Ammonium sulfate-polyglutamic acid slow-release fertilizer and preparation method thereof

Abstract

The invention discloses an ammonium sulfate-polyglutamic acid slow-release fertilizer and a preparation method thereof, belonging to the field of slow-release fertilizer production. The ammonium sulfate-polyglutamic acid slow-release fertilizer comprises the following components in parts by weight: 45-60 parts of ammonium sulfate, 10-20 parts of potassium dihydrogen phosphate, 15-25 parts of potassium chloride and 0.5-2 parts of polyglutamic acid. The preparation method comprises the following steps: mixing, pulverizing, drying, screening and packaging to obtain the ammonium sulfate-polyglutamic acid slow-release fertilizer. The method solves the problem of treatment of monosodium glutamate production wastewater, increases the monosodium glutamate coproduct value, and enhances the production benefits, The slow-release fertilizer has obvious yield increase effect, and has the functions of fertilizing the soil, improving the soil quality and enhancing the crop quality. Besides, the preparation method is simple in technique and easy to operate; the drying temperature is controlled at 80-100 DEG C in the technical process, thereby lowering the energy consumption; and the nitrogen element can not be easily destroyed, thereby lowering the air pollution.

Description

technical field [0001] The invention belongs to the field of slow-release fertilizer production, and in particular relates to an ammonium sulfate-polyglutamic acid slow-release fertilizer and a preparation method thereof. Background technique [0002] By 2007, my country's monosodium glutamate output reached 1.9129 million tons, and China has become the largest producer of monosodium glutamate. The treatment of waste liquid produced in the production process of monosodium glutamate has always been a headache for monosodium glutamate production enterprises, and ammonium sulfate in waste liquid of monosodium glutamate is an important nitrogen fertilizer raw material. Using it as fertilizer can not only solve the problem of wastewater pollution problems, and can increase the by-product value of MSG production. [0003] Polyglutamic acid (γ-PGA for short) is a biochemically synthesized biopolymer based on glutamic acid, combined with organic carbon sources, nitrogen sources and...

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Problems solved by technology

[0004] In the field of agriculture, my country is a big agricultural country. In the 5000 years of agricultural history, crops often increase the amount of pesticides and fertilizers used to achieve the purpose of increasing production. With the current increase in the amount of agricultural chemical fertilizers, a series of problems have been brought about. Soil and environmental problems: 1), the marginal efficiency of applying chemical fertilizers and pesticides decreases year by year, and the yield of crops stagnates; 2), the quality of agricultural products declines, the content of heavy metals exceeds the standard, and people's health is seriously threatened; 3), soil acidity and alkalinity 4) The world's energy shortage has led to rising production costs of chemical fertilizers, increased agricultural investment, high sales prices of grain and vegetables, increased living costs, and increased living pressure

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