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Method for synergetic stabilization and solidification of ardealite and phosphorite flotation tailings

A technology of flotation tailings and solidification method, which is applied in the direction of solid waste removal, etc., can solve the problems of high pH value and high cost, and achieve the effects of simple operation, reduced environmental pressure, and low cost

Active Publication Date: 2019-08-09
YANGTZE NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quicklime is often used to treat phosphogypsum, but it is expensive and has a high pH value after treatment

Method used

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  • Method for synergetic stabilization and solidification of ardealite and phosphorite flotation tailings
  • Method for synergetic stabilization and solidification of ardealite and phosphorite flotation tailings
  • Method for synergetic stabilization and solidification of ardealite and phosphorite flotation tailings

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Experimental program
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Effect test

Embodiment 1

[0040] 1. The mass ratio of phosphogypsum and phosphate rock flotation tailings compared to PO 4 3- and F - Effect of stable curing

[0041] At room temperature, mix the phosphogypsum and phosphate rock flotation tailings according to the mass ratio of 3:1, 2:1, 1:1, 1:2, and 1:3, respectively, and then stack and solidify at room temperature.

[0042] When the mass ratio of phosphogypsum to phosphate rock flotation tailings decreased from 3:1 to 1:3, the pH value of the stable solidification system increased from 3.4 to 4.1, and PO 4 3- , F － Concentration decreased.

[0043] Such as Figure 1-6 Shown: When phosphogypsum and phosphate rock flotation tailings are stably solidified for 2 days, the mass ratio is reduced from 3:1 to 1:3, PO in the leach solution 4 3- The concentration of F was reduced from 170.4mg / L to 74.0mg / L. － From 34.7mg / L to 11.82mg / L.

[0044] When the mass ratio of phosphogypsum to phosphate rock flotation tailings is 1:1, F in the leachate － an...

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Abstract

The invention discloses a method for synergetic stabilization and solidification of ardealite and phosphorite flotation tailings. The method is characterized in that the ardealite and the phosphoriteflotation tailings are mixed, and an initial pH value of 8-10 is adjusted for stacking and solidification; when a mass ratio between the ardealite and the phosphorite flotation tailings is 1:1 and after 30 days of stabilization and solidification at the initial pH value of 8.0, concentrations of F- and PO43- are 4.0mg / L and 6.01mg / L respectively; and F- and PO43- are stabilized and solidified in forms of (Ca, Mg, Zn)F2 and (Ca, Mg, Zn)3(PO4)2. Results of a leaching experiment show that the concentrations of PO43-, F- and heavy metal ions are within allowable scopes of GB9878-1996 after over 30days of synergetic stabilization and solidification of the ardealite and the phosphorite flotation tailings.

Description

technical field [0001] The invention relates to a method for synergistic and stable solidification of phosphogypsum and phosphorite flotation tailings, which belongs to the field of solid waste solidification. Background technique [0002] At present, the harmless treatment, reuse and residual disposal of solid waste affect the healthy development of the ecological environment. The phosphate fertilizer industry produces a large number of by-products, namely phosphogypsum (PG for short), which is the industrial waste residue (water content 20%-30%) produced in the process of preparing phosphoric acid from phosphate rock and sulfuric acid. It is estimated that approximately 5 tons of phosphogypsum are produced for every 1 ton of phosphoric acid. The chemical equation for phosphoric acid production is as follows: [0003] Ca 5 F(PO 4 ) 3 +5H 2 SO 4 +10H 2 O→3H 3 PO 4 +5CaSO 4 2H 2 O+HF [0004] Phosphogypsum is produced worldwide, and it is estimated that more than...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 李兵
Owner YANGTZE NORMAL UNIVERSITY
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