Application of Physical and Chemical Methods for Processing Slags of Copper Production (original) (raw)
Related papers
METHODS OF DECREASING OF COPPER LOSS WITH SLAG IN SMELTING PROCESSES
2017
The article considers metallurgical problems of measures to prevent of losing copper with waste slags in melting processes and main factors which negatively impacting to this index is temperature, content and condition of conducting copper smelting process. It has been installed what addition different secondary technogenic products of local industrial enterprises which consist of copper and other valuable components for changing physical and chemical properties of slags and lower general losing of copper.
Technology of Processing Slags of Copper Production using Local Secondary Technogenic Formations
International Journal of Innovative Technology and Exploring Engineering, 2019
The article considers the inevitability of copper losses with slag and the possibility of reducing them by various methods and using local secondary technogenic formations. It has been established that the developed and widely used in industry technologies for slag decontamination only partially solve the problem and lead to significant irretrievable losses of metal with dump slag. The main factors affecting the magnitude of the losses are established and suggestions for reducing their negative impact are recommended. The use of perfect mixing devices is recommended, as in this case, it is possible to achieve a maximum reduction in the residual concentration of copper in the waste slag. Together, it is possible to achieve an increase in the complexity of the use of raw materials with the organization and implementation of low-waste technology.
TECHNOLOGY FOR THE COMPLEX RECYCLING SLAGS OF COPPER PRODUCTION
S.T. Matkarimov, A.A. Yusupkhodjaev, Sh.T. Khojiev, B.T. Berdiyarov, Z.T. Matkarimov. Technology for the Complex Recycling Slags of Copper Production // Journal of Critical Reviews, Volume 7, Issue 5, April 2020. P. 214 – 220. , 2020
The article considers the inevitability of copper losses with slag and the possibility of reducing them by various methods and using local secondary technogenic formations. It has been established that the developed and widely used in industry technologies for decopperizing of slag only partially solve the problem and lead to significant irretrievable losses of metal with dump slag. The main factors affecting the magnitude of the casualties are established, and suggestions for reducing their negative impact are recommended. The use of perfect mixing devices is recommended, as in this case, it is possible to achieve a maximum reduction in the residual concentration of copper in the waste slag. Together, it is possible to make an increase in the complexity of the use of raw materials with the organization and implementation of low-waste technology.
Minimization of Copper Losses in Copper Smelting Slag During Electric Furnace Treatment
JOM, 2012
In the quest to achieve the highest metal recovery during the smelting of copper concentrates, this study has evaluated the minimum level of soluble copper in iron-silicate slags. The experimental work was performed under slag-cleaning conditions for different levels of Fe in the matte and for a range of Fe/SiO 2 ratios in the slag. All experiments were carried out under conditions where three phases were present (copper-matte-slag), which is the condition typically prevailing in many slag-cleaning electric furnaces. The %Fe in the electric furnace matte was varied between 0.5 wt.% and 11 wt.%, and two different Fe/SiO 2 ratios in the slag were used (targeted values were 1.4 and 1.6). All experiments were performed at 1200°C. From thermodynamic considerations, from industrial experience, and from the results obtained in this study, the minimum soluble copper content in the electric furnace slag is expected to be near 0.55 wt.% Cu. This level does not account for a portion of the copper present as mechanically entrained matte/metal droplets. Taking this into account, the current authors believe an overall copper level in discard slag between 0.7 wt.% and 0.8 wt.% can be obtained with optimal operating conditions. For these conditions, the copper losses in the slag are roughly 75% as dissolved copper and 25% as entrained matte and copper. Such conditions include operating the electric furnace at metallic copper saturation, maintaining the %Fe in the electric furnace matte between 6 wt.% and 9 wt.%, not exceeding a slag temperature of 1250°C, and controlling the Fe/SiO 2 ratio in the smelting furnace slag at £1.5. In addition, magnetite reduction needs to be performed efficiently during the slag-cleaning cycle so as to maintain a total magnetite content of £7 wt.% in the discard slag. The authors further consider that under exceptionally well-controlled conditions, a copper content in electric furnace discard slag between 0.55 wt.% and 0.7 wt.% can be obtained, by minimizing entrained matte and copper solubility in the discard slag.
Sustainability, 2020
Copper smelting slag is a solution of molten oxides created during the copper smelting and refining process, and about 1.5 million tons of copper slag are generated annually in Korea. The oxides in copper smelting slag include ferrous (FeO), ferric oxide (Fe 2 O 3), silica (SiO 2 from flux), alumina (AI 2 O 3), calcia (CaO) and magnesia (MgO). The main oxides in copper slag, which are iron oxide and silica, exist in the form of fayalite (2FeO·SiO 2). Since copper smelting slag contains high content of iron, and copper and zinc, common applications of copper smelting slag can be used in value-added products such as abrasive tools, roofing granules, road-base construction, railroad ballast, fine aggregate in concrete, etc. Some studies have attempted to recover metal values from copper slag. This research was intended to recover ferrous alloy contained Cu, a raw material of zinc, from copper slag, and produce reformed slag such as blast furnace slag for Portland cement. As a result, it was confirmed that with reduction smelting by carbon at temperatures above 1400 • C, it is possible to recover pig iron containing copper from copper smelting slag, and the addition of CaO in reduction smelting helped to reduce iron oxide in the fayalite and change the chemical and mineralogical composition of the slag. The copper oxide in the slag can be easily reduced and dissolved in the molten pig iron, and zinc oxide is also reduced to a volatile zinc, which is removed from the furnace as fumes, by carbon during the reduction process. When CaO addition is above 5%, acid slag is completely transformed into calcium silicate slag and is observed to be like blast furnace slag.
Minimization of copper losses to slag in matte smelting by colemanite addition
Solid State Sciences, 2012
In any copper production plant, more than two tons of slag is discarded with 0.7e2.3%Cu to produce each ton of copper. Therefore, minimizing copper losses is crucial during the copper matte smelting. In order to reduce the copper losses to slag in copper production, the addition of colemanite (a boron compound; 2CaO.3B 2 O 3 .5H 2 O) to slag was investigated in the present study. In experiments, the effects of other oxides such as ZnO, PbO, CaO and Al 2 O 3 which are generally known to be present in copper matte smelting slag were not taken into account by using a synthetic slag and a matte. Therefore, a slag consisting of FeOeFe 2 O 3 eSiO 2 and a matte with CueFeeS were only used. After producing synthetically a slag without copper and a matte, they were melted together at 1250 C under nitrogen atmosphere in silica crucibles. During these experiments, calcined colemanite addition in various amounts (0%, 2%, 4% and 6% of charge), and duration (0.5, 1, 2, 4 h) were chosen as variables. At the end of experiments, the results showed that when the calcined colemanite addition to synthetic slag-matte couple was increased from 0% to 6%, the copper content in resultant slag decreased substantially from about 1.50% to about 0.40%. It was also seen that the addition of calcined colemanite reduced the duration to reach equilibrium. By applying this method, the quality of production process could be improved as well as reducing the cost of processing of slag.
The analysis of physic chemical properties of metallurgical molten slags
А.А. Yusupkhodjayev, Sh.Т. Khojiev, J.S. Mamirkulov. The analysis of physic chemical properties of metallurgical molten slags// Сборник статей Международной научно-практической конференции “Управление социально-экономическими системами: теория, методология, практика”, 2017
Physicochemical properties of metallurgical slags wasted from copper production have been shown in this article. There are many information has been given about theoretical bases of processes which occurring during the smelting of copper-saved raw materials. And so main technological parameters of taking of copper-saved molten phase have been found which forms after smelting process.
Copper slags are usually considered a waste and characterized only by the final copper content. Large and increasing quantities are being produced and disposed of by stockpiling near the metallurgical plants. This paper stresses the importance of physico-chemical characterization when considering uses for slags and the possibility of recovering the valuable metals still remaining in this phase. The purpose of this work is to support and encourage a change in the classical perception of slag from a 'waste' to a 'resource'; promote the development of new technologies for treatment to recover residual values and encourage a search for new uses; with the ultimate objective of eliminating slag stockpiles thereby diminishing the environmental impact of smelting operations. Some of the results of experimental laboratory work done by the authors and examples of commercial applications will be shown. A promising future for valorization and utilization of slags is expected and will provide an example when considering the use of all the other large quantities of wastes generated by the mining industry.