Physicochemical Problems of Mineral Processing最新文献

The role of microbubble dose in combined microflotation of fine particles 微气泡剂量在细颗粒联合微气浮中的作用

Physicochemical Problems of Mineral Processing Pub Date : 2024-07-02 DOI: 10.37190/ppmp/190630

Nickolay Rulyov

{"title":"The role of microbubble dose in combined microflotation of fine particles","authors":"Nickolay Rulyov","doi":"10.37190/ppmp/190630","DOIUrl":"https://doi.org/10.37190/ppmp/190630","url":null,"abstract":"Flotation of small particles is one of the global challenges facing the mineral raw materials processing industry. Large amounts of non-ferrous and rare metals are lost in the flotation tailings in the form of mineral particles below 15 µm in size as a result of the low effectiveness of their capture by coarse bubbles generated in conventional flotation machines. The method of combined microflotation, developed in recent years, uses conventional coarse bubbles (CB) and microbubbles (MB) produced in the stand-alone generator of air-in-water microdispersion, which serves as the flotation carriers. Depending on the MB dose, the effect of their application may be positive or negative. The theoretical analysis of various mechanisms of particle transfer onto the surface of coarse bubbles and further into the froth layer allowed to obtain the formula for the optimal MB dose f=dd/2dprp, where dd is MB size; dp and rp respectively are the size and the density of particles. Experiments performed on the copper ore flotation tailings at the Atalaya Mining (Spain) and Chaarat Kapan (Armenia) concentrators showed that, besides the optimal MB dose in the range of 1-3 ml/g, there is another optimal MB dose in the range of 10-20 ml/g, where the copper recovery increases by several percent compared to the reference test (f = 0). The deep minimum in copper recovery is observed in the area between the optimal MB doses, which is by several percent lower than the value in the reference test.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":"26 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141685430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The inhibition mechanism of esterified starch on flotation separation of fluorite and calcite 酯化淀粉对萤石和方解石浮选分离的抑制机理

Physicochemical Problems of Mineral Processing Pub Date : 2024-07-02 DOI: 10.37190/ppmp/190698

Bangqi Wei, Jie Li, Zhao Cao, Saisai Ma, Yuhan Zhang

{"title":"The inhibition mechanism of esterified starch on flotation separation of fluorite and calcite","authors":"Bangqi Wei, Jie Li, Zhao Cao, Saisai Ma, Yuhan Zhang","doi":"10.37190/ppmp/190698","DOIUrl":"https://doi.org/10.37190/ppmp/190698","url":null,"abstract":"Herein, the flotation behavior of fluorite and calcite was examined before and after starch esterification through mineral flotation experiments. Moreover, the adsorption action mechanisms on minerals before and after starch esterification were investigated using methods such as solution surface tension measurement, infrared spectroscopy, and extended Derjaguin–Landau–Verwey–Overbeek theory. The results showed that after starch esterification (esterified starch), there was a greater difference in the mineral recovery rate compared to before starch esterification (ordinary starch), with a better inhibition effect on calcite. The interaction between mineral surfaces and ordinary starch was weaker than the interaction between minerals and esterified starch. In particular, after starch esterification, the surface tension increased, two minerals contact angle decreased, the surface potential became more negative, and the difference in the mineral recovery rate was greater than before starch esterification. After the interaction between minerals and esterified starch, calcite particles displayed good dispersibility, while the cohesion between calcite particles and sodium oleate particles decreased; notably, the effect on fluorite was opposite. Calcite and esterified starch exhibited chemical adsorption, impeding the adsorption of sodium oleate onto calcite and resulting in calcite inhibition. The interaction between fluorite surface and esterified starch involved electrostatic adsorption, with sodium oleate chemically adsorbed onto the fluorite surface. Chemical adsorption proved stronger than electrostatic adsorption, enabling sodium oleate to capture fluorite.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":"128 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancement of ilmenite magnetic properties by oxidation roasting and magnetic separation 通过氧化焙烧和磁选提高钛铁矿的磁性能

Physicochemical Problems of Mineral Processing Pub Date : 2024-07-02 DOI: 10.37190/ppmp/190706

Jiantao Gu, Zhitao Yuan, Yusheng Du, Wei Ji Lu, Chuan Yang, Hongyang Lv

引用次数: 0

Adaptive control method and experimental study of cone crusher based on aggregate online detection 基于骨料在线检测的圆锥破碎机自适应控制方法及实验研究

Physicochemical Problems of Mineral Processing Pub Date : 2024-05-15 DOI: 10.37190/ppmp/188759

Huaiying Fang, Xiaosheng Ji, Jianhong Yang, Yuxuan Yang, Tianchen Ji, Chaoming Wei

{"title":"Adaptive control method and experimental study of cone crusher based on aggregate online detection","authors":"Huaiying Fang, Xiaosheng Ji, Jianhong Yang, Yuxuan Yang, Tianchen Ji, Chaoming Wei","doi":"10.37190/ppmp/188759","DOIUrl":"https://doi.org/10.37190/ppmp/188759","url":null,"abstract":"The size of the discharge outlet of a cone crusher directly impacts the size of the aggregate produced. However, the discharge outlet is still adjusted manually, which has a significant error and affects production efficiency. For this reason, this study proposed an adaptive control method for cone crushers based on aggregate online detection. Firstly, the aggregate image was segmented using an instance segmentation model and the anchor and structure of the model were optimised. Then, this study proposed an evaluation method for quickly and accurately assessing the overall segmentation effect of network models. By comparing the results with those before optimisation, the accuracy of the optimised network model was improved from 0.923 to 0.940. Finally, an adaptive control experiment was conducted based on the online aggregate detection results. The experimental results showed that the discharge particle size distribution of the cone crusher becomes more stable after intelligent control is added, with the variance of the proportion of cumulative gradation at 15 mm decreased from 34.3 to 14.4. These results indicated that the developed adaptive control system effectively controls the fine processing of coarse aggregates and significantly improves the quality of aggregate crushing and processing.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":"34 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Ca2+/Mg2+ ions in recycled water on the reverse flotation properties of iron oxides 循环水中的 Ca2+/Mg2+ 离子对氧化铁反浮选特性的影响

Physicochemical Problems of Mineral Processing Pub Date : 2024-05-10 DOI: 10.37190/ppmp/188465

Min Tang, Yan Wu, Jiahao Fu

{"title":"Effects of Ca2+/Mg2+ ions in recycled water on the reverse flotation properties of iron oxides","authors":"Min Tang, Yan Wu, Jiahao Fu","doi":"10.37190/ppmp/188465","DOIUrl":"https://doi.org/10.37190/ppmp/188465","url":null,"abstract":"Water quality, particularly hardness, plays an important role in affecting the floatability of minerals as it interferes with the chemical/electro-chemical characteristics of mineral surfaces and their interactions with flotation reagents. It could become unpredictable when water sources characterized by different calcium or magnesium ion distributions were involved. This study aimed to identify the role of Ca2+/Mg2+ ions in the recycled water on the cationic reverse flotation selectivity of iron oxides through a series of bench/micro flotation tests, zeta potential, powder contact angle, and Fourier Transform Infrared (FTIR), etc. The results pointed out that the use of recycled tailing water deteriorates the flotation selectivity and dilutes the concentrates. This can be largely attributed to the presence of Ca2+ ions at higher concentrations as they induce a drop in the Fe recovery and an increase in SiO2 content while an increase in the content of Mg2+ ions seems to have little effect on the quality of concentrate. As evidenced by the data from micro-flotation, powder contact angle, zeta potentials, and FTIR, a hydrophilic colloidal layer formed by Ca-based hydrolyzed compounds, such as Ca(OH)+ or, CaCO3(s), etc., on quartz could change its zeta potentials and disturb its interactions with a cationic collector. They also play a role in weakening the flocculation of starch on hematite probably by pre-locking the acidic groups on the starch remnants and contracting their configurations, thus preventing their adsorption on mineral surfaces. However, magnesium ions seem to be beneficial to in strengthening the flocculation of starch on hematite as magnesium-based species could act as adsorption bridges of between starch and mineral surfaces.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140992959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coal slurry foam image enhancement based on multiscale convolutional network 基于多尺度卷积网络的煤泥泡沫图像增强技术

Physicochemical Problems of Mineral Processing Pub Date : 2024-05-06 DOI: 10.37190/ppmp/188277

XianWu Huang, Yuxiao Wang, ZhiHong Zhu, Haili Shang, Zhao Cao

{"title":"Coal slurry foam image enhancement based on multiscale convolutional network","authors":"XianWu Huang, Yuxiao Wang, ZhiHong Zhu, Haili Shang, Zhao Cao","doi":"10.37190/ppmp/188277","DOIUrl":"https://doi.org/10.37190/ppmp/188277","url":null,"abstract":"Collecting information on the flotation foam characteristics is important for controlling flotation production conditions. Foam images acquired during coal slurry flotation are affected by factors such as ambient lighting, contributing to uneven grayscale images with low brightness and contrast. Brightness enhancement of foam images is often required when using network models to extract feature information from the images. The paper proposes a foam image brightness enhancement algorithm based on a multiscale convolutional neural network. The method employs a skip connection structure based on a summation connection design based on logarithmic functions and introduces a loss function based on logarithmic transformation in the network. At the same time, branching networks of different complexity are designed in the network to further help alleviate the gradient vanishing problem. The experimental results show that when evaluating the quality of images after brightness enhancement of foam images and the public dataset MIT, the numerical results of using the proposed skip connection structure in the proposed network are overall better than using the resblock structure, and the proposed loss function is better than is better than using the L2 loss function. The proposed network greatly improves the visual effect of flotation foam images and lays the foundation for feature extraction of flotation foam images and intelligent flotation production.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":"14 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141006016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of a novel depressant PMAA for the separation of fluorite from calcite using NaOl as a collector 以 NaOl 为捕集剂从方解石中分离萤石的新型抑制剂 PMAA 评估

Physicochemical Problems of Mineral Processing Pub Date : 2024-05-04 DOI: 10.37190/ppmp/188272

Xiaofeng Zhang, Qi Li, Wenqing Qin, Cheng Liu, Siyuan Yang

引用次数: 0

Influence of pH and salt solution on the sedimentation properties of fine bauxite tailings pH 值和盐溶液对铝土矿尾矿沉降特性的影响

Physicochemical Problems of Mineral Processing Pub Date : 2024-03-21 DOI: 10.37190/ppmp/186326

Haihao Yu, Zhixiao Bai

{"title":"Influence of pH and salt solution on the sedimentation properties of fine bauxite tailings","authors":"Haihao Yu, Zhixiao Bai","doi":"10.37190/ppmp/186326","DOIUrl":"https://doi.org/10.37190/ppmp/186326","url":null,"abstract":"Bauxite tailings slurry is a type of solid waste produced in the process of bauxite washing and beneficiation. It has poor engineering properties, that is, self-consolidation settlement unusually cannot be completed during several decades. To investigate the sedimentation properties of bauxite tailings, bauxite tailings slurry, phyllite residual soil, and kaolinite, we conduct sedimentation tests on these materials in varying pH and salt solution environments. The influence mechanism of the surface electrical properties of clay particles on the settlement of tailings slurry is investigated using the zeta potential test. The findings reveal that increases in the cation concentration and valence state lead to compression of the electric double layer on the surface of three types of soil particles, resulting in a decline in the repulsive potential energy and an increase in the gravitational potential energy. This in turn contributes to a reduction in the settling stable void ratio. As the pH increases, the zeta potentials of the three soils gradually decrease from positive to negative. A change in the pH at the isoelectric point, PZCedge, triggers the transformation of the kaolinite mineral arrangement. When the pH is either greater than or less than the isoelectric point, an increase or decrease in the pH results in expansion of the electric double layer of the clay particles and an increase in the pore content. The results of this study suggest that bauxite tailings mud is more likely to settle in an acidic environment than in an alkaline environment, thus an acidic settling environment should be utilized for bauxite tailings produced in industrial production.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":" 120","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140221244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation 通过石灰转化、共浸出和逐步沉淀法从稀土熔盐电解渣中回收稀土和锂

Physicochemical Problems of Mineral Processing Pub Date : 2024-03-21 DOI: 10.37190/ppmp/186333

Xinglan Li, Peidi Luo, Zishuai Liu, Xuekun Tang, Baqun Zhang, Jiangfeng Guo

{"title":"Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation","authors":"Xinglan Li, Peidi Luo, Zishuai Liu, Xuekun Tang, Baqun Zhang, Jiangfeng Guo","doi":"10.37190/ppmp/186333","DOIUrl":"https://doi.org/10.37190/ppmp/186333","url":null,"abstract":"The rare earth molten salt electrolytic slag (REMSES) has recently attracted significant attention due to its potential environmental hazards and high content of rare earths and lithium, leading to a surge in recycling efforts. In this study, we propose and demonstrate a novel and straightforward process for the simultaneous extraction of rare earths and lithium from REMSES through lime transformation and sulfuric acid leaching at low temperatures. Firstly, during the lime transformation process, REMSES is converted into hydroxides that can be easily dissolved in acids. Secondly, REEs and Li present in the slag are co-extracted using a conditional sulfuric acid leaching method, resulting in 95.72% REEs leaching efficiency and 99.41% Li leaching efficiency under optimal conditions. Finally, REEs and Li in the solution are precipitated using oxalic acid and trisodium phosphate with precipitation efficiencies of 99.02% for REEs and 94.85% for Li respectively. This innovative process enables the conversion of REEs and lithium from REMSES into high-purity products (a mixture of REOs with 99.31% purity; Li3PO4 with 98.93% purity), thereby facilitating their valuable utilization.","PeriodicalId":508651,"journal":{"name":"Physicochemical Problems of Mineral Processing","volume":"129 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of air profiling and frother concentration on a flotation bank performance 空气剖面和浮选剂浓度对浮选槽性能的影响

Physicochemical Problems of Mineral Processing Pub Date : 2024-03-20 DOI: 10.37190/ppmp/186274

Miguel Maldonado, Ignacio Ramos, Alonso Pinto, Cesar O Gomez

引用次数: 0