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Produkcja tlenków ołowiu

Bednarek Piotr, Pakiet Jacek, Kulawik Sebastian

Rudy i Metale Nieżelazne Recykling

2020

R. 65, nr 1-2

20--25

Reduction of Lead Oxide by Fine-Grained Carbonaceous Materials

Matuła T., Siwiec G.

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 2

647--652

As part of the presented work, tests were carried out to check the possibility of replacing of conventional reducers used in the lead pyrometallurgical processes by cheaper, but equally effective substitutes. For research of lead oxide reduction, the following fine-grained carbonaceous materials were used, ie anthracite dust and coal flotation concentrate, as well as traditional used coke breeze for comparison. The obtained test results indicate a similar ability to reduce the lead oxide of all studied carbonaceous materials.

Efficient sulfidization of lead oxide at high temperature using pyrite as vulcanizing reagent

Zheng Y.-X., Lv J.-F., Wang H., Wen S.-M., Huang L.

Physicochemical Problems of Mineral Processing

2018

Vol. 54, iss. 2

270--277

A sulfidization roasting-flotation process was usually viewed to be effective in treating the refractory oxide ore. In this paper, pyrite was proposed to be applied as a potential vulcanizing reagent to transform PbO or its surface to PbS based on feasibilities of technology and economy. The evolution process, phase and characteristics of crystal growth were investigated by TG, XRD and SEM-EDS, respectively, to interpret the interaction mechanism of lead oxide and pyrite at high temperature. It was found that the decomposition process of pyrite under argon atmosphere was a slow process of sulfur released from FeS2 to FexS, which made the process easier to be controlled. When PbO was introduced into the system, the initial solid-solid (PbO-FeS2) reaction and prevailing solid-gas (PbO-S2(g)) reaction occurred at about 500 °C and 700 °C, respectively. Combined with the SEM-EDS analyses results, the optimal temperature for the sulfidization of PbO should be in the range of 700-750 °C.