A kind of core-shell light aggregate and its preparation method

A light aggregate and core-shell technology is applied in the field of core-shell light aggregate and its preparation, which can solve the problems of lack of light aggregate and low utilization rate of solid waste resources, reduce sludge odor and improve solid waste resource utilization. The effect of utilization

Active Publication Date: 2021-04-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a core-shell light aggregate to solve the problems of lack of light aggregate for hydroponic plants and low utilization rate of solid waste resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A core-shell light aggregate, comprising an inner core and an outer shell; the mass ratio of the inner core and the outer shell is 1:1;

[0030] In terms of mass percentage, the inner core includes the following components: sludge: 65%, superphosphate: 8%, potassium sulfate: 6%, manganese nitrate: 7%, ammonium phosphate: 5%, sodium chloride: 9%;

[0031] In terms of mass percentage, the shell includes the following components: polluted soil: 75%, sludge: 15%, glass powder: 10%.

[0032] The method for preparing the above-mentioned core-shell light aggregate specifically comprises the following steps:

[0033] 1) According to the above raw material ratio, stir the sludge with calcium phosphate, potassium sulfate, manganese nitrate, ammonium phosphate, and sodium chloride to mix evenly, and then granulate into balls through a ball forming machine. The rotating speed of the machine is 35r / min, and the inclination angle of the disc rotation is 45° to obtain the core green ...

Embodiment 2

[0039] A core-shell light aggregate, comprising an inner core and an outer shell; the mass ratio of the inner core and the outer shell is 1:1;

[0040] In terms of mass percentage, the inner core includes the following components: sludge: 73%, superphosphate: 8%, potassium sulfate: 5%, manganese nitrate: 4%, ammonium phosphate: 6%, sodium chloride: 4%;

[0041] In terms of mass percentage, the shell includes the following components: polluted soil: 75%, sludge: 15%, glass powder: 10%.

[0042] The method for preparing the above-mentioned core-shell light aggregate specifically comprises the following steps:

[0043] 1) According to the above raw material ratio, stir the sludge with calcium phosphate, potassium sulfate, manganese nitrate, ammonium phosphate, and sodium chloride to mix evenly, and then granulate into balls through a ball forming machine. The rotating speed of the machine is 35r / min, and the inclination angle of the disc rotation is 45° to obtain the core green ...

Embodiment 3

[0049] A core-shell light aggregate, comprising an inner core and an outer shell; the mass ratio of the inner core and the outer shell is 1:1;

[0050]In terms of mass percentage, the inner core includes the following components: sludge: 65%, superphosphate: 8%, potassium sulfate: 6%, manganese nitrate: 7%, ammonium phosphate: 5%, sodium chloride: 9%;

[0051] In terms of mass percentage, the shell includes the following components: polluted soil: 75%, sludge: 15%, glass powder: 10%.

[0052] The method for preparing the above-mentioned core-shell light aggregate specifically comprises the following steps:

[0053] 1) According to the above raw material ratio, stir the sludge with calcium phosphate, potassium sulfate, manganese nitrate, ammonium phosphate, and sodium chloride to mix evenly, and then granulate into balls through a ball forming machine. The rotating speed of the machine is 35r / min, and the inclination angle of the disc rotation is 45° to obtain the core green b...

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Abstract

The invention provides a core-shell light aggregate and a preparation method thereof. The core-shell light aggregate includes an inner core and an outer shell; the mass ratio of the inner core and the outer shell is 1:1 to 2:1; and in terms of mass percentage, the inner core includes the following components : Sludge: 65% to 85%, superphosphate: 6% to 12%, potassium sulfate: 5% to 10%, manganese nitrate: 3% to 8%, ammonium phosphate: 5% to 11%, sodium chloride : 4% to 10%; by mass percentage, the shell includes the following components: polluted soil: 75% to 85%, sludge: 10% to 15%, glass powder: 5% to 10%. The core-shell light aggregate of the present invention uses sludge as the main raw material and adds inorganic salts and plant nutrients containing nitrogen and phosphorus to prepare the core, and then uses polluted soil as the main raw material and adds sintering aid glass powder to prepare the shell. The sintering method wraps the outer shell on the inner core. On the one hand, it improves the utilization rate of solid waste such as sludge and polluted soil. On the other hand, it develops a light aggregate suitable for plant hydroponics, which is very Important economic, environmental protection and scientific research significance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a core-shell light aggregate and a preparation method thereof. Background technique [0002] At present, the hydroponic plant market has broad prospects, and there are few special products to choose from. Lightweight aggregates are widely used in many fields. Due to their certain porosity and permeability, they are used in the restoration of natural water bodies, but they are rarely used in plant hydroponics. Applications are mainly focused on water retention and moisturizing. Moreover, with the development of mineral resources and soil chemical pollution, a large amount of solid waste has been generated, which has brought serious environmental and social problems. [0003] Therefore, it is of great significance to develop a light aggregate that is suitable for plant hydroponics and can utilize solid waste such as sludge and polluted soil. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/132C04B33/13C04B38/02A01G31/00C05G3/40C05G5/35C05G5/12
CPCY02P40/60
Inventor 蹇守卫高文斌李宝栋李相国谭洪波黄健吕阳马保国吴任迪黄伟超樊黎
Owner WUHAN UNIV OF TECH
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