Extraction method of nickel from oxidised nickel ores

FIELD: metallurgy.

SUBSTANCE: method involves heap leaching of nickel with sulphuric acid solution, neutralisation of production solution, sorption of nickel on ionite from it, processing of strippant so that nickel is obtained, supply of raffinate solution for heap leaching of ore during its revolution and circulation. At that, some part of raffinate is subject to neutralisation with lime milk and its cleaning from impurities of iron, manganese and magnesium by directing in the form of neutralised pulp to waste heap for deposition of iron, manganese and magnesium on it with further mixing with the main volume of cycling solution of raffinate and final strengthening with sulphuric acid. Volume of some part of raffinate, which is subject to neutralisation and cleaning, as per the amount of iron, manganese and magnesium, corresponds to their transition to production solution during leaching of nickel from the ore during circulation of cycling solution.

EFFECT: simplifying the utilisation process of iron, manganese and magnesium and heap leaching process of nickel.

1 dwg, 1 tbl

 

The invention relates to metallurgy, and in particular to methods of extraction of Nickel from laterite Nickel ores of ferrous and magnesium types.

As a prototype of the selected method of extraction of Nickel from Ni-Fe-Mg lateritic ores containing large amounts of magnesium (U.S. patent No. 5571308), in which magnesia ore processed by heap leaching with sulfuric acid followed by neutralization productive solution and then the sorption of Nickel on the selective ion exchangers resin. Desorbed with high Nickel content is sent for further processing by removing the cathode of Nickel by way of electrowinning, and a portion of the raffinate is subjected to neutralization with lime milk and purification from impurities of iron, manganese and magnesium by sending in the form of neutralized slurry to waste a bunch for deposition on iron, manganese and magnesium, followed by mixing with the main volume of the working solution of the raffinate and doripenem sulfuric acid.

The disadvantages of this method are the utilization of the magnesium-containing solution, burial precipitate iron hydroxide and the need for continued stabilization of the volume of leach solution by adding water to compensate for the volume withdrawn from circulation solution of magnesium sulfate and hydroxide of iron.

Tasks which is aimed at solving the claimed invention, are simplifying the utilization of iron, manganese and magnesium and the whole process of heap leaching of Nickel.

This task is solved in that in the method of extraction of Nickel from laterite Nickel ores, including heap leaching of Nickel sulfuric acid solution, followed by neutralization productive solution and sorption of Nickel on the ion exchanger, the processing decorate, neutralizing part of the raffinate and the precipitation of the iron, part of the raffinate is sent to waste a bunch for the deposition of iron, manganese and magnesium, and the volume part of the raffinate subjected to neutralization and purification, the amount of iron, manganese and magnesium must comply with their transition into productive solution in the leaching of Nickel from the ore during circulation of the circulating solution.

The method was carried out as follows.

The pregnant solution after sulfuric acid heap leaching of magnesium or ferrous ores containing Nickel, cobalt, iron, magnesium, manganese and concomitant impurities, is fed to the operation of selective sorption of Nickel and cobalt on the ionite chelate resin type, such as DOWEX M4195. Sorption on ion exchangers chelate resin type allows you to selectively adsorb Nickel and clear it from magnesium, manganese and partly of iron. Desorbed, reduced in volume in dozens of times in relation to the original productive R is the target and containing up to 60 g/l of Nickel and 5-6 g/l of iron, after hydrolytic purification from iron is supplied to the processing solution to produce cathode Nickel method electrowinning or certified Nickel sulfate.

The precipitate of iron hydroxide formed when cleaning decorate is routed to a waste pile for the co-disposal of waste space career when his reinstatement.

Part of the raffinate is subjected to neutralization with lime milk and purification from impurities of iron, manganese and magnesium by sending in the form of neutralized slurry to waste a bunch for deposition on iron, manganese and magnesium, followed by mixing with the main volume of the working solution of the raffinate and doripenem sulfuric acid. The hydroxides of iron, magnesium and manganese deposited on the ore material waste heap together and stored in the waste space quarry oxidized Nickel ore and reclamation.

And the volume part of the raffinate subjected to neutralization and purification, the amount of iron, manganese and magnesium must comply with their transition into productive solution in the leaching of Nickel from the ore during circulation of the circulating solution.

The solution after the precipitation of hydroxides of iron, manganese and magnesium on the waste pile is mixed with a basic solution doubleplays sulfuric acid is served on a heap leach ore (see the drawing).

This allows you to stabilize the circulating washing solution according to the content of iron, magnesium and manganese without filtering and organization of the special landfills for precipitation of the hydroxides of iron, magnesium and manganese.

Stabilization productive working solutions on the content of impurities in the feed portion of the raffinate after neutralization at the spent ore material to be excluded from the process technology filtration precipitation of hydroxides and their deposition on the spent ore material is confirmed by experiments on percolation leaching conducted on the averaged core samples taken from the field of oxidized Nickel ores "Kungur".

The chemical composition of magnesium ore, %:

Ni=0,84

With=0,025

Fe=KZT 12.39

Mn=0,36

Mg=14,65

Cr=0,24

Sa=8,8

SiO2=31,4

Table 1 shows the contents of the elements in a productive working solutions percolation leaching after sorption of Nickel on ionite resin DOWEX M when circulation of the solution without precipitation of hydroxides on used material heap and neutralize 50% of these solutions and applying them on the used material percolation columns.

First column.

Leaching and circulation leach solution leaving the first column, made be the neutralization and removal of impurities.

The second column.

The sulfuric acid solution in an amount of 10 liters with a sulfuric acid concentration of 100 g/l was fed into the top of the second column on the surface of the ore at a speed of 5 liters per hour/m2. Leaching was carried out for 15 days. The total time of passage of the solution through the ore layer 3 nights. The sorption of Nickel from the pregnant solution produced on the resin DOWEX M4195. The raffinate was subjected to neutralization with lime milk and was applied to the surface of the ore in the waste percolation column. Then neutralized raffinate leaving the waste column, were analyzed for the presence of impurities and doreplace sulfuric acid to 100 g/L. then doubleplay solution was again applied to the surface of the ore to leach Nickel.

From the above example shows that the removal of impurities from the raffinate possible without the process of separation of the liquid and solid phase by filtration. Enough to supply the neutralized slurry with hydroxides on the surface of the ore in the waste percolation column. This provides stabilization of the salt composition productive solution that allows you to more effectively manage the process of sorption of Nickel.

Table 1
The method of heap leachingThe current pls, g/l
NiCoFeMgMnThe leaching time, the day
Percolation leaching without neutralizing the circulating solution
1. 1st productive solution0,10,053,15,20,33
2. Working solution -10,10,066,914,80,76
3. Working solution 20,10,067,216,10,89
4. About the commander solution 30,10,078,718,31,112
5. Working solution - 40,10,0810,320,51,315
Percolation leaching with neutralization and flow of the circulating solution to waste percolation column.
1. 1st productive solution0,10,053,15,20,33
2. The circulating solution 10,10,052,9 5,20,26
3. Working solution 20,10,032,7a 4.90,39
4. Working solution - 30,10,042,25,30,412
5. Working solution - 40,10,031,75,00,215

The method of extraction of Nickel from laterite Nickel ores, including heap leaching of Nickel sulfuric acid solution, neutralizing productive solution, sorption of Nickel on the ion exchanger, the processing decorate obtaining Nickel, feed raffinate solution in heap leaching of ore in its turnover and circulation, characterized in that a portion of the raffinate is subjected to neutralization with lime milk and purification from impurities of iron, manganese and magnesium by sending in the form of neutralized slurry to waste a bunch for deposition therein jelly is a, manganese and magnesium, followed by mixing with the main volume of the working solution of the raffinate and doripenem sulfuric acid, the volume part of the raffinate subjected to neutralization and purification, the amount of iron, manganese and magnesium corresponds to their transition into productive solution in the leaching of Nickel from the ore during circulation of the circulating solution.



 

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