Experimental study on recycling dredged marine sediment and phosphate tailing to produce earth fill

Li, Mingdong; Cong, Xin; Zhu, Liu; Kong, Lingpeng; Zhang, Zhifeng; An-guo, Tian; Li, Lei

doi:10.1080/1064119x.2016.1213340

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…The P 2 O 5 grade of phosphate ore in China is generally low, − with medium to low grade phosphate ore accounting for over 90%. − Phosphorus ore flotation tailings (POFTs), an industrial solid waste generated in the process of phosphate mining, contain a large number of Mg, Ca, and P resources. China produces nearly 10 million tons of POFTs per year. − However, the overall utilization rate of POFTs is only about 10% .…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Approaches for Phosphorus Ore Flotation Tailings Treatment and Disposal Technology: Environment Properties, Comprehensive Utilization, and Resource Utilization

Li,

Shu,

Zhao

et al. 2024

Ind. Eng. Chem. Res.

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Phosphorus ore flotation tailings (POFTs) are an industrial solid waste generated in the process of phosphate mining, which contains a large number of Mg, Ca, and P resources. The sources, storage, hazards, and resource environment properties of POFTs were summarized, and the present situation of POFTs treatment and disposal technology at home and abroad was analyzed in this review. The resource reduction technology of POFTs focuses on increasing the phosphate grade and optimizing the flotation process. The harmless treatment technology of POFTs mainly uses a neutralizing agent. In resources utilization technology, POFTs have been widely used in agriculture and industry fields, especially in fertilizers, soil remediation, building materials, roadbed materials, environmental functional materials, and filling materials. In order to develop POFTs reduction, reuse, and resource recycling technology, the treatment and disposal of POFTs should adhere to the concept of circular economy. This review is informative for solving the problems of POFTs accumulation and environmental pollution.

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Section: Introductionmentioning

confidence: 99%

A Critical Review on Approaches for Phosphorus Ore Flotation Tailings Treatment and Disposal Technology: Environment Properties, Comprehensive Utilization, and Resource Utilization

Li,

Shu,

Zhao

et al. 2024

Ind. Eng. Chem. Res.

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“…Using dredge material to produce earth fill has been proposed with some degree of success [3,5], however, another more value-adding possibility is to use dredge material 2 of 11 to develop compressed stabilized earth bricks (CSEB). CSEB are easy to manufacture and are relatively uncomplicated to produce in bulk.…”

Section: Introductionmentioning

confidence: 99%

Development of Fiber Reinforced Sustainable Dredge Bricks

et al. 2023

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To maintain adequate depth of commercial waterways, large quantities of earthen material are dredged and stored on undeveloped placement areas adjacent to the waterway. As dredge placement areas become overwhelmed, an environmental and financial sustainable solution for the reuse of dredged soil is prioritized. In this study, locally dredged material from the Sabine-Neches Waterway was used to explore the potential of dredged material in the production of compressed stabilized earth bricks (CSEBs) for small-scale structures in the region. CSEB mixture designs were developed containing fly ash (FA), Portland cement (PC), hydrated lime (HL), water (W), dredged material (DM), and natural and synthetic fibers. Optimized mixtures designs reached the recommended compressive strength of over 1200 psi. Results showed that that the addition of fibers reduced the compressive and flexural strength of the bricks, with a maximum compressive strength of 1394 psi with a corresponding flexural strength of 381 psi being obtained with fiberless dredge bricks. Multiple coating systems were also tested to increase the resistance of the bricks to weathering and erosion. Results showed that the use of coatings reduced water absorption and increased the bricks resistance to erosion, making them more adept in regions commonly subjected to flooding and heavy wind-driven rains.

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“…However, the grade of phosphate ore is relatively low in China, with an average grade of 16.85% (P2O5). Phosphate ore resources with ω (quality percentage) (P2O5) ≥ 30% account for only 12%, and most of the rest are low-grade refractory ores, which can only be used economically after treated with mineral processing technologies (Li et al, 2016;Loutou et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The effect of various surfactants on fatty acid for apatite flotation and their adsorption mechanism

Liu¹,

Han²,

Zhao³

2021

Physicochem. Probl. Miner. Process.

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The synergistic effect of surfactants, i.e., Tween-80 (polyethylene glycol sorbitan monooleate), Span-80 (sorbitanoleate), and MES (fatty acid methyl ester sulfonates), on fatty acid collectors were investigated using single mineral flotation experiments, surface tension measurement, Fourier transform infrared spectrum, and contact angle measurements. The single mineral flotation experiments showed that it was possible to efficiently separate apatite from magnetite, quartz, and biotite by mixing fatty acids with surfactants. The surface tension measurement showed that the surfactants could significantly reduce the surface tension and Critical Micelle Concentration (CMC) of fatty acids. Fourier transform infrared spectroscopy analysis indicated that all of the surfactants did not react with the fatty acids, but only physically adsorbed on the surface of apatite, thus promoting the chemical adsorption of fatty acids on apatite. However, the surfactant chemisorbed on magnetite and competing with a fatty acid, which led to a decrease in the flotation recovery. The results for contact angle measurement showed that the contact angle difference between apatite and magnetite increased with the addition of surfactant, and resulted in an efficient separation.

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Experimental study on recycling dredged marine sediment and phosphate tailing to produce earth fill

Cited by 10 publications

References 14 publications

A Critical Review on Approaches for Phosphorus Ore Flotation Tailings Treatment and Disposal Technology: Environment Properties, Comprehensive Utilization, and Resource Utilization

A Critical Review on Approaches for Phosphorus Ore Flotation Tailings Treatment and Disposal Technology: Environment Properties, Comprehensive Utilization, and Resource Utilization

Development of Fiber Reinforced Sustainable Dredge Bricks

The effect of various surfactants on fatty acid for apatite flotation and their adsorption mechanism

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