Method for extraction of copper and/or nickel from cobalt-bearing solutions

FIELD: metallurgy.

SUBSTANCE: method involves supply of solution with high content of cobalt, which contains cobalt, nickel and copper; sorption by means of contact of the above solution with N-(2-hydroxypropyl)picoline amino resin. Selective elution of cobalt, nickel and copper is performed after sorption by means of continuous gradient acidic elution. At that, pH of the above solution is less than or equal to 2.

EFFECT: reducing the costs and increasing the efficiency of the method.

2 cl, 1 ex

 

The present invention relates to an improved method of extraction of copper and/or Nickel from solutions containing cobalt.

For many years the unique ability of bis-picolylamine chelat forming resins, such as DOWEX™ N-4195 and XUS-43578, commercially available from The Dow Chemical Company, to remove traces of Nickel from cobalt electrolyte at low pH, gave them a special place in the flow charts of some refineries cobalt in the world. Later cobalt began to recover as a "bonus"-the metals copper mining or processing waste. These threads cobalt electrolyte often contain substantial amounts of copper along with small amounts of Nickel. While bis-picolylamine resin well is used to remove Nickel, they are hyperselective for copper and effectively elute copper with sulfuric acid (ammonia or other alkali is usually required for elution), as they work with Nickel, and can therefore become contaminated with copper.

In the production of cobalt highest quality from primary treatment plants cobalt purity cobalt electrolyte final stage is paramount to achieving high-quality cobalt characteristics on the basis of Electrovaya. Some refineries cobalt mainly use the define the company selective removal of Nickel, using resin helatoobrazutee. Most associated with the mining of Nickel and not challenged by the residual copper ions in their concentrates of high cobalt content. However, some new producers of copper and some mines special cobalt mining plan to produce cobalt highest quality, but are faced with significant levels of copper in their concentrates of high cobalt content and electrolytes.

The methods of industrial allocation of Nickel from solutions of high cobalt content (i.e. cobalt electrolyte) exist in commercially managed devices. These methods use selective Nickel bis-picolylamine (Bis-PA) functionalized polymer chelat forming resin (i.e. DOWEX® M-4195; Dow XUS-43578 chelat forming resin). Bis-PA resin is unique in many commercial products of ion exchange. They are able to adsorbirovanny transition metal ions even when the pH of the raw material is less than 2, differentiating them from less universal iminodiacetic acid (IDA) hepatoblastoma resin. These resins have proven to be very economical. New methods of using Bis-PA resin systems continuous ion exchange (continuous ion exchange CIX) has very much improved the efficiency of the separation.

Application CIX technology in comparison with standard treatment across NEPAD iny Layer, minimizes supply of resin, water and chemical use. Under conditions of standard processing through a Fixed Layer, a significant portion of the stock resin do not participate in the "working" process. Only part of the resin, which is heavily exposed to the adsorption of the target ion (transition zone mass), does "work". The balance of the resin or: 1) exhaust and in equilibrium with the filing; or (2) pending solution for filing. Continuous treatment addresses this inefficiency by immediate move waste (loaded) resin on the next stage of processing, minimizing the amount of resin, pending submission. CIX provides a very efficient operation, resulting in high-quality cobalt electrolyte and market products of Nickel.

The problem arises, however, if raw materials for industry cobalt electrolyte contains copper ions. "Hyperselective" Bis-PA resin for copper ion (cupreous combustor and Cupric) leads to the resin contaminated with copper ions, thereby reducing its ability and effectiveness to remove Nickel. In contrast to the behavior of Nickel and cobalt loaded on Bis-PA resin, solenoceridae copper ions effectively not elute from the resin with acid additionally separated by. Consequently, alkaline elution, through ligand exchange in ammonium hydroxide, which is difficult chemical is Eski intense and stressful for the matrix resin, because the resin is compressed and forms a convexity at the time of such transactions.

So far, the most practical solution for refinery cobalt with copper in raw materials for the industry of cobalt, was to use "protective layers" of the same Bis-PA resin, which is loss-making mines copper, forward resins removal of Nickel. A little less "protective layer can then be subjected to periodic alkaline elution, without interrupting the process of removing Nickel or affecting a larger volume of resin removal of Nickel. Unfortunately, the "protective layer" can be expensive and time-consuming. Many locations refineries do not allow, or wish to consume the cost of treatment with ammonia and ammonium waste and by-products.

Successfully present invention solves the problems of the prior art, providing an alternative method of processing copper in the method of purification of Nickel. This alternative method is not only suited for processing of copper, but also lowers operating costs and increases the efficiency of the entire method of purification of Nickel.

The present invention provides a method for the recovery of cobalt, including:

i. the supply of the solution to the high content of cobalt, in which the solution of high cobalt content includes cobalt and Nickel;

ii. contact rastv the RA of the high content of cobalt with N-(2-hydroxypropyl)picolylamine resin to download N-(2-hydroxypropyl)picolylamine resin cobalt and Nickel;

iii. elution of cobalt from the loaded N-(2-hydroxypropyl)picolylamine resin; and

iv. elution of Nickel from a loaded N-(2-hydroxypropyl)picolylamine resin.

As used here, the solution to the high content of cobalt involves the solution containing cobalt with at least 10 g/l of cobalt.

In the present invention a solution of a high concentration of cobalt in contact with N-(2-hydroxypropyl)picolylamine (NRRA) functionalized resin. The solution to the high content of cobalt contains Nickel and may also optionally contain copper.

In the present invention is applied N-(2-hydroxypropyl)picolylamine (NRRA) functionalized resin such as, for example: NRRA Resin; i.e. XUS-43605 or XFS-43084 developing hepatoblastoma resin, obtained from The Dow Chemical Company. This resin was initially developed as a resin mining copper, capable of replacing solvent-extractants, they could achieve similar (or better) removal of Nickel with greater selectivity of Ni:Co, eliminating the need for an exception for copper protective layer ammonium and alkaline elution compared to Bis-PA resin. It is interesting to note that at very low pH chemical affinity of copper for Bis-PA resin by several orders of magnitude greater than for NRA resin. Within pH 2, the resin has a high x the chemical affinity for Nickel and/or copper, but almost no chemical affinity for cobalt, in contrast to the selectivity old Bis-PA resin, which at the same pH strongly binds to all three metals. the pH for the method is effective at low pH. The preferred pH is less than or equal to 2.

NRRA resin of the present invention can be used in highly efficient ways, especially in the device of continuous ion exchange, such as, for example selling Outec, Puritec, Calgon Carbon and IONEX. Preferably the method of the present invention is continuous.

NRRA resin of the present invention has a particle diameter of 300 to 500 microns, preferably from 350 to 450 microns, and more preferably from 375-475 microns. NRRA resin of the present invention are macroporous bubble resin and typically have a uniform particle size.

In the present invention, a certain amount of cobalt along with the Nickel loaded on the resin, and when there is copper, copper "dozagruzki with Nickel on NRRA resin, still readily eluted with acidic additionally separated by. This method differs from previous methods of the prior art by the fact that alkaline eluent is not needed. An additional benefit of NRRA resin in comparison with the Bis-PA resin of the previous prior art is that binds much less cobalt with NRRA resin than with Bis-PA resin, making it easier for the elution of Nickel and a diagram d is the Tcl of the eluate cobalt. As ions of Nickel and/or copper load on NRRA resin, cobalt, "embossed" or "extruded" from the resin and replaced by Nickel and copper. During this stage, the load profile of elution of cobalt consistently higher than the content of the submission, indicating that the cobalt after the initial binding is released.

Industrial refineries cobalt using Bis-PA resin of the previous prior art dealing with the fact that at the point where the resin is exhausted and ready for elution of Nickel, a significant amount of cobalt is sodagreen Nickel. Before the Nickel can be blueraven, sodagreen cobalt must be selected from resin and restored to process when preparing the solution supply system to the dissolved cobalt. Selective elution of cobalt and Nickel may be simple acid gradient elution.

Cobalt eluted from the loaded resin acid, such as sulfuric acid, such as, for example, 2% sulfuric acid, thus the processing plant produces a relatively undesirable moderately acid byproduct stream, approximately 25% of the initial feed volume which contains 5-10 g/l of cobalt. Most of this "by-product" can be used as acid dissolved cobalt supplied solution, but it nevertheless represents 2.% cobalt recyclebank detained solution to complete the process in comparison with less than 0.2% of cobalt recyclebank detained solution for NRA resin of the present invention. Selective elution of Co, Ni and/or copper may be simple acid gradient elution. Accordingly, NRA resin dramatically and reduces CAPEX (no need for C protective system) and WALNUT (less With the swelling solution) for refineries cobalt.

EXAMPLE

Example 1: raw materials

Example 1 was executed on false cobalt electrolyte prepared by dissolving sulphate cobalt (II) and Nickel sulfate (II) in dilute sulfuric acid. False electrolyte contained 90 g/l of cobalt and 400 ppm of Nickel. False electrolyte was adjusted to pH process with sulfuric acid and heated to 70-75 degrees Celsius.

Example 1 was completed using three columns from CIX pilot skid. Adsorption was done in several stages and elution were performed on a single column. Columns were formed from transparent PVC with a Bang with a wedge-shaped bars HASTALLOY in the top and bottom. These speakers were 3.8 cm in diameter and 100 cm height. Each was charged with 1 liter of resin (88 cm depth) and the remainder of the column was filled with inert polypropylene balls.

Adsorption and elution was carried out by way downstream through a Masterflex peristaltic pumps. The flow rate of the adsorption feed were set at 7.5 Volumes of Layer (OS) on the hour (3 Nr. × 1 l × 7.5 l/h=22.5 l/h=375 ml/min). Threads elution b is installed in OS 5.5 - 7 OS for an hour or 91.6-116 ml/min (only one column on the OS).

The sample (30 ml) were collected periodically, and recorded the time and flow rate. Analyses of feed, product, and purified products were made primarily Atomic Adsorption (AA) Spectroscopy.

1. Method of extraction of copper and Nickel from solutions containing cobalt, including:
i. the feed solution with a high content of cobalt, which contains cobalt, Nickel and copper;
ii. contact of the solution with a high content of cobalt with N-(2-hydroxypropyl)picolylamine resin and
iii. selective elution of cobalt, Nickel and copper by acid continuous gradient elution.

2. The method according to claim 1, wherein the pH of the above solution is less than or equal to 2.



 

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