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1、Customer demand
The metal copper in copper ore is extracted by physical and chemical methods, and a theoretical and practical process is found for extracting copper from copper ore.
2. Basic customer data
Feed type | Copper production | Product shape | process mode | Solution copper content | Effluent copper content |
20% copper ore concentrates powder | 100 kg | Copper sulfate solution | Batch processing | 5-20% | 20g/L |
Copper sulfate solution | 100 kg | Electrolytic copper plate | Batch processing | 10-40g/L | 2g/L |
3.Process introduction
The experiment was mainly carried out in three steps:
In the first step, the copper metal in the copper ore is dissolved in the liquid, and the solid copper metal is converted into the free ion state;
The second step, the solution of dissolved copper is filtered to remove impurities;
The third step is to extract and purify the copper in the copper containing solution. The result is a high purity copper sheet.
4.Experimental Process:
1.Configure the concentration of about 10% to 15% concentration of dilute sulfuric acid
solution standby.
2.A certain amount of copper ore is weighed and crushed, and the crushed copper ore powder is placed in dilute sulfuric acid. After the copper ore is put into dilute sulfuric acid,
a violent reaction occurs in the solution, some gas emerges, and the copper ore slowly dissolves. The color of the potion turns cloudy.
3.Add an appropriate amount of oxidant to accelerate the dissolution of copper in the ore powder.
4.After about 1 hour,the solution appears stratified, green clear liquid appears on the upper layer,and very colored insoluble solid or sludge appears on the bottom.
5.The precipitation was filtered and separated, and the green liquid was filtered out.
6.The copper content of the green filtrate was analyzed, and the concentration of copper ion reached 40g/L. High copper content.
7.The electrolysis experiment was carried out on the green copper filter liquid, with the filter
liquid as the electrolyte, titanium plate as the anode and stainless steel plate as the cathode.
8.A certain intensity current is applied to the anode and cathode plate for electrolysis, and a
copper substance appears on the cathode plate and is attached to the cathode stainless steel plate. Continue electrolysis.
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Low-Grade Gold OreHeap Leaching Process for Low-Grade Gold Ore Based on High Pressure Grinding Roll ComminutionHeap Leaching Process for Low-Grade Gold Ore Based on High Pressure Grinding Roll Comminution
This heap leaching process for low-grade gold ore based on high pressure grinding roll (HPGR) comminution falls under the technical field of metallurgy, and is implemented in accordance with the following steps:
① The run-of-mine (ROM) gold ore is first subjected to open-circuit coarse crushing, and all coarse crushed products are fed into the secondary crushing system, followed by classification via a vibrating screen. Coarse oversize materials are returned to the secondary crushing equipment for further comminution, while undersize materials with qualified particle size are delivered into the HPGR.
② The HPGR performs open-circuit fine crushing, and the crushed products are treated through the combined operation of a wet vibrating screen and classification equipment. The finer overflow product is fed into the all-slime cyanidation leaching system, while the underflow (settled sand) and coarse-grained materials are mixed with an appropriate amount of lime for alkali adjustment, then transported to the leach pad for heap construction, realizing the classified leaching process for gold ore materials.
③ Upon completion of leaching, gold-bearing pregnant solution and tailings are obtained.
This process adopts HPGR open-circuit fine crushing, whose crushed products feature finer particle size and abundant surface microcracks. It can significantly improve the gold leaching rate, reduce the consumption of leaching agents, and shorten the heap leaching cycle. While the heap leaching operation is carried out, the fine-grained classified products are also recovered simultaneously.
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Recovering Gold from Gold Iodide Waste LiquorRecovering Gold from Gold Iodide Waste LiquorThe process comprises the following steps: preparation of a mixed system of sodium iodate, sodium iodide and water; production of complex salts of Au(I) and Au(I₃) under the action of the as-prepared mixed solution and a co-oxidant; extraction of crude gold powder; and purification to obtain refined gold powder.
Compared with the prior art, the gold iodide leaching method adopted in this process significantly improves the extraction recovery and purity of the recovered gold. Meanwhile, the process features simple operation, low environmental risk of the involved chemicals, and low cost, thus reducing production cost and improving production efficiency. Furthermore, iodine can be recycled and reused in the process, which further cuts production costs.
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Pollution-Free Smelting ProcessPollution-Free Smelting Process for Lead-Bearing Gold Concentrates from Knelson Gravity ConcentrationThe lead-bearing gold concentrates are treated with the independently developed crystallization washing technology, which enables hydrometallurgical separation of impurities including lead, iron and sulfur during gold smelting and extraction. This process features innovative and unique design, strong adaptability, and wide applicability for refining lead-bearing concentrates (including middlings) obtained from Knelson gravity concentration. It also provides high reference value for the processing of other lead-bearing concentrates.
An increasing number of domestic gold mining enterprises in China have adopted the Knelson gravity concentration process. At present, most Knelson gravity concentrates are processed via pyrometallurgical smelting, which is associated with harsh working conditions and high risk of lead poisoning. The application of this new process can thoroughly address the lead pollution problem, thus filling the domestic gap in this technical field.
