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Phosphate tailing-based magnesium-calcium particle and preparation method thereof

A technology for phosphorus tailings and particles is applied in the field of magnesium-calcium particles based on phosphorus tailings and their preparation, so as to achieve the effects of improving hydration resistance, low production cost and realizing resource utilization.

Pending Publication Date: 2021-06-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the technology of preparing porous magnesium-calcium particles based on porous magnesium-calcium particles, especially phosphorus tailings.

Method used

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  • Phosphate tailing-based magnesium-calcium particle and preparation method thereof
  • Phosphate tailing-based magnesium-calcium particle and preparation method thereof
  • Phosphate tailing-based magnesium-calcium particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A magnesium-calcium particle based on phosphorus tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0032] First place the phosphorous tailings powder in the hopper of the granulation equipment, start the granulation equipment, then add 12-20wt% water of the phosphate tailings powder into the hopper, and granulate; After all the phosphorous tailings powder in the process is converted into granules, the granulation is stopped, the granules are taken out, left to stand for 24-26 hours, and kept at 100-110°C for 10-12 hours; then placed in a heating furnace, heated at 1500- Keep the temperature at 1600° C. for 4 to 5 hours, and cool to prepare magnesium-calcium particles based on phosphorus tailings.

[0033] The magnesium-calcium particles based on phosphorus tailings prepared in this example are tested: the particle size of the magnesium-calcium particles based on phosphorus tailings is 0.1-5mm; the CaO content of the ma...

Embodiment 2

[0035]A magnesium-calcium particle based on phosphorus tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0036] First place the phosphorous tailings powder in the hopper of the granulation equipment, start the granulation equipment, then add 20-26wt% water of the phosphate tailings powder into the hopper, and granulate; After all the phosphorous tailings powder in the process is converted into granules, the granulation is stopped, the granules are taken out, left standing for 25-27 hours, and kept at 105-115°C for 10-12 hours; then placed in a heating furnace, at 1600- The temperature is kept at 1650° C. for 3 to 4 hours, and then cooled to prepare magnesium-calcium particles based on phosphorus tailings.

[0037] The magnesium-calcium particles based on phosphorus tailings prepared in this example are tested: the particle size of the magnesium-calcium particles based on phosphorus tailings is 2 to 9 mm; the CaO content of th...

Embodiment 3

[0039] A magnesium-calcium particle based on phosphorus tailings and a preparation method thereof. The preparation method described in this embodiment is:

[0040] First place the phosphorous tailings powder in the hopper of the granulation equipment, start the granulation equipment, then add 26-32wt% water of the phosphate tailings powder into the hopper, and granulate; After all the phosphorous tailings powder in the process is converted into granules, the granulation is stopped, the granules are taken out, left to stand for 26-28 hours, and kept at 110-120°C for 10-12 hours; then placed in a heating furnace, at 1650- The temperature is kept at 1700° C. for 1 to 3 hours, and then cooled to prepare magnesium-calcium particles based on phosphorus tailings.

[0041] The magnesium-calcium particles based on phosphorus tailings prepared in this example are tested: the particle size of the magnesium-calcium particles based on phosphorus tailings is 6-12 mm; the CaO content of the...

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Abstract

The invention relates to a phosphate tailing-based magnesium-calcium particle and a preparation method thereof. According to the technical scheme, the method comprises the following steps: firstly, putting a phosphate tailing powder into a charging basket of granulation equipment, starting the granulation equipment, then adding water which is 12-32wt% of the phosphate tailing powder into the charging basket, and performing granulation; after the phosphate tailing powder in the charging basket is completely converted into particles, stopping the granulation, taking out particles, and performing standing and drying; and then in a heating furnace, preserving heat at 1500-1700 DEG C for 1-5 hours, and performing cooling to obtain the phosphate tailing-based magnesium-calcium particle. The particle size of the phosphate tailing powder is 1-200 [mu]m; and in the phosphate tailing powder, the content of P2O5 is not more than 2wt%, the content of MgO is not less than 15wt%, and the content of CaO is not less than 25wt%. The method is simple in process, low in cost, environmentally friendly and high in phosphorus tailing recycling degree, and the prepared product is good in hydration resistance, low in phosphorus content, high in porosity, moderate in volume density and high in alkaline slag erosion resistance, has heat insulation performance and fire resistance at the same time, facilitates energy conservation and consumption reduction and meets the requirement for light weight of materials.

Description

technical field [0001] The invention belongs to the technical field of magnesium-calcium granules. In particular, it relates to a magnesium-calcium particle based on phosphorus tailings and a preparation method thereof. Background technique [0002] Phosphorus tailings are solid wastes produced by phosphate rock enterprises through flotation of phosphate rocks. Flotation of 10,000 tons of phosphate rocks will produce 30-40wt% of phosphorous tailings, and the total amount of phosphorous tailings produced every year is very large (Li Jiyong , Tong Xiong, Han Bin, etc. Research Progress on Comprehensive Utilization of Phosphorus Tailings. Mineral Protection and Utilization, 2015, (5): 5-11). The main components of phosphorous tailings after flotation are dolomite, calcite and fluoroapatite, etc. If they are discarded directly, it will cause a huge waste of resources. At present, there have been many studies on the recycling of phosphorous tailings. The following aspects: (1) ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/043C04B35/057C04B35/447C04B35/626
CPCC04B35/66C04B35/043C04B35/057C04B35/447C04B35/62695
Inventor 魏耀武邓子荣庹康安
Owner WUHAN UNIV OF SCI & TECH
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