CN1314627C - A kind of wrapping and cooling method of diammonium phosphate product - Google Patents

Abstract

The invention discloses a method for wrapping and cooling a diammonium phosphate product. The method is to strictly control the discharge temperature of the diammonium phosphate material at 70-100°C after drying the diammonium phosphate material obtained through ammonification of phosphoric acid , Then put the hot material directly into the wrapping machine for wrapping operation, and send the material out of the wrapping machine into the fluidized bed cooler to cool it below 55°C. Using the method of the present invention, when the diammonium phosphate product is wrapped in the wrapping machine, due to the high temperature of the material, the dispersion of the wrapping oil is good, and the coating of the wrapping oil on the surface of the particles is thin, so that the consumption of the wrapping oil is greatly reduced, which can save The consumption of wrapping oil reduces the production cost; the appearance and color of the wrapped product are uniform and uniform, so that the product has a good appearance image. The method of the invention is suitable for enterprises that use wet-process phosphoric acid to produce diammonium phosphate.

Description

A kind of wrapping and cooling method of diammonium phosphate product

[technical field]

The invention relates to a production process of phosphate fertilizer, in particular to a method for wrapping and cooling diammonium phosphate products.

[Background technique]

As we all know, chemical fertilizers adopt encapsulation technology, which can gradually release the nutrients of fertilizers in the soil, maintain soil fertility for a long time, and avoid the loss of fertilizer nutrients. People have made many achievements in the research of fertilizer wrapping technology, and there are 12 relevant patent applications retrieved, such as CN00114580.0 "mineral wrapped slow-release compound fertilizer and its preparation method", CN02126743.X "for Slow-release outer coating layer of coated slow-release fertilizer", etc.

The traditional diammonium phosphate wrapping technology adopts the process of cooling the fertilizer first and then wrapping it. This process has the following disadvantages: due to the low temperature of the material entering the wrapping machine, the wrapping oil sprayed into the wrapping machine is rapidly lipidized outside the product particles, resulting in that the outside of the product particles cannot be evenly wrapped by the wrapping oil in the wrapping machine. The products after leaving the wrapping machine either do not achieve a consistent appearance color, or because the wrapping oil coating is too thick, resulting in agglomeration problems after packaging. At the same time, because customers have high requirements on the appearance of products, in order to ensure the appearance and color of products, they had to increase the amount of packages. Resulting in increased package oil consumption.

[Content of the invention]

The purpose of the present invention is to provide a wrapping method for diammonium phosphate products that can effectively reduce wrapping oil consumption and improve product appearance quality, so as to overcome the shortcomings of the prior art.

In order to achieve the purpose of this invention, the inventor conducted sufficient experiments on the wrapping effect of the wrapping oil in practice according to the current production situation, and concluded that when the temperature of the product material is between 75 and 85°C, the wrapping oil has the best wrapping effect on the product . After the product temperature is lower than 75°C and enters the wrapping machine, the oil dispersion of the product is not good during the wrapping period. In order to ensure the consistent color of the product, the wrapping oil film will be thicker. When the product temperature is higher than 85°C, the high product temperature will lead to the decomposition of the package oil, which will not only affect the package environment, but also increase the consumption of oil.

According to the experimental results, the wrapping method proposed by the inventor is to strictly control the discharge temperature of the diammonium phosphate material at 70-100°C when the diammonium phosphate material obtained through phosphoric acid ammonification is dried by a controlled dryer, and then the hot material is directly Enter the wrapping machine, carry out the wrapping operation, and send the material from the wrapping machine to the fluidized bed cooler to cool it below 55°C.

The inventor pointed out that the optimal temperature of the hot material entering the wrapping machine is 75-85°C.

Using the method provided by the present invention, when the diammonium phosphate product is wrapped in the wrapping machine, because the temperature of the material is high, the dispersion of the wrapping oil is good, and the coating of the wrapping oil on the surface of the particles is thin, so that the consumption of the wrapping oil is higher than the original one. The consumption of the cooling and re-wrapping process is much smaller. The consumption of product wrapping oil colorant can be reduced from 4.5kg/t to 3.5-4.0kg/t, which can save the consumption of wrapping oil and reduce the production cost. It is 13,000 yuan per 1t of wrapping oil It is calculated that after using this process, the cost of product packaging is reduced by 6.5 to 13 yuan; the appearance and color of the packaged product are uniform and uniform, so that the product has a good appearance image. The method of the invention is suitable for enterprises that use wet-process phosphoric acid to produce diammonium phosphate.

[Example]

In the production of a phosphate fertilizer workshop in a certain factory, after the diammonium phosphate material obtained by ammonification of phosphoric acid is dried with a dryer, the discharge temperature is controlled at 80°C±5°C, and the hot material is sent to the package through a bucket elevator or a conveyor belt The temperature of the packaged material is about 75°C, and then sent to the fluidized cooling bed cooler through the bucket elevator or conveyor belt to cool it to below 55°C, and then packed into the warehouse.

Claims (1)

1. The packaging method of 1 one kinds of diammonium phosphate products, it is characterized in that after the diammonium phosphate material that the phosphoric acid ammonification obtains is used the drying machine drying, the drop temperature of strict control diammonium phosphate material is at 75～85 ℃, then thermal material is directly entered packing machine, wrap up operation, the material that comes out from packing machine and is sent into the fluidized-bed cooler and make it to be cooled to below 55 ℃.