Phosphogypsum granular soil and preparation method thereof

A technology of phosphogypsum and granules, which is applied in the field of phosphogypsum granular soil and its preparation, can solve the problems of multi-yard construction and maintenance costs, reduce crop yield and quality, occupy land and farmland, etc., and achieve good water and fertilizer conservation functions, The effect of meeting the needs of plant growth and reducing the cost of raw materials

Inactive Publication Date: 2020-04-03
GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since no effective utilization method has been found, phosphogypsum is mainly stacked, which not only occupies a large amount of land and farmland, but also consumes more yard construction and maintenance costs, and is stored in the open air, exposed to wind, sun, and rain for a long time. Some of the harmful components such as phosphorus and fluorine contained in it will destroy the ecological environment through the atmosphere, soil surface or groundwater, reduce the yield and quality of crops, bring harm to the ecology, directly or indirectly affect the health of local residents, and become industrial solid waste One of the huge amount of pollution sources in China, the loss caused is immeasurable, therefore, the efficient reuse of phosphogypsum is imminent

Method used

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  • Phosphogypsum granular soil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A phosphogypsum granular soil, comprising the following components by weight:

[0043] 100 parts of phosphogypsum;

[0044] 5 parts of bentonite;

[0045] 10 parts of expanded perlite;

[0046] 1 part of polycarboxylate superplasticizer;

[0047] 20 parts of neutral silica sol solution (20% solid content).

[0048] The preparation method of phosphogypsum granular soil in the present embodiment comprises the following steps:

[0049] (1) Weigh each raw material component according to the formula requirements, put phosphogypsum, bentonite, expanded perlite, polycarboxylate superplasticizer in a mixer and mix evenly to obtain a mixture;

[0050] (2) Pour the mixture obtained in step (1) into a high-speed granulator, and spray neutral silica sol solution while granulating at a rotating speed of 20m / s;

[0051] (3) Put the prepared granules into a drying oven at 100°C for drying;

[0052] (4) After the dried granules are screened, the granular soil is obtained after si...

Embodiment 2

[0055] A phosphogypsum granular soil, comprising the following components by weight:

[0056] 100 parts of phosphogypsum;

[0057] 8 parts of calcined kaolin;

[0058] 20 parts of expanded perlite;

[0059] Naphthalene-based superplasticizer 1.5 parts;

[0060] 15 parts of neutral silica sol solution (20% solid content).

[0061] The preparation method of phosphogypsum granular soil in the present embodiment comprises the following steps:

[0062] (1) Weigh each raw material component according to the formula requirements, put phosphogypsum, calcined kaolin, expanded perlite, and naphthalene-based high-efficiency water reducer in a mixer and mix evenly to obtain a mixture;

[0063] (2) Pour the mixture obtained in step (1) into a high-speed granulator, and spray neutral silica sol solution while granulating at a rotating speed of 40m / s;

[0064] (3) Put the prepared granules into an oven at 80°C for drying;

[0065] (4) The dried granules are sieved and sintered to obtain ...

Embodiment 3

[0068] A phosphogypsum granular soil, comprising the following components by weight:

[0069] 100 parts of phosphogypsum;

[0070] 10 parts white clay;

[0071] 15 parts of expanded perlite;

[0072] 1.2 parts of fatty acid superplasticizer;

[0073] 25 parts of neutral silica sol solution (30% solid content).

[0074] The preparation method of phosphogypsum granular soil in the present embodiment comprises the following steps:

[0075] (1) Weigh each raw material component according to the formula requirements, put phosphogypsum, white mud, expanded perlite, and fatty acid-based high-efficiency water reducer in a mixer and mix evenly to obtain a mixture;

[0076] (2) Pour the mixture obtained in step (1) into a high-speed granulator, and spray neutral silica sol solution while granulating at a rotating speed of 50m / s;

[0077] (3) Put the prepared granules into a drying oven at 70°C for drying;

[0078] (4) After the dried granules are screened, the granular soil is obt...

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Abstract

The invention relates to the field of granular soil, particularly to phosphogypsum granular soil and a preparation method thereof. Based on the problem of waste of resources due to phosphogypsum stacking, the invention provides phosphogypsum granular soil and a preparation method thereof so as to achieve the efficient reuse of phosphogypsum and prepare granular soil with good water and fertilizerretention effects. According to the invention, by using phosphogypsum as a main raw material, in a process for changing dihydrate gypsum in the phosphogypsum into insoluble anhydrous gypsum, a large amount of free water and bound water are lost to form a large number of pores formed in granular soil, and expanded perlite is added, is a white granular material with a honeycomb-like structure inside, and has low stacking density and strong water retention function, so that the granular soil has good water and fertilizer retention functions, and has the water retention rate of 65-85%; the granular soil has high strength under the dual action of silica sol bonding and phosphogypsum self-solidification, and the breakage rate under 28 MPa is smaller than 25%; and the granular soil prepared by the method can well meet the growth requirements of plants.

Description

technical field [0001] The invention relates to the field of granular soil, in particular to a phosphogypsum granular soil and a preparation method thereof. Background technique [0002] Phosphogypsum refers to the solid waste produced when sulfuric acid is used to treat phosphate rock to produce phosphoric acid or phosphate fertilizer in the production of phosphoric acid. The main component is calcium sulfate dihydrate, and it also contains free phosphoric acid, phosphate, fluorine compounds, iron, aluminum, magnesium, silicon and other impurities. With the rapid development of my country's phosphorus chemical industry, the accumulated accumulation of phosphogypsum in my country has exceeded 100 million tons, and the annual discharge of phosphogypsum is increasing at a rate of 15% year by year, while the total utilization rate is only about 10%. Since no effective utilization method has been found, phosphogypsum is mainly stacked, which not only occupies a large amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B40/02C05G3/00A01G24/30A01G24/15A01G24/12A01G24/10C04B111/40
CPCC04B28/26C04B40/0263C05D3/00C05G3/00A01G24/10A01G24/12A01G24/15A01G24/30C04B2111/00758C04B2201/50C04B2111/40C04B18/0445C04B14/104C04B14/185C04B2103/302C04B18/023C04B14/10
Inventor 赵凯常杰善窦明岳
Owner GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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