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Author: Admin | 2025-04-28
Was not irritating to the skin of mammals according to the classification of skin stimulation intensity. (3)Heavy metal element testWe aimed to study whether the non-disturbance zone bonded dust suppressant developed in this paper contains heavy metal elements such as As, Cd, Cr, Hg, Pb, etc., which are potentially harmful to the human body and ecological environment. In this experiment, the JC-YZYG-300 atomic fluorescence photometer produced by Qingdao Jingcheng Instrument and Meter Co., Ltd. (Qingdao, China) was used under the condition of temperature of 18 °C and humidity of 48%, and the heavy metal content of the bonded dust suppressant in the non-disturbance zone was monitored by iCAP Qc inductively coupled plasma mass spectrometer produced by Thermo Fisher Scientific in the United States under the condition of temperature of 20 °C and humidity of 42%, and the test results are as follows.It can be seen from Table 5 that the content of toxic elements is below the standard value, and it can be considered that the dust suppressant has no harm to the ecological environment and the human body. Li et al. [34] comprehensively considered the performance, environmental safety, and cost-effectiveness of chemical dust suppressants and constructed a comprehensive evaluation index system for chemical dust suppressant performance, including wetting performance, moisture absorption performance, adhesion performance, the annual cost per unit area, the pH value of the dust suppression liquid, chemical toxicity, etc. Among them, the toxicity of the dust suppressant was evaluated by its LD50. The indicator that characterizes the corrosion performance of dust suppressants is the corrosion rate of Q235 steel. The article also provides the classification of chemical acute toxicity, the corrosion rate of Q235 steel, and the corresponding standard test methods. The results are consistent with the phenomena observed in the experiment, in line with conventional understanding, and have strong confidence. This method can provide a standardized evaluation technique for the comprehensive performance evaluation and comparison of dust suppressants. 3.2. Field Test Results 3.2.1. Dust Suppression EfficiencyThe part of the loess area to be reclaimed in the dumping site was selected for field experiments. The selected area was divided into four areas. We sprayed the same amount of clean water and 0.7%, 1.0%, and 1.3% dust suppressants, respectively.Figure 10 shows the dust suppression efficiency after crusting with different dust suppressants. Comparing the dust data of 0.7%, 1.0%, and 1.3% concentrations with those when no dust suppressant is sprayed, the dust suppression efficiency after the dust suppressant crusting can be clearly obtained, which can effectively solve the dust pollution of the Haerwusu open-pit mine. When the concentration of dust suppressant was 0.7%, the dust in the study area began to rise when the wind speed reached 5 m/s.
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