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Effect of swelling clay dispersion type on fine coal flotation

Zhang Mingqing, Yu Wei, Cao Yijun, Xu Haiyu

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 2

380--388

The influence of bentonite dispersion on fine coal flotation was examined to better understand the role of swelling clay in the process of flotation. It was found that the coal flotation recovery was lower with uncontrolled dispersion of bentonite than with controlled dispersion. The detrimental effect was attributed to the increase in slime coating. In the uncontrolled dispersion, the dispersed bentonite platelets formed an extensive card-house structure. The three-dimensional networks increased the slurry viscosity, and caused significant coating of the coal particles, thereby inhibiting particle mobility and bubble-particle attachment. In the controlled dispersion, the bentonite mineral appeared as separate particles with low aspect ratios. The coal particles were partially coated, and the slurry viscosity was lower, resulting in higher flotation recovery. The findings in this study suggested that a practical solution to mitigate the negative impact of swelling clay on flotation would be to maintain high electrolyte levels in the wash water to inhibit clay swelling and dispersion.

Effect of Salt Stress on Rosa ‘New Dawn’ in in vitro Culture

Pawłowska B., Bach A.

Ecological Chemistry and Engineering. A

2010

Vol. 17, nr 9

1171-1178

Salt stress is one of the main causes of plant damage in horticulture and tree die back in cities. It can be of natural origin but most often is due to human activity, eg uncontrolled fertilization or the use excessive amounts of salt for winter maintenance of streets and pavements. Plants are selected for resistance to salt, and laboratory in vitro techniques proved very useful for this purpose. The present experiments aimed to determine tolerance of roses Rosa ‘New Dawn’ to salt. The effect of sodium and calcium chloride on plant growth and shoot development in ‘New Dawn’ rose in in vitro cultures was examined. The plants were cultured on the QL medium containing 5 ěM BA, 0.05 ěM NAA, 0.3 ěM GA3 and 20 g dm–3 sucrose, pH = 5.6, supplemented with NaCl or CaCl2 (at concentrations 0–400 mM). The media containing increasing concentrations of salts under study showed inhibitory effect on regeneration and multiplication of rose shoots. CaCl2 was less toxic than NaCl. An increase in medium salinity, independently of the salt tested, reduced the height of newly grown shoots and the number of leaves. Moreover, the proportion of chlorotic, deformed or necrotic leaves increased with the increasing salt concentration. The media did not affect shoot fresh mass index or fresh-to-dry mass ratio, which remained at the same level independently of chloride concentration in medium.

Stres solny jest jednym z głównych czynnikow powodujących uszkodzenia roślin w uprawach ogrodniczych, a także obumieranie drzew w miastach. Może być wynikiem naturalnych procesów, ale najczęściej zachodzi pod wpływem działalności człowieka, np. nieracjonalnego nawożenia lub używania zimą dużych ilości soli w celu usuwania oblodzenia drog i chodnikow. Przydatna w badaniu selekcyjnym reakcji roślin na zasolenie okazała sie technika laboratoryjna in vitro. W przeprowadzonych doświadczeniach określano tolerancje róż Rosa �eNew Dawn�f na zasolenie.