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Method using magnalium hydrotalcite to carry out deep desilication on sodium aluminate solution containing silicon

A technology of magnesium aluminum hydrotalcite and sodium aluminate, applied in chemical instruments and methods, alumina/aluminum hydroxide, aluminum compounds, etc., can solve problems such as biological environmental pollution, polluted offshore seawater, and difficult treatment of bauxite. Achieve the effect of improving the environment, reducing production costs, and reducing costs

Inactive Publication Date: 2014-05-21
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, bauxite containing large amounts of silica is difficult to process
The presence of silica in bauxite causes at least two problems when digesting bauxite: (i) dissolution and reprecipitation of silica as a complex sodium silicate, thereby consuming caustic soda; (ii) complex Re-precipitation of sodium aluminosilicate on unit surfaces causes fouling buildup, which is particularly problematic when fouling builds up on heat exchange surfaces
In industry, these brines are usually discharged into the sea or salt lakes. At present, only a small part of them are used to prepare solid crystalline magnesium chloride as a basic inorganic chemical raw material. A large amount of brine is discharged back, which not only pollutes offshore seawater, but also pollutes offshore wetlands. certain impacts, so that some organisms are in danger of extinction due to environmental pollution

Method used

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  • Method using magnalium hydrotalcite to carry out deep desilication on sodium aluminate solution containing silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Naturally evaporate, concentrate, and crystallize the brine, filter to remove impurities and crystals, obtain refined brine containing magnesium chloride, and adjust it with water to make the concentration of magnesium chloride 0.5mol / L, and add a certain amount of aluminum chloride at the same time, Make Mg2+ with Al 3+ The molar ratio is 3, dubbed salt solution A.

[0034] (2) Dissolve sodium hydroxide in water to make its concentration 1mol / L, add a certain amount of sodium carbonate at the same time, and make the molar ratio NaOH / (NaOH+Na 2 CO 3 ) is 0.8,, dubbed alkaline solution B.

[0035] (3) 300ml of solution B prepared in step (2) is added in the reaction tank with jacket, in the jacket of the reaction tank with jacket, pass into circulating oil bath, the temperature of solution B is adjusted to 30 ℃, under the stirring speed of 200rpm, 300ml of solution A prepared in step (1) is added in the reaction tank, the control reaction temperature is 30 ℃, the ...

Embodiment 2

[0043] Add the dry magnesium aluminum hydrotalcite obtained in Example 1 into the silicon-containing sodium aluminate solution, wherein the magnesium aluminum hydrotalcite is added in an amount of 50 g / L; the desiliconization temperature is 130°C for 600 minutes ; approximately 81% SiO in a silicon-containing sodium aluminate solution 2 Removed from the silicon-containing sodium aluminate solution, the silicon content index of the desiliconized sodium aluminate solution is about 105;

[0044] The composition of described silicon-containing sodium aluminate solution:

[0045] Calculated by NaOH, the concentration of caustic soda is 500g / L;

[0046] Press Al 2 o 3 The concentration of alumina is 200g / L;

[0047] by SiO 2 Calculated, the concentration of silicon is 10g / L.

Embodiment 3

[0049] (1) Naturally evaporate, concentrate, and crystallize the brine, filter to remove impurities and crystals, obtain refined brine containing magnesium chloride, and adjust it with water to make the concentration of magnesium chloride 0.5mol / L, and add a certain amount of aluminum chloride at the same time, Make Mg 2+ with Al 3+ The molar ratio is 3, dubbed salt solution A.

[0050] (2) Dissolve sodium hydroxide in water to make its concentration 1mol / L, add a certain amount of sodium carbonate at the same time, and make the molar ratio NaOH / (NaOH+Na 2 CO 3 ) is 0.8,, dubbed alkaline solution B.

[0051] (3) 300ml of solution B prepared in the step (2) is added in the reaction tank with jacket, and the circulating oil bath is passed into the jacket of the reaction tank with jacket, and the temperature of solution B is adjusted to 80 ℃, under the stirring speed of 200rpm, 300ml of solution A prepared in step (1) is added in the reaction tank, the control reaction temper...

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Abstract

The invention discloses a method used for deep desilication of a sodium aluminate solution containing silicon. According to the invention, brine containing magnesium chloride is used as a raw material to prepare magnalium hydrotalcite (Mg6Al2 (OH) 16CO3.4H2O), and the magnalium hydrotalcite is used as a desilication agent to carry out deep desilication on the sodium aluminate solution containing the silicon; and at least 80% of silicon dioxide can be removed from the sodium aluminate solution containing the silicon; rich seawater or salt lake brine calcium chloride resources are used to prepare the magnalium hydrotalcite; the magnalium hydrotalcite is used to carry out deep desilication on the sodium aluminate solution containing the silicon in the alumina industry; waste resources are recycled; the environment pollution is reduced; the alumina production cost is reduced; and the economic efficiency of an enterprise is improved.

Description

technical field [0001] The invention belongs to a method for desiliconizing a silicon-containing sodium aluminate solution, in particular to preparing magnesium-aluminum hydrotalcite by using brine containing magnesium chloride as a raw material, and using it as a desiliconizing agent to carry out deep desiliconization of a silicon-containing sodium aluminate solution Methods. Background technique [0002] my country's bauxite reserves are abundant, but more than 80% of them are aluminum-silicon ratios (Al in bauxite 2 o 3 and SiO 2 The mass ratio of the diaspore type bauxite of middle and low grades of 4 to 8 cannot be directly applied to the Bayer process with low production cost. The Bayer process produces alumina. [0003] Bauxite contains impurities such as silicon, iron and titanium in addition to the hydrated form of alumina. The iron and titanium present in bauxite are generally insoluble in caustic soda solution and have little effect on the selective extractio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/00
Inventor 马家玉
Owner GUIYANG AL-MG DESIGN & RES INST
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