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Period verification device for ventilation rate standard rods based on a digital thermal flowmeter

Hu Jiacheng, Sha Ying, Cai Jinhui, Liu Ying, Liu Suijun

Metrology and Measurement Systems

2022

Vol. 29, nr 1

231--244

Ventilation rate is a physical index that is strictly controlled during cigarette manufacturing because an abnormal ventilation rate can affect the release of mainstream smoke, tar, and other components harmful to human health. Therefore, the standard rod is used for measuring the ventilation rate, which necessitates accurate and effective periodic inspections. In this study, we designed and built a set of special tobacco ventilation rate standard rods to assess the standard device during its verification period and used a digital thermal flowmeter as the flow standard.We determined the micro-pressure adjustment interval through fluid simulation, and conducted an experimental verification based on the simulation results. At the adjustment point where the differential pressure value was 0 Pa, the period verification device was tested under the standard values of 27.38%, 58.83%, and 71.95%. The results show that the measurement errors of the device are -0.42%, 0.55%, and -0.13% respectively, which all meet the verification regulation requirements and indicate that the device is applicable in practical situations.

Effects of Ca2+ and SO4 2- ions on fluorite flotation

Xun Luobing, Hu Jiacheng, Shi Qing, Zhang Guofan

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 2

95--104

The effects of Ca2+ and SO4 2- on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of SO4 2- and Ca2+ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of SO4 2- on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more SO4 2- are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.