Method for recovering phosphorus in phosphate tailings with high magnesium content and preparing magnesium sulfate by adopting indirect sulfuric acid method

A technology of high magnesium phosphorus tailings and sulfuric acid method is applied in the application field of waste recycling, which can solve the problem of high energy consumption and achieve the effects of low energy consumption, simple and easy process, and good economic benefits.

Inactive Publication Date: 2014-07-16
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the Chinese patent database, patents related to the recycling of useful elements in high-magnesium phosphorus tailings include, for example, CN102600965A "A Method for Recovering Phosphorus from High Magnesium Phosphorus Tailings", CN102534253A "Using High Magnesium Phosphorus Tailings to Smelt Reduction to Prepare Metal Magnesium Method", CN102534254A "A Method for Preparing Metal Magnesium Using High Magnesium Phosphorus Tailings as Raw Materials", CN102653408A "A Method for Using High Magnesium Phosphorus Tailings to Produce Light Magnesium Carbonate", CN102674407A "A Method for Using High Magnesium Phosphorus Tailings to Produce Light Magnesium Carbonate" Methods of producing light magnesium oxide from magnesium phosphorus tailings", although these methods have their own characteristics, they all require high-temperature calcination pretreatment and high energy consumption

Method used

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  • Method for recovering phosphorus in phosphate tailings with high magnesium content and preparing magnesium sulfate by adopting indirect sulfuric acid method
  • Method for recovering phosphorus in phosphate tailings with high magnesium content and preparing magnesium sulfate by adopting indirect sulfuric acid method

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Effect test

Embodiment 1

[0032] The indirect sulfuric acid method reclaims the phosphorus in the high-magnesium phosphorus tailings and prepares the method for magnesium sulfate, and it comprises the following steps:

[0033] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 9.01%, MgO14.47%, CaO34.08%, SiO 2 9.39%

[0034] 1) Measure 500mL of industrial hydrochloric acid with a mass fraction of 33% (10.39mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings into the three-necked flask, After adding ore. Turn on the condensed water, start stirring, and reflux at 60°C for 30 minutes to obtain the primary acidolysis filtrate and silicon slag. Filtrate at 60°C, wash the silicon slag three times with 100mL distilled water, and mix the first water washing solution and the first acid hydrolysis filtrate;

[0035] 2) Put the mixture obtained in step 1) in a dry beaker, measure 132mL of 98% s...

Embodiment 2

[0040] The indirect sulfuric acid method reclaims the phosphorus in the high-magnesium phosphorus tailings and prepares the method for magnesium sulfate, and it comprises the following steps:

[0041] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 8.02%, MgO15.76%, CaO35.18%, SiO 2 4.94%

[0042]1) Put 510mL of industrial hydrochloric acid with a mass concentration of 33% (10.39mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, gradually add high-magnesium phosphorus tailings into the three-necked flask, add ore After finishing. Turn on the condensed water, start stirring, and reflux at 40°C for 20 minutes to obtain the primary acidolysis filtrate and silicon slag. Filtrate at 60°C, wash the silicon slag three times with 100mL distilled water, and mix the first water washing solution and the first acid hydrolysis filtrate;

[0043] 2) Put the mixture obtained in step 1) in a dry beaker, measure 160mL of 98...

Embodiment 3

[0048] The indirect sulfuric acid method reclaims the phosphorus in the high-magnesium phosphorus tailings and prepares the method for magnesium sulfate, and it comprises the following steps:

[0049] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.57%, MgO16.38%, CaO34.27%, SiO 2 7.39%

[0050] 1) Measure 490mL of industrial hydrochloric acid with a mass concentration of 34% (10.81mol / L) in a clean three-necked flask, weigh 261.8g of high-magnesium phosphorus tailings powder, and gradually add high-magnesium phosphorus tailings into the three-necked flask, After adding ore. Turn on the condensed water, start stirring, and reflux at 30°C for 40 minutes to obtain the primary acidolysis filtrate and silicon slag. Filtrate at 60°C, wash the silicon slag three times with 100mL distilled water, and mix the first water washing solution and the first acid hydrolysis filtrate;

[0051] 2) Put the mixture obtained in step 1) in a dry beaker, measure 170mL of ...

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Abstract

The invention relates to a method for recovering phosphorus in phosphate tailings with high magnesium content and preparing magnesium sulfate by adopting an indirect sulfuric acid method. The method comprises the following steps: 1) mixing the phosphate tailings with high magnesium content with a hydrochloric acid to react, so as to obtain one-time acidolysis filtrate and silicon slag, carrying out insulated suction filtration and washing to obtain a one-time washing solution; 2) carrying out secondary acidification on obtained one-time acidolysis filtrate and a one-time washing solution by using a sulfuric acid, so as to obtain secondary acidified filtrate and calcium sulfate sediments, aging, carrying out suction filtration and washing; (3) concentrating the obtained secondary acidified filtrate and the one-time washing solution once to obtain one-time concentrated filtrate and one-time concentrated solid, carrying out suction filtration and washing after cooling; 4) concentrating the obtained one-time concentrated filtrate and one-time washing solution for the second time, so as to obtain secondary concentrated filtrate and secondary concentrated solid, carrying out suction filtration and drying after cooling, so as to obtain a magnesium sulfate product; 5) returning the secondary concentrated filtrate to be mixed with the hydrochloric acid, leaching the phosphate tailings with high magnesium content in cycle, and extracting after certain concentration is achieved. The method is short in flow, convenient to operate, and high in recovery rate of magnesium.

Description

technical field [0001] The invention belongs to the application field of waste recycling, and in particular relates to a method for recovering phosphorus in high-magnesium phosphorus tailings by an indirect sulfuric acid method and preparing magnesium sulfate. Background technique [0002] High-magnesium phosphorus tailings mainly come from the tailings slag left after the phosphate rock flotation extracts the concentrate, which belongs to the mining solid waste in the industrial solid waste. Its minerals mainly include dolomite, fluorophosphorite and quartz, and its P 2 o 5 The content is about 4-8.5%, and the MgO content is about 12-18%. [0003] According to statistics, for every ton of phosphorous concentrate produced, 0.44 tons of tailings will be produced, and 7 million tons of phosphorous tailings will be produced every year. At present, most of the phosphorus tailings are piled up in tailings ponds, which not only occupy a large area of ​​land and lose a large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40C01B25/12B09B3/00
Inventor 张华丽潘志权吴汉军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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