| Tourmaline has some applications in the field of environmental protection because it has the function of producing anion and purifying air.But the lack of engineering application research.In this paper,the amount of negative ions and the smoke suppression effect of the material were investigated by means of outdoor measurement and laboratory test.Aiming at the problem of low occurrence rate of tourmaline powder,this paper explored the mechanism of the negative ion generation.Specific work and results are as follows:In order to obtain the distribution law of air negative ion concentration in Fuzhou area.By using the method of dynamic measurement and the method of literature investigation,the negative ion concentration values of campus,scenic area,factory and city were measured and investigated.The test results show that the concentration of air anion is positively correlated with ambient humidity,and negatively correlated with temperature.Thunderstorms can produce a large number of negative ions,the maintenance time is not long;forest area in more than 700/cm3,plastic runway,roads,urban areas generally in 200?700/cm.Preparation of asphalt and cement mortar with negative ion of electric stone powder.The occurrence of four kinds of materials were tested,according to the occurrence of large to small:cement materials>water-based paint>color coating>asphalt materials.The content of electric stone powder is 10%,and the negative ions of the four kinds of materials are 321/cm,264/cm,188/cm,144/cm3,respectively.In order to produce negative ions in the surrounding space,the limestone powder is used as the negative ion material,and the material should be placed in a well ventilated environment.In order to evaluate the smoke suppression effect of the stone powder,ultraviolet spectrophotometry,gravimetric method and thermogravimetric analysis were used to evaluate the amount of smoke produced by different heating temperature,stirring time and smoke suppressant.The test results show that:the influence of the powder on the smoke is small,the temperature,heating time and stirring have great influence on the smoke.The effect of temperature was the most obvious,and the yield of flue gas increased obviously after heating temperature reached 170?.With the increase of heating time,the change value of the amount of smoke increased first and then decreased,and then stabilized.When the heating temperature of the matrix asphalt is 170?,the amount of smoke produced by mixing is no more than a few times.In order to find out the relationship between the particle size,the composition and the occurrence of negative ions,the particle size and composition of the powder and the high radiation powder were analyzed by laser particle size analyzer,scanning electron microscope and fluorescence spectrum.The experimental results show that reducing the particle size of the powder can increase the occurrence of negative ions.By comparing the powder powder with the same particle size distribution and the high radiation powder,it is found that the occurrence of high radiation powder is 10 times higher than that of the powder.The results show that the particle size can be increased by reducing the particle size,and the radioactive elements(Th,U)can significantly increase the amount of powder.The above studies show that the negative range of negative ions produced by the material is small.Negative ion material composition has a great influence on the production of negative ions,and there is still much room for improvement in the future.Based on the research results,it can provide technical reference for the engineering application of negative ion environmental protection pavement material. |
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