another concentrating method is applied to those crusts.
- Crushers 2a to 2c each, comprise cylindrical body 21 having crushing balls 25 of steel in the cylindrical body, a plurality of supporting rollers 22, burner 23 for heating the mixed ores inside the cylindrical body and driving unit 24 for driving a part of the supporting rollers.
- Cylindrical body 21 has a structure inserting heat insulating material 211 between inner cylinder 212 and outer cylinder 213 so as to prevent the heat insulating material from being damaged by an impact produced by dropping of crushing ball 25.
- Cylindrical body 21 has riding rings 26 fixed on its outer periphery and is supported by each of supporting rollers 22 through the riding rings.
- mixed ores introduced thereinto by means of hopper 27 are heated by combustion gas produced by burner 23, and, at the same time, are crushed by self-dropping work of the mixed ores and collision of the mixed ores and crushing balls 25 to form crushed ores. After the completion of the crushing, the crushed ores are discharged through exit hopper 28. It should be noted that when the mixed ores are sufficiently large and heating temperature is sufficiently high, crushing balls 25 are not necessarily required.
- the classification process can be simplified in view of their constitution.
- the classification can be effectively performed by a multi-step method as follows: when crusts and substrates included in the mixed ores which have been discharged out of second classifiers 3a and 3b processing coarse grains and intermediate grains are not satisfactorily separated, the mixed ores of undersize classified by second classifiers 3a and 3b can be again classified correspondingly in second classifiers 3b and 3c which process intermediate grains and fine grains to increase efficiency of concentrating.
- classifiers 3a,3b and 3c each, have three different mesh size screenings corresponding to large, intermediate and small mesh in descending order, and the classifiers are set at three different levels in the same order.
- a method is adopted, wherein heating mixed ores and crushing the same are simultaneously performed by a single apparatus of a crusher equipped with a heater.
- the heating and crushing process can be independently performed by a heating apparatus such as a high temperature drying furnace and by a crushing device.
- the mixed ores are heated by the heating apparatus, followed by the process of crushing the same, whereby the efficiency of the separation can be increased by means of controlling the heat temperature and the heating time, depending on kinds of the mixed ores.
- mixed ores of crusts and substrates are firstly classified by first classifier 1, and crushers 2a to 2c are set corresponding to levels of grain sizes.
- first classifier 1 the reason for providing three sets of second classifiers 3a to 3c is that the size distribution of grains of mixed ores crushed by crushers 2a to 2c is different, depending on their sizes and therefore, for example, in the case of taking size distribution of crust grains crushed by crusher 2a, most of crust grain sizes are larger than those crushed by crushers 2b and 2c.
- the crusher with a heater is used. But, in stead, the mixed ores are firstly heated by a heating apparatus (not shown), and subsequently crushed by a crusher which is not equipped with a heater.
- the method of the present invention as explained in the foregoing can be effectively incorporated into a crushing step of chloridation-roasting leach process and roasting sulfuration leach process, whereby an integrated process of smelting crusts with high efficiency can be obtained.
- the crusts discharged below the screening of the second classifiers were transferred to the following step of smelting the crusts.
- the substrates remaining on the screening were thrown away or sent to another process of concentrating the same.
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Disintegrating Or Milling (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Description
- The present invention relates to a method for separating crusts, especially cobalt-rich ferromanganese crusts and substrates, and more particularly to the terms and conditions on separation of the crusts and the substrates.
- Crusts are bedded sedimentary resources of sea bottom deposited on the surface of substrates, and valuable metal such as Co, Ni and Mn can be obtained by smelting those crusts. Actually, however, these substrates often mix with crusts when the crusts are mined. Mixing quantity of substrates affects greatly the cost of smelting. For this reason, it is required to separate mixed ores which have been mined into crusts and substrates at a stage before the process of smelting.
- As prior art methods of concentrating ores from gangues, (a) gravity separation, (b) floatation and (c) magnetic separation are known. Any of those, however, cannot be efficiently applied to concentrating crusts, more or less, due to the reasons mentioned below.
- The gravity separation is a method of separating and concentrating the ores by making use of difference of sedimentation rates in sea water, fresh water and other various liquid agents, due to specific gravity difference of ores and gangues. This method, however, is not generally applicable because the specific gravity difference between ores and gangues often is small enough to fail in guaranteeing an accurate and constant concentration. Secondly, the floatation is a method wherein crusts are absorbed and separated by making use of difference of surface chemical properties which crusts and substrates respectively have. On land, most of copper ore deposits exist in the form of sulfide, and cobalt is recovered as a by-product of the main production of copper by making use of concentration through the floatation. Since valuable metals contained in crusts, however, exist in the form of oxides, it is known that application of the floatation to oxides is difficult, compared to application of the same to sulfide. Therefore, the floatation is hard to apply to concentrating crusts. Thirdly, the magnetic separation is a method wherein ores magnetized by powerful magnetic field are absorbed in the magnetic force and separated. But, the difference of the magnetic property between oxides of Co, Ni or the like and other metal compounds or non-metal compounds is so small that the application of this separation method is not satisfactory for concentrating crusts.
- The inventors proposed a method, in a Japanese Patent Application Laid Open No. 12381/88, as a related art, wherein crushing and classifying crusts and substrates are repeated to separate crusts and substrates. This method makes use of difference of brittleness of crusts and substrates, and of weak adhesiveness between crusts and substrates. The mixed ores are crushed into grains and the grains are selected out by a screen and classified into groups of different grain size. This method is comparatively simple, but the efficiency of the separation in this method is limited.
- The object of the present invention is to provide a method for separating crusts and substrates in high efficiency.
- To attain the object, in accordance with the present invention, a method is provided for separating crusts and substrates comprising the steps of classifying mixed ores composed of crusts and substrates, as a first classification step, by at least one first classifier, into plurality of groups of classified ores; crushing each of the groups of the classified ores into plurality of groups of crushed ores by crushers equipped with heaters, each, while the classified ores are kept heated; and classifying each of the groups of the crushed ores as a second classification step, by at least one second classifier, thereby to separate the crusts and the substrates.
- Furthermore, a method is provided for separating crusts and substrates comprising the steps of classifying mixed ores composed of crusts and substrates, as a first classification step, by at least one first classifier, into plurality of groups of classified ores; heating each of the groups of the classified ores by a heating apparatus; subsequently crushing each of the groups of the classified and heated ores, into plurality of grpuos of crushed ores; and classifying each of the groups of the crushed ores, by at least one second classifier, thereby to separate the crusts and the substrates.
- The above object and other objects and advantages of the present invention will become apparent from the detailed description to follow, in conjunction with the appended drawings.
- Fig. 1 is a graphic representation showing a relation of compressive strength to heating temperature of crusts of the present invention;
- Fig. 2 is an explanatory representation illustrating a principle of the method of the present invention;
- Fig. 3 is an explanatory flow diagram of an embodiment of the present invention;
- Fig. 4 is a schematic view illustrating an embodiment of a crusher equipped with a heater used in the present invention; and
- Fig. 5 is an explanatory flow diagram of another embodiment of the present invention.
- With specific reference to the drawings, a preferred embodiment of the present invention will now be described. Fig. 1 graphically shows a relation of compressive strength of crusts to heating temperature. In this representation, heating time is used for a parameter. As clearly seen therefrom, the heating temperature is overwhelmingly a ruling factor, in comparison with the heating time. Furthermore, it is also seen that at a temperature of 500°C or more, the strength remarkably goes down, and at 800°C or more, it is further reduced, but with lower reducing rate. However, even if the temperature is raised to more than 1,000°C, the strength does not go down so much. Furthermore, when the temperature becomes more than 1,300°C, there is the possibility that heating equipment is in danger of losing heating resistance in the heating process. Consequently, the heating temperature ranges preferably 500° to 1,300°C. 800° to 1,000°C is more preferable.
- The compressive strength of substrates at high temperature is by far stronger than that of crusts shown in this graphic representation. Therefore, most of the substrates are not crushed so much during the heating and crushing process, and they remain as coarse grains or lumps. Consequently, if the classification is carried out after the heating and crushing process, separation of crusts and substrates can be easily attained.
- Referring specifically to Fig. 2, a principle of the present invention will now be explained, based on the aforementioned knowledge. Fig. 2 schematically illustrates the principle forming a basis of the present invention. When mixed ores (C) composed of crusts (A) and substrates (B) are heated, the crusts become so brittle that they can be crushed more easily than the substrates. Due to this reason, if the mixed ores are crushed while kept heated or after having been heated, and subsequently classified, then, the mixed ores are separated into fine grains rich in crusts and coarse grains rich in substrates. In this crushing process, a part of the substrates is crushed into grains almost equal to the fine grain size of the crushed crusts. The ratio, however, of fine grain size substrates included in the fine grains of the crushed crusts are by far smaller than in the case of the mixed ores being crushed at room temperature.
- Now, an embodiment of the present invention, based on the aforementioned principle will be given with specific reference to Fig. 3 of the drawing. Fig. 3 illustrates a flow diagram of an embodiment of the present invention. The present invention is preferably applicable to cobalt-rich ferromanganese.
Referential numeral 1 denotes a first multistage classifier for classifying mixed ores composed of crusts and substrates in the first classification step,crushers storage yard 4 are supplied intotransfer hopper 5 and the mixed ores are transferred fromhopper 5 to charging hopper 7 throughconveyor 6. Then, the mixed ores are introduced into the first classifier by means of hopper 7. The first classifier classifies the mixed ores into several groups of the mixed ores, by making use of grain size difference through screening, namely into three classes consisting of coarse grain ores, intermediate grain ores and fine grain ores in this embodiment. The first classifier of multistage can be alternated by plurality of single stage classifiers. Following the first classification step, the three different grain ores, each, are put into each ofcrushers 2a to 2c corresponding to the three different grain ores in size, and are crushed while kept heated. The coarse grain ores are put intocrusher 2a, the intermediate grain ores intocrusher 2b and the fine grain ores intocrusher 2c. In this crushing process, crusts included in the crushed ores become easier to be crushed than substrates as mentioned. Owing to these features of the crusts and substrates, among the ores thus crushed, the fine grains thereof are rich in crusts, while the coarse gains are rich in substrates. It is preferable that the heating temperature and the heating time are controlled, corresponding to kinds and grain sizes of the mixed ores. - The ores crushed by each of
crushers 2a to 2c are further transferred tosecond classifiers 3a to 3c. Coarse grains of the mixed ores crushed bycrusher 2a are transferred tosecond classifier 3a. Similarly, intermediate grains and fine grains of the mixed ores, each, are tranferred tocrushers pulverizer 8 to be pulverized into particles, and then, the particles are transferred to the following step. In the meantime, in the case that a plenty of crusts are still included in the coarse grains, another concentrating method is applied to those crusts. - As
crushers 2a to 2c, an apparatus composed of a rotary kiln with crushing balls or rods therein can be used. Fig. 4 illustrates an embodiment of the crushers equipped with heaters, each. Crushers 2a to 2c, each, comprisecylindrical body 21 having crushingballs 25 of steel in the cylindrical body, a plurality of supportingrollers 22,burner 23 for heating the mixed ores inside the cylindrical body and drivingunit 24 for driving a part of the supporting rollers. -
Cylindrical body 21 has a structure insertingheat insulating material 211 betweeninner cylinder 212 andouter cylinder 213 so as to prevent the heat insulating material from being damaged by an impact produced by dropping of crushingball 25.Cylindrical body 21 has riding rings 26 fixed on its outer periphery and is supported by each of supportingrollers 22 through the riding rings. In the cylindrical body, mixed ores introduced thereinto by means ofhopper 27 are heated by combustion gas produced byburner 23, and, at the same time, are crushed by self-dropping work of the mixed ores and collision of the mixed ores and crushingballs 25 to form crushed ores. After the completion of the crushing, the crushed ores are discharged throughexit hopper 28. It should be noted that when the mixed ores are sufficiently large and heating temperature is sufficiently high, crushingballs 25 are not necessarily required. - As shown in Fig. 3, if classification of the mixed ores is carried out independently by each of the second classifiers, the classification process can be simplified in view of their constitution. The classification can be effectively performed by a multi-step method as follows: when crusts and substrates included in the mixed ores which have been discharged out of
second classifiers second classifiers second classifiers classifiers - Furthermore, in this embodiment, a method is adopted, wherein heating mixed ores and crushing the same are simultaneously performed by a single apparatus of a crusher equipped with a heater. The heating and crushing process, however, can be independently performed by a heating apparatus such as a high temperature drying furnace and by a crushing device. In other words, the mixed ores are heated by the heating apparatus, followed by the process of crushing the same, whereby the efficiency of the separation can be increased by means of controlling the heat temperature and the heating time, depending on kinds of the mixed ores.
- In this embodiment, mixed ores of crusts and substrates are firstly classified by
first classifier 1, andcrushers 2a to 2c are set corresponding to levels of grain sizes. This is because impact required for crushing and heating time for elevating temperature upto a predetermined level are different, depending on grain sizes, and efficient heating and crushing can be procured. Besides that, the reason for providing three sets ofsecond classifiers 3a to 3c is that the size distribution of grains of mixed ores crushed bycrushers 2a to 2c is different, depending on their sizes and therefore, for example, in the case of taking size distribution of crust grains crushed bycrusher 2a, most of crust grain sizes are larger than those crushed bycrushers - Depending on kinds of mixed ores, heating temperature or heating time, even if the unit number of the second classifier is at least one but less than the number of groups the first classifier classifies, the efficiency of the separation of crusts and substrates and the yield do not always go down.
- In the
preferred embodiment 1 shown in Fig. 3, threecrushers first classifier 1. But, depending on kinds of the mixed ores, heating temperature and heating time, a method of the present invention can be carried out without using the first classifier. - Now, referring specifically to Fig. 5 of the drawing, another embodiment of the present invention will be described.
- Mixed ores stored in
storage yard 4 are supplied tocrusher 2 equipped with a heater. The mixed ores crushed bycrusher 2 are transferred tosecond classifier 3. In the second classifier, the ores are classified through screening into fine grains rich in crusts and coarse grains rich in substrates. - Furthermore, in this embodiment, as a crusher, the crusher with a heater is used. But, in stead, the mixed ores are firstly heated by a heating apparatus (not shown), and subsequently crushed by a crusher which is not equipped with a heater.
- The method of the present invention as explained in the foregoing can be effectively incorporated into a crushing step of chloridation-roasting leach process and roasting sulfuration leach process, whereby an integrated process of smelting crusts with high efficiency can be obtained.
- The present invention has advantages in that:
- (a) crusts and substrates can be very much efficiently separated and efficiency in smelting the crusts can be increased. This is because in the method, ores composed crusts and substrates are crushed during or after heating, followed by the process of crushing the ores by making use of a feature of crusts. The crusts, if once heated, become very much easy to be crushed in comparison with substrates; and
- (b) an integrated process of smelting crusts with high efficiency can be easily obtained by incorporating the steps of the separation method of the present invention in the prior art processes of the chloridation-roasting-leach process and the roasting-sulfuration-leach process.
- Mixed ores of crusts and substrates consisting of 20% of less than 30mm, 60% of 30 to 50mm and 20% of more than 50 but 100mm or less in grain size were classified by
first classifier 1 respectively into three groups of fine, intermediate and coarse grains. These three grains were put into each ofrotary kilns second classifiers - The crusts discharged below the screening of the second classifiers were transferred to the following step of smelting the crusts. The substrates remaining on the screening were thrown away or sent to another process of concentrating the same.
Claims (18)
classifying mixed ores (C) composed of crusts (A) and substrates (B), as a first classification step, by at least one first classifier (1), into plurality of groups of classified ores; and
classifying each of the groups of the crushed ores, as a second classification step, by at least one second classifier (3a,3b,3c) thereby to separate the crusts (A) and the substrates (B),
characterized by crushing each of the groups of the classified ores into plurality of grounds of crushed ores by crushers (2a,2b,2c) equipped with heaters (23), each, whole the classified ores are kept heated.
classifying mixed ores (C) composed of crusts (A) and substrates (3), as a first classification step, by at least one first classifier (1), into plurality of groups of classified ores; and
classifying each of the groups of the crushed ores, by at least one second classifier (3a,3b,3c), thereby to separate the crusts (A) and the substrates (B),
characterized by heating each of the groups of the classified ores by a heating apparatus (23); and
subsequently crushing each of the groups of the classified and heated ores into plurality of groups of crushed ores.
classifying the crushed ores, thereby to separate the crusts (A) and the substrates (B),
characterized by crushing mixed ores (C) composed of crusts (A) and substrates (B) into crushed ores while the mixed ores (C) are kept heated.
classifying the crushed ores, thereby to separate the crusts (A) and the substrates (B),
characterized by heating mixed ores (C) composed of crusts (A) and substrates (B); and
subsequently crushing the mixed ores (C) heated into crushed ores.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP155430/87 | 1987-06-24 | ||
JP15543087A JPS644266A (en) | 1987-06-24 | 1987-06-24 | Separation of crust and mother rock |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0296585A2 true EP0296585A2 (en) | 1988-12-28 |
EP0296585A3 EP0296585A3 (en) | 1990-04-11 |
Family
ID=15605845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88110019A Withdrawn EP0296585A3 (en) | 1987-06-24 | 1988-06-23 | Method for separating crusts and substrates |
Country Status (2)
Country | Link |
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EP (1) | EP0296585A3 (en) |
JP (1) | JPS644266A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3016239B2 (en) * | 1992-03-24 | 2000-03-06 | 三菱マテリアル株式会社 | Recovery method of coarse aggregate from concrete waste |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR718751A (en) * | 1931-06-17 | 1932-01-28 | Enrichment processes for oolitic iron ores and in particular iron ores from eastern France | |
US2772775A (en) * | 1953-03-02 | 1956-12-04 | Int Minerals & Chem Corp | Treatment of sylvinite ore |
GB1242444A (en) * | 1967-08-21 | 1971-08-11 | Mines D Anderny Chevillon Soc | Improvements in or relating to methods of enriching valuable raw materials |
US4468847A (en) * | 1982-08-31 | 1984-09-04 | Aluminum Company Of America | Method of segregating metallic components |
US4624416A (en) * | 1982-02-02 | 1986-11-25 | Oy Partek Ab | Procedure for classifying a crystal mixture or concentrating rocks or mixed crystals in particle form |
JPH06312381A (en) * | 1993-04-27 | 1994-11-08 | Uriyuu Seisaku Kk | Method of managing screw fastening work for toque wrench |
-
1987
- 1987-06-24 JP JP15543087A patent/JPS644266A/en active Pending
-
1988
- 1988-06-23 EP EP88110019A patent/EP0296585A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR718751A (en) * | 1931-06-17 | 1932-01-28 | Enrichment processes for oolitic iron ores and in particular iron ores from eastern France | |
US2772775A (en) * | 1953-03-02 | 1956-12-04 | Int Minerals & Chem Corp | Treatment of sylvinite ore |
GB1242444A (en) * | 1967-08-21 | 1971-08-11 | Mines D Anderny Chevillon Soc | Improvements in or relating to methods of enriching valuable raw materials |
US4624416A (en) * | 1982-02-02 | 1986-11-25 | Oy Partek Ab | Procedure for classifying a crystal mixture or concentrating rocks or mixed crystals in particle form |
US4468847A (en) * | 1982-08-31 | 1984-09-04 | Aluminum Company Of America | Method of segregating metallic components |
JPH06312381A (en) * | 1993-04-27 | 1994-11-08 | Uriyuu Seisaku Kk | Method of managing screw fastening work for toque wrench |
Also Published As
Publication number | Publication date |
---|---|
EP0296585A3 (en) | 1990-04-11 |
JPS644266A (en) | 1989-01-09 |
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