37results about "Alkali metal nitrate shape formation" patented technology

The invention provides a membrane-assisted nucleation cooling crystallization method, and belongs to the technical field of crystallization engineering. Solution to be crystallized is added into a crystallizing kettle, a computer and a stirring and temperature control device is started, and a cooling liquid loop is started. After a system is stabilized, a peristaltic pump is started, and the solution to be crystallized is conveyed to a membrane component. When crystal nucleuses appear in the membrane component, mother solution with the crystal nucleuses is conveyed to the crystallizing kettle and subjected to crystal growth. By controlling cooling liquid and operation conditions, generation of the crystal nucleuses and crystal growth are systematically regulated, so that an ideal crystal product is obtained.

The invention relates to a preparation method of salt nanoparticles, comprising placing solid inorganic salt in a container to provide a substrate with a flat surface; adjusting the temperature of a heating device to be higher than the melting point of the inorganic salt and lower than the decomposition temperature of the inorganic salt , the container and the base are heated by the heating device, so that the solid inorganic salt melts into a molten liquid state; the molten inorganic salt is dipped with a stick that does not react with the molten inorganic salt, and dropped on a surface that is not infiltrated with the molten inorganic salt. The molten inorganic salt droplets are then removed from the substrate and cooled to obtain inorganic salt nanoparticles on the surface of the substrate. The present invention prepares salt nanoparticles through a melting-cooling method, thereby obtaining salt nanoparticles with particle diameters between several nanometers and several micrometers. In particular, salt nanoparticles with a size below 6 nm can be obtained through the preparation method of the present invention. Therefore, the present invention opens up new means for the preparation of small-sized salt nanoparticles.

The invention discloses a landfill leachate film concentrate reduction and resource recovery treatment system and method. The treatment system includes a submerged combustion evaporation device, an industrial salt production device, a miscellaneous salt resource recovery device, and a waste residue processing device; The extraction device includes a forced circulation evaporation crystallizer for producing industrial salt KCl and NaCl with saturated membrane concentrate, and an industrial salt NaNO with the mother liquor from the forced circulation evaporation crystallizer. 3 、Na 2 SO 4 The flash cooling crystallizer and sodium sulfate evaporator, the miscellaneous salt resource recovery device includes a reaction kettle, and concentrated sulfuric acid is added to the reaction kettle, and the miscellaneous salt produced after the production of industrial salt enters the reaction kettle to react to produce NaHSO 4 , HCl, and the reacted waste salt enters the waste residue treatment device to be solidified and landfilled. The treatment system realizes the separation of industrial salt while immersing, burning, evaporating and reducing the membrane concentrate, reduces the circulation of salt in the environment and makes it a resource, and further improves the economy and environmental protection of landfill leachate membrane concentrate treatment. .

The invention relates to a method of improving the hardness of granular sodium nitrate. According to the method, a waste salt is added by using a hopper and a screw conveyer in the process of conveying the wet sodium nitrate which is obtained by crystallizing through evaporation to a melting tank, wherein the waste salt contains 60-90% by weight of sodium chloride or 10-40% by weight of sodium sulfate. Due to the addition of 0.01-2.5% of the waste salt which contains sodium chloride or sodium sulfate, the hardness of the granular sodium nitrate can be up to 2-4kgf, and the granular sodium nitrate with a size of 2-4mm accounts for more than 96%. Due to the added waste salt which is rich in sodium chloride, the hardness of the granular sodium nitrate can be improved. By adopting the method provided by the invention, the granular sodium nitrate which has a lower content of water, higher roundness and more uniform size than the existing granules can be obtained. In addition, the method can realize continuous production, consumes less energy, is high in efficiency and low in cost and can be particularly applied to the field of tower-based chemical granulation.

The present invention discloses an industrial sodium nitrite product and its production method. The physical and chemical properties of said product are as follows: it is made into the form of ball or egg granular body, grain size is 0.5-3 mm, and the water content of the described granule body is less than or equal to 0.5%. Its production method uses the existent industrial sodium nitrite product as raw material, the above-mentioned raw material is heated and moten into liquid phase, and said liquid phase is sprayed and granulated so as to obtain the invented product. Said product features low water content, no blocking and good fluidity.

The invention relates to a method for drying salts containing crystallization water in a convection device, which can additionally also be heated indirectly. The method is particularly characterized in that the drying takes place above a defined moisture content of the drying gas. The gas surrounding the salt particles during drying has a specific humidity. As a result, the drying speed is favorably influenced.

Provided is a method for pelleting spherical fine particle of sodium nitrate, which comprises the following steps: 1) melting industrial sodium nitrate in a salt melting furnace, introducing into a high-level insulation buffer tank, placing in an atomizer located on top of the pelleting tower, atomizing to obtain fog droplets with size of 30 μm-0.5 mm; 2) introducing freeze-dried high-pressure air into the pelleting tower in a tangent direction from the upper inlet pipe of the tower, so that the sodium nitrate fog droplets obtained in step 1) fall spirally along the wall in the pelleting tower, to obtain sodium nitrate particle; 3) collecting the cooled sodium nitrate particle at the bottom of the tower, and packaging. Sodium nitrate particle with lower water content, higher roundness, and smaller size can be obtained, and continuous production can be realized by the method.