A kind of preparation method of high-purity magnesium saponite

A magnesium saponite, high-purity technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems affecting performance, difficult to remove impurities, impurity of saponite crystals, etc., to improve purity and reduce impurities Formation, the effect of high purity

Active Publication Date: 2020-07-31
ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Magnesium saponite synthesized in a solution containing high concentrations of sodium hydroxide-sodium bicarbonate or sodium carbonate-sodium bicarbonate is prone to impure saponite crystals and contains more impurities, such as magnesium carbonate, magnesium hydroxide and magnesium oxide etc., the content of impurities is generally higher than 10%, and these impurities are difficult to remove, thus affecting its performance

Method used

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  • A kind of preparation method of high-purity magnesium saponite

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Embodiment 1

[0031] A kind of preparation method of high-purity stevensite of the present embodiment, comprises the steps:

[0032] 1) According to silicon in water glass: deionized water: the mol ratio of sodium hydroxide is 1.0: 63.0: 1.0, water glass 288.9g, deionized water 1474g, sodium hydroxide 52.8g are mixed, be mixed with the aqueous solution containing silicon .

[0033] 2) According to the molar ratio of magnesium in the magnesium salt: deionized water being 1:16.7, 256 g of magnesium nitrate hexahydrate and 300 g of deionized water were prepared into an aqueous solution containing magnesium.

[0034] 3) According to the molar ratio of aluminum in aluminum salt: deionized water: sodium hydroxide: sodium bicarbonate: potassium in potassium salt is 1.0: 1481.5: 53.9: 59.5: 20.3, aluminum chloride hexahydrate 7.25g, deionized Mix 800 g of ionized water, 64.7 g of sodium hydroxide, 150 g of sodium bicarbonate, and 45.3 g of potassium chloride to prepare an aluminum-containing aqueo...

Embodiment 2

[0038] A kind of preparation method of high-purity stevensite of the present embodiment, comprises the steps:

[0039] 1) According to silicon in water glass: deionized water: the molar ratio of sodium hydroxide is 1.0: 71.1: 0.90, water glass 277.8g, deionized water 1600g, sodium hydroxide 46.2g are mixed, be mixed with the aqueous solution containing silicon .

[0040] 2) According to the molar ratio of magnesium in the magnesium salt: deionized water is 1:22.2, 203g of magnesium chloride hexahydrate and 400g of deionized water are prepared into an aqueous solution containing magnesium.

[0041] 3) According to the molar ratio of aluminum in aluminum salt: deionized water: sodium hydroxide: sodium bicarbonate: potassium in potassium salt is 1.0: 388.9: 17.5: 19: 9.4, aluminum chloride hexahydrate 24.15g, deionized Mix 700g of ionized water, 70.0g of sodium hydroxide, 160g of sodium bicarbonate, and 70g of potassium chloride to prepare an aluminum-containing aqueous solution...

Embodiment 3

[0045] A kind of preparation method of high-purity stevensite of the present embodiment, comprises the steps:

[0046] 1) According to silicon in water glass: deionized water: the molar ratio of sodium hydroxide is 1.0: 76.9: 0.9, water glass 255.6g, deionized water 1591g, sodium hydroxide 39.6g are mixed, be mixed with the aqueous solution containing silicon .

[0047] 2) According to the magnesium in the magnesium salt: the molar ratio of deionized water is 1: 27.8, 203g of magnesium chloride hexahydrate and 500g of deionized water are prepared into an aqueous solution containing magnesium.

[0048] 3) According to the molar ratio of aluminum in the aluminum salt: deionized water: sodium hydroxide: sodium bicarbonate: potassium in the potassium salt is 1.0: 166.7: 8.6: 10.1: 3.5, 75.0 g of aluminum nitrate nonahydrate, deionized Mix 600 g of water, 68.6 g of sodium hydroxide, 170 g of sodium bicarbonate, and 70.7 g of potassium nitrate to prepare an aluminum-containing aqueou...

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Abstract

The invention discloses a preparation method of high-purity magnesium saponite. The preparation method includes the steps that deionized water, water glass and sodium hydroxide are mixed and preparedinto a silicon-containing water solution; deionized water and magnesium salt are mixed and prepared into a magnesium-containing water solution; deionized water, aluminum salt, potassium salt, sodium hydroxide and sodium bicarbonate are mixed and prepared into an aluminum-containing water solution; under stirring conditions, the magnesium-containing water solution and the aluminum-containing watersolution are mixed firstly, so that mixed liquor is obtained; then the silicon-containing water solution is added into the mixed liquor, so that crystallizing liquor is obtained; the obtained crystallizing liquor is added into a crystallizing kettle for constant-temperature crystallization, then a mixture is cooled to have room temperature, and through centrifuging, washing, drying, smashing and sieving, the magnesium saponite is obtained. Under synergism of ion strength of a strong electrolyte solution, hydroxyl ions and carbonate ions, the alkalinity of the crystallizing liquor and the concentration of non-structure crystal ions are adjusted, the orienteering rate and clustering rate of structure crystal ions are coordinated, forming of a saponite crystal nucleus and crystal nucleus growth conditions are optimized, co-precipitation and after-precipitation are avoided, the purity of crystals is improved, and impurity forming is reduced.

Description

[0001] (1) Technical field [0002] The invention relates to a preparation method of high-purity magnesium saponite. [0003] (2) Background technology [0004] Magnesia saponite is a smectite-like layered silicate mineral with a 2:1 trioctahedral structure. Its structural unit layer is composed of two layers of Si-O tetrahedral sheets sandwiching a layer of Mg-O(OH) octahedral sheets. The ideal chemical formula of sodium magnesium saponite is Na x [Mg 6 (Si 8-x al x )]O 20 (OH) 4 (0.2≤x<1.6). In addition to the common characteristics of clay minerals such as small particle size, large specific surface area, and interlayer ion exchange, magnesium saponite also has high surface acidity and alkalinity, high thermal stability, and strong colloidal properties. It is widely used in medicine and other industries. [0005] Magnesia saponite resources are very scarce, and natural saponite contains high impurities and is difficult to purify, so it is usually synthesized arti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
CPCC01B33/40C01P2002/72C01P2006/80
Inventor 俞卫华周春晖童东绅张彤虞凤英
Owner ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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