Method for the recovery of acids from hydrometallurgy process solutions
a hydrometallurgy process and acid recovery technology, applied in the field of separation of acid solutions, can solve the problems of resin degradation over time, low efficiency of resin loading and eluent use, and inability to consider smb for use in the field, and achieve the effect of adding product quality
Inactive Publication Date: 2008-04-24
KEARNEY MICHAEL M +3
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AI Technical Summary
Benefits of technology
"The invention is about a method for separating acid and metal salt solutions. The method involves using a simulated moving bed (SMB) process with resin to recover the acid and metals. The feed solution is a mixture of acid and metal salt solution, which is then separated into two product streams. The eluent used is water, which should contain less than 5% dissolved contaminants. The feed solution should be filtered to remove suspended solids. The SMB can be controlled by adjusting the conductivity profile of the metal salts phase. The invention can be used in a series of chromatographic separations, and the product streams can be further processed using various methods. The invention allows for efficient recovery of acid and metals from solution."
Problems solved by technology
In general, it is likely that SMB has not been considered for use in the field due to, e.g., the expected difficulty or inability of applying SMB to a material which involves an acid retardation mechanism (more akin to adsorption) for recovery.
The foregoing method is the simplest to configure and understand but is typically the least efficient with respect to resin loading and eluent use.
Although Higgins loops can be more efficient than batch chromatographic systems, they exhibit a number of problems.
In particular, the movement of the resin typically results in resin degradation over time.
Method used
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example of invention
[0035] A solution containing sulfuric acid, dissolved copper and iron was treated by this invention. A pilot plant SMB apparatus was utilized. The materials of construction were resistant to the particular acid(s) and metals being recovered. In this Example the preferred materials were Teflon, polypropylene, PVC and Hastalloy C.
[0036] The simulated moving bed was configured as in FIG. 1. The SMB system was operated using continuous internal recirculation. The SMB columns were filled with Dowex XUR-1525 which is a strong base anion resin. The feed composition is indicated on table 1 and was loaded at 85 lbs. dissolved solids per cubic foot resin / day. Total resin volume for the test was 1.18 cubic feet distributed equally among the 8 columns. Other parameters are in Table 1.
TABLE 1Operating ParametersStep time14 minutesEluentwater (at a ratio of 1.5 water to 1.0 feed ona volume to volume ratio)Operating temperature30 CentigradeProduct ratio1.0 (ratio of acid product collected to me...
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Abstract
A method for the recovery of acids and other materials from hydrometallurgic process solutions comprising processing said solutions utilizing a simulated moving bed chromatographic method to produce at least two product streams.
Description
CROSS-REFERENCE TO RELATED CASES [0001] This application is a continuation of co-pending U.S. patent application Ser. No. 10 / 888,141, filed Jul. 9, 2004, pending, which application claims the benefit of U.S. Provisional Application No. 60 / 487,767, filed Jul. 16, 2003, the disclosures of each of which are hereby incorporated herein by this reference in their entirety.TECHNICAL FIELD [0002] The invention relates to the separation of acid solutions, such as acid / metal salt solutions used in the field of extractive metallurgy or from other acid / metal salt solution sources. BACKGROUND [0003] Hydrometallurgy refers to the dissolution of ores using aqueous solutions. Generally, three steps make up the process. These are: [0004] 1. The use of an aqueous solution to leach the metal. [0005] 2. Removal of impurities from the solution. [0006] 3. Recovery of the metal (or its compound) from the solution. [0007] The aqueous solution used for leaching is often an acid solution. These acids can inc...
Claims
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IPC IPC(8): B01D15/08B01D15/36B01DB01D15/00B01J39/00B01J49/00C02F1/28C02F1/42
CPCB01D15/185C02F2101/20C02F1/42B01D15/363Y02P10/20
Inventor KEARNEY, MICHAEL M.MUMM, MICHAEL W.VELASQUEZ, LAWRENCEJACOB, WILLIAM IV
Owner KEARNEY MICHAEL M