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Method for processing phosphate rock tailings

A processing method and a technology of phosphate rock tailings, which are applied in phosphate material treatment, magnesium carbonate, calcium carbonate/strontium/barium, etc., can solve problems that have not been reported in the literature, and achieve pollution avoidance, low energy consumption, and cost reduction Effect

Active Publication Date: 2017-01-11
铜仁市万山区盛和矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no literature reports on the processing of phosphate rock tailings with nitric acid and ammonium nitrate, and the effective recovery of calcium and magnesium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A processing method for phosphorite tailings, characterized in that it comprises the following steps:

[0055] (1) Calcining the mined phosphate rock at 1000°C for 75 minutes, and then digesting it with hot water at 60°C;

[0056] (2) Adding the tailings that have been digested to a concentration of 30% ammonium nitrate solution and 50% nitric acid solution, stirring at room temperature for 80 minutes;

[0057] (3) filtering and washing the slurry after the leaching treatment in step (2) to obtain leaching residue and leaching liquid;

[0058] (4) Stir and leach the leach residue with 20% ammonium sulfate solution at a temperature of 90° C. for 60 min; filter and wash the leached mixed solution to obtain the filter residue and ammonium sulfate leaching solution; dry the filter residue above 100° C. dry to obtain phosphorous concentrate;

[0059] (5) passing the carbon dioxide produced by step (1) calcining and the ammonia produced in steps (2) and (4) leaching process...

Embodiment 2

[0070] A processing method for phosphorite tailings, characterized in that it comprises the following steps:

[0071] (1) Calcining the mined phosphate rock at 1100°C for 60 minutes, and then digesting it with hot water at 80°C;

[0072] (2) Adding the tailings that have been digested to a concentration of 40% ammonium nitrate solution and 65% nitric acid solution, stirring at room temperature for 70 minutes;

[0073] (3) filtering and washing the slurry after the leaching treatment in step (2) to obtain leaching residue and leaching liquid;

[0074] (4) Stir and leach the leach residue with 30% ammonium sulfate solution at a temperature of 80° C. for 70 minutes; filter and wash the mixed solution after leaching to obtain the filter residue and ammonium sulfate leaching solution; dry the filter residue above 100° C. dry to obtain phosphorous concentrate;

[0075] (5) passing the carbon dioxide produced by step (1) calcining and the ammonia produced in steps (2) and (4) leach...

Embodiment 3

[0086] A processing method for phosphorite tailings, characterized in that it comprises the following steps:

[0087] (1) Calcining the mined phosphate rock at 1200°C for 45 minutes, and then digesting it with hot water at 100°C;

[0088] (2) Adding the tailings that have been digested to a concentration of 50% ammonium nitrate solution and 75% nitric acid solution, stirring at room temperature for 60 minutes;

[0089] (3) filtering and washing the slurry after the leaching treatment in step (2) to obtain leaching residue and leaching liquid;

[0090] (4) Stir and leach the leach residue with 30% ammonium sulfate solution at a temperature of 70° C. for 80 minutes; filter and wash the mixed solution after leaching to obtain the filter residue and ammonium sulfate leaching solution; dry the filter residue above 100° C. dry to obtain phosphorous concentrate;

[0091] (5) passing the carbon dioxide produced by step (1) calcining and the ammonia produced in steps (2) and (4) leac...

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PUM

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Abstract

The invention relates to a method for processing phosphate rock tailings. According to the invention, the phosphate rock tailing pre-treated by sulfuric acid is processed through calcination digestion, then a processing mode with two-step leaching is used, a magnesium element in the phosphate tailing is fully separated, and the phosphate tailing quality is enhanced. Waste liquid and waste gas which are generated in the process are recycled, a treated solvent is reused, a filtrate is subsequently processed while the high-quality phosphate rock is obtained, the obtained calcium and magnesium are effectively recycled, discharge of the waste liquid and the waste gas is avoided, tailings are prevented from accumulating, and therefore, the ecological environment is improved.

Description

technical field [0001] The invention relates to the technical field of phosphate rock processing, in particular to a processing method of phosphate rock tailings. [0002] technical background [0003] my country's phosphate rock reserves are huge, but the grade of the mined phosphate rock is low, the mineral particles are fine, closely embedded, and the associated impurities such as magnesium are relatively high. Traditionally, the phosphate rock after mining needs to be pretreated before the next step of product production, so as to reduce the content of impurities such as magnesium in the phosphate rock, thereby achieving the purpose of purifying the phosphate rock, improving the quality of the phosphate rock, and reducing the subsequent The difficulty and energy consumption of using phosphate rock or wet-process phosphoric acid; At present, the beneficiation of phosphate rock in my country mainly adopts flotation, reverse flotation and other methods, but the content of MgO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/18C01F5/24
Inventor 袁再六
Owner 铜仁市万山区盛和矿业有限责任公司
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