Method of dressing oxide nickel ores

FIELD: process engineering.

SUBSTANCE: invention relates to ore dressing and may be used for processing oxide nickel ore to up performances in pyrometallurgical production of ferroalloys. Proposed method comprises grinding ore to 2.0-3.0-mm-size, thermal treatment of ground ore to 550-600°C for, at least one hour, magnetic separation of annealed ore to extract magnetic fraction, fractionation of nonmagnetic fraction in its upward flow at hydrodynamic conditions and flow speed of 30-50 m/h to extract fraction of minus 0.3 mm.

EFFECT: power and material savings, simplified process.

 

The invention relates to the beneficiation of ores and can be used for processing of laterite Nickel ores and improve the technical and economic indices in the traditional pyrometallurgical methods for the production of ferroalloys.

The Nickel silicate ores distributed rather dispersed. The size of the mineral crystals of native Nickel is small and usually does not exceed 10 μm [Vershinin A.S. Geology, prospecting and exploration of supergene Nickel deposits. M.: Nedra, 1993, s.]. Such a fine distribution of Nickel in silicate ores complicates the selection of intermediate products with the help of nuclear-physical sorting and separation.

The second feature of silicate ores is the presence of silicate ores weathering products of relatively large allocations in the form of dense masses of iron hydroxides and silica - cuirass, ferruginous concretions, silica-ferrous concretions, with a high Nickel content. Nodules and veins of opal, chalcedony, quartz, relict fragments of weakly weathered and silicified serpentinite has a low Nickel content.

All oxidized ores, which are used for metallurgical extraction methods, including pyrometallurgical methods may be suitable for enrichment through this method. In fact, in these methods, the ore is usually what about the melted after recovery (if it applies) in electric furnaces, in which Nickel and some iron in the form of alloy, while other elements are removed in the vitreous slag. These methods retrieve consume huge amounts of energy, and the higher the Nickel content in the ore, the less energy is required to produce one tonne of Nickel and the greater the amount of metal produced on the same plant. Therefore, the application of the method provides the opportunity to either reduce the cost of production of metal or enhance the quantity of metal produced on the same equipment.

There is a method of enrichment of oxidized Nickel ores, which are implemented through lines comprising a device for repulpable, a device for grinding in the washing process raspolojennoi ore, dense medium gravity separator for separating granular (heavy), not containing fine particle fraction density (gravity device)that make up the module enrichment of raw materials (see RF patent 2200632 C2, 20.03.2003, WV 7/00), which is the closest analogue to the proposed invention and is taken as a prototype.

The disadvantages of the prototype is the complexity of technology, the need of regeneration severe environments and as a consequence high material costs.

An object of the invention is to simplify the technology and reducing material costs.

The problem is solved in that a method of enrichment of oxidized Nickel ores includes grinding and fractionation, characterized in that the source material is crushed to a maximum particle size of 2.0 to 3.0 mm, the crushed ore is subjected to heat treatment at a temperature of 550-600°C for at least one hour of burnt ore emit a magnetic fraction and a non-magnetic fraction is sent for fractionation in the ascending flow with variable hydrodynamic mode when the speed of the upward flow of 30-50 m/h to highlight the target fraction minus 0.3 mm

The essence of the proposed technical solution is that the heat treatment of oxidized Nickel ores in the declared modes leads to the manifestation of the discovered effect is a sharp increase in magnetic susceptibility of iron-containing phases in the composition of the ore materials. Fragments of grains with high magnetic susceptibility, at least maintain its strength, shape, and slightly increased content of Nickel in its composition relative to the total mass. Silicate basis of oxidized ores by heat treatment loses strength characteristics, there is destruction of the grain boundaries cleavage and spalling of the total mass of Rahmanov enriched in Nickel. This character of the observed changes allows you to implement additional in the moznosti enrichment Nickel target products, without resorting to the use of heavy environments. So the generation of the magnetic fraction from the calcined ore, you can obtain more enriched in Nickel faction. But the effect of the destruction of the silicate framework to increase the output of the dispersed phase, enriched in Nickel. These two factors allow us to achieve high recoveries of Nickel in the target products and the relatively low residual content in silicate-based ores.

The essence of the proposed method is confirmed by the examples.

Example 1. Samples of ore material Serov field of 1 kg were ground in a jaw crusher. Heat treatment of samples is carried out in the mine laboratory furnaces. The results of typical experiments are presented in table 1.

Table 1
The results of typical experiments.
no experienceTemperature,°CTime, hThe relative magnetic susceptibilityThe output of the magnetic fraction, %Enrichment of Nickel
Experience 125-1 0,671
Experience 250034,113,451,35
Experience 355037,497,581,52
Experience 46003the 7.65a 7.621,48
Experience 570037,727,631,53
Experience 680037,747,631.50
Experience 75700,54,82of 3.641,39
Experience 857017,547,601,50
Experience 95701,57,70the 7.651,55
Experience 105702of 7.75to 7.671,47

Magnetic susceptibility is presented relative to the original ore.

According to table 1, it is seen that the optimum firing temperature in the range of 550-600°C, and sufficient time firing at least one hour.

Example 2. Samples of ore material Serov deposits were ground in a hammer mill to various sizes. The distribution of Nickel fractions are presented in table 2.

Table 2
The results of the experiments
IndicatorsSample # 1Sample # 2Sample # 3
Klas is a fraction, mm10-52-10,4-0,2
Output fraction, %38,9723,8216,32
The Nickel content, %0,690,781,05
Nickel output, %28,2417,0215,33
Class fraction, mm5-11-0,630,2-0,16
Output fraction, %24,4623,3810,15
The Nickel content, %0,910,961,09
Nickel output, %23,3720,569,90
Class fraction, mm1-0,40,63-0,40,16-a 0.1
Output fraction, %18,9814,0213,68
The Nickel content, %1,011,071,12
Nickel output20,1313,7413,71
Class fraction, mm-0,4-0,4-0,1
Output fraction, %17,5938,7859,85
The Nickel content, %1,531,371,14
Nickel outputof 28.2648,6861,05

According to table 2 shows that in thin classes of the Nickel content of balisacan at large. Depending on the fineness of grinding the distribution of different Nickel, while grinding up to 10 mm, small classes are more enriched in Nickel than grinding up to 2 mm and 0.4 mm, but the output of Nickel in a more subtle grinding higher than in large. The most preferred particle size of the grind is the grain size of 2-3 mm, because at this size the most complete there is the opening of grain boundaries and there is a significant enrichment of Nickel with sufficient access to the target faction. In fine grinding is practically no enrichment of small classes for Nickel, this can be explained by the averaging of the source material when grinding.

Example 3. Ore Serov deposits, crushed by the crusher to the size of minus 2.0 mm, was divided into pulsating column at different linear velocities of the upward flow. Data on the fractionation column are presented in table 3.

The output of the fine fraction
Table 3
Fractionation on the column.
The separation performanceThe speed of the upward flow, m/h
10205075
12,520,42933,5
The Nickel content in the fine fraction1,481,261,191,1
The Nickel content in the coarse fraction0.940,970,940,96
The extraction of Nickel in the target faction18,462534,4636,7
Enrichment of Nickelof 1.571,301,261,15

Fractionation on a column with a variable hydrodynamic mode at low speeds there is a significant enrichment of the target fraction of Nickel, but the yield of the target fraction is not great, with increasing speed of the upward flow is reduced enrichment of the target fraction, but increased output of Nickel. Thus, when the separation of the pulsation column can be adjusted enrichment and Nickel output at of the Anenii speed of the upward flow.

A method of enrichment of oxidized Nickel ores, including grinding and fractionation, characterized in that the starting material is crushed to a maximum particle size of 2.0 to 3.0, the crushed ore is subjected to heat treatment at a temperature of 550-600°C for at least one hour of burnt ore emit a magnetic fraction and a non-magnetic fraction is sent for fractionation in the ascending flow with variable hydrodynamic mode when the speed of the upward flow of 30-50 m/h to highlight fraction minus 0.3 mm



 

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