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Integrated hydrometallurgical and pyrometallurgical method for processing ore

a technology of hydrometallurgical and pyrometallurgical methods, applied in the direction of improving process efficiency, etc., can solve the problems of reducing the availability and continuity of the overall plant, complex treatment of ore, and lack of expandability, and achieve the effect of convenient drying

Inactive Publication Date: 2019-07-18
BHP BILLITON OLYMPIC DAM CORP
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  • Description
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Benefits of technology

The patent text describes a process for making a concentrate after flotation and leach steps. The concentrate is then dried to a water content of 15% or less, preferably less than 12%. The dried concentrate can be further processed using a steam dryer or flash dryer. The technical effect of this process is to improve the efficiency and quality of the concentrate production process.

Problems solved by technology

The technical problem addressed in this patent text is to develop a method for processing ore that overcomes the limitations of existing flowsheets, such as the lack of expandability, the short retention times of processing units, and the formation of scale and other minerals that can affect the process. The method should also be cost-effective and accommodate declining ore grade and varying mineralogy over the life of the deposit.

Method used

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  • Integrated hydrometallurgical and pyrometallurgical method for processing ore
  • Integrated hydrometallurgical and pyrometallurgical method for processing ore

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Heap Leaching and Flotation of Ripios

[0137]Ore samples, having a diverse range of mineralogy that reflected the actual range of ore mineralogy at Olympic Dam, were subjected to heap leaching (ie, step (a) of the disclosed process) in columns using an iron containing, acidic saline leaching solution in the presence of air. The Cu:S ratios of the ore samples ranged from approximately 3 to less than 1. The ore contained a number of iron containing minerals, such as siderite and chlorite, which provided a source of ferric in the leaching solution. The acid consumption of the samples also varied from high to low, reflecting the variation in gangue mineralogy. The U3O8 grade of the ore was variable ranging from approximately 200 ppm to 1,000 ppm.

[0138]The dissolution of copper and uranium was measured over time. FIG. 3 shows the results of these tests. The average dissolution (%) of U3O8 and Cu are plotted against time (days). The actual Cu and U extraction values ranged from 20% to 80% a...

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Abstract

A process for recovering copper, uranium and one or more precious metals from an ore material, including: a. forming a heap of the ore material; b. subjecting the heap of the ore material to an acidic heap leach using an iron containing acidic leach solution in the presence of an oxygen containing gas, and producing a pregnant leach solution and a ripios; c. subjecting the ripios to flotation to produce a copper containing ripios concentrate and tailings; and d. subjecting the ripios concentrate to a smelting process to produce a smelted copper product. e. recovering copper and uranium from the pregnant leach solution.

Description

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Claims

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Application Information

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Owner BHP BILLITON OLYMPIC DAM CORP
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