Transformation and Detoxification of Typical Metallurgical Hazardous Waste into a Resource: A Review of the Development of Harmless Treatment and Utilization in China.

The production process of the metallurgical industry generates a significant quantity of hazardous waste. At present, the common disposal method for metallurgical hazardous waste is landfilling, which synchronously leads to the leaching of toxic elements and the loss of valuable metals. This paper presents a comprehensive review of the research progress in the harmless treatment and resource utilization of stainless steel dust/sludge (including stainless steel dust and stainless steel pickling sludge) and aluminum ash (including primary aluminum ash and secondary aluminum dross), which serve as representative hazardous wastes in ferrous metallurgy and nonferrous metallurgy, respectively.

A novel green deep eutectic solvent for one-step selective separation of valuable metals from spent lithium batteries: Bifunctional effect and mechanism.

This study used a novel green bifunctional deep eutectic solvent (DES) containing ethylene glycol (EG) and tartaric acid (TA) for the efficient and selective recovery of cathode active materials (LiCoO and LiNiCoMnO) used in lithium-ion batteries through one-step in-situ separation of Li and Co/Ni/Mn. The effects of leaching parameters on the recovery of Li and Co (η and η) from LiCoO are discussed, and the optimal reaction conditions are verified, for the first time, using a response surface method. The results demonstrate that under optimal conditions (120 °C, 12 h, EG to TA mole ratio (M) of 5:1, and solid to liquid ratio (R) of 20 g/L), the η from LiCoO reached 98.

A clean approach for detoxification of industrial chromium-bearing stainless steel slag: Selective crystallization control and binary basicity effect.

The complete detoxification and resource utilization of stainless steel slag are still facing challenges. In this paper, the harmless treatment of industrial stainless steel slag was realized by using a high temperature modification-crystallization control approach, and the influence of binary basicity (B) on selective enrichment of Cr-containing spinel in the slag and corresponding detoxification effect were systematically explored. Results demonstrated that the enrichment degree of Cr and the amount of Cr-bearing spinel separately reached 98.

Facile and large-scale fabrication of (Mg,Ni)(Fe,Al)O heterogeneous photo-Fenton-like catalyst from saprolite laterite ore for effective removal of organic contaminants.

A facile and cost effective acid leaching-coprecipitation method was developed to prepare spinel-type (Mg,Ni)(Fe,Al)O from saprolite laterite ore in large scale. The as-prepared (Mg,Ni)(Fe,Al)O exhibited excellent photo-Fenton-like catalytic activity in decomposing different kinds of organic dyes and antibiotic tetracycline in the present of oxalic acid (HCO). The influential factors of RhB degradation efficiency were investigated, including the (Mg,Ni)(Fe,Al)O dosage, HCO concentration and the intensity of simulated sunlight.

Efficient Nanorod Array Perovskite Solar Cells: A Suitable Structure for High Strontium Substitution in Nature.

Organic-inorganic hybrid perovskite solar cells (PSCs) have become a research hotspot because of their excellent power conversion efficiency (PCE), but the presence of toxic lead (Pb) in perovskite films has significantly limited their commercial applications. In this study, using a TiO nanorod array (TNRA) as the electron transport layer, strontium chloride (SrCl) was chosen to fabricate lead-less PSCs in air (relative humidity, RH = 50%) by a simple two-step spin-coating method. The influence of introduced strontium (Sr) on the perovskite films and cell properties was systematically investigated by various characterization methods.