Forum pracy nad projektem wskrzeszenia The Forge

[defgf60hv]

Slow floating laboratory studies of urea


Methods. Zhu Zhu F f word stems of silver carp love sac \fertilizer industry development direction. New species such as large granular urea,[link widoczny dla zalogowanych], urea, coated urea, urea and other common long-term production of complex, high cost disadvantage. Industrial Technology Institute in Japan developed the added starch production of urea release rate can be freely set the slow-release fertilizer. We have developed on the basis of material prepared using starch as the slow float of urea, widely source of raw materials, simple process, urea nitrogen can slow the release, and can float in the water, can be used as feed in aquaculture. In environmental protection but also as a leak in the road, rail and marine oil in the microbiological degradation of oil adsorption of nitrogen and so on. 2 Test r1] 2.1 experimental materials urea, starch and urea-formaldehyde resin. 2.2 Methods in the reactor by adding appropriate amount of water and starch, heating the mixture under stirring, the starch paste to form a more dilute solution,[link widoczny dla zalogowanych], the amount of urea required to join a one-time, stirring until completely dissolved urea, urea formaldehyde resin joined to improve their water resistance, and adjusted with HCl or NaOH feed solution pH. Finally, add cross-linking agent to further improve its water resistance and viscosity. Reaction temperature is about 8OlC, stir the slurry to gradually cooling to 20 ~ 30 ��, the extrusion granulator granulator finished. 2.3 The discussion of process conditions affect the quality of fertilizer slow-main factors: �� the proportion of starch, urea accounted for, namely St / Ur �� alkalinity of water-soluble starch; �� addition of other additives and reaction temperature, reaction time. In this experiment, reaction time and reaction temperature constant. Based on the above factors, the selected orthogonal design experiment. Factor level is shown in table 1. Table 1 factor level table level / factor urea-formaldehyde resin (g) St / Ur (~) water (II11) pI-[value of the cross-linking agent A (g) 15525522101015733151510944205256O use orthogonal s (6 �� 3) experiment, a total of 18 experiments, obtained on the slow-fertilizer were evaluated. Evaluation methods: The fertilizer particles prepared (pre-weighed) in a certain volume of distilled water soaking, the soaking solution per hour of lessons in which a certain volume of nitrogen content in the original total nitrogen content of fertilizer compared to that obtained The hour of nitrogen fertilizer in the water dissolution rate. Dissolution rate of nitrogen fertilizer in the slow little better. The results in Table 2. To 1h nitrogen dissolution rate as the evaluation of orthogonal experimental results, analysis of variance and significance test, we obtained the nitrogen dissolution rate of the factors and levels: the greatest impact for the starch accounted for urea ratio, followed by urea-formaldehyde resin content and pH, water and the impact of cross-linking agent El Received on: I998 A O1-19 Henan Chemical No. 6 of 1998 ring smaller. Table 2 Urea slow floating orthogonal orthogonal experimental results obtained from the optimum conditions are as follows: starch / urea for a 15, the dosage of urea-formaldehyde resin, 5g, pH value to 7, water 15ml, crosslinking agent A. 3g. Obtained by the above optimal conditions of fertilizer recorded as SU, total nitrogen content was 38.5, the manure into a ball easily, * 17 * easy to dry naturally, without drying. 5h before the dissolution of nitrogen in the fertilizer fast, 5h after the slow dissolution of nitrogen, soaked in water began to float 3 ~ 4h, 4 to 5 days after the particles remain intact, and the half-suspended in water. The fertilizer and urea and granular urea (add some slow-release agent) of the slow-comparison. Urea flood damage, the particles dissolve quickly disappeared,[link widoczny dla zalogowanych], almost no slow-; granular urea (denoted as GU) gradually dissolved nitrogen dissolution rate measured results see attached map. Tian Z fan out of the provision when the same chain (h) photo SU, GU dissolution rate of fertilizer nitrogen 3 Conclusions The method used to take slow-urea system, the method is simple,[link widoczny dla zalogowanych], the urea nitrogen in slow-significant increase over the same time can added during the preparation of phosphorus, potassium and trace elements made of composite fertilizer. But still at the laboratory stage,[link widoczny dla zalogowanych], needs further study. Note: The experimental work was also attended 96th Ma Xiangdong, Guo Juntao students.
More articles related to topics：


ugg boots sale Oil biodegradability of wastewater

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]