Study On The Quicker Testing Method Of The Anti-caking And The Slow-release Technology Of The Wrapped Fertilizer And The Preparation Of The Envelope

This paper has summarized the actuality and development of fertilizer, and introduced the mechanism of the agglomeration of grain-fertilizer. The anti-caking and slow-release wrapped fertilizer should be the direction of grain-fertilizer. Because of testing methods in existence of these two functions have limited the exploitation and production of anti-caking and the slow-release technology of grain-fertilizer in a way. The author does research about the effects of temperature, humidity, time on the degree of anti-caking capability. The paper advances the quicker estimate method of the anti-caking capability, which can be done by a constant temperature and humidity box, the method is: on the condition of the relative humidity is 95% and the temperature is 60℃, draw the caking capability curve (the ordinate is the agglomeration rate and the abscissa is time) of complex fertilizer; On the condition of the relative humidity is 85% and the temperature is 40℃, draw the caking capability curve of urea. We design a suit of set and do research upon the effects of liquid temperature, velocity, filter hours on the release rate of nutrient and then advances the quicker drench estimate method of the slow-release capability. It is to adjust the liquid velocity of the set to 4ml/min, and draw the release capability curve of fertilizer (the ordinate is the added release rate of nutrient and the abscissa is time). Contrast different caking capability curve or different release capability curve, then we will estimate the anti-caking and the slow-release capability are better or worse upon different fertilizers. In this experiment, the author chooses paraffin, suface-active agents, isinglass, as the raw materials, adding the release agent. Two method of forming process of envelope are employed, the author studies the effects of different mass ratios of materials on the functions about the envelope. Finally the envelope is prepared, which directions is: the mass of paraffin is 20.0g , isinglass 3.0g, suface-active agents 4.0g, the solution of the release agent 2.6ml. The quicker testing methods got in this paper also be used for testing the anti-caking and the slow-release functions of the envelope.