Zero-Waste Recycling Method for Nickel Leaching Residue by Direct Reduction–Magnetic Separation Process and Ceramsite Preparation

2019 ◽  
Vol 72 (4) ◽  
pp. 1075-1085 ◽  
Author(s):  
Qiang Zhao ◽  
Jilai Xue ◽  
Wen Chen
Keyword(s):  
Magnetic Separation ◽  
Direct Reduction ◽  
Waste Recycling ◽  
Separation Process ◽  
Zero Waste ◽  
Leaching Residue ◽  
Nickel Leaching

scholarly journals Iron Recovery from Discarded Copper Slag in a RHF Direct Reduction and Subsequent Grinding/Magnetic Separation Process

Minerals ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 119 ◽  
Author(s):  
Zhicheng Cao ◽  
Tichang Sun ◽  
Xun Xue ◽  
Zhanhua Liu
Keyword(s):  
Magnetic Separation ◽  
Direct Reduction ◽  
Copper Slag ◽  
Separation Process ◽  
Iron Recovery

Quality Improvement of Recycled Aggregates from a Construction and Demolition Waste Recycling Pilot Plant

2012 ◽  
Vol 730-732 ◽  
pp. 630-635
Author(s):  
D. Algarvio ◽  
Maria Margarida Rolim Augusto Lima ◽  
M.L. Cunha
Keyword(s):  
Quality Improvement ◽  
Magnetic Separation ◽  
Pilot Plant ◽  
Waste Recycling ◽  
Separation Process ◽  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Demolition Waste ◽  
Size Fractions ◽  
Cumulative Curves

The construction and demolition wastes (C&DW) frequently are abandoned in private properties, roads, and landfills or collected by non-licensed companies. In Portugal they are few recycling plants operating with this residue, and this work makes the bridge between the mechanical recycling process developed on semi-industrial scale, and the recycling products characterization process developed on laboratorial scale. The main goal of the present work is the quality improvement of the recycled aggregates produced by a construction and demolition waste recycling pilot plant with 50 ton/h located in Montemor-o-Novo. Process operations are the hammer mill comminution, magnetic separation and sieving (bar sieves: 0-4mm, 4-8mm and 8-12mm; and square sieves: 12-22mm, 22-31mm and above 31mm). In order to improve the magnetic separation process, several tests with different distances between the magnet and the conveyor belt were made (21-31cm). On the other hand, to improve the quality of the produced aggregates, the bar screen size fractions were analyzed, according to the Portuguese Standard (NP EN 933-1 2000). The most efficient distances for the magnetic separation process were identified as between 21 and 27cm, with efficiency between 85% and 90% respectively. According to the histograms, the more frequent red aggregate from 0-4mm size fraction are +0.425-0.850; +0.850-1.7 and +1.7-3.35. From the 4-8mm red aggregates, the more frequent size fractions are +4.75-6.7 and +6.7-9.95. Finally, from the 8-12mm red aggregates, the more frequent new size fractions are +6.7-9.50 and +9.50-13.20. Sieving results obtained from cumulative curves for red aggregate showed an decrease in the mass % amount for the size fractions: 0-4mm: 97%, 4-8mm:76% and 8-12mm: 56%. The results from cumulative curves for grey aggregate showed a light decreased in the amount mass % for the size fractions: 0-4mm: 90%, 4-8mm:56% and 8-12mm: 60%.

Study on the Magnetic Separation Experiment of Vanadium and Titanium Iron Concentrate Pellets

2012 ◽  
Vol 549 ◽  
pp. 969-974
Author(s):  
Lan Ma ◽  
Shao Li Yang ◽  
Ya Ling Li
Keyword(s):  
Magnetic Separation ◽  
Process Parameters ◽  
Direct Reduction ◽  
Reduction Process ◽  
Separation Process ◽  
Raw Material ◽  
Iron Concentrate ◽  
Metallized Pellets ◽  
The Impact ◽  
Alloy Iron

Based on Vanadium and Titanium iron concentrate pellets as raw material produced by direct reduction process of coal rotary hearth furnace in an enterprise, the paper studies the impact of magnetic separation process parameters on magnetic separation effect. The results shows that: the use of magnetic separation process can successfully separate metallized pellets, and obtain vanadium titanium micro-alloy iron powder and ti-enriched slag; suitable magnetic separation process parameters are: excitation current of 4A (magnetic field strength 2250Oe), particle size -200 mesh (-74μm), mine concentration of 1:3, iron recovery 92.5% TiO2 recovery up to 55.5%.

The recyclable waste recycling potential towards zero waste cities - A comparison of three cities in China

2021 ◽  
Vol 295 ◽  
pp. 126358
Author(s):  
Binxian Gu ◽  
Xinyi Tang ◽  
Lingxuan Liu ◽  
Yuanyuan Li ◽  
Takeshi Fujiwara ◽  
...  
Keyword(s):  
Waste Recycling ◽  
Zero Waste ◽  
Recycling Potential

scholarly journals Recovery of γ-Fe2O3 from copper ore tailings by magnetization roasting and magnetic separation

2021 ◽  
Vol 19 (1) ◽  
pp. 128-137
Author(s):  
Bing Luo ◽  
Tongjiang Peng ◽  
Hongjuan Sun
Keyword(s):  
Magnetic Separation ◽  
Magnetic Field Intensity ◽  
Sodium Dodecyl ◽  
Separation Process ◽  
Sodium Dodecyl Sulfonate ◽  
Copper Ore ◽  
Yield Rate ◽  
Optimum Parameters ◽  
Roasting Temperature ◽  
Mineralogical Phase

Abstract To comprehensively reuse copper ore tailings, the recovery of γ-Fe2O3 from magnetic roasted slag after sulfur release from copper ore tailings followed by magnetic separation is performed. In this work, after analysis of chemical composition and mineralogical phase composition, the effects of parameters in both magnetization roasting and magnetic separation process with respect to roasting temperature, residence time, airflow, particle size distribution, magnetic field intensity, and the ratio of sodium dodecyl sulfonate to roasted slag were investigated. Under optimum parameters, a great number of γ-Fe2O3 is recycled with a grade of 66.86% and a yield rate of 67.21%. Meanwhile, the microstructure, phase transformation and magnetic property of copper ore tailings, roasted slag, and magnetic concentrate are carried out.

Sign in / Sign up

Export Citation Format

Share Document