scholarly journals Comparative Study of MnO2 Dissolution from Black Copper Minerals and Manganese Nodules in an Acid Medium

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 817
Author(s):  
Carlos Moraga ◽  
Eduardo Cerecedo-Saenz ◽  
Javier González ◽  
Pedro Robles ◽  
Francisco Raul Carrillo-Pedroza ◽  
...  

The low grade of copper deposits and the use of the froth flotation process have caused excessive tailing production. In recent years, experts have looked for new alternative methods to improve this situation. Black copper minerals are abundant resources not exploited by large-scale copper mining and possess high Mn concentrations. On the other hand, manganese nodules are submarine resources and show high concentrations of Cu, Ni, Fe, and, mainly, Mn. However, both mineral resources are refractory to conventional leaching processes, and so a reducing agent is necessary for their treatment. We studied the use of tailings obtained from the flotation of foundry slags with a high content of Fe3O4 as reducing agents at different MnO2/tailings ratios and H2SO4 concentrations. Mn dissolution was compared in marine nodule and black copper minerals samples. It was found that higher Mn dissolutions are obtained from marine nodules, likely due to the acid consumption created by Cu dissolution from black copper minerals. The remnant elements in manganese nodules were leached under an oxidant condition.

2012 ◽  
Vol 616-618 ◽  
pp. 643-648
Author(s):  
Yong Cheng Zhou ◽  
Xiong Tong ◽  
Xiao Wang ◽  
Zheng Bin Deng ◽  
Xian Xie ◽  
...  

With the continuous depletion of primary tin ores, tin tailings has become an important source for the production of tin; however, the large-scale utilization of tin tailings is disappointedly scarce, due to its leanness in valuable minerals and insufficient methods available for processing such low-grade tailings. A flotation process has been used on a laboratory scale to investigate the effects of various reagents such as salicylhydroxamic acid, lead nitrate, sodium hexametaphosphate and pine oil on tin recovery at neutral pulp. Because cassiterite is friable and a large amount of fines and slimes were generated, usually de-sliming is used to prevent slime coating and to increase the recovery of tin. However, analyses have shown that fine particles in the sample mostly contain tin, thus de-sliming was not suggested. By applying the process, ultrafine cassiterite could be efficiently recovered from the slime tailings, and the concentrate assaying 1.82% Sn with a recovery of 76.90% was obtained.


2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Priyanka Dhar ◽  
Maria Thornhill ◽  
Hanumantha Rao Kota

Abstract In general, precipitated calcium carbonate (PCC) is used as a mineral filler in paper industries; while natural calcite (CaCO3) ore is also suitable for industrial use if it is a finely ground high-grade material. Naturally, calcite is found in the form of high- or low-grade ores and it is one of the most widely distributed industrial minerals on the earth’s crust. However, it is rarely found in its pure form and is generally associated with other gangue minerals; the type and percentage of which vary from one deposit to another. These minerals are generally separated by flotation and/or magnetic separation (in the case of iron impurities). Calcite ores typically contain metal sulphide, silicate, or other calcium-containing impurity minerals, which can be removed by flotation. A tremendous amount of research has been performed on refining the flotation process for calcite ores and designing the reagents (specifically, collectors) to increase the efficiency of the process. Metal sulphide/silicate impurity minerals can be removed by the froth-flotation process using amines and xanthate collectors. Alternatively, fatty acids are used as collectors to float calcium-type minerals directly from the ore. This paper reviews the industrial practices and fundamental research related to collectors surrounding calcite ore flotation. This article presents and reviews collectors for the beneficiation of high-grade calcite ores which have been reported in the literature in order to assist judicial choice of collecting agents in flotation.


Author(s):  
Zagarzusem Ts ◽  
Sugir-Erdene N ◽  
Orgilbayar B ◽  
Sukhbat S ◽  
Soyolmaa Ts ◽  
...  

This study demonstrated the importance of appropriate flotation conditions and reagent dosage for the separation of standard manganese concentrates from low-grade manganese ores. The research object used Unagad manganese ore located in Dornogovi province. The main mineral of manganese ores was pyrolusite (MnO2). According to the chemical element analyses, the content of manganese in the primary ore was Mn-17.31%. XRD analyses revealed minerals such as quartz, pyrolusite, albite, anorthite, anorthoclase, orthoclase, and hausmannite. This study conducted the beneficiation of manganese ore by the froth flotation method. Manganese ore beneficiation tests were performed for the flotation method under the following conditions: the collector dosage with 900 g/t, 1100 g/t, 1300 g/t, 1500 g/t, and 1700 g/t, the dosage of the depressant as 570 g/t, 670 g/t, 770 g/t, and 870 g/t, and the frother with 900 g/t, pH value 8, the grade of -0.074 mm was 60%, 70%, 80%, 90% respectively. Beneficiation tests performed in the optimum conditions resulted in concentrate with Mn = 32.37%, the recovery was 57.33%, and the yield was 30%. As a result of the flotation enrichment of manganese ore, а concentrate containing 32.37% manganese was obtained. Манганы хүдрийг флотацийн аргаар баяжуулах технологийн судалгаа Хураангуй: Энэхүү судалгаагаар бага агуулгатай манганы хүдрээс стандартын шаардлага хангасан манганы баяжмалыг гарган авахад флотацийн зохистой горим, урвалжийн зарцуулалт хэрхэн нөлөөлж байгааг тогтоов. Судалгааны объектоор Дорноговь аймгийн нутагт орших Унагадын манганы ордын хүдрийг ашигласан бөгөөд хүдрийн голлох эрдэс нь пиролюзит юм. Элементүүдийн химийн шинжилгээгээр анхдагч хүдэр дэх манганы агуулга 17.31% байна. Рентген дифрактометрийн шинжилгээгээр кварц, пиролюзит, альбит, анортит, анортоклаз, ортоклаз, гаусманит зэрэг эрдсүүд байгаа нь тогтоогдсон. Манганы хүдрийг флотацийн аргаар баяжуулах цуврал туршилтуудыг цуглуулагчийн зарцуулалт 900 г/т, 1100 г/т, 1300 г/т, 1500 г/т, 1700 г/т, дарагчийн зарцуулалт 570 г/т, 670 г/т, 770 г/т, 870 г/т, хөөсрүүлэгч 900 г/т, рН-8, ширхэглэлийн хэмжээг -0.074 мм ангийн агуулга 60%, 70%, 80%, 90% гэсэн нөхцлүүдэд явуулсан. Туршилтын дүнд цуглуулагчийн хэмжээ 1500 г/т, хөөсрүүлэгч 900 г/т, дарагч 670 г/т, -0.074 мм ангийн агуулга 70%, рН-ийн утга 8 гэсэн хамгийн тохиромжит нөхцөлд баяжмал дахь металл авалт 57.33%, гарц 30% байж, харин Mn-ний агуулга 32.37%-тай баяжмал гарав. Түлхүүр үг: Манганы баяжмал, флотаци, олейны хүчил, натрийн силикат


Author(s):  
Muhammad Arif Bhatti ◽  
Kamran Raza Kazmi ◽  
Abdul Ahad ◽  
Anila Tabassum ◽  
Rashid Mehmood ◽  
...  

A bench-scale beneficiation study was performed on low-grade complex lead-zinc ore of Duddar area, District Lasbela, Balochistan Province, Pakistan. The polymetallic ore under investigation contains galena and sphalerite as valuable minerals of lead and zinc. The low-grade ore was upgraded by selective sequential froth flotation technology to recover both minerals. An effort was made to investigate the effect of important variables on grade and recovery of concentrates and to design the process flow sheet. Different parameters of flotation process such as particle size of the feed, pH and % solids of the pulp, speed of impeller, type of reagents (collectors, frothers, regulators and modifiers) and their quantities, conditioning time and flotation time were optimized to attain maximum grade and recovery of respective concentrates. The rougher concentrates obtained were subjected to one regrinding and two cleaning operations to achieve higher-grade concentrates of both metals. Bench-scale flotation tests show that it is possible to obtain a lead concentrate assaying 65.24% Pb with recovery rate of 81.32% and a zinc concentrate containing 55.63% Zn content with recovery rate of 80.28%. Both the concentrates meet the specifications required for metallurgical and chemical grades.


2020 ◽  
Vol 42 (1) ◽  
pp. 1-1
Author(s):  
Muhammad Arif Bhatti Muhammad Arif Bhatti ◽  
Kamran Raza Kazmi Kamran Raza Kazmi ◽  
Samreen Zahra Samreen Zahra ◽  
Ansar Mehmood and Rashid Mehmood Ansar Mehmood and Rashid Mehmood

A low-grade graphite ore originating from Kael area, Shounter Valley, Azad Kashmir, assaying 8.90% graphite content was upgraded by froth flotation technique to produce a commercial grade graphite concentrate. Mineral phases present in the ore were identified by using X-ray diffraction (XRD) technique. The variables of flotation process such as particle size of the feed, pH of the pulp, % solids of the pulp, speed of impeller, type and quantity of collecting and frothing agents, conditioning time and froth collecting time were optimized to get maximum grade and recovery of graphite mineral. The pH of the pulp was adjusted with sodium carbonate. Kerosene oil was used as collector while pine oil as frother respectively. Sodium silicate was employed as depressant. The grade of the final graphite concentrate produced was 85.80% C with overall recovery of 86.00%. Its surface morphology was studied using SEM-EDX technique while grain size by laser particle size analyzer.


2013 ◽  
Vol 807-809 ◽  
pp. 2309-2316
Author(s):  
Ci Yun Chen ◽  
Shu Ming Wen ◽  
Qi Cheng Feng ◽  
He Fei Zhao

It is difficult to handle platinum-palladium ores in Jinbaoshan due to low grade ores, kinds of mineral resources, complex mineral structure, fine-grained dissemination, which is a typical refractory complex ores. Based on the research of lots of correlative literature, this article analyses refractory reasons of platinum-palladium ores in Jinbaoshan, and provides an overview of comprehensive utilization status of low grade and refractory platinum-palladium ores on behalf of single flotation process, stage grinding-stage sorting and the combined process of flotation and magnetic separation, microwave pretreatment-leaching-replacement process, and the activation of acid leaching-extracting magnesium and iron-leaching residue to flotation process and so on.


2019 ◽  
Vol 22 (5) ◽  
pp. 346-354
Author(s):  
Yan A. Ivanenkov ◽  
Renat S. Yamidanov ◽  
Ilya A. Osterman ◽  
Petr V. Sergiev ◽  
Vladimir A. Aladinskiy ◽  
...  

Aim and Objective: Antibiotic resistance is a serious constraint to the development of new effective antibacterials. Therefore, the discovery of the new antibacterials remains one of the main challenges in modern medicinal chemistry. This study was undertaken to identify novel molecules with antibacterial activity. Materials and Methods: Using our unique double-reporter system, in-house large-scale HTS campaign was conducted for the identification of antibacterial potency of small-molecule compounds. The construction allows us to visually assess the underlying mechanism of action. After the initial HTS and rescreen procedure, luciferase assay, C14-test, determination of MIC value and PrestoBlue test were carried out. Results: HTS rounds and rescreen campaign have revealed the antibacterial activity of a series of Nsubstituted triazolo-azetidines and their isosteric derivatives that has not been reported previously. Primary hit-molecule demonstrated a MIC value of 12.5 µg/mL against E. coli Δ tolC with signs of translation blockage and no SOS-response. Translation inhibition (26%, luciferase assay) was achieved at high concentrations up to 160 µg/mL, while no activity was found using C14-test. The compound did not demonstrate cytotoxicity in the PrestoBlue assay against a panel of eukaryotic cells. Within a series of direct structural analogues bearing the same or bioisosteric scaffold, compound 2 was found to have an improved antibacterial potency (MIC=6.25 µg/mL) close to Erythromycin (MIC=2.5-5 µg/mL) against the same strain. In contrast to the parent hit, this compound was more active and selective, and provided a robust IP position. Conclusion: N-substituted triazolo-azetidine scaffold may be used as a versatile starting point for the development of novel active and selective antibacterial compounds.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abdolrahim Foroutan ◽  
Majid Abbas Zadeh Haji Abadi ◽  
Yaser Kianinia ◽  
Mahdi Ghadiri

AbstractCollector type and pulp pH play an important role in the lead–zinc ore flotation process. In the current study, the effect of pulp pH and the collector type parameters on the galena and sphalerite flotation from a complex lead–zinc–iron ore was investigated. The ethyl xanthate and Aero 3418 collectors were used for lead flotation and Aero 3477 and amyl xanthate for zinc flotation. It was found that maximum lead grade could be achieved by using Aero 3418 as collector at pH 8. Also, iron and zinc recoveries and grades were increased in the lead concentrate at lower pH which caused zinc recovery reduction in the zinc concentrate and decrease the lead grade concentrate. Furthermore, the results showed that the maximum zinc grade and recovery of 42.9% and 76.7% were achieved at pH 6 in the presence of Aero 3477 as collector. For both collectors at pH 5, Zinc recovery was increased around 2–3%; however, the iron recovery was also increased at this pH which reduced the zinc concentrate quality. Finally, pH 8 and pH 6 were selected as optimum pH values for lead and zinc flotation circuits, respectively.


2021 ◽  
Author(s):  
Jialiang Zhang ◽  
Guoqiang Liang ◽  
Cheng Yang ◽  
Juntao Hu ◽  
Yongqiang Chen ◽  
...  

Inspired by the process of "metallurgy first and then beneficiation" for disposing low-grade and complex mineral resources, we proposed a breakthrough method to recover valuable metals from spent entire lithium-ion...


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