Method for preparing active magnesium oxide by using reverse flotation of phosphate tailings

A technology of activated magnesium oxide and phosphorus tailings, which is applied in the field of waste resource utilization and functional materials, can solve problems such as environmental pollution, achieve high purity, realize high-value utilization, and fine particle size

Pending Publication Date: 2019-01-22
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve comprehensive problems such as phosphate tailings accumulation and environmental pollution, improve the utilization value of magnesium resources associated with phosphate rock, and the by-product calcium sulfate whiskers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 400g20% hydrochloric acid and add in the there-necked flask, after reaching preset temperature 50 ℃, under stirring condition, slowly add 120 grams of flotation gained phosphorus tailings (P 2 o 5 The content of MgO is 6.8%, the content of MgO is 16.5%, the content of CaO is 30%), after reacting for 1 hour, filter, wash and carry out solid-liquid separation.

[0026] Lime is added to the obtained filtrate to control the pH value to 6.0. After precipitation and filtration, a mixed solution containing magnesium chloride and calcium chloride is obtained, and the filter cake is calcium hydrogen phosphate.

[0027] Put the mixed solution obtained above in an ultrasonic environment, heat it to 70°C, add 25% sulfuric acid solution according to the ratio of calcium chloride to sulfuric acid molar ratio of 1:1, stir and react for 30 minutes, filter and wash, and dry the filter cake Finally, 101 g of calcium sulfate dihydrate whiskers were obtained.

[0028] Heat the filtra...

Embodiment 2

[0031] Get 500g15% hydrochloric acid and add in the there-necked flask, after reaching preset temperature 70 ℃, under stirring condition, slowly add 100 grams of flotation gained phosphorus tailings (P 2 o 5 The content of MgO is 5.6%, the content of MgO is 17.2%, the content of CaO is 31%), after reacting for 2 hours, filter, wash and carry out solid-liquid separation.

[0032] Lime is added to the obtained filtrate to control the pH value to 7.0. After precipitation and filtration, a mixed solution containing magnesium chloride and calcium chloride is obtained, and the filter cake is calcium hydrogen phosphate.

[0033] Put the mixed solution obtained above in an ultrasonic environment, heat to 80°C, add 30% sulfuric acid solution according to the molar ratio of calcium chloride to sulfuric acid of 1:1.2, stir and react for 40 minutes, filter and wash, and dry the filter cake Finally, 110 g of calcium sulfate dihydrate whiskers were obtained.

[0034] Heat the filtrate obt...

Embodiment 3

[0038] Get 450g18% hydrochloric acid and add in the there-necked flask, after reaching preset temperature 70 ℃, under stirring condition, slowly add 120 grams of flotation gained phosphorus tailings (P 2 o 5 The content of MgO is 8.5%, the content of MgO is 15.2%, the content of CaO is 31.1%), after reacting for 2 hours, filter, wash and carry out solid-liquid separation.

[0039] Lime is added to the obtained filtrate to control the pH value to 7.0. After precipitation and filtration, a mixed solution containing magnesium chloride and calcium chloride is obtained, and the filter cake is calcium hydrogen phosphate.

[0040]Place the mixed solution obtained above in an ultrasonic environment, heat to 75°C, add 30% sulfuric acid solution at a molar ratio of calcium chloride to sulfuric acid of 1:1, stir and react for 20 minutes, filter and wash, and dry the filter cake Finally, 109 g of calcium sulfate dihydrate whiskers were obtained.

[0041] Heat the filtrate obtained above...

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Abstract

The invention discloses a method for preparing active magnesium oxide by using reverse flotation of phosphate tailings. The method comprises the following steps: dissolving phosphate ore reverse flotation demagnesium tailings in a hydrochloric acid solution, adding lime to adjust the pH value to 6-7, and filtering to obtain a filtration liquid; adding sulfuric acid to form a precipitate, filtering, washing and drying to obtain a dihydrate calcium sulfate whisker, and adding an oxidant into the filtration liquid; heating to 50-80 DEG C and adjusting pH to 6-7, filtering to obtain an filtrationliquid, adding ammonium carbonate for reaction to obtain basic magnesium carbonate crystals, and calcining to obtain active magnesium oxide powders. The method for preparing active magnesium oxide byusing reverse flotation of phosphate tailings achieves the purpose of comprehensively recycling and utilizing phosphate ore beneficiation tailings, prepares active magnesium oxide while preparing gypsum whiskers, and has the advantages of simple process and low energy consumption.

Description

technical field [0001] The invention relates to a method for preparing active magnesium oxide by using reverse flotation phosphorus tailings, and belongs to the field of waste resource utilization and functional materials. Background technique [0002] Phosphate rock is the main fertilizer needed for global agricultural production—the raw material of phosphate fertilizer, an important guarantee for global food production; it is also a raw material for the production of fine chemical products. More than 90% of the phosphate rock grade in my country is lower than 26%. With the continuous mining and utilization of phosphate rock resources, the development and utilization of low-grade and refractory phosphate rock resources have attracted the attention of many researchers. The content of magnesium, iron and aluminum oxides in most low-grade ores in my country is high. Magnesium is generally in the form of dolomite, and the mass content of MgO in some phosphate rocks reaches 10%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06C01F5/24C01F11/46C01B25/32
CPCC01B25/325C01F5/06C01F5/24C01F11/46
Inventor 李兵谭伟韦莎郑开元江涛邹小丽
Owner 中化重庆涪陵化工有限公司
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