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Phosphorus removal material based on collophanite tailings as well as preparation and application methods thereof

An application method and technology of collophosphate rock, applied in the field of phosphorus pollution control, can solve the problems of low phosphorus fixation efficiency and the like

Pending Publication Date: 2020-05-29
陈赫然
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Constructed wetlands and submersible filtration systems are potential technical methods for treating eutrophic water, but the difficulty lies in the low fixation efficiency of phosphorus by ordinary sandstone and other materials, and chemically precipitated calcium phosphorus, aluminum phosphorus, and iron phosphorus are not Phosphorus in a stable state, which will be released into the water again due to changes in pore water composition and pH

Method used

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  • Phosphorus removal material based on collophanite tailings as well as preparation and application methods thereof
  • Phosphorus removal material based on collophanite tailings as well as preparation and application methods thereof
  • Phosphorus removal material based on collophanite tailings as well as preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 200kg of representative collophanite tailings were collected from the tailings pond of the collophosite mine, and its XRD pattern is shown in figure 1 According to chemical phase analysis, its mineral composition is: apatite 31.2%, dolomite 26.3%, quartz 39.5%. figure 2 , where the morphology of apatite is shown in image 3 .

[0043] Put the collophanite tailings into a muffle furnace for calcination at 800°C for 1 hour, and the dolomite in it is completely decomposed into pericalcite (CaO) and periclase (MgO).

[0044] Add water accounting for 40% of the mass of the powder to the calcined powder, mix evenly, and shape it into rod-shaped particles of 3-5mm through an extrusion molding machine, store it for 20 days under saturated humidity and normal temperature conditions, and use 2 Carry out carbonation to convert calcium hydroxide into calcite, and partially hydrate magnesium oxide into magnesium hydroxide and achieve consolidation; the strength of the obtained pa...

Embodiment 2

[0047] This embodiment adopts the same collophantite tailings sand as in embodiment 1.

[0048] Put the collophanite tailings into a muffle furnace for calcination at 800°C for 1 hour, and the dolomite in it is completely decomposed into pericalcite (CaO) and periclase (MgO).

[0049] Add water accounting for 50% of the mass of the powder to the calcined powder, mix evenly, and then extrude it into a 5-10mm sheet, store it for 20 days under saturated humidity and normal temperature conditions, and use the CO in the air 2 Carry out carbonation to convert calcium hydroxide into calcite, and partially hydrate magnesium oxide into magnesium hydroxide and achieve consolidation; the resulting consolidated material is broken and sieved to particles with a particle size of 1-2mm, that is, the target product is obtained based on Phosphorus removal material for collophanite tailings.

[0050] Fill the prepared phosphorus removal material into a glass tube with a diameter of 10cm and a ...

Embodiment 3

[0052] This embodiment adopts the same collophantite tailings sand as in embodiment 1.

[0053] Pass the collophanite tailings sand and calcined dolomite powder (calcined at 800°C for 1 h in a muffle furnace) through a 60-mesh sieve, and mix them evenly according to the mass ratio of 1:1 to obtain a mixed material; add water to the mixed material and stir evenly to make the material Become moist, and shape into particles with a diameter of 5-10mm with a ball forming disc. The molded materials were stored for 20 days under the condition of saturated humidity and normal temperature, and the CO in the air was used to 2 Carry out carbonation to convert calcium hydroxide into calcite, and partially hydrate magnesium oxide into magnesium hydroxide and achieve consolidation; after stockpiling, the particle strength is 60N, that is, the target product is a phosphorus removal material based on collophosite tailings .

[0054] Fill the prepared phosphorus removal material into a glass...

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Abstract

The invention discloses a phosphorus removal material based on collophanite tailings and preparation and application methods thereof, wherein the phosphorus removal material is a granular material obtained by taking the collophanite tailings sand as a main raw material, performing high-temperature thermal activation or mixing with calcined dolomite, molding and solidifying. The obtained material is used as a phosphorus removal infiltration medium material, can be used for deep phosphorus removal of phosphorus-rich water such as domestic sewage, black and odorous water bodies and farmland recession water, and has the advantages of wide raw material source, low material preparation cost and good phosphorus removal effect.

Description

technical field [0001] The invention relates to phosphorus pollution control technology of waste water and surface water body, in particular to a material for removing phosphorus in water. Background technique [0002] The eutrophication of water body is becoming more and more serious, and it is necessary to strengthen the purification treatment of nitrogen and phosphorus pollutants in water. At present, the aerobic activated sludge process is generally used in the treatment of urban domestic sewage. In many cases, it is difficult for domestic sewage to meet the national Class A discharge standard after secondary treatment. Advanced treatment facilities need to be added to ensure that the effluent meets the standard. And even if domestic sewage treatment meets the discharge standard, for eutrophic water bodies, more stringent denitrification and phosphorus removal is required to ensure the ecological environment of the water bodies. In many cases, the secondary treatment ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C05B17/00C02F101/10C02F101/16
CPCB01J20/12C02F1/281C05B17/00C02F2101/105C02F2101/16
Inventor 陈赫然陈天虎汝琳琳
Owner 陈赫然
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