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Low grade oxide copper electroplating grade copper sulfate production new technology

Author: ChenChunLin
Tutor: ZhangXu
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Low-grade oxide copper Leaching Extraction Stripping Copper sulfate crystals
CLC: TF811
Type: Master's thesis
Year: 2008
Downloads: 69
Quote: 0
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Abstract


This study proposes a full wet processing of low-grade oxide copper production process of high quality copper sulfate processing ore material for the production of low-grade oxide copper in Gejiu, the ore grade of 0.95% copper, belong to the low-grade oxide copper. Throughout the trial process is divided into major copper mine sulfuric acid leaching, copper sulfate extraction and stripping copper sulfate crystals recrystallized three parts. Sulfuric acid leaching test mine, to examine the various factors affecting the leaching test data analysis and economic benefits to consider, recommended room temperature leaching, liquid-solid ratio of 4:1, the leaching solution with sulfuric acid concentration of 30 g / L, leaching time of 50 minutes, 62% of the copper leaching rate. Leaching solution containing copper 1.5 g / L, pH = 1.5, using ACORGA M5640 extraction, the saturation capacity of 0.584g / L, test extractant concentration on impact copper extraction, the extraction time, the aqueous phase pH and iron concentration and other factors research determine the extraction conditions are as follows: a single-stage extraction, the extractant concentration of 20% (V / V), the extraction compared to O / A = 1:3; extraction temperature is room temperature; extraction time 120S; organic and aqueous phase separation The faster time about 40S; copper extraction rate of 90% or more, 0.35% of the iron was extracted into the organic phase. Raffinate copper about 150 mg / L, and an organic phase containing copper 4.8 g / L, and the addition of an acid of the raffinate return leaching; the saturated solubility of the copper sulfate in the stripping solution, and sulfuric acid concentration is an important factor to affect the copper stripping effect, trial H2SO4 400 g / L of a saturated copper sulfate solution used in the stripping solution containing the the stripping liquid circulating stripping stripping conditions: stripping compared to the O / A = 4:1; temperature of 20 ° C; stripping 8min; after stripping organic Meet copper less than 10mg / L 450mg / L, iron. When stripping the aqueous phase is concentrated by evaporation after cooling to room temperature, 20 ° C, copper sulfate saturation crystallized crude copper sulfate crystals, stripping the organic phase is returned extraction. The slight decrease in the stripping solution of copper stripping rate reduce over acidity, each loop stripping rate in more than 94%. Entrainment of a small amount of impurities and sulfuric acid, copper sulfate crystallization trials using recrystallization of refined copper sulfate, copper sulfate crystals refined indicators have reached the electroplating grade copper sulfate standard. This process has the following characteristics: (1) the use of the test process more excellent the smooth output quality of the low-grade oxide copper electroplating grade copper sulfate products, provides a feasible method for the use of such mines. (2) As a result of the closed loop, and the solution during the cycle nothing more rows, does not cause environmental pollution, new contaminants are not produced in the process, the output was only copper sulfate product and a leach residue. M5640 extraction and copper sulfate saturated solution stripping (3), use of the high selectivity of the extraction agent, reducing the impurity content in the copper sulfate. (4) The process used equipment are conventional equipment, and easier to implement.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Heavy metals smelting > Copper
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