Alkaline powder for treating leaked liquid chlorine and chlorine gas and preparation method of alkaline powder

Abstract

The invention provides an alkaline powder for treating leaked liquid chlorine and chlorine gas and a preparation method of the alkaline powder. The alkaline powder is prepared from three components including a capturing agent, a moisture-proof agent and an additive according to a specific proportion through a specific method. The materials for preparing the alkaline powder are easily available, the preparation method is simple, the energy consumption is low, the grain size of the prepared powder is 80 meshes-150 meshes, the specific surface area is bigger than 50m<2> / g, the bulk density is bigger than 0.83g / cm<3>, the powder does not block, and the relevant requirements of standard AQ3015 are satisfied. In a sealed non-wind environment, the chlorine gas absorption rate is not smaller than 95% within three minutes, and not smaller than 99% within 10 minutes; moreover, the alkaline powder has good settling performance after being sprayed and has a settling recovery rate not smaller than 98% within 2 minutes.

Description

technical field [0001] The invention relates to the field of emergency treatment for leakage of highly corrosive dangerous chemicals, in particular to an alkaline powder for disposing of leaked liquid chlorine and its gas and a preparation method thereof. Background technique [0002] Liquid chlorine is a strong oxidizing and corrosive inorganic elemental substance. It is light yellow-green at room temperature and has strong volatility. The volatilized gas has a strong pungent smell and can damage the organs and systems of the whole body. Chlorine gas is heavier than air and can spread with the wind on the ground, endangering animals, plants and other objects within the diffusion range, and will hide in low-lying areas for a long time when there is no wind. Liquid chlorine is obtained by liquefaction of chlorine gas after pressurization. The storage pressure is relatively high, coupled with the chemical activity of chlorine gas, so chlorine gas must be packed in a special ai...

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Problems solved by technology

[0008] For the disposal of leaked chlorine gas, there are two methods at this stage: direct dosing of reinforced alkali, quicklime treatment method and water dilution method. The direct dosing method has low treatment efficiency for volatile chlorine gas and will cause air pollution; the water dilution method can only Absorbs 2 cubic meters of chlorine, so it will cause pollution transfer and huge waste of water resources

[0009] Disclosed in CN1066991A is a method for removing leaking chlorine gas with a solution, specifically 8% to 12% dilute ammonia water, 30% to 45% sodium thiosulfate solution, 20% to 30% potassium iodide solution and 10% to 30% % ammonium sulfide solution, although the method is simple and quick, the cost is generally high except dilute ammonia water, and it will bring follow-up health and environmental pollution problems

CN101322904A discloses a liquid decontamination agent for chlorine leakage mainly based on an organic reducing agent. The decontamination efficiency of the decontamination agent for low-concentration chlorine leakage in 10 minutes reaches more than 70%. Easy to cause clogging when spraying mist

[0010] CN1070589A discloses a preparation method of a high-efficiency chlorine gas scavenger, that is, dissolving block lime in an alkaline solution at 20°C to 80°C, and adding a certain amount of moisture-proof agent, organic solvent, surfactant and dispersant It is formed by stirring, concentrating, drying, and sieving. The powder obtained by this method has a small specific surface area, and the experimental capture and elimination rate is only 84.3%, and the energy consumption is relatively high.

CN100482321C discloses a chlorine gas catcher, which is based on calcium hydroxide, supplemented with surfactant, film-coated desiccant and diluent, sodium silicate, this catcher is less than 5 μm in particle size, the sedimentation effect Poor, the air pollution is serious during implementation

CN101810991B discloses a preparation method of chlorine leakage disposal powder based on sodium thiosulfate, that is, sodium thiosulfate and a small amount of magnesium stearate, sodium dodecylbenzenesulfonate and sodium silicate are crushed at high speed and mixing, and sieve out the part with a particle size less than 400 meshes, which is the prepared powder; the powder prepared by this method has a small particle size, and it is easy to cause air pollution when spraying, and it does not meet the relevant requirements of the standard AQ3015-2008

[0011] Zhao Huiling from Taiyuan University of Technology studied the adsorption performance of NaY and modified NaY molecular sieves on chlorine gas, and compared with NaY and NH 4 NO 3 Compared with the modified NaY molecular sieve, the EDTA-modified NaY molecular sieve has a greater adsorption capacity for chlorine gas, with a maximum difference of 30.6%, and the adsorption is physical adsorption, which is conducive to regeneration and utilization. However, due to the complicated manufacturing process and high cost, it is difficult to Practical application in the disposal of chlorine gas leakage

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