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A kind of soil conditioner and preparation method thereof

A soil conditioner and soil technology, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of large site requirements, secondary pollution, and high costs, and achieve low cost, labor cost savings, and use methods. simple effect

Inactive Publication Date: 2017-10-10
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Adopt soil conditioner to improve soil and also have the following problems at present: (1) cost is high
However, this method needs to stockpile the mixed slurry for 6 to 12 months, which is not only time-consuming, but also requires a large site, and the discharged tailings water will cause secondary pollution to the environment

Method used

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  • A kind of soil conditioner and preparation method thereof
  • A kind of soil conditioner and preparation method thereof
  • A kind of soil conditioner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The reverse flotation phosphorus tailings were calcined at 900°C for 1.5 hours to obtain the calcined product. The XRD diffraction pattern of the reverse flotation phosphorus tailings is shown in the attached figure 1 . From attached figure 1 It can be seen from the above that the calcium magnesium carbonate and calcium fluorophosphate contained in the reverse flotation phosphorus tailings are substances that are not easy to react. At this time, the silicon dioxide contained in it is inactive silicon dioxide and cannot participate in the reaction; after a certain high temperature After calcining (the XRD diffractogram of the prepared active phosphorus tailings after calcining is referring to attached figure 2 ), the above substances are converted into calcium oxide, magnesium oxide, calcium carbonate, silicon dioxide and calcium fluorophosphate, etc., which can react with other substances to produce the required substances; , silicon oxide, etc., accelerate the react...

Embodiment 2-5

[0042] Through the introduction of Example 1, we know that the soil improver can be obtained by calcining and autoclaving the reverse flotation phosphorus tailings, but the soil improver prepared in this way is a poor particle, and it needs to wait for other Decompose under natural action, and just can play a role with soil fusion, onset time is long, and effect is not good, for this reason the present invention provides embodiment 2-5, improves soil conditioner by adding soil raw material wherein, active phosphorus tailings and soil The soil conditioner made after mixing can better integrate with poor soil, so that the soil conditioner can work faster.

[0043] In order to describe the gradual change, the following descriptions refer to reverse flotation phosphorus tailings unless otherwise specified.

[0044] Table 1

[0045] Numbering

Active phosphorus tailings (mass parts)

Soil (mass parts)

2

1

84

3

20

65

4

50

35

...

Embodiment 6-30

[0051] Embodiment 6-30 is a preferred embodiment of the present invention, and the process flow diagram of its preparation method can refer to the attached image 3 .

[0052] The mass ratio of soil to active phosphorus tailings in Examples 6-10 is 84:1, and the distribution ratio of each component is shown in Table 2.

[0053] Table 2

[0054]

[0055] In embodiment 6~10, the step of preparing above-mentioned soil conditioner is as follows:

[0056] The preparation method of the active phosphorus tailings is basically the same as the preparation method of the active phosphorus tailings provided in Examples 2-5. That is, reverse flotation phosphorus tailings are calcined at 800°C for 3 hours, and then crushed and screened. Particles of ≤50 mesh are taken for autoclave curing to obtain active phosphorus tailings. Autoclave curing is at 170-180°C, 0.8 Autoclave curing for 3 to 5 hours under the condition of ~1.0MPa; silica fume is added during autoclave curing, and the dos...

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Abstract

The invention relates to a soil conditioner and a preparation method thereof. The soil conditioner is prepared through the following steps: crushing and sieving reverse flotation phosphorus mineral tailings calcinated at the temperature of 800-1200 DEG C and obtaining active phosphorus mineral tailings with particle diameters less than or equal to 50 mesh obtained through autoclaving curing processing, namely, obtaining the soil conditioner; the preparation method comprises the following steps: the reverse flotation phosphorus mineral tailings are calcinated at the temperature of 800-1200 DEG C and then crushed and sieved; then the crushed and sieved reverse flotation phosphorus mineral tailings are subjected to autoclaving curing under the condition of 170-180 DEG C, 0.8-1.0 MPa for 3-5 h to obtain the soil conditioner. The soil conditioner prepared by the invention has the advantages that the fertilizing value is high and the soil conditioner can be used in mine reclamation and soil amelioration in phosphorus deficient areas and has wider application prospect and avoids secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of soil improvement and solid waste reuse, and relates to a soil conditioner and a preparation method thereof. Background technique [0002] The "Twelfth Five-Year Plan" issued in March 2012 listed energy conservation and environmental protection as the first of the seven strategic emerging industries. Among them, soil remediation is one of the key developments of the environmental protection industry, and it is clearly proposed to strengthen the supervision and management of soil pollution prevention and control. At present, the methods of soil restoration can be roughly divided into three categories: physical, chemical and biological, which are subdivided into the following categories: 1. Thermodynamic restoration, 2. Thermal desorption restoration, 3. Incineration method, 4. Landfill method, 5. .Chemical leaching, 6. Composting, 7. Phytoremediation, 8. Osmotic reaction wall, 9. Bioremediation. Among the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02C05G3/04C09K101/00C05G3/80
Inventor 曹宏薛俊李丹罗丽李先福赖小莹张晖何宾宾
Owner WUHAN INSTITUTE OF TECHNOLOGY
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