Preparation method of magnesium-based hydrotalcite
A technology of magnesium-based hydrotalcite and magnesium ions, applied in hydrotalcite, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as unstable batch product quality, and achieve continuous equipment, concentration and supersaturation distribution uniform effect
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[0032] The preparation method for continuous preparation of magnesium-based hydrotalcite provided by the embodiment of the present invention includes the following steps:
[0033] Step A: making the magnesium-containing feed solution and the first metal salt into a mixed metal salt solution, the metal cations in the mixed metal salt solution include magnesium ions and N-valent metal ions, and N is +3 or +4.
[0034] Further, step A may also include making the second metal salt together with the magnesium salt and the first metal salt into a mixed metal salt solution, and the metal cations in the mixed metal salt solution also include Divalent metal ions other than magnesium ions.
[0035] The above-mentioned magnesium-containing feed liquid includes a solution after dissolving magnesium salt or various magnesium-containing brines. For example: magnesium-containing feed liquid after purification of salt lake brine (including operations such as lithium extraction, boron extract...
Embodiment 1
[0058] (1) Preparation of mixed metal salt solution: weigh MgCl 2 ·6H 2 O 40.6g and AlCl 3 13.3 g, dissolved in 1 L of deionized water to obtain a clear mixed metal salt solution.
[0059] (2) Preparation of alkaline solution: weigh 24g of NaOH and NaCO 3 28.8 g was dissolved in 1 L of deionized water to obtain a clear alkaline solution.
[0060] (3) Pour the mixed metal salt solution and alkaline solution into the supergravity reactor at a rate of 50mL / min, set the speed of the supergravity reactor to 3000rpm, and the temperature to 80°C.
[0061](4) The white precipitate obtained in the high-gravity reactor was centrifuged, washed three times with deionized water, and then dried in an oven at 70° C. to obtain a white powder.
[0062] figure 1 The X-ray diffraction spectrum (XRD pattern for short) of the obtained white powder shows that the white powder has the characteristic diffraction peaks of standard MgAl-LDHs.
Embodiment 2
[0064] (1) Preparation of mixed metal salt solution: Weigh 3.5g of sodium dodecyl sulfate (SDS) and dissolve it in 1.5L deionized water. After the dissolution is complete, add MgCl 2 ·6H 2 O 40.6g and AlCl 3 24 g, a clear mixed metal salt solution was obtained.
[0065] (2) Preparation of alkaline solution: weigh 24g of NaOH and NaCO 3 10 g was dissolved in 1.5 L of deionized water to obtain a clear alkaline solution.
[0066] (3) Pour the mixed metal salt solution and alkaline solution into the supergravity reactor at a rate of 50mL / min, set the speed of the supergravity reactor to 3000rpm, and set the temperature to 50°C.
[0067] (4) The white precipitate obtained in the high-gravity reactor was centrifuged, washed three times with deionized water, and then dried in an oven at 70° C. to obtain a white powder.
[0068] figure 2 The X-ray diffraction spectrum (XRD pattern for short) of the obtained white powder shows that the white powder has the characteristic diffra...
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