Method for preparing compound fertilizer by utilizing lignin extracted from cotton stalks
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A lignin and compound fertilizer technology, applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems of difficult handling and many impurities, and achieve the effect of simple process, safe operation and low production cost
Pending Publication Date: 2019-05-17
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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Problems solved by technology
[0005] Most of the above patent documents use papermaking black liquor as raw material, so there are many impurities and it is difficult to handle
Method used
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Embodiment 1
[0034] A method for preparing compound fertilizer from lignin extracted from cotton stalks, comprising the following steps:
[0035] (1) Pretreatment: After separating the collected cotton stalk sheath and core, cut into length 8-12cm, after screening, enter the continuous presoaker and contain the aqueous solution of dilute sulfuric acid that mass concentration is 0.4% to carry out presoaking, solid-liquid The ratio is 1:6. The presoaking temperature is 70°C and the time is 0.5h.
[0036] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine, so that its water content is 40%;
[0037] (3) Steam explosion treatment: Put the dehydrated cotton stalks into the steam explosion device for steam explosion treatment; during steam explosion treatment, first pressurize to 2.0MPa with steam, then pressurize to 3.5MPa with compressed air, and maintain the time for 120s , to achieve instant explosion.
[0038] (4) Extracting xylose by water washing: extr...
Embodiment 2
[0045] The method for preparing compound fertilizer from lignin extracted from cotton stalks comprises the following steps:
[0046] (1) Pretreatment: After the collected cotton stalks are separated, they are cut into lengths of 8-12 cm. After screening, they are entered into a continuous presoaker and presoaked with an aqueous solution containing 0.4%% dilute sulfuric acid. The solid-to-liquid ratio is 1: 6. The temperature is 70°C.
[0047] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine, so that its water content is 40%;
[0048] (3) Steam explosion treatment: Put the dehydrated cotton stalks into the steam explosion device for steam explosion treatment; during steam explosion treatment, first pressurize to 2.0MPa with steam, then pressurize to 3.5MPa with compressed air, and maintain the time for 120s , explode instantly.
[0049] (4) Extraction of xylose by water washing: extract xylose from the steam-exploded material with water,...
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Abstract
The invention relates to the technical field of full utilization of cotton stalks and fertilizer preparation and provides a method for preparing a compound fertilizer by utilizing lignin extracted from cotton stalks. The method comprises the following steps: 1) pretreating; 2) drying by extruding; 3) performing steam explosion; 4) extracting xylose by washing with water; 5) hydrolyzing solids after dewatering under the existence of sulfuric acid, thereby acquiring xylose hydrolysate, and then recycling sulfuric acid by filtering xylose hydrolysate and washing liquor with a bipolar membrane, mixing with the washing liquor and recycling xylose; 6) performing filter pressing, thereby acquiring a filtrate, namely, potassium lignin, and then washing the solid till being neutral and directly using for paper-making; 7) using a reverse osmosis membrane for concentrating and spray-drying the pressing filtrate and the washing liquor of solid, thereby acquiring powdered potassium lignin; 8) mixing and pelletizing the powdered potassium lignin, urea, phosphatic fertilizer and additive at a ratio, thereby acquiring a lignin compound fertilizer. The method is simple and is high in operability. The application of lignin extracted from cotton stalks in preparing the compound fertilizer is capable of eliminating potential pollution to soil ecological environment caused by the usage of poor fertilizer modified material.
Description
technical field [0001] The invention relates to the technical field of cotton stalk utilization and fertilizer preparation, in particular to a method for preparing compound fertilizer by using lignin extracted from cotton stalks. Background technique [0002] China is a big agricultural country, as well as a big country in the production and use of chemical fertilizers. For decades, my country's chemical fertilizer industry has developed rapidly, but the problem of low fertilizer utilization is serious. According to statistics, the annual loss rate of nitrogen fertilizer applied in our country is as high as 30%-70% in paddy fields, and 20%-50% in dry farming. A considerable amount of nitrogen, phosphorus, potassium and other fertilizer components are due to fertilizer performance, poor The impact of climate and soil environmental conditions causes loss, enters the water body or volatilizes into the atmospheric environment or remains in the soil environment, which not only c...
Claims
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Application Information
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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 唐印郭志刚雷林刘朝慧李旭初李刚王明权
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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