Method for detecting wrapping oil

Abstract

The invention discloses a method for detecting wrapping oil. The method comprises 1, measuring L0 and b0 values of DAP of unwrapping wrapping oil through a colorimeter, 2, wrapping the DAP treated through the step 1 with the wrapping oil, 3, measuring the L value and b value of the DAP treated through the step 2 with the colorimeter, 4, calculating the values of delta L=L-L0 and delta b=b-b0, and5, determining whether the wrapping oil is qualified, wherein when the delta L is greater than -2.0 and delta b is greater than -2.0, the wrapping oil is qualified and when the delta L is less than orequal to -2.0 and delta b is less than or equal to -2.0, the wrapping oil is unqualified. The method can detect the appearance quality of wrapping oil and measure whether different batches of wrapping oil are qualified. The DAP wrapped by the qualified wrapping oil has the bright yellow surface and beautiful appearance and satisfies the DAP appearance requirements.

Description

technical field [0001] The invention relates to a diammonium phosphate production process, in particular to a method for detecting the quality and color of the diammonium phosphate-coated oil. Background technique [0002] Diammonium phosphate, also known as diammonium hydrogen phosphate, or DAP for short, is a compound fertilizer containing nitrogen and phosphorus. Off-white or dark gray particles, specific gravity 1.619, easily soluble in water, insoluble in ethanol. It has certain hygroscopicity, and it is easy to decompose in humid air, and volatilizes ammonia to become ammonium dihydrogen phosphate. Diammonium phosphate is a high-concentration quick-acting fertilizer, which is suitable for various crops and soils, especially for nitrogen-loving and phosphorus-demanding crops. It can be used as base fertilizer or top dressing, and it should be applied deeply. [0003] During the production process of diammonium phosphate, it needs to be wrapped with oil. The purpose of...

AI Technical Summary

Problems solved by technology

The wrapping oil is a dark green paste-like solid, and the quality of different batches of wrapping oil cannot be distinguished from the appearance. After wrapping DAP with wrapping oil, if the quality of the wrapping oil is unqualified, it will cause a large amount of DAP appearance Unqualified products have brought great losses to the company. Therefore, to solve the problem of DAP product appearance quality has always been the focus and difficulty for companies to break through. Various companies have also tried many methods, all of which are to solve this technical problem, so they developed a product. It is very necessary to detect the appearance quality of wrapped oil by using a detection method for wrapped oil

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