Preparation method and application of calcite-rhodochrosite solid solution

Abstract

The invention discloses a method for synthesizing calcite-rhodochrosite mixed crystal solid solution by a precipitation method. The method comprises the steps of obtaining calcite-rhodochrosite mixedcrystal solid solution with high crystallinity and good stability by using an ammonium bicarbonate preparation solution as a base solution and then adding anhydrous calcium nitrate and manganous nitrate in different molar ratios into the ammonium bicarbonate solution. Finally, a proper quantity of calcite-rhodochrosite solid solution is dissolved in three different solutions at the temperature of25 DEG C, and the rules of migration, transformation and enrichment of manganese in the environment are mastered. Compared with calcite-rhodochrosite synthesized through a traditional precipitation method, the calcite-rhodochrosite series solid solution synthesized through the method has the advantages of being low in cost, easy to control, capable of achieving long-term stable storage of manganese in the environment and the like.

Description

technical field

[0001] The invention belongs to the field of environmental protection, safety and technology, and relates to a method for synthesizing a calcite-rhodochrosite mixed crystal solid solution and an application thereof. The method utilizes that manganese ions can replace calcium ions and enter the calcite crystal lattice to form a complete solid solution of calcite-rhodochrosite series. Background technique

[0002] Manganese is a heavy metal element with certain toxicity, and its manganese compounds have certain impacts on the environment and human health. However, manganese is also a trace element required by the human body and a nutrient required by animals and plants. For non-biodegradable manganese, it may lead to the occurrence of various diseases. According to the World Health Organization (2011), the maximum level of manganese in drinking water is 0.05mg / L. High levels of manganese in water may cause problems with the human nervous and respiratory syste...

Examples

Embodiment 1

[0017] At room temperature, under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 50mL 2.00mol / L calcium nitrate and 0mL2 .00mol / L manganese nitrate mixed solution is added to the polyethylene bottle at a speed of 10mL / min, and the reaction is stopped after reaching 10min, and the manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.0 can be obtained. Calcite-rhodochrosite mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50 mL of ultrapure water and once with 50 mL of absolute ethanol, and then dried in a blast oven at 90°C for 24 hours to obtain a highly crystalline calcite solid solution.

Embodiment 2

[0019] At room temperature and under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 40mL 2.00mol / L calcium nitrate and 10mL2 .00mol / L manganese nitrate mixed solution is added to the polyethylene bottle at a speed of 10mL / min, and the reaction is stopped after reaching 10 minutes, and the manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.2 can be obtained. Calcite-rhodochrosite mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50mL ultrapure water and once with 50mL absolute ethanol, and then dried in a blast drying oven at 90°C for 24 hours to obtain a highly crystalline calcite-rhodochrosite solid solution .

[0020] Leaching test: degassed ultrapure water, dissolved at 25°C for 2400h, manganese leaching ...

Embodiment 3

[0024] At room temperature, under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 25mL 2.00mol / L calcium nitrate and 25mL2 Add 0.00mol / L manganese nitrate mixed solution into the polyethylene bottle at a rate of 10mL / min, stop the reaction after reaching 10min, and then the calcite-rhodochrosite with manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.5 can be obtained mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50mL ultrapure water and once with 50mL absolute ethanol, and then dried in a blast drying oven at 90°C for 24 hours to obtain a highly crystalline calcite-rhodochrosite solid solution .

[0025] Leaching test: degassed ultrapure water, dissolved at 25°C for 2400 hours, manganese leaching concent...

technical field

[0001] The invention belongs to the field of environmental protection, safety and technology, and relates to a method for synthesizing a calcite-rhodochrosite mixed crystal solid solution and an application thereof. The method utilizes that manganese ions can replace calcium ions and enter the calcite crystal lattice to form a complete solid solution of calcite-rhodochrosite series. Background technique

[0002] Manganese is a heavy metal element with certain toxicity, and its manganese compounds have certain impacts on the environment and human health. However, manganese is also a trace element required by the human body and a nutrient required by animals and plants. For non-biodegradable manganese, it may lead to the occurrence of various diseases. According to the World Health Organization (2011), the maximum level of manganese in drinking water is 0.05mg / L. High levels of manganese in water may cause problems with the human nervous and respiratory syste...

Examples

Embodiment 1

[0017] At room temperature, under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 50mL 2.00mol / L calcium nitrate and 0mL2 .00mol / L manganese nitrate mixed solution is added to the polyethylene bottle at a speed of 10mL / min, and the reaction is stopped after reaching 10min, and the manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.0 can be obtained. Calcite-rhodochrosite mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50 mL of ultrapure water and once with 50 mL of absolute ethanol, and then dried in a blast oven at 90°C for 24 hours to obtain a highly crystalline calcite solid solution.

Embodiment 2

[0019] At room temperature and under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 40mL 2.00mol / L calcium nitrate and 10mL2 .00mol / L manganese nitrate mixed solution is added to the polyethylene bottle at a speed of 10mL / min, and the reaction is stopped after reaching 10 minutes, and the manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.2 can be obtained. Calcite-rhodochrosite mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50mL ultrapure water and once with 50mL absolute ethanol, and then dried in a blast drying oven at 90°C for 24 hours to obtain a highly crystalline calcite-rhodochrosite solid solution .

[0020] Leaching test: degassed ultrapure water, dissolved at 25°C for 2400h, manganese leaching ...

Embodiment 3

[0024] At room temperature, under the condition of nitrogen protection, take 1000mL 0.5mol / L ammonium bicarbonate solution in a 1000mL polyethylene bottle, place it on a magnetic stirrer and stir at 20°C 700rmp for 3min; then mix 25mL 2.00mol / L calcium nitrate and 25mL2 Add 0.00mol / L manganese nitrate mixed solution into the polyethylene bottle at a rate of 10mL / min, stop the reaction after reaching 10min, and then the calcite-rhodochrosite with manganese nitrate / (calcium nitrate+manganese nitrate) molar ratio of 0.5 can be obtained mixed crystal solid solution. The prepared reactant was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with 50mL ultrapure water and once with 50mL absolute ethanol, and then dried in a blast drying oven at 90°C for 24 hours to obtain a highly crystalline calcite-rhodochrosite solid solution .

[0025] Leaching test: degassed ultrapure water, dissolved at 25°C for 2400 hours, manganese leaching concent...

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