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Method for preparing ammonium magnesium phosphate and CaCO3 from phosphate tailings and recycling byproducts (NH4) 2SO4 and CO2

A magnesium ammonium phosphate and 2SO4 technology, which is applied in the field of waste resource utilization, can solve the problems of low added value of products and low utilization rate of phosphorus tailings, and achieve the effect of reducing energy consumption and cost

Pending Publication Date: 2020-08-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a kind of phosphorus tailings preparation magnesium ammonium phosphate and CaCO 3 and recycle by-products (NH 4 ) 2 SO 4 and CO 2 method to solve the problems of low resource utilization rate of existing phosphorus tailings and low added value of products

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  • Method for preparing ammonium magnesium phosphate and CaCO3 from phosphate tailings and recycling byproducts (NH4) 2SO4 and CO2

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Experimental program
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Effect test

Embodiment 1

[0032] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 6.24%, MgO: 13.8%, CaO: 31.91%, SiO 2 : 7.75%.

[0033] combine figure 1 Shown, the phosphorous tailings of present embodiment prepare magnesium ammonium phosphate and CaCO 3 and recycle by-products (NH 4 ) 2 SO 4 and CO 2 method, specifically including the following steps:

[0034] 1) Measure 232mL tap water and 232mL of mass fraction respectively and be 35% industrial hydrochloric acid (9.98mol / L) to be placed in the same clean three-necked flask, according to the mole of calcium and magnesium in industrial hydrochloric acid and high-magnesium phosphorus tailings 2.54:1 Take 100g of high-magnesium phosphorus tailings, gradually add high-magnesium phosphorus tailings into the three-necked flask, and simultaneously put the produced CO 2 Introduce the gas into the carbonization reactor in step 4), stir at 50°C, and after acidolysis for 30 minutes, heat-preserve and filter to obtai...

Embodiment 2

[0040] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 7.35%, MgO: 11.8%, CaO: 33.22%, SiO 2 : 8.67%.

[0041] to combine figure 1 Shown, the phosphorous tailings of present embodiment prepare magnesium ammonium phosphate and CaCO 3 and recycle by-products (NH 4 ) 2 SO 4 and CO 2 method, specifically including the following steps:

[0042] 1) Measure 200mL tap water and 232mL mass fraction respectively and be 35% industrial hydrochloric acid (9.98mol / L) to be placed in the same clean three-necked flask, according to the mole of calcium and magnesium in industrial hydrochloric acid and high-magnesium phosphorus tailings 2.9:1 Take 90g of high-magnesium phosphorus tailings, gradually add high-magnesium phosphorus tailings into the three-necked flask, and simultaneously remove the produced CO 2 Introduce the gas into the carbonization reactor in step 4), stir at 60°C, and after acidolysis for 30 minutes, heat-preserve and filter to obta...

Embodiment 3

[0048] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 9.5%, MgO: 14.5%, CaO: 38.26%, SiO 2 : 7.35%.

[0049] to combine figure 1 Shown, the phosphorous tailings of present embodiment prepare magnesium ammonium phosphate and CaCO 3 and recycle by-products (NH 4 ) 2 SO 4 and CO 2 method, specifically including the following steps:

[0050] 1) Measure 150mL of tap water and 232mL of mass fraction respectively and be 35% industrial hydrochloric acid (9.98mol / L) to be placed in the same clean three-necked flask. Take 65g of high-magnesium phosphorus tailings, gradually add high-magnesium phosphorus tailings into the three-necked flask, and simultaneously 2 Introduce the gas into the carbonization reactor in step 4), stir at 70°C, and after acidolysis for 30 minutes, heat-preserve and filter to obtain the acidolysis solution and silicon slag, and measure 80 mL according to the mass ratio of the total mass of washing water to the silicon s...

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Abstract

The invention provides a method for preparing ammonium magnesium phosphate and CaCO3 from phosphate tailings and recycling byproducts (NH4) 2SO4 and CO2. The method comprises the following steps: performing acidolysis on the phosphate tailings; then, mixing a mixed acidolysis solution obtained by acidolysis with an ammonium sulfate solution; performing calcium separation reactions, and obtaining calcium sulfate and calcium precipitation mother liquor, wherein calcium sulfate and ammonia water are prepared into calcium sulfate slurry, CO2 generated by acidolysis reaction is introduced for carbonization reaction to obtain calcium carbonate and an ammonium sulfate solution, and the obtained ammonium sulfate solution can be circularly added into the mixed acidolysis solution for cyclic calciumprecipitation reaction; and finally, neutralizing the calcium precipitation mother solution by ammonia water and subjecting to phosphorus precipitation reaction to obtain ammonium magnesium phosphate. According to the invention, valuable elements in the high-magnesium phosphate tailings can be effectively utilized, wherein the recovery rates of calcium and phosphorus elements in the phosphate tailings reach 95% or above, the contents of effective components P2O5, MgO and total nitrogen in ammonium magnesium phosphate can reach 28%, 18% and 9% or above respectively, the purity of calcium carbonate reaches 97% or above, and the quality meets the qualified product requirements in the standard HG2226-91.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for preparing magnesium ammonium phosphate and CaCO from phosphorous tailings. 3 and recycle by-products (NH 4 ) 2 SO 4 and CO 2 Methods. Background technique [0002] my country is rich in phosphate rock resources, but after long-term mining, it gradually tends to be depleted, and the high-grade phosphate rock is significantly reduced, and most of the low-grade phosphate rocks are mainly mined. At present, my country mainly adopts the method of chemical flotation to enrich low-grade phosphate ore, but the chemical flotation process inevitably produces a large amount of chemical flotation tailings. At present, this part of tailings is mainly discarded as waste or stored in tailings ponds. A large number of tailings have been stored in tailings ponds for a long time. With the erosion of rainwater, the tailings are corroded, and some associated mob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01F11/18C01C1/24C01B32/50
CPCC01B25/451C01F11/181C01F11/182C01C1/24C01B32/50C01P2006/80
Inventor 吴汉军潘志权张华丽潘洁
Owner WUHAN INSTITUTE OF TECHNOLOGY
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