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Core-shell lightweight aggregate and preparation method thereof

A light aggregate, core-shell technology, applied in the field of core-shell light aggregate and its preparation, can solve the problems of lack of light aggregate and low utilization rate of solid waste recycling, reduce sludge odor, and improve solid waste recycling Utilization, economically important effects

Active Publication Date: 2019-05-24
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 core-shell lightweight aggregate and a preparation method thereof. The core-shell lightweight aggregate comprises a core and a shell according to a mass ratio of 1:1-2:1, the core comprises, by weight, 65-85% of sludge, 6-12% of calcium superphosphate, 5-10% of potassium sulfate, 3-8% of manganese nitrate, 5-11% of ammonium phosphate and 4-10% of sodium chloride, and the shell comprises, by mass, 75-85% of polluted soil, 10-15% of sludge and 5-10% of glass powder. The preparation method includes: adopting the sludge as a main raw material, and adding inorganic salt and phytonutrient containing nitrogen and phosphorus to prepare the core; adopting the polluted soil as a main raw material, and adding the glass powder which is a sintering aid to prepare the shell; coating the shell onto the core by means of high-temperature sintering. Recycling rate of solid waste like the sludge and the polluted soil is increased, the lightweight aggregate suitable for plant hydroponics is developed, and the lightweight aggregate is of quite important economic, environment-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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IPC IPC(8): C05G3/00A01G31/00C04B33/132
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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