RU2311232C2 - Method of reprocessing of the cobalt-bearing iron-manganese ocianic formations (versions) - Google Patents

Abstract

FIELD: mining industry; methods of the minerals concentration.

SUBSTANCE: the invention is pertaining to the field of the minerals concentration and may be used at reprocessing of the cobalt-bearing iron-manganese oceanic formations (crusts and concretions) extracted from the bottom of the world ocean and containing besides manganese, cobalt and iron also the nickel, copper, noble and rare metals. The method of reprocessing of the cobalt-bearing iron-manganese oceanic formations includes crushing, grinding, grading and the subsequent separation of manganese and the nonferrous metals. The first version of the method provides, that after the grading from the fraction of 0.5÷0.074 mm exercise extraction of the manganese and the nonferrous metals by the gravity concentration on the table concentrator with the subsequent three-stage magnetic separation of the light fraction of the table concentrator. At that the intensity of the magnetic field of the separator on the first stage compounds from 3500 up to 4000 oersted, on the second stage - from 6500 up to 7200 oersted and on the third stage - from 8000 up to 8200 oersted. At that the manganese and the nonferrous metals are extracted into the magnetic fraction of the third stage. The second version of the method provides, that the grading is exercised for the fraction of 12÷0.5 and 0.5÷0.074 mm, and separation of the manganese and the nonferrous metals is exercised from the received fractions by the gravity concentration on the settling machines from the fraction of 12÷0.5 mm and on the table concentrators from the fraction of 0.5÷0.074 mm. At that the manganese and the nonferrous metals are extracted into the light fractions of the gravity concentration, which are routed to the chemical-metallurgical finishing. The cycle of reprocessing for the both versions of the method is exercised in the module on the ocean floor. The technical result of the invention is the increased share of the manganese extracted into the joint concentrate of manganese, cobalt, nickel and copper, the improved world ocean floor environmental ecology, the reduced volume of the material lifted from the ocean floor.

EFFECT: the invention ensures the increased share of the manganese extracted into the joint concentrate of manganese, cobalt, nickel and copper, the improved world ocean floor environmental ecology, the reduced volume of the material lifted from the ocean floor.

2 cl, 2 dwg, 2 tbl

Description

The invention relates to the field of mineral processing and can be used in the processing of cobalt-rich iron-manganese oceanic formations mined from the bottom of the oceans and containing, in addition to manganese, cobalt and iron, nickel, copper, precious and rare metals. Among the minerals of the ocean, cobalt-rich iron-manganese crust formations (KZHMK) are an independent industrial ore type, which is of great economic and political importance.

A known method of processing formations (KZHMK), including grinding, reducing roasting and hydrometallurgical processing of raw materials to produce manganese, cobalt and nickel (see "Geology and mineral resources of the oceans, Intermorgeo, Warsaw, 1990, pp.646-648"). The disadvantage of this method is the significant energy costs for firing and drying the source of crushed material, as well as the need to process 100% of the mass of material by chemical-metallurgical technology.

The closest in technical essence and the achieved result to the described inventions is a method for processing cobalt-rich iron-manganese oceanic formations, including crushing, grinding, classification and subsequent separation of manganese and non-ferrous metals (see Russian Patent No. 2261923, class C22B 3/08 of 31.05 .2004).

The disadvantages of this method include the low technological parameters of the process and the need to involve in the processing of the entire mass of the source material.

The technical task of the invention is to create a technology for processing cobalt-rich iron-manganese oceanic formations based on preliminary deep enrichment with the production of collective concentrate for the subsequent chemical-technological process with a decrease in its weight by 2.5-3 times.

The stated technical problem is solved in such a way that in the method for processing cobalt-rich iron-manganese oceanic formations according to option I, including crushing, grinding, classification and subsequent separation of manganese and non-ferrous metals, the latter is carried out by preliminary gravitational enrichment on a concentration table from the -0.5+ fraction 0.074 mm followed by a three-stage magnetic separation of the light fraction of the concentration table, while the magnetic field of the separator in the first stage was It has from 3,500 to 4,000 oersteds, in the second from 6,500 to 7,200 oersteds and in the third from 8,000 to 8,200 oersteds, and manganese and non-ferrous metals are extracted into the magnetic fraction of the third stage.

In the method for processing cobalt-rich iron-manganese oceanic formations according to option II, including crushing, grinding, classification and subsequent separation of manganese and non-ferrous metals, the latter is carried out by preliminary gravitational enrichment on jigging machines from the -12 + 0.5 mm fraction and on concentration tables from the fraction -0.5 + 0.074 mm, while manganese and non-ferrous metals are extracted into the light fractions of gravitational enrichment, which are sent to chemical-metallurgical refinement.

The processing process according to options I and II is carried out in a module on the ocean floor.

The invention consists in the following:

After the operation of crushing, grinding and classification, each class of fineness of the source material is fed to gravity enrichment using the concentration process on the KTs-30 table with a purification of concentrates and control tailings enrichment. In this case, substrate minerals pass into the heavy fraction, and minerals with a high content of manganese and non-ferrous metals go into the light fraction (table tails).

The results of gravitational enrichment of the classified material on the concentration table allow us to draw the following conclusions:

- the extraction of manganese (and, accordingly, non-ferrous metals) into the light fraction of the concentration table, directed to magnetic separation, with the enrichment of all three classes is high (78-81%), however, with a decrease in grinding fineness, the degree of concentration of valuable components decreases from 20 to 11%;

- when enriching large classes (0.5 + 0.3 mm.) and (-0.3 + 0.15 mm), the product (end tails of the concentration table) enriched with manganese (and, accordingly, cobalt and other non-ferrous metals) is almost two times richer than the original when the iron content is at the level of the original;

- during the enrichment of the small class (-0.15 + 0.044 mm), there is only a slight increase in the manganese content in the light fraction of the concentration table by 3-4% compared to the starting material;

- when developing a schematic diagram of the enrichment of the source material, it is recommended that a wider class -0.5 + 0.074 mm be sent to the concentration table.

The subsequent process of magnetic separation is carried out within the magnetic field from 3500 to 8200 Oersted in three stages. When conducting studies at each size class, it was established that light minerals of the substrate phase are released into the nonmagnetic fraction, and ferruginous formations with a low content of manganese and non-ferrous metals are separated into a weakly magnetic fraction (from 3500 to 5000 oersted), into a weakly magnetic fraction (from 7200 to 8200 Oersted) - a product rich in manganese and non-ferrous metals.

An analysis of the results of the three-stage magnetic separation of the enriched products of the concentration table (by particle size) allows us to establish the following:

- in the range of the magnetic field of the separator from 3500 to 5500 Oersted, it was possible to isolate tailings containing manganese and non-ferrous metal from 3.2 to 5.4% manganese (magnetic fraction) with low losses of valuable components from all three classes of particle size ( 0.7-2.0% of ore);

- non-magnetic fractions from all classes of fineness are tailings with a manganese content of from 1.5 to 3.0%, with the loss of valuable components in them (0.1 to 0.5% of ore);

- an intermediate manganese product with a content of 10.6% manganese and non-ferrous metals 1.5% (from ore) was isolated from the class -0.5 + 0.3 mm in the magnetic separator tension range from 5500 to 7200 Oersteds;

- in the range of magnetic separator tension from 7200 to 8200 oersted, the richest manganese and non-ferrous metal product (low-magnetic fraction) with an average manganese content of 20% and cobalt 0.53% was extracted with 65-70% of ore, respectively, sent to chemical metallurgical processing.

As a result of the studies, it was found that with a certain mineral composition of oceanic cortical formations (the absence of weakly magnetic manganese minerals), manganese and non-ferrous metals are extracted from the -12 + 0.5 mm fraction by gravitational enrichment on depositing machines, and from the fraction -0.5 + 0.074 mm - on concentration tables, while manganese and non-ferrous metals are extracted into the light fractions of gravitational enrichment (II variant).

In order to reduce by 3.5–4.0 times the volume of the material raised from the bottom of the ocean and enriched material containing manganese and non-ferrous metals for the subsequent chemical and metallurgical process, as well as to reduce the environmental tension of the bottom of the World Ocean, the processing of the source material in both options is carried out in the module at the bottom of the ocean.

An example of a specific implementation of the invention is illustrated with reference to graphic material, where figure 1 shows a diagram and the main parameters of the processing processes of cobalt-rich ferromanganese oceanic formations (option I).

The studies were performed on a representative sample containing 10.5% manganese, 0.27% cobalt, 0.24% nickel and 0.08% copper. After crushing, grinding and classification operations, a fraction of -0.5 + 0.074 mm was supplied to preliminary gravity concentration using a concentration table. The light fraction of the concentration table entered the three-stage magnetic separation, while the magnetic field strength in the first stage was 3500-4000 Oersted, in the second - 6500-7200 Oersted and in the third - 8000-8200 Oersted. As a result of the three-stage magnetic separation, manganese and non-ferrous metals are extracted into the magnetic fraction in the third stage.

Table 1 shows the data confirming the validity of the described invention - a method for processing cobalt-rich ferromanganese oceanic formations (according to the first embodiment) in comparison with the analogue and prototype (experiments 1 and 2). An analysis of the results shows that only under optimal conditions of the described method (experiments 3, 4, 5), a high extraction of manganese (63-67%), cobalt (63-69%), nickel (77-90%) and copper (56-61%) with a minimum yield of 30-35% (by weight) entering chemical-metallurgical refinement to marketable products. When you go beyond the lower limits of optimal values (experiment 6 and 9), the technological indicators significantly decrease, and when you go beyond the upper limits (experiments 7 and 8) they practically do not change.

In the second embodiment, an example of a specific implementation of the invention is explained with reference to the drawings, in which Fig. 2 shows a diagram of the processing of cobalt-rich iron-manganese oceanic formations (in the same sample as in the first embodiment). After crushing, grinding and classification operations, a fraction of -12 + 0.5 mm was sent to gravity enrichment by the deposit method, and a fraction of -0.5 + 0.074 mm to a concentration table. As a result of the enrichment process, manganese and non-ferrous metals are extracted into the light fractions of gravitational methods.

Table 2 shows the data confirming the validity of the described invention - a method for processing cobalt-rich iron-manganese oceanic formations (according to the second option) in comparison with the analogue and prototype (experiments 1 and 2). An analysis of the results shows that only under optimal conditions of the described method (experiments 3) is a high extraction of manganese (63.8%), cobalt (66.0%), nickel (86.6%) and copper (57, 7%) with a minimum yield of 33% (by weight) entering chemical-metallurgical refinement to marketable products.

Thus, the use of the described invention solves the problem of complex processing of cobalt-rich iron-manganese oceanic formations due to the high extraction of manganese, cobalt, nickel and copper into a collective concentrate fed to chemical-metallurgical processing to marketable products, while reducing its yield (by weight) up to 30-35%

Table 1
Comparative results of the processing of cobalt-rich iron-manganese oceanic formations by analogue, prototype and invention (option 1) Experience No. 1 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 80.0 12.0 0.29 0.26 0.19 95.5 85.9 86.7 90.0 By analogue method Tails 20,0 2.25 0.19 0.16 0.04 4,5 14.1 13.3 10.0 Sludge 0 0 0 0 0 0 0 0 0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 2 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 64.0 14.0 0.32 0.29 0.1 85.3 75.9 77.3 80.0 According to the prototype method Tails 19.0 5.7 0.25 0.20 0.05 4.3 6.7 6.5 7.0 Sludge 7.0 6.5 0.26 0.24 0.08 10,4 17.4 16,2 13.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 3 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 33.0 20,0 0.56 0.61 0.15 62.9 68,4 84.0 61.9 According to the proposed method, Fraction -0.5 + 0.044
In the first stage 3500 oersted
In the second stage 6500 oersted
In the third stage, 8,000 oersteds Tails 37.0 4.6 0.10 0.02 0.02 16,2 13.8 14.7 8.1 Sludge 30,0 7.3 0.16 0.10 0.08 20.9 17.8 1.3 30,0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0

Continuation of table 1 Experience No. 4 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 35 19.6 0.53 0.62 0.13 66.1 68.7 90,4 56.88 According to the proposed method, Fraction -0.5 + 0.044
In the first stage 3800 oersted
On the second station 6800 oersted
In the third stage, 8,100 oersteds Tails 38 4.2 0.09 0.05 0.04 15.1 12.6 7.91 19.0 Sludge 27 7.8 0.19 0.18 0.08 18.8 18.7 1,69 24,125 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 5 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 31,0 22.7 0.55 0.63 0.14 67.0 63.1 81.4 54,2 According to the proposed method, Fraction -0.5 + 0.044
In the first stage 4000 oersted
In the second stage 7200 oersted
In the third stage, 8200ersted Tails 40,0 4.0 0.15 0.02 0,03 15,2 21.9 4.1 16.8 Sludge 29.0 6.4 0.14 0.12 0.08 17.8 15.0 14.5 29.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 6 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 40,0 16,4 0.45 0.53 0.11 62.5 66.7 88.3 55.0 According to the proposed method, Fraction -0.5 + 0.044
At the first stage 3400 oersted
In the second stage 6400 oersted
In the third stage, 7900 oersted Tails 38,0 6.0 0.16 0.02 0.05 21.6 22.7 2,5 23.0 Sludge 22.0 7.6 0.13 0.10 0.08 15.9 10.6 9.2 22.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0

Continuation of table 1 Experience No. 7 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 32,0 19.8 0.51 0.58 0.13 60.3 60,4 77.3 52.0 According to the proposed method, Fraction -0.5 + 0.044
At the first stage 4100 oersted
In the second stage 7300 oersted
In the third stage, 8300 oersted Tails 37.0 4.4 0.14 0,03 0.04 15,5 18.9 4.6 17.0 Sludge 31,0 8.2 0.18 0.14 0.08 24.2 20.7 18.1 31,0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 8 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 39.0 17.0 0.49 0.60 0.12 64.6 70.8 58.5 According to the proposed method, Fraction -0.6 + 0.05
In the first stage 3800 oersted
In the second stage 6800 oersted
In the third stage, 8,100 oersteds Tails 37.0 5.2 0.12 0.53 0.04 18.5 16.8 17.5 Sludge 24.0 7.4 0.14 0.11 0.08 16.9 12,4 24.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 9 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 33.0 18.8 0.50 0.61 0.12 59.1 61.1 83.9 49.5 According to the proposed method, the Fraction 10.4- + 0.035
In the first stage 3800 oersted
In the second stage 6800 oersted
In the third stage, 8,100 oersteds Tails 36.0 5,6 0.18 0.01 0.04 19,4 24.0 1.9 19.5 Sludge 31,0 7.3 0.13 0.11 0.08 21.5 14.9 14.2 31,0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0

table 2
Comparative results of the processing of cobalt-rich iron-manganese oceanic formations by analogue, prototype and invention (option 2) Experience No. 1 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 80.0 12.0 0.29 0.26 0.19 95.5 85.9 86.7 90.0 By analogue method Tails 20,0 2.25 0.19 0.16 0.04 4,5 14.1 13.3 10.0 Sludge 0 0 0 0 0 0 0 0 0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 2 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 64.0 14.0 0.32 0.29 0.1 85.3 75.9 77.3 80.0 According to the prototype method Tails 19.0 5.7 0.25 0.20 0.05 4.3 6.7 6.5 7.0 Sludge 7.0 6.5 0.26 0.24 0.08 10,4 17.4 16,2 13.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0

Continuation of table 2 Experience No. 3 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 33.0 20.3 0.54 0.63 0.14 63.8 66.0 86.6 57.7 According to the proposed method:
Jigging from fraction-12 + 0.5
concentration on the table from the fraction -0.5 + 0.044 Tails 38,0 4.6 0.15 0.008 0,03 16.6 21.1 1.3 13.3 Sludge 29.0 7.1 0.12 0.10 0.08 19.6 12.9 12.1 29.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 4 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 38,0 19.1 0.52 0.58 0.11 69.1 73,2 52,2 According to the proposed method
Jigging from the fraction -10 + 0.4
concentration on the table from the fraction-0.4 + 0.065 Tails 35.0 3.9 0.11 0.54 0.05 13.1 14.8 20.8 Sludge 27.0 6.9 0.12 0.10 0.08 17.8 12.0 27.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0 Experience No. 5 Processed products exit Content Extraction Experience Conditions Mn Co Ni Cu Mn With Ni Cu Concentrate for metallurgical processing 34.8 18.9 0.50 0.57 0.11 61.2 63.0 80.7 46.7 According to the proposed method
Jigging from fraction-13 + 0.6
concentration on the table from the fraction-0.6 + 0.085 Tails 37.0 5,4 0.16 0.04 0.05 19.2 22.0 6.0 24.3 Sludge 29.0 7.1 0.14 0.11 0.08 19.6 15.0 13.3 29.0 Raw material 100.0 10.5 0.27 0.24 0.08 100.0 100.0 100.0 100.0

Claims (3)

1. A method of processing cobalt-rich iron-manganese oceanic formations, including crushing, grinding, classification and subsequent separation of manganese and non-ferrous metals, characterized in that after classification from the fraction of -0.5 + 0.074 mm, manganese and non-ferrous metals are separated by gravity concentration concentration table with subsequent three-stage magnetic separation of the light fraction of the concentration table, while the magnetic field of the separator in the first stage is from 3500 to 4000 Oe, in Ora from 6500 to 7200 Oe, and the third between 8000 and 8200 Oe, and manganese and ferrous metals are removed in the magnetic fraction of the third stage. 2. A method of processing cobalt-rich iron-manganese oceanic formations, including crushing, grinding, classification and subsequent separation of manganese and non-ferrous metals, characterized in that the classification is carried out into fractions of -12 + 0.5 and -0.5 + 0.074 mm, and the allocation manganese and non-ferrous metals are carried out from the obtained fractions by gravitational enrichment on depositing machines from the -12 + 0.5 mm fraction and on concentration tables from the -0.5 + 0.074 mm fraction, while manganese and non-ferrous metals are extracted into the light fractions by gravitational enrichment Nia, who sent for chemical and metallurgical fine-tuning. 3. The method according to claim 1 or 2, characterized in that the processing process is carried out in a module on the ocean floor.

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