Shuangfeng Copper Concentrator (USA)
Addition of copper oxide ores using quartz isolated - flotation process, the flotation process is substantially vulcanized; Currently, acid leaching - extraction - electrowinning plant is selected in medium-sized industrial trials, have been used in some local small factories produce.
1. Shuangfeng Copper Concentrator (USA)
1 Overview
The Twin Buttes copper mine is located approximately 32 kilometers south of Tucson, Arizona, USA. Anaconda started construction of the mine in 1965. In November 1969, it built a sulphuric ore dressing plant with a daily processing capacity of 30,000 tons. In 1970, the molybdenum plant was put into operation. After the formation of the Annamax Mining Company in 1973, the company expanded its double peak and built a new water and metallurgical plant to treat oxidized ore, with an annual output of 36,000 tons of electrolytic copper. The fourth series of expansion of the sulfide ore system will produce 126,000 tons of copper per year after the completion of all the projects. Among them, the sulphide ore dressing plant produces 90,000 tons, and the oxidized ore plant produces 36,000 tons.
â‘¡ bimodal nature of the ore deposits and copper ore mainly native, mainly chalcopyrite, bornite as well as secondary, and other sulfur compounds, and a large number of associated pyrite. The surrounding rocks are mainly limestone , strontium limestone, contact metamorphic carbonate and quartz monzonite, and the oxidation depth is generally above 30~60 meters. The ore body is buried deep, the upper part covers 8~15 meters thick hard gravel, and the upper part is 120~180m thick Quaternary topsoil.
â‘¢ acid leaching - extraction - electrowinning oxide ores crushing process, after grinding, leaching with sulfuric acid leaching solution with an organic phase (extractant is typically a mixture of coal and oil Lix64N) extraction of copper, so that very low concentrations of copper into In the organic phase, the copper-containing organic phase is back-extracted with sulfuric acid, and the back-extracted solution of 50 g/liter of copper is sent to the electrolysis workshop for electrolysis to obtain cathode copper. The process is shown below.
The Shuangfeng plant has two parts: one is to treat 36,000 tons of ore sulfide ore in another, and the other is a copper oxide ore processing plant. It was put into operation in 1975 and is the world's largest leaching-extraction-electrochemical plant. According to the design, it treats 10,000 tons of oxidized ore per day, with an average of 1.35% copper, containing 1.02% acid-soluble copper, 100 tons of cathode copper per day, and 30,000 tons of cathode copper (purity of 99.995%) in 1976, processing ore 290. Ten thousand tons, with an average copper content of 1.3%, reached a design capacity of 36,000 tons of copper in 1977. [next]
American bimodal copper oxide leaching-extraction-electrowinning plant process
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The original mine was loaded from a mine with a 2.67 m 3 electric shovel to a 50 or 100 ton ore truck, and the ore was transported to the crushing plant, crushed to less than 200 mm with a smashed crusher of 1.22*1.52 m. It was crushed with a 2100 mm standard cone crusher and the product entered a closed circuit consisting of two 2100 mm short-head crushers and two 2.44*6.09 m double-layer screens. The final crushed product has a particle size of 13 mm and the powder mine has an effective volume of 15,000 tons.
There are two parallel series of grinding. Each series consists of a Ñ„3.5*5.64m rod mill and a 3.81*6.14m ball mill . The open-mill grinding product has a particle size of -48 mesh and 95%. The pulp concentration is 60%. The reason for using open-circuit grinding is that it can obtain higher leaching ore concentration than closed-circuit grinding operations. The grinding capacity is 440 tons / hour.
Acid leaching
The ground product has a solids concentration of 60% and is divided into two streams by a distribution tank, one for leaching and the other for pH adjustment.
The leaching was carried out in five mechanically agitated dip tanks arranged in series, rubber-lined, 9.14 m in diameter and 9.45 m high. The concentration of 93.2% sulfuric acid was added from the acid storage tank to the first leaching tank. There are four storage tanks for sulfuric acid with a total volume of 21,000 tons and a sulfuric acid consumption of 113 kg/ton. According to the daily treatment of 10,000 tons of oxidized mineral meter, the leaching pH is 1.5.
After the leaching, the slurry concentration was 50%, and it was sent to four concentrators with a diameter of 122 meters, and the waste liquid from the extraction plant was returned for countercurrent washing. The solids flow from the No. 1 concentrator to the No. 4 concentrator and finally to the tailings dam. The waste liquid of the extraction plant is reversed, flowing from the No. 4 concentrator to the No. 1 concentrator, and overflowing as a mother liquid to the pH adjustment tank. To adapt to the solvent extraction, the mother liquor is overflowed to the No. 1 concentrator, and the unreacted grinding slurry is added. , adjust the pH from 1.5 to 2.5. The residence time of the slurry in three mechanically agitated pH adjustment tanks was 45 minutes.
When the slurry comes out of the pH adjustment tank, the concentration is about 10% solid. It is purified by the second-stage concentrator. According to the design, the overflow of the first 122-meter-diameter purification concentrator contains 30~80ppm of solid. The sink of these two concentrators The sand returns to the agitation leaching tank, and the liquid overflowing from the second purification concentrator is called a copper-containing mother liquor. After clarification, it enters the adjustment tank, is tempered to 20 ° C with steam, and then enters the filter press.
After solvent extraction and filtration, the mother liquor contained 2.5 g/L of copper, and the total flow rate was 26.6 m 3 /min. The extraction was carried out in parallel in two rows with four extractions per system. The organic extractant Lix64N was dissolved in kerosene at a volume percentage of 12%. After the extraction, the residual aqueous phase contained about 0.08 g/liter of copper, and returned to the leaching operation. The copper-loaded organic phase contained about 25 g/liter of Cu. The two parallel systems were subjected to two-stage back extraction with sulfuric acid, and the copper backed extract contained 50 g/L of copper.
Electrowinning
The copper stripping extract contains 50 g/L of copper and is sent to electrolysis to obtain a cathode copper having a purity of about 99.995%. In general, 25 grams of copper can be extracted per liter of extractive mixture, and the extraction rate is over 95%.
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