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Crystallization method for aluminum fluoride production

A technology of aluminum fluoride and aluminum fluoride water, which is applied in the preparation and application of fine chemicals, can solve problems such as poor crystallization effect and poor filtration effect, and achieve the goals of lowering temperature, increasing crystallization effect, and improving work efficiency Effect

Pending Publication Date: 2022-02-08
云南云天化氟化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing crystallization method has poor filtering effect, resulting in poor crystallization effect

Method used

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  • Crystallization method for aluminum fluoride production
  • Crystallization method for aluminum fluoride production
  • Crystallization method for aluminum fluoride production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A crystallization method for aluminum fluoride production, comprising the steps of:

[0046] S1, react the fluosilicic acid and aluminum hydroxide placed in the anticorrosion storage tank to generate aluminum fluoride-silica gel slurry;

[0047] S2. Send the generated aluminum fluoride-silica gel slurry to the belt filter through the filter pump, and separate the aluminum fluoride supersaturated solution from the silica gel under the negative pressure of the vacuum pump; the aluminum fluoride supersaturated solution enters the crystallization tank The crystallization of aluminum fluoride trihydrate is generated, and the silica gel enters the synthesis tank of silica gel containing cryolite;

[0048] S3. Put the supersaturated solution of aluminum fluoride filtered by silica gel into the crystallization tank with steam at 90°C and keep it for 4-6 hours to generate aluminum fluoride trihydrate crystals;

[0049] S4. The solid-liquid mixture after crystallization is place...

Embodiment 2

[0051] On the basis of Embodiment 1, the anticorrosion storage tank is a plastic storage tank 36, and the plastic storage tank 36 is a hollow body with a liquid inlet pipe 37 on the top and a liquid outlet pipe 38 on the bottom, and the liquid inlet pipe 37 and the liquid outlet pipe 38 is provided with a valve, the cavity of the plastic storage tank 36 is provided with an annular partition 39 to separate the cavity into a cooling zone 40 and a storage zone 41, cooling liquid is provided in the cooling zone 40, and the top of the cooling zone 40 is provided with The cooling liquid inlet pipe 42, the bottom is provided with the cooling liquid outlet pipe 43, the cooling liquid inlet pipe 42 and the cooling liquid outlet pipe 43 are provided with valves, when storing the fluorosilicic acid solution, in the cooling zone 40, a Cooling the solution can reduce the temperature of the fluorosilicic acid solution.

[0052] Example 2

[0053] On the basis of Embodiment 1, the side wall...

Embodiment 3

[0055] On the basis of Embodiment 1, the outer wall of the plastic storage tank 36 is wrapped with a first reinforced outer wall 45, and a reinforcing rib is arranged between the first reinforced outer wall 45 and the outer wall 36 of the storage tank; the outer wall of the first reinforced 45 is provided with anti-collision A buffer spring 47 is arranged between the plate 46 and the anti-collision plate 46 and the first reinforced outer wall 45, which can protect the plastic storage tank.

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Abstract

The invention belongs to the technical field of clean production, and particularly relates to a crystallization method for aluminum fluoride production. The method comprises the steps of S1, reacting fluosilicic acid and aluminum hydroxide in an anti-corrosion storage tank to generate aluminum fluoride-silica gel slurry; S2, conveying the generated aluminum fluoride-silica gel slurry to a belt filter through a filter pump, and separating an aluminum fluoride supersaturated solution from silica gel under the action of negative pressure pumping of a vacuum pump, wherein the aluminum fluoride supersaturated solution enters a crystallization tank to generate aluminum fluoride trihydrate crystals, and silica gel enters a cryolite-containing silica gel synthesis tank; S3, introducing 90 DEG C steam into the aluminum fluoride supersaturated solution filtered by the silica gel in the crystallization tank, and keeping for 4-6 hours to generate aluminum fluoride trihydrate crystals; and S4, putting the crystallized solid-liquid mixture on a tilting-pan filter, separating aluminum fluoride crystals from mother liquor under the negative pressure pumping action of the vacuum pump to obtain ointment, enabling the mother liquor to flow into a settling tank for settling, treating waste gas by using supernate, retaining precipitate crystals, scattering the crystallized ointment to enter, and drying a first-section semi-finished product of aluminum fluoride. The crystallization effect is good.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of fine chemicals, and in particular relates to a crystallization method for aluminum fluoride production. Background technique [0002] Aluminum fluoride is neutralized with fluorosilicic acid solution and aluminum hydroxide to produce aluminum fluoride solution, after crystallization and one-stage drying to obtain aluminum fluoride semi-finished products, and then after two-stage drying to remove most of the crystal water to obtain aluminum fluoride finished products; After one-stage drying and two-stage drying, the tail gas is treated and then emptied. [0003] The specific steps are: solution leaching: leaching aluminum hydroxide and fluorosilicic acid in a leaching tank to obtain a mixed slurry of aluminum fluoride solution and silica gel. Its chemical reaction is: [0004] h 2 SiF 6 +2Al(OH) 3 =2ALF3+SiO2 2 +4H 2 O; [0005] Then, the mixed slurry of aluminum flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02B01D33/19C01F7/50
CPCB01D9/0004B01D33/19C01F7/50
Inventor 陈树林尹华明余科何林
Owner 云南云天化氟化学有限公司
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