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Fluorine-removing water purifier and preparation method thereof

A fluorine water purifier and roasting technology, applied in the field of environmental chemistry, can solve the problems of poor fluorine removal effect and low solubility, and achieve the effects of low cost, mild conditions and high industrial value

Active Publication Date: 2017-11-10
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent with the application number CN101597103A discloses a method for preparing a defluoridation agent, which is a product obtained by mixing, drying, calcining, and pulverizing magnesium oxide, magnesium carbonate, and magnesium hydroxide. In essence, the active ingredient for defluoridation is magnesium oxide or Magnesium hydroxide, but the solubility of the two in water is small, and the effect of removing fluoride is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition of the fluorine-removing water purifier of the present embodiment according to the mass percentage is: Mg(OH) 2 , 9.1%, MgCO 3 , 65.9%, Al(OH) 3 , 25%.

[0034] The preparation method comprises the following steps:

[0035] (1) Get 1kg of sodium carbonate, and the particle size is 0.7kg of -200 mesh bauxite powder, wherein the alumina content in bauxite is 38%, the two are mixed, roasted in a muffle furnace for 1h, and the roasting temperature is 1100 ℃;

[0036] (2) Filtrate after fully dissolving the roasted mixed material with water, and retain the filtrate;

[0037] (3) Magnesium chloride hexahydrate 1.9kg is mixed with the solution that concentration is 4mol / L, after mixing with described filtrate, stir reaction 1h with the stirring velocity of 300rpm at normal temperature, filter out filter cake after reaction finishes, filter cake is washed and Drying, the drying temperature is 105°C, to obtain the fluorine-removing water purifying a...

Embodiment 2

[0040] The chemical composition of the fluorine-removing water purifier of the present embodiment according to the mass percentage is: Mg(OH) 2 , 14.5%, MgCO 3 , 46.5%, Al(OH) 3 , 39%

[0041] The preparation method comprises the following steps:

[0042] (1) Get 1 kg of sodium carbonate, 1.5 kg of fly ash powder with a particle size of -200 mesh, wherein the alumina content in the fly ash is 25%, mix the two, and roast in a muffle furnace for 3 hours at a roasting temperature of 800 ℃;

[0043](2) Filtrate after fully dissolving the roasted mixed material with water, and retain the filtrate;

[0044] (3) Magnesium sulfate heptahydrate 2.7kg is mixed with the solution that concentration is 1mol / L, after mixing with described filtrate, stir reaction 1.5h with the stirring speed of 180rpm at normal temperature, filter out filter cake after reaction finishes, filter cake After washing and drying, the drying temperature is 105° C. to obtain a fluorine-removing water purifying...

Embodiment 3

[0047] The chemical composition of the fluorine-removing water purifier of the present embodiment according to the mass percentage is: MgfOH) 2 , 15%, MgCO 3 , 44.1%, Al(OH) 3 , 40.9%

[0048] The preparation method comprises the following steps:

[0049] (1) Get 1 kg of sodium carbonate, 2.5 kg of coal gangue powder with a particle size of -200 mesh, wherein the alumina content in the coal gangue is 17%, mix the two, and roast in a muffle furnace for 2 hours at a roasting temperature of 900° C.;

[0050] (2) Filtrate after fully dissolving the roasted mixed material with water, and retain the filtrate;

[0051] (3) Magnesium nitrate hexahydrate 2.3kg is mixed with the solution that concentration is 2.5mol / L, after mixing with described filtrate, stir reaction 0.5h with the stirring speed of 600rpm at normal temperature, filter out filter cake after reaction finishes, filter The cake was washed and dried at a temperature of 105° C. to obtain a fluorine-removing water purif...

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PUM

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Abstract

The invention provides a fluorine-removing water purifier and a preparation method thereof. The fluorine-removing water purifier is prepared from chemical components in percentage by mass as follows: 15%-29% of Mg(OH), 44%-66% of MgCO3, 25%-41% of Al(OH)3 in the mass ratio being 1:(2.9-7.3):2.7. The preparation method comprises the steps as follows: sodium carbonate and aluminum mineral are mixed and roasted; a roasted mixed material is fully dissolved in water and then filtered; a magnesium salt solution and filtrate are mixed to react, filtration is performed after the reaction, a filter cake is washed and dried, and thus the fluorine-removing water purifier is obtained. An application method comprises the steps as follows: 3-6 g of the fluorine-removing water purifier is added in each gram of F in to-be-processed fluorine-containing wastewater and stirred at the normal temperature to react for 1.5-4 h. The consumption of the fluorine-removing water purifier is low for removal of fluorine in fluorine-containing wastewater, the fluorine-removing capacity is high, and residual fluorine in fluorine-removed wastewater reaches the GB8978-1996 first-class emission standard.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, and in particular relates to a fluoride-removing water purifier and a preparation method thereof. Background technique [0002] Fluorine-containing wastewater mainly comes from various industries such as quartz mineral processing, etching processing of silicon-containing materials, electroplating, and chemical fertilizers. Wastewater with high fluoride concentration poses a great threat to the ecological environment and human health. Excessive intake of fluorine can lead to dental fluorosis, skeletal fluorosis and metabolic disorders. According to GB8978-1996 sewage discharge standard, the first-level standard of fluorine discharge concentration is not higher than 10mg / L, otherwise, it needs to be defluoridated before it can be discharged after reaching the standard. [0003] At present, wastewater defluorination processes include chemical precipitation, ion exchange, membrane se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/001C02F1/28C02F1/66C02F2101/14
Inventor 董庆国李强张旭刘宏梅
Owner LIAONING TECHNICAL UNIVERSITY