Minerals Engineering最新文献_第6页

Insights into the separation of chalcopyrite from pyrite in Mg and Ca using gum acacia, xanthomonas campestris and guar gum: An experimental study validated by theoretical investigations 利用刺槐胶、黄单胞菌和瓜尔胶从黄铁矿中分离出镁和钙的黄铜矿的见解：通过理论研究验证的实验研究

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-15 DOI: 10.1016/j.mineng.2024.109047

Levie Mweene , Govinda Prasad Khanal

The surface chemistry of chalcopyrite (Cpy) and pyrite (Py) in presence of water containing with Mg and Ca was studied using gum acacia (GA), xanthomonas campestris (XC) and guar gum (GG) as depressants. The adsorption density of XC and GA beyond IEP of Cpy and Py in absence of metal ions was nil, whereas that of GG increased with increase in pH till at pH 9.4. However, in presence of Mg and Ca, the adsorption of XC was higher than that of GA and that of GG was higher onto mineral-metal than onto mineral. Further, the adsorption of XC, GA and GG onto mineral-Mg was more than that onto mineral-Ca and this was due to higher maximum molecular electrostatic potential (MESP) of Mg species (413.3 kcal/mol) relative to Ca species (253 kcal/mol). Additionally, the polysaccharides’ adsorption onto Py-Ca and Py-Mg was higher than onto Cpy-Mg and Cpy-Ca. On Cpy and Py with metal ions, the adsorption of XC and GA decreased with increase in pH attesting to polysaccharides anionicity. Theoretical analysis of complexes formed on Py and Cpy surfaces containing Mg and Ca, and polysaccharides was due to conventional hydrogen bonding, non-covalent and partially covalent bonding. Flotation of synthetic mixture of Py and Cpy (1:1) in presence of Mg at pH 9.5 performed better than other systems yielding Cu grade and recovery of 31.1 % and 85.6 % after 80 g/t of XC. Therefore, XC is a potential Py depressant in presence of Ca and Mg species.

以金合欢胶（GA）、黄单胞菌（XC）和瓜尔豆胶（GG）为抑制剂，研究了黄铜矿（Cpy）和黄铁矿（Py）在含有镁和钙的水中的表面化学性质。在没有金属离子的情况下，XC 和 GA 在 Cpy 和 Py 的 IEP 值之外的吸附密度为零，而瓜尔豆胶的吸附密度随着 pH 值的增加而增加，直到 pH 值为 9.4。然而，在存在镁和钙的情况下，XC 的吸附密度高于 GA，而 GG 在矿物-金属上的吸附密度高于在矿物上的吸附密度。此外，XC、GA 和 GG 在矿物-金属（Mg）上的吸附量高于在矿物-金属（Ca）上的吸附量，这是由于 Mg 物种的最大分子静电势（MESP）（413.3 kcal/mol）高于 Ca 物种（253 kcal/mol）。此外，多糖在 Py-Ca 和 Py-Mg 上的吸附力高于在 Cpy-Mg 和 Cpy-Ca 上的吸附力。在含有金属离子的 Cpy 和 Py 上，XC 和 GA 的吸附量随着 pH 值的增加而减少，这证明了多糖的阴离子性。对含有镁和钙的 Py 和 Cpy 表面形成的复合物进行的理论分析表明，多糖是由于传统的氢键、非共价键和部分共价键形成的。在 pH 值为 9.5、有镁存在的条件下，Py 和 Cpy（1:1）合成混合物的浮选效果优于其他系统，80 克/吨 XC 的铜品位和回收率分别为 31.1% 和 85.6%。因此，在钙和镁存在的情况下，XC 是一种潜在的 Py 抑制剂。

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引用次数: 0

Phosphorus removal from steelmaking slag by selective leaching in the steel pickling waste liquor 在钢铁酸洗废液中通过选择性浸出去除炼钢渣中的磷

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-15 DOI: 10.1016/j.mineng.2024.109051

Yao-hui Yu , Chuan-ming Du , Jian-guo Wang , Jian-qiang Lu

Steelmaking slag and steel pickling waste liquor (SPWL) are two kinds of by-products in steel plants. The existence of phosphorus (P) in steelmaking slag is the main factor affecting its reuse within the steelmaking process. To remove P from steelmaking slag with a low-cost method, selective leaching was proposed by using SPWL as a leaching agent. SPWL generally contains a small amount of Fe³⁺ ions, and thus the effect of Fe³⁺ content in SPWL on the dissolution behavior (especially P element) of steelmaking slag was investigated, as well as the pH value and steelmaking slag type. The dissolution ratios of P from various slags in the SPWL containing 500 ppm Fe³⁺ exceeded 95 % at pH 1.5 while those of Fe, Mn, and Al were very low, exhibiting satisfied selective leaching of P. Increasing pH value and Fe³⁺ content (in SPWL) resulted in a decreasing P dissolution ratio while exerting an insignificant effect on the dissolution of other elements. The FeHPO₄⁺ was predicted as the predominant species during leaching and the transformation of FeHPO₄⁺ to FePO₄ could be present. When the SPWL containing 800 ppm Fe³⁺ was used, FePO₄ was observed in the residues after leaching at pH 2.0, resulting in a worse removal of P from slag. However, the residues including massive valuable components had an extremely low P content after leaching in the SPWL containing 500 ppm Fe³⁺ at pH 1.5, which can be used as a flux in the metallurgical process. To ensure a high P removal rate from steelmaking slag and to prevent FePO₄ precipitation during leaching, a relatively low pH and Fe³⁺ content in the SPWL are necessary.

炼钢废渣和钢铁酸洗废液（SPWL）是钢铁厂的两种副产品。炼钢废渣中磷（P）的存在是影响其在炼钢过程中再利用的主要因素。为了以低成本的方法去除炼钢渣中的磷，有人提出使用 SPWL 作为浸出剂进行选择性浸出。SPWL 通常含有少量 Fe3+ 离子，因此研究了 SPWL 中 Fe3+ 含量对炼钢渣溶解行为（尤其是 P 元素）的影响，以及 pH 值和炼钢渣类型。在 pH 值为 1.5 时，含有 500 ppm Fe3+ 的 SPWL 中各种炉渣中 P 元素的溶出率超过 95%，而 Fe、Mn 和 Al 元素的溶出率则非常低，这表明 P 元素的选择性浸出得到了满足。据预测，FeHPO4+ 是浸出过程中的主要物种，可能存在 FeHPO4+ 向 FePO4 的转化。当使用含 800 ppm Fe3+ 的 SPWL 时，在 pH 值为 2.0 的浸出条件下，残渣中出现了 FePO4，导致矿渣中 P 的去除率降低。然而，在 pH 值为 1.5、含 500 ppm Fe3+ 的 SPWL 中浸出后，残渣（包括大量有价值成分）中的 P 含量极低，可用作冶金过程中的助熔剂。为了确保炼钢渣中 P 的高去除率，并防止在浸出过程中产生 FePO4 沉淀，SPWL 中的 pH 值和 Fe3+ 含量必须相对较低。

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引用次数: 0

Research status of new technology for magnetization roasting and reduction of refractory iron ore in China 中国难处理铁矿石磁化焙烧还原新技术研究现状

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-15 DOI: 10.1016/j.mineng.2024.109041

Ying Xu , Enshuo Li , Yanbo Zhang , Lukuo Hong , Xulong Yao

Iron ore is the raw material for smelting steel, and the steel smelting industry occupies an important position in the development of the national economy. In China, the reserves of iron ore are large, but the iron ore has the characteristics of low grade and sorting is difficult, which limits the application of domestic iron ore. In order to meet the demand for raw materials in China’s steel industry, China has long imported iron ore from other countries. Therefore, China’s strong dependence on imported iron ore and the low utilization rate of domestic iron ore need to be solved urgently. Studies have shown that magnetic roasting reduction technology is an effective method to reduce the iron ore phase in iron ore and improve the magnetic properties of iron ore. And magnetic roasting reduction technology can optimize the magnetic separation selectivity of iron ore. Through the magnetic separation of the iron ore after magnetization roasting, high-grade fine iron ore can be obtained. The magnetization roasting-magnetic separation process can effectively improve the enrichment and separation efficiency of domestic ores and improve the utilization rate of domestic ores. In this paper, the reduction effect of siderite, hematite and limonite as the main iron ore phase after carbon-based roasting reduction technology or hydrogen-based roasting reduction technology and the research status of the quality of concentrate iron ore after magnetic separation are reviewed, and the best reduction system of different ore reduction roasting process is put forward. The transformation law and reaction mechanism of each mineral phase in the process of carbon-based roasting reduction and hydrogen-based roasting reduction of ores with different iron ore phases are introduced. The future development direction of magnetic roasting reduction technology is analyzed, which has guiding significance for the selection of magnetic roasting reduction technology for other refractory iron ores and the development of subsequent mineral enrichment and separation technology.

铁矿石是冶炼钢铁的原料，钢铁冶炼工业在国民经济发展中占有重要地位。我国铁矿石储量大，但具有品位低、分选难等特点，限制了国产铁矿石的应用。为了满足中国钢铁工业对原材料的需求，中国长期从其他国家进口铁矿石。因此，中国对进口铁矿石的依赖性强、国产铁矿石利用率低的问题亟待解决。研究表明，磁性焙烧还原技术是降低铁矿石中铁矿相、改善铁矿石磁性能的有效方法。而且磁焙烧还原技术可以优化铁矿石的磁选选择性。通过对磁化焙烧后的铁矿石进行磁选，可以获得高品位的精铁矿石。磁化焙烧-磁选工艺能有效提高国产矿的富集和选别效率，提高国产矿的利用率。本文综述了以菱铁矿、赤铁矿和褐铁矿为主体的铁矿石相经碳基焙烧还原工艺或氢基焙烧还原工艺后的还原效果以及磁选后精铁矿石质量的研究现状，提出了不同矿石还原焙烧工艺的最佳还原体系。介绍了不同铁矿相矿石在碳基焙烧还原和氢基焙烧还原过程中各矿物相的转化规律和反应机理。分析了磁性焙烧还原技术的未来发展方向，对其他难选铁矿石磁性焙烧还原技术的选择及后续富矿、选矿技术的发展具有指导意义。

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引用次数: 0

Impact of acid surface pretreatment on the hydrophobic agglomeration of micro-fine ilmenite and titanaugite in flotation 浮选中酸性表面预处理对微细钛铁矿和钛铁矿疏水团聚的影响

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-15 DOI: 10.1016/j.mineng.2024.109050

Yusheng Du , Qingyou Meng , Zhitao Yuan , Chong Han , Lixia Li , Jiwei Lu , Ting Liu

Acid surface pretreatment was employed to realize the selective hydrophobic agglomeration of micro-fine ilmenite in flotation. Microflotation and artificially mixed mineral experiments manifested that after acid surface pretreatment, the recovery of micro-fine ilmenite with the increase of NaOL concentration and the floatability difference of micro-fine ilmenite and titanaugite increased significantly. Zeta potential and contact angle analyses suggested that acid surface pretreatment intensified the adsorption of NaOL on ilmenite surfaces while reducing it on titanaugite surfaces. Turbidity, optical microscope, and EDLVO theory analyses attested that the hydrophobic attraction dominated in a short particle spacing in NaOL solution. Following acid surface pretreatment, the hydrophobic agglomeration between micro-fine ilmenite particles enhanced in NaOL solution due to increased hydrophobic attraction. In contrast, the hydrophobic attraction and agglomeration between micro-fine titanaugite particles as well as between micro-fine ilmenite and titanaugite particles weakened. Overall, acid surface pretreatment improved the selective adsorption of NaOL and the selective hydrophobic agglomeration of micro-fine ilmenite, resulting in enhanced separation efficiency and recovery of micro-fine ilmenite.

采用酸性表面预处理实现了微细钛铁矿在浮选中的选择性疏水团聚。微浮选和人工混矿实验表明，酸性表面预处理后，微细钛铁矿的回收率随NaOL浓度的增加而提高，微细钛铁矿与钛铁矿的可浮性差异显著增大。Zeta 电位和接触角分析表明，酸性表面预处理增强了 NaOL 在钛铁矿表面的吸附，同时降低了 NaOL 在钛铁矿表面的吸附。浊度、光学显微镜和 EDLVO 理论分析表明，在 NaOL 溶液中，疏水吸引力在短颗粒间距中占主导地位。经过酸性表面预处理后，由于疏水吸引力增强，在 NaOL 溶液中，微细钛铁矿颗粒之间的疏水聚结增强。相比之下，微细钛白粉颗粒之间以及微细钛铁矿和钛白粉颗粒之间的疏水吸引力和团聚作用减弱。总之，酸性表面预处理改善了 NaOL 的选择性吸附和微细钛铁矿的选择性疏水团聚，从而提高了微细钛铁矿的分离效率和回收率。

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引用次数: 0

Beneficiation of Li-bearing sedimentary claystone by centrifugation 利用离心法选矿含锂沉积粘土岩

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-14 DOI: 10.1016/j.mineng.2024.109042

Angela Manka Tita , Emmanuel Atta Mends , Shokrullah Hussaini , John Thella , York Smith , Pengbo Chu

The global shift towards electrification has led to an unprecedented demand for lithium (Li) – a key element in Li-ion battery technology. Sedimentary claystones found in Nevada have recently emerged as a new resource for Li. However, these claystones pose challenges to process due to their intricate and complex mineral composition. One of the significant challenges is that the claystones contain significant amounts of carbonate minerals such as calcite, which results in excessive processing reagent consumption. This study investigates the application of centrifugation as a gravity separation method for removing calcite from one Nevada sedimentary claystone. By varying the centrifugation time and rotation speed (RPM), a maximum of 81 % Li recovery with 82 % calcium (Ca) rejection can be obtained in the clay fraction. The study also showed that the beneficiation can reduce acid consumption during the leaching process by approximately 14 %. This study not only validates centrifugation as an effective technique to upgrade the Li sedimentary claystones, but also encourages further research of advanced gravity separation technologies for the pre-treatment of Li-bearing sedimentary claystones.

全球向电气化的转变导致了对锂（Li）前所未有的需求，而锂（Li）是锂离子电池技术的关键元素。最近，内华达州发现的沉积粘土岩成为锂的新资源。然而，这些粘土岩因其错综复杂的矿物成分而给加工带来了挑战。其中一个重大挑战是粘土岩中含有大量的碳酸盐矿物，如方解石，这导致了过多的加工试剂消耗。本研究调查了离心分离法作为重力分离法的应用，以去除内华达州一种沉积粘土岩中的方解石。通过改变离心时间和转速（RPM），粘土部分的锂回收率最高可达 81%，钙（Ca）去除率为 82%。研究还表明，选矿可将浸出过程中的酸消耗量减少约 14%。这项研究不仅验证了离心分离法是提升锂沉积粘土岩的有效技术，还鼓励进一步研究先进的重力分离技术，用于含锂沉积粘土岩的预处理。

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引用次数: 0

Intensifying the selective sulfidation of nickel in saprolitic laterites by sodium salts 钠盐强化红土酸性岩中镍的选择性硫化作用

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-10 DOI: 10.1016/j.mineng.2024.109022

Chen Li, Wei Liu, Fen Jiao, Tianfu Zhang, Junwei Han, Wenqing Qin

Nickel sulfide concentrate was an important raw material for battery-grade nickel sulfate. To efficiently separate nickel from saprolitic laterite to product nickel sulfide concentrate, a novel and clean sulfidation-flotation process aimed to enhance selective sulfidation and particle growth through sodium carbonate was proposed herein. The effects of temperature, time, sulfur dosage, Na salts, and carbon additions on the selective sulfidation of nickel are systematically studied. Experimental results show that sodium carbonate can destroy the silicate structure, release nickel in the silicate, and form a low-melting point phase, promoting the aggregation of nickel sulfide, thereby achieving the purpose of promoting the sulfidation of nickel and the growth of synthetic nickel matte particles. Under the optimal conditions, 85.7% Ni and 27.1% Fe could be sulfated.

硫化镍精矿是生产电池级硫酸镍的重要原料。为了有效地从红土镍矿中分离出镍，生产出硫化镍精矿，本文提出了一种新型、清洁的硫化-浮选工艺，旨在通过碳酸钠增强选择性硫化和颗粒生长。系统研究了温度、时间、硫剂量、Na 盐和碳添加量对镍选择性硫化的影响。实验结果表明，碳酸钠能破坏硅酸盐结构，释放硅酸盐中的镍，并形成低熔点相，促进硫化镍的聚集，从而达到促进镍的硫化和合成镍锍颗粒生长的目的。在最佳条件下，可硫化 85.7% 的镍和 27.1% 的铁。

引用次数: 0

Enhanced Machine Learning Molecular Simulations for optimization of flotation selectivity: A perspective paper 用于优化浮选选择性的增强型机器学习分子模拟：展望论文

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-10 DOI: 10.1016/j.mineng.2024.109016

D. Dell’Angelo , Y. Foucaud , J. Mesquita , J. Lainé , H. Turrer , M. Badawi

The recovery of valuable minerals in froth flotation industry relies on finding inexpensive and environmentally friendly reagents that selectively adsorb upon surfaces and interfaces. Computer simulations, especially when extended, provide access to detailed mechanistic information on solvent configurations and may ascertain crucial dynamical events over the adsorption process. Further, in silico throughput screening can prevent both the high cost of experiments and the related risks to the environment. Yet, a better compromise between accuracy and computational cost must be met. Machine learning (ML) simulations may ease the latter and suggest solidophilic reagents able to improve the flotation efficiency, shedding new light on discerning descriptors able to accurately capture the nature of the molecule-surface interaction. In this work, our recent advancements in modeling of new accurate mineral-water interfaces based on active learning of ab initio molecular dynamics trajectories have been introduced. The case of some habitual oxides and minerals liberated in mining industry will be taken as examples.

在泡沫浮选工业中回收有价值的矿物有赖于找到能选择性吸附表面和界面的廉价环保试剂。计算机模拟，尤其是扩展模拟，可提供有关溶剂配置的详细机理信息，并可确定吸附过程中的关键动态事件。此外，硅学高通量筛选可以避免高昂的实验成本和相关的环境风险。然而，必须在准确性和计算成本之间取得更好的平衡。机器学习（ML）模拟可以缓解后者的问题，并提出能够提高浮选效率的亲固试剂，为辨别能够准确捕捉分子与表面相互作用性质的描述符提供新的思路。在这项工作中，介绍了我们最近在基于主动学习 ab initio 分子动力学轨迹的新型精确矿物-水界面建模方面取得的进展。我们将以采矿业中释放的一些常见氧化物和矿物为例。

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引用次数: 0

Pretreatment and recovery of base metals from oxidised ores by froth flotation technology – A review 利用泡沫浮选技术预处理和回收氧化矿石中的贱金属 - 综述

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-08 DOI: 10.1016/j.mineng.2024.109024

Nompumelelo Nkosi, Willie Nheta

Base metals are among the key drivers propelling the economy’s expansion due to their widespread uses and applications. They are used as input factors in the construction of houses, transportation, plants, machinery, pipes, electrical cables, etc. As high-grade base metal sulphide deposits continue to diminish rapidly, the focus is shifting towards recovering these metals from lower grade oxidised and mixed ore deposits. This article critically discusses several research attempts made on the pretreatment of oxidised and mixed ores to increase base metal recoveries by froth flotation, as well as their benefits and drawbacks. Finally, the paper proposes further research and suggest steps forward to pretreatment of oxidised base metals. It is strongly believed that with proper pretreatment of oxidised base metals prior to flotation, when established as a viable technology recognised by industry, will contribute to the sustainability of base metal industry.

贱金属因其广泛的用途和应用而成为推动经济发展的主要动力之一。它们被用作建造房屋、交通、工厂、机械、管道、电缆等的投入要素。随着高品位基本金属硫化物矿床不断迅速减少，人们正将重点转向从低品位氧化矿床和混合矿床中回收这些金属。本文批判性地讨论了为通过泡沫浮选提高基本金属回收率而对氧化矿石和混合矿石进行预处理的几项研究尝试，以及它们的优点和缺点。最后，本文提出了进一步研究的建议，并提出了氧化贱金属预处理的步骤。我们坚信，在浮选前对氧化贱金属进行适当的预处理，一旦成为一项得到业界认可的可行技术，将有助于贱金属行业的可持续发展。

引用次数: 0

Characterization and leaching options of a Zn and Ni-containing secondary sulfide 含锌和镍次生硫化物的特征和浸出方案

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-08 DOI: 10.1016/j.mineng.2024.109034

Antti Porvali, Tuomo Mäkelä, Jarno Mäkinen

A sulfidic secondary raw material rich in Ni (millerite) and Zn (sphalerite) as well as mixed Ni-Fe-S sulfides was characterized and investigated for its leaching behavior under atmospheric direct acid leaching system utilizing air or oxygen, H₂SO₄, temperature ranges, and gas flow rates. The goal was to investigate extractability of the main elements (Ni, 15 wt% and Zn, 16 wt%) in the raw material whether both Ni and Zn could be extract simultaneously, or whether the material is more amenable to selective leaching, impacting the subsequent process options. Batch leaching experiments were performed in a 1 L and 0.5 L systems in two complementary leaching series. Ni was not appreciably extracted apart from the Ni sulfates present in the raw material apart from the experiments utilizing O₂(g). The Ni dissolution did not readily occur until Zn extraction was finished and solution oxidation–reduction potential (ORP) increased to ca. 450 mV (vs. Ag/AgCl), and only reached ca. 50 % extraction at t = 24 h in T=90 °C and pH=1. The leach residue Zn content closely followed the ORP, achieving a minimum (0.1 wt% Zn) at E=471 mV (vs. Ag/AgCl). The most rapid leaching kinetics for ZnS was with excess acid, followed by experiments with O₂(g). Decent kinetics were observed in response surface design of experiments (T=30, 50, 70 °C; m_(H2SO4)/m_{(Raw material)} = 0.6, 0.9, 1.2 g/g), allowing Zn extraction in < 6h. as it was possible to produce upgraded NiS (20 wt%) while extracting most of the Zn (99 %) under several experimental conditions, ranging from high T (90 °C) and limited constant acidity (pH 1) to low temperature (T=50 °C) and high excess acidity. It was shown that it is possible in an atmospheric process to selectively extract Zn while keeping majority of Ni in the leach residue. Selective extraction of Zn allows separation of Ni and Zn into separate materials feeds to be subsequently processed: Zn stream in a Zn process, and Ni-containing residue in a Ni smelter.

研究人员对一种富含镍（千枚岩）和锌（闪锌矿）以及混合镍-铁-硒硫化物的硫化二次原料进行了表征，并在利用空气或氧气、H2SO4、温度范围和气体流速的大气直接酸浸出系统下对其浸出行为进行了研究。目的是研究原材料中主要元素（镍，15 wt%；锌，16 wt%）的可萃取性，是镍和锌可同时萃取，还是材料更适合选择性浸出，从而影响后续工艺选择。在 1 升和 0.5 升系统中进行了两个互补浸出系列的批量浸出实验。除了使用 O2（g）的实验外，镍并没有从原料中的镍硫酸盐中明显提取出来。在锌萃取结束、溶液氧化还原电位（ORP）升高至约 450 mV（与 Ag/AgCl 相比）之前，镍不会轻易溶解，只有在温度=90 °C、pH=1 的条件下，t = 24 小时时，萃取率才达到约 50%。浸出残渣中的锌含量紧随 ORP 的变化，在 E=471 mV（相对于 Ag/AgCl）时达到最小值（0.1 wt% Zn）。ZnS 最快速的浸出动力学是过量酸，其次是 O2（g）实验。在响应面设计实验（T=30、50、70 °C；m(H2SO4)/m(原料) = 0.6、0.9、1.2 g/g）中观察到了适当的动力学，可以在 < 6 小时内萃取出锌，因为在几种实验条件下，从高温（90 °C）和有限的恒定酸度（pH 值为 1）到低温（T=50 °C）和高过量酸度，都有可能在萃取出大部分锌（99 %）的同时生产出升级的 NiS（20 wt%）。实验表明，在常压工艺中可以选择性地萃取锌，同时在浸出残渣中保留大部分镍。选择性萃取锌可以将镍和锌分离成不同的原料，然后再进行加工：锌工艺中的锌流和镍冶炼厂中的含镍残渣。

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引用次数: 0

Simulation and analysis of high-pressure grinding rolls performance based on DEM-PRM 基于 DEM-PRM 的高压磨辊性能模拟与分析

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-07 DOI: 10.1016/j.mineng.2024.109039

Jianbo Guo , Shuai Wang , Zhengbin Liu , Guoqiang Wang , Shuwei Wu , Wei Guan , Haoyan Zhang

High-pressure grinding rolls (HPGR) is an energy-efficient size reduction equipment widely used in the mining industry. Simulating and analyzing its performance is of significant importance. This paper focuses on the comminution process of HPGR and simulates it using the discrete element method (DEM) and particle replacement model (PRM). Furthermore, the combination of DEM simulation and Box-Behnken designs (BBD) is employed. The effects of roll diameter, roll width, operating gap, and roll speed on HPGR performance are investigated using analysis of variance (ANOVA) and response surface methodology (RSM). A performance prediction model is established through regression analysis, and numerical optimization of performance indicators under different weight ratios is conducted. The results indicate that rolls with a high aspect ratio generally achieve better performance. In addition, the effect of feed particle size on throughput and power is negatively correlated, while the effect on product fineness is not obvious. Based on this, dynamic adjustments of the operating gap, roll speed and feed particle size can be made to meet the optimal design of HPGR performance.

高压辊磨机（HPGR）是一种广泛应用于采矿业的节能减小粒度设备。模拟和分析其性能具有重要意义。本文重点研究了高压辊磨机的粉碎过程，并使用离散元法（DEM）和颗粒置换模型（PRM）对其进行了模拟。此外，还采用了离散元模拟和盒式贝肯设计（BBD）相结合的方法。使用方差分析（ANOVA）和响应面方法（RSM）研究了轧辊直径、轧辊宽度、工作间隙和轧辊速度对 HPGR 性能的影响。通过回归分析建立了性能预测模型，并对不同重量比下的性能指标进行了数值优化。结果表明，高纵横比的轧辊通常能获得更好的性能。此外，进料粒度对产量和功率的影响呈负相关，而对产品细度的影响不明显。在此基础上，可以对工作间隙、轧辊速度和给料粒度进行动态调整，以达到 HPGR 性能的最佳设计。

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引用次数: 0