Slow-release glass fertilizer and industrialized production method thereof
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A production method and glass technology, applied in inorganic fertilizers, cyanamide fertilizers, fertilizer mixtures, etc., can solve problems such as less than 1%, no large-scale application, and inability to achieve continuous production, and achieve the effect of solving time-consuming and prolonging fertilizer efficiency.
Active Publication Date: 2017-01-11
INST OF SOIL & FERTILIZER FUJIAN ACADEMY OF AGRI SCI
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Problems solved by technology
Although the research and development of slow and controlled release fertilizers has made great progress, the current use of slow and controlled release fertilizers in the world accounts for less than 1% of the total amount of fertilizers, and so far there are no varieties that are widely used
However, due to the thermal instability of nitrogen, glass fertilizers are usually used in trace element fertilizers, and nitrogen-containing silicate slow-release fertilizer products have not been seen.
Chinese patent (CN102093127A) discloses a glass-based fertilizer and its preparation method prepared by melting (softening) glass by using the heat energy of calcium carbide and nitrogen to generate calcium nitride through the reaction, but it does not involve the industrial production of glass slow-release fertilizers The production process and its flow; at the same time, the reaction production using calcium carbide and nitrogen in a high-temperature furnace can only carry out intermittent production, and cannot achieve continuous production
Chinese patent (CN 104495874A) discloses a method for preparing lime nitrogen, but it is carried out in a settling furnace for nitriding reaction, and it also cannot realize continuous production
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preparation example Construction
[0041] Its preparation method comprises the following steps:
[0042] 1) After the calcium carbide and fluorite are crushed in the jaw crusher respectively, they are ground into a powder with a particle size of less than 2mm by the crusher;
[0043] 2) Use a glass pulverizer to pulverize the waste glass or quartz sand into a powder with a particle size of less than 2mm;
[0044] 3) Proportion the obtained calcium carbide powder, fluorite powder, waste glass or quartz sand powder with potassium salt, soda ash, limestone, dolomite powder, borax and auxiliary materials through the batching system, and then send them into the mixer through the elevator to fully mix; The mixed coarse furnace charge is transported to the ball mill through the conveyor belt, ground into a powder charge with a fineness of less than 100 mesh, and then sent to the storage hopper through the elevator; After weighing and controlling the speed of the scale, spray nitrogen into the rotary furnace, preheat ...
Embodiment 1
[0047] A slow-release glass fertilizer, its raw material ratio is: waste glass 30%, calcium carbide 60%, fluorite 3%, auxiliary materials 7%; wherein, the auxiliary materials used are zinc sulfate, copper sulfate, manganese dioxide, ammonium molybdate and A mixture of iron oxides in a weight ratio of 3:2:2:2:1.
[0048] During the preparation process of the slow-release glass fertilizer, the reaction conditions in the rotary kiln are: 800° C., nitrogen pressure 0.6 kPa, and the rest of the preparation steps are carried out as above.
Embodiment 2
[0050] A slow-release glass fertilizer, its raw material ratio is: quartz sand 50%, calcium carbide 40%, fluorite 1%, soda ash 3%, limestone 3%, dolomite powder 3%.
[0051] During the preparation process of the slow-release glass fertilizer, the reaction conditions in the rotary kiln are: 1100° C., nitrogen pressure 0.8 kPa, and the rest of the preparation steps are carried out as above.
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Abstract
The invention discloses a slow-release glass fertilizer and an industrialized production method thereof. The method comprises the steps that calcium carbide, fluorite and waste glass or quartz sand are crushed and then fully and uniformly mixed with sylvite, sodium carbonate, limestone, dolomite powder, borax and auxiliary materials according to a certain proportion, after the mixture is milled into powder through a ball mill, the powder is conveyed into a rotary furnace, high-temperature reacting is conducted in a nitrogen atmosphere, and then the slow-release glass fertilizer is prepared. According to the method, industrialized continuous production of the glass fertilizer can be achieved, the obtained fertilizer is a nitrogen-potassium composite type slow-release fertilizer, the fertilizer utilization rate can be effectively increased, the topdressing frequency can be decreased, and the labor cost can be reduced; in addition, by adding corresponding medium and trace elements and synergist in the fertilizer, the requirements of plants on the medium and trace nutritional elements in the growth and development process can be met, the crop yield is significantly increased, and the crop quality is significantly improved; meanwhile, the fertilizer has the effects of improving acid soil and inhibiting soil-borne diseases.
Description
technical field [0001] The invention belongs to the technical field of fertilizer preparation, and in particular relates to a slow-release glass fertilizer and an industrial production method thereof. Background technique [0002] As the world's largest fertilizer user, my country has experienced problems such as the decline of fertilizer utilization rate while the amount of fertilizer has been continuously increased in the past ten years. A large number of research results show that the nitrogen use efficiency of field crops in my country is only about 28% at this stage, which is far lower than the average level of developed countries (40%~60%). Therefore, reducing nutrient loss and improving fertilizer use efficiency has become one of the hotspots in the field of agricultural research. A large number of research results show that compared with conventional fertilizers, the nutrient release and supply of slow-release fertilizers are closer to the nutritional characteristic...
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