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A method for processing phosphate rock and producing calcium and magnesium

A technology for phosphate rock and digestion treatment, applied in magnesium nitrate, phosphate material treatment, calcium/strontium/barium nitrate, etc., to reduce emissions, increase added value, and reduce accumulation

Active Publication Date: 2018-09-07
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 reports in the literature on the method of obtaining high-grade phosphate rock by combined leaching with nitric acid and ammonium nitrate, and producing calcium and magnesium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for processing phosphate rock and producing calcium and magnesium, comprising the following steps:

[0046] (1) Calcining the mined phosphate rock at 1000°C for 1.5h, and then digesting it with 80°C hot water, the amount of hot water is 400ml of water per 1kg of phosphate rock;

[0047] (2) Add 30% ammonium nitrate solution and 50% nitric acid solution to the phosphate rock that has been digested, and stir and leach for 90 minutes at a temperature of 60°C; , the amount of nitric acid solution added is 120g per 1kg of phosphate rock;

[0048] (3) filtering and washing the leached slurry in step 2) to obtain leaching residue and leaching liquid;

[0049] (4) Stir and leach the leach residue with 20% ammonium sulfate solution at a temperature of 80° C. for 90 minutes; 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 high-grade phosphate rock; the dos...

Embodiment 2

[0055] A method for processing phosphate rock and producing calcium and magnesium, comprising the following steps:

[0056] (1) Calcining the mined phosphate rock at 1100° C. for 1.0 h, and then digesting it with hot water at 70° C. The amount of hot water is 500 ml of water per 1 kg of phosphate rock;

[0057] (2) Add 40% ammonium nitrate solution and 60% nitric acid solution to the phosphate rock that has been digested, and stir and leach for 90 minutes at a temperature of 70°C; , the amount of nitric acid solution added is 100g per 1kg of phosphate rock;

[0058] (3) filtering and washing the leached slurry in step 2) to obtain leaching residue and leaching liquid;

[0059] (4) Stir and leach the leach residue with 30% ammonium sulfate solution at a temperature of 75° C. for 60 min; filter and wash the leached mixed solution to obtain the filter residue and ammonium sulfate leach solution; dry the filter residue above 100° C. Dry to obtain high-grade phosphate rock; the d...

Embodiment 3

[0065] A method for processing phosphate rock and producing calcium and magnesium, comprising the following steps:

[0066] (1) Calcining the mined phosphate rock at 1200°C for 0.5h, and then digesting it with hot water at 60°C, the amount of hot water is 600ml of water per 1kg of phosphate rock;

[0067] (2) Add 50% ammonium nitrate solution and 75% nitric acid solution to the phosphate rock that has been digested, and stir and leach for 60 minutes at a temperature of 80°C; , the amount of nitric acid solution added is 110g per 1kg of phosphate rock;

[0068] (3) filtering and washing the leached slurry in step 2) to obtain leaching residue and leaching liquid;

[0069] (4) Stir and leach the leach residue with 20-40% ammonium sulfate solution at a temperature of 70-80° C. for 60-90 min; filter and wash the leached mixed solution to obtain filter residue and ammonium sulfate leaching solution; filter residue Dry above 100°C to obtain high-grade phosphate rock; the dosage of...

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PUM

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Abstract

The invention relates to a method for phosphorite processing and calcium and magnesium production. According to the method, mined phosphorite is subjected to calcinations, and slaking is performed, and then, magnesium is thoroughly separated from crude phosphorite by using a two-step-leaching treatment mode, so that the loss of phosphorus pentoxide is effectively avoided while the quality of the phosphorite is improved; waste liquid and exhaust gas resulted from a process are recovered, and a treated solvent is regenerated; in addition, calcium and magnesium products are prepared from a filtrate obtained after high-quality phosphorite is obtained, so that calcium and magnesium are effectively recycled, the emission of the waste liquid and the exhaust gas and the accumulation of tailings are avoided, and the improvement on ecological environment is facilitated.

Description

technical field [0001] The invention relates to the technical field of phosphate rock processing, in particular to a method for processing phosphate rock and producing calcium and magnesium. technical background [0002] 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, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/01C01C1/26C01F11/42C01F5/38
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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