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Preparation technical method of urine sulfur radical composite fertilizer

A technology of sulfur-based compound fertilizer and preparation process, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, inorganic fertilizer, etc., can solve the problems of difficult curing of products, low production cost, low phosphorus conversion rate, etc., and achieve easy caking, cost reduction, The effect of high energy consumption

Inactive Publication Date: 2007-09-26
SICHUAN UNIV
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Problems solved by technology

[0003] Aiming at the problems existing in the preparation process of urea-sulfur-based compound fertilizer in the prior art, the object of the present invention is to provide a novel method for preparing urea-sulfur-based compound fertilizer, so as to solve the problems existing in the preparation process of urea-sulfur-based compound fertilizer in the prior art. The conversion rate of phosphorus in phosphate rock is low and the product is difficult to solidify, and the compound fertilizer produced has an ideal ratio of nitrogen to phosphorus, rich in sulfur and calcium elements, and there is no problem of phosphogypsum emission during the production process. Between ordinary calcium and conventional urea ordinary calcium process, it can be directly granulated and potassium element can be added during production, and the production cost is low

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  • Preparation technical method of urine sulfur radical composite fertilizer
  • Preparation technical method of urine sulfur radical composite fertilizer
  • Preparation technical method of urine sulfur radical composite fertilizer

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Embodiment 1

[0032] The process flow of this embodiment is shown in Figure 1. The raw material is phosphorite tailings obtained from Liaoning phosphorite ore after iron separation, P 2 o 5 It is about 30%. 100 parts of phosphate rock powder and 30 parts of water are prepared into phosphate rock slurry, and 40 parts of sulfuric acid with a concentration of 90% are added to acidolysis reactor 1 for acidolysis reaction, and 2 parts of activator dimethyl alkyl brominated agent are added, The reaction temperature is about 130° C., and the reaction time is about 30 minutes. The add-on of sulfuric acid all can be in the scope of 40~80 parts. The fluorine gas produced in the acidolysis reaction enters the fluorine recovery device, and fluorine is recovered in the form of fluorosilicate, and the acidolysis slurry after the reaction enters the conversion reactor 2, and 110 parts of urea are added at the same time to carry out the conversion reaction, and an activator is added 1 part of cationic ...

Embodiment 2

[0034] The process flow of this embodiment is shown in Figure 2. The raw material is still phosphorus tailings with a P2O5 content of about 30% obtained after iron separation from Liaoning phosphate iron ore. The process and process conditions of this embodiment are basically the same as in Example 1, except that the acidolysis reaction and conversion reaction do not add an activator to strengthen the reaction, the reaction time is longer, and the acidolysis reaction time is about 30 ~45 minutes, the conversion reaction time is about 45~60 minutes, and the aging time is about 17 hours, usually 16~20 hours. The conversion rate of phosphate rock is lower, and the conversion rate of phosphate rock in this embodiment is about 80%.

Embodiment 3

[0036] The process flow of this embodiment is shown in Figure 3. The raw material is P 2 o 5 Sichuan Jinhe Phosphate Mine with a content of 28%. 100 parts by weight of phosphate rock powder, 70 parts of water, 70 parts of sulfuric acid with a concentration of 98%, 2 parts of activator nitric acid, all materials are added to acid hydrolysis reactor 1 for acid hydrolysis reaction, the reaction temperature is about 100 °C, and the reaction time is about 20 minute. The add-on of sulfuric acid all can be in the scope of 30~70 parts. The fluorine gas produced in the acidolysis reaction enters the fluorine recovery device, and fluorine is recovered in the form of fluorosilicate. The acidolysis slurry after the reaction enters the conversion reactor 2, and 110 parts of urea are added at the same time, and the activator laurylamine polyoxygen Vinyl ether - 2 parts by weight of 12, the conversion reaction temperature is about 50°C, and the reaction time is about 45 minutes. The con...

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Abstract

The invention discloses a manufacturing method of urea-sulfur based composite fertilizer, which comprises the following steps: (1) reacting sulfuric acid and phosphor according to certain proportion; obtaining acidolyzed slurry; (2) adding quantitative aquacare and slurry into transmitting reactor; obtaining the transmitted slurry; (3) solidifying the product; obtaining the product. The invention adopts phosphor ore as phosphorous source, which saves investing cost effectively.

Description

Technical field: [0001] The invention relates to the preparation technology of compound fertilizer, more specifically, relates to a preparation technology of urea-sulfur-based nitrogen-phosphorus compound fertilizer. Background technique: [0002] Crop growth requires 16 essential nutrients, among which nitrogen, phosphorus, and potassium rank the top three in terms of importance. According to China's soil conditions, the ratio of nitrogen, phosphorus and potassium fertilizers required for crop growth is roughly 2:1:1, but in China's agricultural production and fertilization, the ratio of nitrogen (N), phosphorus (P), and potassium (K) fertilizers has been out of balance for a long time , which is lower than a reasonable level. The reason is that in addition to the low yield of potassium fertilizer, there is also a lack of production technology for compound fertilizers that can simultaneously provide nitrogen, phosphorus, potassium and other nutrients. Ammonium phosphate is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05C9/00C05C3/00C05B11/08C05D3/00B01J2/02
Inventor 刘代俊蒋绍志罗洪波邱礼有张允湘
Owner SICHUAN UNIV
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