TH657A - Granules with urea as the main substance And the process of producing such pellets - Google Patents

Abstract

The invention deals with urea-based granules larger than 7 millimeters, which may also contain contaminants. And the method of producing this type of pellets is especially suitable. For use as fertilizer for rice fields and at least 80 percent of Tablets weigh between 0.7-1.3 times the average weight of tablets. These granules consist of a layer of molten substance attached to the surrounding core substance. And has a crushing resistance of 20-40 kilograms, pellet production can be By feeding the heated melt Or solution onto particles of Solid in the turntable The fed solid contains particles used Is a minority The ratio between these two currents should be between 150 and 1: 5. The ratio between the average diameter of the pellet is maintained. This is a closed process and can be multi-step. Making larger pellets, for example, 15 mm, should be performed in two separate steps. Separate storage tanks for particles used It is the core and the particles are fed back and converted to the stacked material, cool and sieve:

Claims (6)

1.Large urea-based pellets that may contain commonly used additives such as formaldehyde. The nutrients that plants need Small quantity And the macronutrients of plants, which are characterized by the average pellets diameter greater than 7 mm, and at least 80% of the pellets weigh in the range of 0.7-1.3 times the average weight of these pellets and pellets. With multiple layers of molten, at least 1 core particle is covered and these pellets have a crushing resistance of 20-40 kg. 2. Large granules containing urea as the main substance according to claim 1, characterized by 90-95 percent of the pellets weighing in the range of 0.8-1.2 times the average tablet weight. 3. Active pellet making method to make urea-containing pellets. Principle according to claim 1 or 2, with u Warm rea with low water content or molten urea may also contain impurities. And the solids that have cooled down on the turntable that In a slope The heated liquid freezes on the particles that It is a solid and a characteristic larger particle is formed where the heated liquid is fed onto the solid particles that are fed. Into such a way that a minority is in the form of a fine core substance and Large as feedback particles And the particles produced by this method will It is removed from the plate and cooled and the ores are removed into too large ones. And particles that are too small and use almost all the latter as feedback particles, which are Coated with a heated liquid again. And maintain the ratio between The average diameter of the granules that leave the plate with the particles Use it as an axis to be lower than 3. 4. Method according to claim 3, which is specific to The granular particles are fed via a separate storage tank in the As the particle is fed back through another hopper. And the ratio between the average diameter of the pellets Coming out of the plate with the particles used as the axis are lower than 2 1. 6. Any method of claim 3-5. Which are unique to Perform pellets in a two-step process. Each process consists of one plate, one storage tank for the feedback particles, one storage tank for the core particles and converting the collected substances. To cool And equipment for minerals And using products from The first step is the core particle for the second step, and the core particle is made for the first step from the particle. That are too large by grinding and ore (6 claims, 2 pages, 2 photos)