Method for utilizing high-magnesium phosphate tailings to produce magnesium fluoride and by-product calcium carbonate

A technology of high-magnesium phosphorus tailings and magnesium fluoride, applied in the direction of magnesium fluoride, calcium carbonate/strontium/barium, magnesium halide, etc., can solve the problems of polluting the surrounding environment, waste of magnesium resources, and few utilization channels, and achieve technological Simple, low production cost, good economic benefits

Inactive Publication Date: 2013-02-13
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, because the tailings have low phosphorous content and few ways to use them, they are usually treated as waste by enterprises in the way of stockpiling, which not only wastes the magnesium resources in the tailings, but also occupies land an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 7.04%, MgO16.86%, CaO37.48%

[0026] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 980° C. to obtain 61.4 g of calcined white. Calcined white and 700g of water were stirred at 80°C for 40 minutes to obtain a digestive juice. Supplement 800g of water into the digestive juice, and then pass gas with a volume fraction of 35% carbon dioxide into the digestive juice to carry out carbonization reaction at 20°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.7, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain the calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir the reaction at a temperature of 50°C, and the reaction time is 50 minutes. Mg in the reaction solut...

Embodiment 2

[0028] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.00%, MgO18.25%, CaO36.82%

[0029] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 950° C. to obtain 59.8 g of calcined white, and stir the calcined white and 500 g of water at 80° C. for 30 minutes to obtain digestive juice. Add 600g of water to the digestive juice, and then pass gas with 30% carbon dioxide volume fraction into the digestive juice to carry out carbonization reaction at 25°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.9, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir at a temperature of 10°C for a reaction time of 120 minutes, mix Mg in the reaction solution after 2+ , F - The stoi...

Embodiment 3

[0031] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.35%, MgO18.59%, CaO37.01%

[0032] Weigh 100g of magnesium and phosphorus tailings and calcinate at 960°C to obtain 60.5g of calcined white, and stir the calcined white and 430g of water at 85°C for 30 minutes to obtain a digestive solution. Supplement 900g of water into the digestive juice, and then pass gas with a volume fraction of 27% carbon dioxide into the digestive juice to carry out carbonization reaction at 30°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.8, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain the calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir at a temperature of 90°C for a reaction time of 30 minutes, and mix Mg in the reaction solution after ...

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Abstract

The invention discloses a method for utilizing high-magnesium phosphate tailings to produce magnesium fluoride and by-product calcium carbonate. The method comprises the following steps: calcinating the high-magnesium phosphate tailings at high temperature to form calcined dolomite, adding water to the calcined dolomite to perform digestion to obtain digestion solution, supplementing water to the digestion solution and then leading carbon dioxide to perform a carbonization reaction to obtain carbonized liquid, separating bottom phosphate ore sediments of the carbonized liquid after the reaction stops, filtering, and obtaining filtrate which is magnesium bicarbonate aqueous solution, and obtaining a calcium carbonate product after drying a filter cake; adding hydrofluoric acid in the obtained magnesium bicarbonate aqueous solution, filtering after the reaction, washing, and obtaining a magnesium fluoride product after drying the filter cake, The industrial waste high-magnesium phosphate tailings serve as raw materials, waste is turned into wealth, abundant magnesium calcium resources in the high-magnesium phosphate tailings are fully utilized to produce the magnesium fluoride and the by-product calcium carbonate, and the method has the advantages of being simple in process, low in production cost and basically free of three wastes.

Description

technical field [0001] The invention relates to fluoride, in particular to a method for producing magnesium fluoride and by-product calcium carbonate by using waste high-magnesium phosphorus tailings. Background technique [0002] Magnesium fluoride is a colorless crystal or white powder. It is an important inorganic chemical raw material with a wide range of uses. It can be used as a raw material for manufacturing ceramics, glass, and hot-pressed crystals. As a coating agent for pigments, it can also be used to prepare precision components such as various lenses and filter coatings in optical instruments, fluorescent materials in cathode ray screens, etc. [0003] The traditional production method of magnesium fluoride is to use different magnesium salts to react with hydrofluoric acid, mainly including magnesium carbonate method, magnesium oxide method and magnesium sulfate method. Since the purity of magnesium salt directly affects the quality of magnesium fluoride, ...

Claims

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Application Information

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IPC IPC(8): C01F5/28C01F11/18
Inventor 胡厚美刘旭
Owner WENGFU (GRP) CO LTD
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