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Snow melting agent is a commonly used method for removing snow in winter. Common snow melting agents at home and abroad are generally divided into potassium acetate (organic snow melting agent) and chloride salt according to the main components. Chloride salt snow melting agents are widely used in China because of their low price and obvious effect.
The principle of snow melting of chloride salt snow melting agent is: "chlorine salt" snow melting agent is dissolved in water (snow), its freezing point is below zero, for example, sodium chloride (salt) is dissolved in water and the freezing point is -10 ° C, chlorine Calcium is about -20 °C, and acetic acid can reach about -30 °C. The freezing point of the brine is lower than the freezing point of the water, so that it is difficult to form ice again after the salt is dissolved in the snow water. In addition, after the snow melting agent is dissolved in water, the ion concentration in the water rises, so that the liquid vapor pressure of the water decreases, but the solid vapor pressure of the ice does not change. In order to reach the state of the solid-liquid vapor pressure of the ice-water mixture, the ice melts. This principle also explains well the fact that salt water is not easy to freeze. Simply put, the snow melting agent reduces the melting point of the snow, making it easier to melt.
When the snow melting agent is used, the effect is not the better. It is necessary to accurately calculate the usage amount and spread evenly for different situations. Therefore, it is forbidden to spread artificial snow melting agents in developed countries, and it is required to use mechanical spreaders with spreaders. However, in China, the spreading of snow melting agents in most cities relies entirely on manual work. It is impossible to achieve precise and uniform, and the snow melting effect is difficult to guarantee, and a large amount of snow melting agent is also wasted, which indirectly leads to its abuse.
The precise dosage of the snow melting agent spreading equipment in developed countries will be calibrated by a special testing agency to determine whether the spreading equipment is usable. Equipment that fails to pass the calibration is strictly prohibited from going on the road for snow removal. China has lacked standards for the manufacture and use of snow melting agents for a long time. It was not until 2002 that Beijing introduced the first local standard for snow melting agents in China, which regulated the corrosiveness and pollution of snow melting agents, and at the same time issued a special “Management Measures for the Use of Snow Melting Agentsâ€. The use of snow melting agent in Beijing has increased year after year, from 1,000 tons in the past to 7,000 tons in 2003 to 30,000 tons in 2010, which is equivalent to the total amount of snow melting agent used in the previous five years.
The concentration and amount of snow melting agent are closely related to the snow melting effect. At the same time, the amount of snow melting agent is controlled, and the salt water concentration after melting is detected, which can greatly reduce the damage to road bridges and soil ecology. ATAGO Chloride Salt Handheld Concentration Rapid Analyzer can be quickly and easily carried around, measuring various kinds of chlorine salts within 3 seconds, such as sodium chloride (NaCl) PAL-03S ( sodium chloride concentration meter ), calcium chloride (CaCl2) PAL-41S ( calcium chloride concentration ), magnesium chloride (MgCl2) concentration PAL-43S ( magnesium chloride concentration ).
The picture shows the ATAGO snow melting agent concentration refractometer
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