The iron ore tailings (IOT) used in this work were collected from four Class III high environmental risk iron ore tailings-dams [26]. These (Fig. A.1) were selected based on the associated social and environmental potential risks, as well as economic relevance, as described in the dams inventory of the Minas Gerais State [27]. All four …
Mine tailings are the waste material that remains after the economic fraction has been extracted from the mineral ore. Tailings consist of a slurry of ground rock, and water and chemical reagents that remain after processing. The composition of mine tailings varies according to the mineralogy of the ore deposit and how the ore is processed.
Iron ore tailings (IOT) are discharged as waste after the beneficiation process to concentrate iron ore, which has triggered a series of environmental problems. ... The LOI (loss on ignition) means the percentage of the lost mass in the original sample after drying the raw materials which lose external moisture in the temperature range of …
Yu Chen, Xiaodong Pan, Yongping Xie & Suqin Li. 55 Accesses. Explore all metrics. Abstract. Iron ore tailings (IOTs) are an important solid waste in the mining …
China's iron ore consumption accounts for 60% of the global total. According to the Annual Report on the Prevention and Control of Environmental Pollution by Solid Wastes in Large and Medium-sized Cities in 2020 [1], the output of Iron ore tailings (IOT) is 440 million tons, while the comprehensive utilization rate is only 23.4%. Huge …
by Sarah Sax on 21 February 2024. In 2019, the collapse of an iron-ore tailings dam in Brumadinho, southeastern Brazil, killed 272 people, flattened entire villages, and caused widespread ...
With a rise in tailings content, the compacting factor declines. This may be due to iron ore tailings' fineness, which allows the particles to fill more voids in new concrete and produce a heavier compacted mass . However, it should be emphasized that all of the mixtures have high compatibility, with compacting factors ranging from 0.8 to 0.92.
Introduction. Billions of tons of mine tailings are generated annually from extracting and processing of metal and mineral ores, 1, 2, 3 stockpiled in about 4,800 mine tailings storage facilities (TSFs), 4 occupying >240,000 ha of land worldwide. 4 Iron (Fe) ore tailings are one of the most challenging global tailings liability, 5 with over 1.4 …
Figure 1 (a-d) illustrates the iron ore waste and cementitious precursor materials under study. Iron ore tailings (IOTs) were obtained from the Ferric Quadrangle located in the province of Minas Gerais, Brazil. IOTs are classified as SM according to the Unified Soil Classification System (USCS) [34].The main physical properties and grain …
Iron ore tailings are a byproduct of the mining and processing of iron ore, and their potential use as a replacement resource is the emphasis of this study. ... IOT, sodium silicate, and sodium hydroxide solutions was tested for fresh properties, strength, mass loss, and microstructure evolution with varying percentages of IOT replacement (0 ...
After 3 years of the Mariana tragedy, on 25th January 2019, another mining dam consisting of iron ore tailings failed catastrophically in the Brumadinho city, Minas Gerais State, Brazil. The rupture produced more than 11 × 10 6 m 3 of mining waste – equivalent to a 10-m high wave of mud that spread 10 km the downhill – that reached the ...
On September 5, 2008, a tremendous iron-ore mine tailings dam break accident occurred in Shanxi Province, China, causing 277 deaths and $14.59 million in economic losses [7, 8]. On January 25, 2019, 235 people were killed and 35 people went missing (data from the Minas Gerais Fire Department, May 4, 2019) after an iron-ore …
Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs …
The need for low-cost raw materials is driven by the fact that iron ore tailings, a prevalent kind of hazardous solid waste, have created major environmental issues. Although many studies have focused on using iron ore tailing (IOT) in concrete and have reported positive results, readers may find it difficult to accurately assess the …
Guangyan Tian, Lijuan Wang & Jinsheng Liang. 890 Accesses. 8 Citations. Explore all metrics. Abstract. Iron ore tailing is a major solid waste requiring advanced recycling …
1. Introduction. Iron ore is one of the most common resource widely used in industry while the tailings discarded during the beneficiation and smelting process of iron ore become an important hazardous waste worldwide [1], [2].In China and Brazil, more than 10 billion tons of iron ore tailings have been discharged as waste and normally deposit …
Iron ore tailing is currently one of the most important secondary mineral resources. Pre-concentration followed by magnetization roasting and magnetic …
The dumping of IOT may result in loss of vegetation, pollution of topsoil, creating overburden load, deforestation, soil erosion, water and air pollution and other hazards to human population. ... H. R. Arjun and George Ignatius, "Utilization of Iron Ore Tailings for the Production of Fly Ash | GGBS-Based Geopolymer Bricks" Journal of ...
This study aimed at the investigation of the effect of colloidal magnetic particles on the magnetic separation of iron ore tailings (IOT). For this, the synthesis and characterization of bare iron, iron-dextran, and iron-oleate magnetic particles is reported. ... but with a loss in grade of about 5%. Further cleaning stages are necessary to ...
The results also showed that the mass loss of 40% iron ore tailings was lowest and further illustrated that its frost resistance was the best. 3.2. Analysis of Compressive Strength Loss. Compressive strength loss of concrete with different iron ore tailings replacement rates after freezing-thawing cycles is shown in Table 6 and Figure 4.
Iron Ore Tailings Pile and collection for research. By the literature studied, the active agent adopted was 85% commercial phosphoric acid [32], [46], [71], [73], with a molar mass of 98 g/mol, a density of 1.685 g/ml, and a molar concentration of 14.6148 mol/L. Deionized water was adopted for acid dilution [32] .
Iron ore tailings (IOTs) are the industrious solid waste discharged by concentrating mills after processing iron ores and selecting "valuable …
Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs was studied at different points during a process involving pre-concentration followed by direct reduction and magnetic separation. Then, slag-tailing concrete composite admixtures …
A typical thermogram of the iron ore tailings sample is shown in Fig. 5 (4.76–2.38 mm). There is a thin peak at 50 °C ascribed to the water loss in kaolinite and the peaks at 100–130 °C are ascribed to the loss of water physically adsorbed on …
This detailed mineralogical insight is essential for explaining the observed variations in iron content within the tailings which are directly linked to the mineral composition of processed iron ore. In recent decades, as high-grade iron ores become …
Introduction: In our study, various test methods were adopted to explore the mineralogical characteristics, grindability, particle morphology, particle size distribution, and environmental leaching …
The admixture iron ore tailings were produced in Jiangjiagou tailings pond in Luonan, Shangluo City, Shaanxi Province, China. Its fineness modulus was 1.58, porosity was 43.2%, bulk density …
Standard sands (SS) and iron ore tailings sands (IOT) were used as the fine aggregates. The SS was produced by Xiamen ISO Standard Sand Co., Ltd. and the main quality indexes are listed in Table 2.It shows that the content of SiO 2 exceeds 98 % for the SS. The SS was dried by a drying oven (Subo, 101-00SB) at 105 °C for 24 h until …
A pilot-scale experiment on iron recovery from iron ore tailings using pre-concentration and then SMR followed by magnetic separation and flotation was …
On 25 th January 2019, a tailings dam at the Córrego do Feijão iron ore mine, in the Brumadinho city, Brazil, failed suddenly, killing 270 people and seriously …
1. Introduction. Iron ore tailings (IOTs) are solid wastes after beneficiation [1], accounting for nearly 1/3 of the total tailings [2].It is reported that the recycling utilization rate of IOTs is only 7% [3].A large amount of IOTs are stored in tailings dams, which increases the cost of land occupation and leads to environmental degradation …
Utilizing iron ore mining wastes like dump fines, slimes, and tailings, which contain significant iron values, is essential to meet future needs and environmental …
For example, the content of SiO 2 in phosphate tailings is 2.1, in contrast to the 75.23 in iron ore tailings. Even if there were all lead-zinc tailings or iron ore tailings, the variation content of SiO 2 is 15.50-69.92 in the lead-zinc tailings or 24.19-75.23 in the iron ore tailings. As a result, if tailings are only classified according to ...
High‑silicon iron ore tailings (IOTs) as mineral solid wastes derived from the processing and utilization of iron ore, which would threaten human health and the ecological environment if handled improperly. ... Notably, the HF reacted with SiO 2 generating SiF 4, which caused the SiO 2 loss. Consequently, an appropriate amount of …
Globally, mining operators focus increasingly on tailings filtration to recover process water and store tailings more safely. Generally, required water contents below 20-w% are reached by using filter presses. To maintain high efficiency, complete cake detachment is needed because incomplete discharge reduces plant performance. …
Iron ore tailings (IOTs) are an inevitable by-product produced during the beneficiation process of iron ore (Almeida et al., 2023). The rapid growth of mineral mining and ferrous metallurgy has led to an increase in the generation of IOTs. ... The weight loss in the temperature range of 521.87–742.43 °C (2.12%) with an endothermic peak at ...
Abstract. Today many types of tailings are generated in the mining operations. Particularly, in the iron ore industry, although 99% of the generated tailings are composed by non-toxic elements, it ...
The iron ore in China is characterized as "poor, fine and complicated," with the limitation of beneficiation technology leading to the loss of some iron minerals in the …
Iron Ore Tailings (IOT) are the waste slag resulted from iron ore mines. Large amount of Iron Ore Tailings (IOT) have been generating every year posing serious environmental problems, large production of cement everyday resulting the emission of CO 2 and increase in the consumption of river sand for construction activities making the river beds ...
Iron ore tailings (IOT) are materials that may contain clay minerals. ... The largest mass loss gradients observed in the unground IOT sample without heat treatment were 5.5% and 1.0% at temperatures of approximately 500 °C and 750 °C, respectively. Thus, temperatures of 500 °C and 750 °C were used for the thermal treatment, which …