RU2353754C2 - Method of undeground leaching of oxidised nickel ores, containing ferrous and magnesia ores - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to mining and can be implemented for underground leaching of non-ferrous metals, particularly, of nickel. According to the method of underground leaching of oxidised nickel ores, containing ferrous and magnesia ores, at first there is determined approximate profile of division between ferrous and magnesia ores. Injection and evacuation boreholes pass through an ore body; also the continuous part of a cased pump in evacuation boreholes is assembled in layers of ore with index of geo-chemical zonality exceeding 0.8. A perforated section of the cased pipe is installed lower; direct sulfuric acid leaching during not less, than 30 days and successive collection of productive solution is performed thereafter.

EFFECT: development of efficient method of underground leaching of non-ferrous metal ores.

3 dwg

Description

The invention relates to mining and can be used for underground leaching of non-ferrous metal ores, in particular nickel.

Deposits of oxidized nickel ores of the area type have a zonal structure, reflecting the successive stages of rock decomposition, from serpentinites upwards through leached serpentinites and nontronites to products of iron hydroxide and ocher. In individual deposits, the distribution and thickness of each of the zones can be different, up to the absence of one or more zones. The height of each zone can vary from 5 to 50 meters. A diagram of the zonal structure of the deposits and a generalized geological and geochemical section, such as that of the Buruktalsky deposit, are shown in Figs. 1 and 2. Nickel in the deposits of areal type is in two forms: silicate and isomorphic, being a part of magnesium hydrosilicates, and, as serpentenites are destroyed , in the adsorbed impurity NiO and Ni (OH) ₂ on other minerals.

The degree of decomposition of serpentinites in individual zones can be determined by the indicator of the geochemical zonality of KZ (Reznik I.D., Ermakov G.P., Shneierson Ya.M. "Nickel"; LLC "Science and Technology", M .: 2000, v.2, p. 18-19), calculated according to the content (wt.%) of components experiencing an increase in concentration, to components subjected to scattering:

Kz with the destruction of serpentinite increases: for magnesian ore Kz = 0.1, for iron ore Kz> 12.0

Studies on the hydrometallurgical extraction of nickel from oxidized nickel ores of various types have shown that it is possible to efficiently recover from iron ores with KZ more than 0.5 by the method of sulfuric acid vat after firing of iron ores (RF patent No. 2161658).

At the same time, the technology of hydrometallurgical processing of magnesia ores with КЗ less than 0.8 with preliminary firing does not provide efficient nickel recovery. However, direct sulfuric acid leaching of magnesian ores, carried out for a long time (underground leaching, see table 1), leads to economically acceptable results for the extraction of Nickel.

Thus, for the efficient extraction of nickel from oxidized ores, it is necessary to affect their glandular and magnesian components in different ways.

As a prototype of the claimed technical solution, a method of mining has been selected (RF patent No. 2175385), including determining the structure of the ore, sinking through the ore body of the mine workings, feeding the leach solution and collecting the productive solution.

The disadvantages of the prototype are the rise to the surface of the ore with different values of the index of geochemical zonality, which leads to a decrease in the yield of the target product extracted during further processing of the ore, as well as the need to discard the remaining ore reserves and store them underground, which requires corresponding costs for these operations.

The problem to which the claimed invention is directed, is to rise to the surface of the ore with a homogeneous structure, which allows to increase the yield of the target product during subsequent ore processing, as well as to simplify the capital intensity of the method of underground leaching.

The problem is solved in that in the method of underground leaching of ores having ferruginous and magnesian ores, the interface between the ferruginous and magnesian ores is determined, injection and pumping boreholes pass in the ore body, while in the injection wells the solid part of the pipe is placed in the ore layers, indicator the geochemical ash content of which exceeds 0.8, and the perforated part of the casing is located below, after which direct sulfuric acid leaching is carried out for at least 30 days and subsequent product collection ivnogo solution.

The continuous casing reinforcement of the injection wells to the ore layer, the geochemical zonality of which does not exceed 0.8, makes it possible to use the direct sulfuric acid leaching method for the underlying ore layers, which ensures a high yield of the target product, simplifies and reduces the capital intensity of the underground leaching process.

The method is as follows.

At the first stage, the approximate profile of the separation between glandular and magnesian ores is determined, which is within the range of biochemical zonality equal to 0.5-0.8.

At the second stage, injection and pumping boreholes pass in the ore body. In the injection wells, the solid part of the casing is located in the ore layers, the geochemical zonality of which exceeds 0.8, and below the perforated part of the pipe (see figure 3). After that, the method of direct sulfuric acid leaching is carried out.

In the third stage, the ore of the upper part of the ore body, which was not leached, is raised to the surface by known methods, if it is economically feasible. After that, the ore is subjected to a tank sulfuric acid after preliminary firing.

№№ Leaching time 5 days leaching time 10 days Leaching time 30 days The content in the cake after leaching No. of wells sampling depth, m residual sulfuric acid, g / l Ni g / l With g / l residual sulfuric acid, g / l Ni g / l With g / l Mn g / l Fe g / l residual sulfuric acid, g / l Ni g / l With g / l Mn g / l Fe g / l Ni% Co% Mn% Fe% one 6.5 81.4 but. 74.7 but. 0.018 0.29 1,67 42.8 but. 0.018 0.368 3.49 0.23 0.008 0.68 47.7 one 12.5 79.1 but. 73.5 0,024 0.011 0.29 1.39 61.2 0,084 0.017 0.77 6.14 0.36 0,076 0.79 50.7 one 27 76.5 0.285 0,046 70,4 0.39 0,066 1.97 4.2 49.5 0.852 0.09 1.99 10.6 0.66 0.118 3.39 36.7 one thirty 74.1 0.56 0.001 69.8 1.16 0.01 0.35 2.79 36.75 2.5 0,023 1,1 10.89 1,6 0.2 5.1 37,2 one 46.5 34.3 0.708 0,036 4.3 1.3 0.019 0.7 1,67 one 3.39 but. 0.29 0.1 0.63 next 0.59 8.4 one 56 55.1 0.432 0.015 24.5 0.93 0,024 0.59 2,37 0.6 1,1 but. 0.53 0.28 0.68 next 0.83 12.6 2 5 79.6 but. but. traces 0.42 67.3 0.15 but. 0,073 0.62 but. but. 0.2 12.8 2 14.5 69.2 but. but. 0.05 0.69 52.67 0.12 0.017 0.35 6.08 0.599 0,076 0.8 46.3 2 23 67.3 0.129 0.015 0.59 0.83 36.75 0.693 0,025 1.47 8.9 1.7 0.5 9.5 44.8 2 32 63.7 0.75 0.018 0.52 1.95 3.43 1,69 0.016 0.74 1.82 0.94 0.08 1.74 26.3 2 37 3.6 1.38 0.02 0.4 1.95 0.73 0,048 1.43 14.9 2 40,4 81.4 0.717 0,037 0.267 1.39 1,2 2.2 0,027 but. 0.89 0.32 next 0.5 7.2 2 59 60 0.855 0,027 0.35 2.09 116.3 2.25 but. but. 13,2 0.2 but. 0.58 7.3 2 62 77.6 1.92 0.012 but. 7.5 0.18 but. 0.54 9.8 Stock solution of sulfuric acid 100 g / liter

Claims (1)

The method of underground leaching of oxidized nickel ores having ferrous and magnesian ores, characterized in that they first determine the approximate separation profile between ferrous and magnesian ores, injection and pumping boreholes pass in the ore body, while in the injection boreholes, the solid part of the casing pipe is placed in layers ore, the geochemical zonality of which exceeds 0.8, and the perforated part of the casing is located below, after which direct sulfuric acid leaching is carried out e for 30 days and subsequent collection of the productive solution.

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