Compound Fertilizer Area: Test Your Knowledge on 11.11

1. Have the nutrients in the raw materials changed?； 2. Is the batching system operating properly? ； 3. Is the mixture uniform? ； 4. Has the granulation condition deteriorated, resulting in an excess of dry powder that is carried away with the exhaust gas and causes significant losses.

Check whether the feeding amount is in accordance with the recipe; if feeding is done via belt, conduct verification. Examine the granulation balling rate as well as the ratio of coarse to fine recycled material. If necessary, take the granulated material along with the coarse and fine recycled materials for analysis, and then compare them to identify any issues； Check the wind speed of the dryer; if the air flow is too high, sandy substances are likely to be drawn in excessively, leading to imbalances in nutrients.

1. Check the accuracy of the recipe. 2. Verify the accuracy of the ingredients, especially those that are measured electronically. 3. Ensure that the overall system operates properly in terms of circulation. 4. Test whether the raw materials are stable and whether the materials used match what is specified in the recipe, in order to prevent the use of incorrect materials. 5. Check that the packaging bags correspond to the type of product being manufactured. 6. Ensure that the laboratory uses the correct sampling methods

First, check whether there are any fluctuations in the nutrients of various raw materials; second, examine the production logs to determine if the production process was normal. After conducting these checks, an application can be made to the quality control department for a reinspection of the product quality

It could be caused by uneven feeding, or by issues with the quality of the raw materials.

The temperature of mixtures consisting of monoammonium phosphate, potassium chloride, fillers, and recycled materials is generally maintained between 60-90℃； If the temperature is too low, it will lower the temperature of the melt slurry during mixing with urine, increase its viscosity, thereby reducing its fluidity and causing blockages in the pipes and nozzles; this ultimately affects the nutrients in the final product. The concentration, temperature of urine, and the residence time after urea melts affect the nutrients in the final product: the mass fraction of urea in urine should be ≥98%; if the concentration is too low, the particles will become flat during the granulation process ； The urine temperature must be maintained at -135℃ ； Minimize the residence time after urea melting to prevent an increase in the dicyandiamide content in the compound fertilizer. The mixing time for the mixed slurry should be ≤4 minutes, while the mixing temperature of the slurry needs to be maintained between 115 and 125℃ ； Granulation is influenced by three factors: the structural design of the granulation nozzle, the rotation speed, and the viscosity and flowability of the mixed slurry ； At the same time, it is necessary to prevent foreign objects from entering the system, and care must be taken to ensure that the steam pressure is appropriate and that the drain valves can function properly to remove water.

Mainly due to granulation effects, weighing fluctuations, and changes in raw material nutrients

Inspect the problems existing in raw material handling, testing, and granulation processes

When there are sudden fluctuations in the nutrient content of the finished product, the following should be checked: 1. Is the feeding uniform? ； 2. Are there any issues with the quality of the raw materials? ； 3. Are there any mistakes in the process operations? ； 4. Problems in the operation of the granulation cylinder.

1. Caused by uneven feeding. 2. Changes in the composition of the raw materials. 3. Quality issues with the raw material products