阅读说明：本技术 一种高塔脲基复合肥降粘剂的制作方法和使用 (Preparation method and application of high-tower urea-based compound fertilizer viscosity reducer ) 是由 邵长龙 刘少欣 刘少华 高云 刘方民 刘方建 董海涛 于 2021-09-18 设计创作，主要内容包括：本发明提供一种高塔脲基复合肥降粘剂的制作方法和使用,涉及复合肥生产工艺技术领域。包括高塔工艺流程、降粘剂原料的选型、降粘剂的制备、降粘剂的使用,本发明提供一种高塔脲基复合肥降粘剂的制作方法和使用,降低了尿素熔点,降低了配方中尿素用量的最低限度,减少尿素在原料中的占比,有利于拓宽高塔工艺的产品系列,降低混合槽内混合物料的粘度,改善混合料浆的流动性,提高产品颗粒的圆润度,减少碎颗粒产生量。(The invention provides a preparation method and application of a high-tower urea-based compound fertilizer viscosity reducer, and relates to the technical field of compound fertilizer production processes. The preparation method and the use of the high-tower urea-based compound fertilizer viscosity reducer provided by the invention reduce the melting point of urea, reduce the minimum dosage of urea in a formula, reduce the proportion of urea in raw materials, contribute to widening the product series of the high-tower process, reduce the viscosity of mixed materials in a mixing tank, improve the fluidity of mixed slurry, improve the roundness of product particles and reduce the generation amount of broken particles.)

1. A method for preparing a viscosity reducer of a high-tower carbamido compound fertilizer is characterized by comprising the following steps: the method comprises the steps of urea melting, raw material treatment, slurry preparation, high tower granulation and product treatment; the urea melting is that urea is conveyed to a spiral conveyer through an electronic belt scale and then enters a urea melting tank through a lifter, a viscosity reducer is added in the urea melting process, the raw materials are processed into potassium chloride, a potassium sulfate mixture and a filler which respectively enter the lifter through the electronic belt scale, the potassium chloride, the potassium sulfate and the filler with the particle size of more than or equal to 1mm enter a crusher for crushing after being sieved and then enter a crusher for sieving circulation again, the potassium chloride, the potassium sulfate and the filler with the particle size of less than 1mm enter a powder heater, monoammonium phosphate and a return material respectively enter the lifter through the electronic belt scale, the monoammonium phosphate and the return material with the particle size of more than or equal to 1mm enter the crusher for crushing after being sieved and then enter the crusher for sieving circulation again, the monoammonium phosphate and the return material with the particle size of less than 1mm enter the powder heater, and the urea in the urea melting tank is prepared into a urea buffering tank, and then the mixture enters a primary mixing tank through a urea buffer tank, potassium chloride, potassium sulfate and a filler in a powder heater enter the primary mixing tank to be mixed with urea, the mixed urea, potassium chloride, potassium sulfate and the filler enter a secondary mixing tank, monoammonium phosphate and a return material in the powder heater enter the secondary mixing tank to be mixed with the urea, potassium chloride, potassium sulfate and the filler, the mixture in the secondary mixing tank is granulated by a high tower, the mixture enters a differential granulator to be granulated, particles fall into a disc material receiver, the product is treated in such a way that the particles on the disc material receiver enter a fluidized bed to be sieved, fine powder and large material obtained by sieving become return materials, and the finished product obtained by sieving enters a powder flow cooler through a hoister and is subjected to film coating and oil spraying to be packaged.

2. The method for preparing the viscosity reducer of the high-tower ureido compound fertilizer according to claim 1, which is characterized in that: the viscosity reducer comprises a carrier raw material and a surfactant, wherein the carrier raw material is magnesium sulfate heptahydrate, the surfactant comprises a nonionic surfactant, an anionic surfactant and a cationic surfactant, the nonionic surfactant is a polyoxyethylene propylene glycol ether-ether emulsified copolymer (liquid), the anionic surfactant is fatty acid methyl ester ethoxylate sulfonate (liquid), and the cationic surfactant is polyquaternium-11 (liquid).

3. The method for preparing the viscosity reducer of the high-tower ureido compound fertilizer according to claim 1, which is characterized in that: carrier raw materials: nonionic surfactant: anionic surfactant: the cationic surfactant is 80-90:4-8:3-6: 3-6.

4. The method for preparing the viscosity reducer of the high-tower ureido compound fertilizer according to claim 1, which is characterized in that: a double-shaft gravity-free stirrer is used as mixing equipment, carrier raw materials are weighed by a weightless scale and then put into the double-shaft gravity-free mixer, the gravity-free mixer is started, after the operation is stable, nonionic surfactant, anionic surfactant and cationic surfactant are added successively, the surfactants are all liquid, a metering pump is used for quantitative addition during addition, the interval between the addition of each surfactant is 1-3 minutes, and the metering package is carried out after the addition of all the surfactants is finished.

5. The use of the viscosity reducer for the high-tower ureido compound fertilizer according to claim 1, wherein the viscosity reducer comprises: when the dosage of the urea is more than or equal to 36 percent and the dosage of the monoammonium phosphate is less than or equal to 20 percent, the viscosity reducer is added by 1 to 2 percent; when the dosage of the urea is more than or equal to 36 percent and the dosage of the monoammonium phosphate is more than 20 percent, 2 to 3 percent of the viscosity reducer is added; when the dosage of the urea is more than or equal to 32% and less than 36%, the viscosity reducer is added by 3% -4%.

6. The use of the viscosity reducer for the high-tower ureido compound fertilizer according to claim 1, wherein the viscosity reducer comprises: the adding and metering equipment adopts a spiral or electronic belt scale, the viscosity reducer is independently added at the urea melting tank and interlocked with other metering equipment of the production system, and then enters a primary mixing tank and a secondary mixing tank along with the urea melting liquid, and is then mixed with other materials to form slurry with good fluidity.

Technical Field

The invention provides a preparation method and application of a high-tower urea-based compound fertilizer viscosity reducer, and relates to the technical field of compound fertilizer production processes.

Background

A high tower urea-based compound fertilizer (called a high tower granulation compound fertilizer) is one of new technologies of compound fertilizer production processes in China, after molten urea is mixed with monoammonium phosphate and potassium chloride (or potassium sulfate), mixed slurry with a eutectic point and certain fluidity can be formed, the slurry is sprayed out through a special spray head at the upper part of a high tower, the mixed slurry is cooled and formed in the process of natural falling of the tower, and the high tower compound fertilizer can be obtained after subsequent screening and oil spraying and powder dusting treatment;

at present, high-tower compound fertilizers have mature process technologies for producing high-nitrogen series products, but have little difficulty for producing balanced fertilizer series products, when the dosage of urea is more than 38%, the production condition is relatively good, but the content of biuret in the products needs to be warned at any moment, so that the phenomenon of burning seedlings when the biuret is applied to soil is avoided; when the dosage of the urea is 36 percent or less, the method has higher requirements on the performance of equipment, process operation, control indexes, raw material quality and the like, but the productivity of the equipment, the quality of products and the continuity of production cannot be guaranteed, and even the conditions of overflowing, solidification in a mixing tank and the like occur.

Disclosure of Invention

In order to solve the problems, the invention provides a preparation method and application of the viscosity reducer for the high-tower urea-based compound fertilizer, which can reduce the minimum use amount of urea in a formula, reduce the viscosity of slurry in a mixing tank and reduce the output of broken particles, flat particles and long-strip particles.

The invention provides a preparation method of a high tower urea-based compound fertilizer viscosity reducer, which comprises urea melting, raw material treatment, slurry preparation, high tower granulation and product treatment; the urea melting is that urea is conveyed to a spiral conveyer through an electronic belt scale and then enters a urea melting tank through a lifter, a viscosity reducer is added in the urea melting process, the raw materials are processed into potassium chloride, a potassium sulfate mixture and a filler which respectively enter the lifter through the electronic belt scale, the potassium chloride, the potassium sulfate and the filler with the particle size of more than or equal to 1mm enter a crusher for crushing after being sieved and then enter a crusher for sieving circulation again, the potassium chloride, the potassium sulfate and the filler with the particle size of less than 1mm enter a powder heater, monoammonium phosphate and a return material respectively enter the lifter through the electronic belt scale, the monoammonium phosphate and the return material with the particle size of more than or equal to 1mm enter the crusher for crushing after being sieved and then enter the crusher for sieving circulation again, the monoammonium phosphate and the return material with the particle size of less than 1mm enter the powder heater, and the urea in the urea melting tank is prepared into a urea buffering tank, and then the mixture enters a primary mixing tank through a urea buffer tank, potassium chloride, potassium sulfate and a filler in a powder heater enter the primary mixing tank to be mixed with urea, the mixed urea, potassium chloride, potassium sulfate and the filler enter a secondary mixing tank, monoammonium phosphate and a return material in the powder heater enter the secondary mixing tank to be mixed with the urea, potassium chloride, potassium sulfate and the filler, the mixture in the secondary mixing tank is granulated by a high tower, the mixture enters a differential granulator to be granulated, particles fall into a disc material receiver, the product is treated in such a way that the particles on the disc material receiver enter a fluidized bed to be sieved, fine powder and large material obtained by sieving become return materials, and the finished product obtained by sieving enters a powder flow cooler through a hoister and is subjected to film coating and oil spraying to be packaged.

The viscosity reducer comprises a carrier raw material and a surfactant, wherein the carrier raw material is magnesium sulfate heptahydrate, the surfactant comprises a nonionic surfactant, an anionic surfactant and a cationic surfactant, the nonionic surfactant is a polyoxyethylene propylene glycol ether-ether emulsified copolymer (liquid), the anionic surfactant is fatty acid methyl ester ethoxylate sulfonate (liquid), and the cationic surfactant is polyquaternium-11 (liquid).

Carrier raw materials: nonionic surfactant: anionic surfactant: the cationic surfactant is 80-90:4-8:3-6: 3-6.

A double-shaft gravity-free stirrer is used as mixing equipment, carrier raw materials are weighed by a weightless scale and then put into the double-shaft gravity-free mixer, the gravity-free mixer is started, after the operation is stable, nonionic surfactant, anionic surfactant and cationic surfactant are added successively, the surfactants are all liquid, a metering pump is used for quantitative addition during addition, the interval between the addition of each surfactant is 1-3 minutes, and the metering package is carried out after the addition of all the surfactants is finished.

When the dosage of the urea is more than or equal to 36 percent and the dosage of the monoammonium phosphate is less than or equal to 20 percent, the viscosity reducer is added by 1 to 2 percent; when the dosage of the urea is more than or equal to 36 percent and the dosage of the monoammonium phosphate is more than 20 percent, 2 to 3 percent of the viscosity reducer is added; when the dosage of the urea is more than or equal to 32% and less than 36%, the viscosity reducer is added by 3% -4%.

The adding and metering equipment adopts a spiral or electronic belt scale, the viscosity reducer is independently added at the urea melting tank and interlocked with other metering equipment of the production system, and then enters a primary mixing tank and a secondary mixing tank along with the urea melting liquid, and is then mixed with other materials to form slurry with good fluidity.

The invention has the beneficial effects that:

the invention provides a preparation method and application of a high-tower urea-based compound fertilizer viscosity reducer, which reduces the melting point of urea, the minimum use level of urea in a formula, reduces the proportion of urea in raw materials, is beneficial to widening the product series of high-tower processes, reduces the viscosity of mixed materials in a mixing tank, improves the fluidity of mixed slurry, improves the roundness of product particles and reduces the generation amount of broken particles.

Drawings

FIG. 1 is a process flow diagram of a method for preparing the viscosity reducer of the high-tower ureido compound fertilizer and a high-tower process used in the method.

FIG. 2 is a flow chart of a method for preparing the viscosity reducer for the high-tower ureido compound fertilizer and a flow chart of the viscosity reducer.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in figure 1, the invention provides a preparation method of a high tower urea-based compound fertilizer viscosity reducer, which comprises urea melting, raw material treatment, slurry preparation, high tower granulation and product treatment; the urea melting is that urea is conveyed to a spiral conveyer through an electronic belt scale and then enters a urea melting tank through a lifter, a viscosity reducer is added in the urea melting process, the raw materials are processed into potassium chloride, a potassium sulfate mixture and a filler which respectively enter the lifter through the electronic belt scale, the potassium chloride, the potassium sulfate and the filler with the particle size of more than or equal to 1mm enter a crusher for crushing after being sieved and then enter a crusher for sieving circulation again, the potassium chloride, the potassium sulfate and the filler with the particle size of less than 1mm enter a powder heater, monoammonium phosphate and a return material respectively enter the lifter through the electronic belt scale, the monoammonium phosphate and the return material with the particle size of more than or equal to 1mm enter the crusher for crushing after being sieved and then enter the crusher for sieving circulation again, the monoammonium phosphate and the return material with the particle size of less than 1mm enter the powder heater, and the urea in the urea melting tank is prepared into a urea buffering tank, and then the mixture enters a primary mixing tank through a urea buffer tank, potassium chloride, potassium sulfate and a filler in a powder heater enter the primary mixing tank to be mixed with urea, the mixed urea, potassium chloride, potassium sulfate and the filler enter a secondary mixing tank, monoammonium phosphate and a return material in the powder heater enter the secondary mixing tank to be mixed with the urea, potassium chloride, potassium sulfate and the filler, the mixture in the secondary mixing tank is granulated by a high tower, the mixture enters a differential granulator to be granulated, particles fall into a disc material receiver, the product is treated in such a way that the particles on the disc material receiver enter a fluidized bed to be sieved, fine powder and large material obtained by sieving become return materials, and the finished product obtained by sieving enters a powder flow cooler through a hoister and is subjected to film coating and oil spraying to be packaged.

The viscosity reducer comprises a carrier raw material and a surfactant, wherein the carrier raw material is magnesium sulfate heptahydrate, the surfactant comprises a nonionic surfactant, an anionic surfactant and a cationic surfactant, the nonionic surfactant is a polyoxyethylene propylene glycol ether-ether emulsified copolymer (liquid), the anionic surfactant is fatty acid methyl ester ethoxylate sulfonate (liquid), and the cationic surfactant is polyquaternium-11 (liquid).

Carrier raw materials: nonionic surfactant: anionic surfactant: the cationic surfactant is 80-90:4-8:3-6: 3-6.

A double-shaft gravity-free stirrer is used as mixing equipment, carrier raw materials are weighed by a weightless scale and then put into the double-shaft gravity-free mixer, the gravity-free mixer is started, after the operation is stable, nonionic surfactant, anionic surfactant and cationic surfactant are added successively, the surfactants are all liquid, a metering pump is used for quantitative addition during addition, the interval between the addition of each surfactant is 1-3 minutes, and the metering package is carried out after the addition of all the surfactants is finished.

As shown in figure 2, when the dosage of urea is more than or equal to 36% and the dosage of monoammonium phosphate is less than or equal to 20%, the viscosity reducer is added by 1% -2%; when the dosage of the urea is more than or equal to 36 percent and the dosage of the monoammonium phosphate is more than 20 percent, 2 to 3 percent of the viscosity reducer is added; when the dosage of the urea is more than or equal to 32% and less than 36%, the viscosity reducer is added by 3% -4%.

The adding and metering equipment adopts a spiral or electronic belt scale, the viscosity reducer is independently added at the urea melting tank and interlocked with other metering equipment of the production system, and then enters a primary mixing tank and a secondary mixing tank along with the urea melting liquid, and is then mixed with other materials to form slurry with good fluidity.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.