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New method for producing fluoride and white carbon black by adopting fluosilicic acid or fluosilicate

A fluorosilicate and fluoride technology, applied in the field of co-production of white carbon black, can solve the problems of inability to recover fluorosilicate, low processing efficiency and high cost of raw materials, and achieve easy control of operating conditions, low reaction temperature, and low reaction temperature. short time effect

Inactive Publication Date: 2014-08-13
SUZHOU HENGRUI BIO PHARMA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A commonly used treatment method is calcium hydroxide or calcium salt precipitation method, but the treatment efficiency is low, and the generated sludge has no reuse value and can only be discarded
The coagulation sedimentation method and the adsorption method have high raw material costs, and can only treat wastewater with a small amount and low fluorine content, and cannot recycle fluorine-containing wastewater
Fluorine-containing wastewater produced by integrated circuit manufacturing plants can be used to produce cryolite, but this method is only suitable for the treatment of hydrofluoric acid, and cannot recover fluorosilicate in other fluorine-containing wastewater

Method used

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  • New method for producing fluoride and white carbon black by adopting fluosilicic acid or fluosilicate
  • New method for producing fluoride and white carbon black by adopting fluosilicic acid or fluosilicate
  • New method for producing fluoride and white carbon black by adopting fluosilicic acid or fluosilicate

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: with K 2 SiF 6 and KOH to prepare KF and SiO 2 .

[0029] 1. Add 6.6kg potassium fluorosilicate, 6.7kg KOH, 110kg water and 0.01kg SiO to the reactor 2 .

[0030] 2. Start stirring to make the reaction mixture react under stirring to generate potassium fluoride and SiO 2 .

[0031] 3. Turn on the constant temperature control device and set the temperature inside the reactor to a constant temperature of 40 °C.

[0032] 4. Measure the fluoride ion content of the solution in the reaction kettle, and turn off the stirring device when the reaction end point is reached.

[0033] 5. Centrifuge the solution and precipitate in the reactor, the solution is potassium fluoride, and the precipitate is SiO 2 .

[0034] 6. Concentrate the crystalline potassium fluoride solution to obtain KF.

[0035] 7. SiO 2 After washing, it is placed in a drying box and dried to obtain white carbon black.

[0036] The potassium fluoride and silicon dioxide products prepared...

Embodiment 2

[0039] Embodiment 2: Treat fluorine-containing waste water with KOH, prepare KF and SiO 2 .

[0040] 1. It has been determined that the fluorine-containing wastewater contains 7.7kg hydrogen fluoride and 9.6kg fluosilicic acid per 100kg.

[0041] 2. Add 100kg of fluorine-containing wastewater, 44kg of KOH and 0.02kg of SiO to the reactor 2 .

[0042] 3. Start stirring to make the reaction mixture react under stirring to generate potassium fluoride and SiO 2 .

[0043] 4. Turn on the thermostatic control device to control the temperature in the reactor to 40 °C.

[0044] 5. Measure the fluoride ion content of the solution in the reaction kettle, and turn off the stirring device when the reaction end point is reached.

[0045] 6. Centrifuge the solution and precipitate in the reactor, the solution is potassium fluoride solution, and the precipitate is SiO 2 .

[0046] 7. Concentrate the crystalline potassium fluoride solution to obtain KF.

[0047] 8. SiO 2 After washin...

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Abstract

The invention discloses a new process for producing fluoride and a white carbon black coproduct by adopting fluosilicic acid or fluosilicate. A method for adding SiO2 particles in a process of hydrolyzing fluosilicate for promoting generation of SiO2 crystal nucleus reaction product is adopted, reaction temperature is reduced, reaction efficiency is improved, and a hydrolysis process is more complete. The new method for producing fluoride and white carbon black by adopting fluosilicic acid or fluosilicate provides an effective way for recycling of fluoride-containing waste water.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a kind of exogenous SiO 2 A method for preparing fluoride and co-producing white carbon black with fluorosilicic acid or fluorosilicate under the action of crystal seeds. Background technique [0002] Fluorosilicate hydrolysis can produce fluoride and silica. The reaction formula is: [0003] SiF 6 2- +4OH - →6F - + SiO 2 +4H 2 o [0004] Then through the method of solid-liquid separation, fluoride and white carbon black products can be obtained. The principle of this method is simple but the operating conditions are not easy to control. For example, the hydrolysis temperature of potassium fluorosilicate under alkaline conditions needs to be 85~95°C, and the hydrolysis time is longer. The present invention is by adding SiO in the fluorosilicate hydrolysis process 2 The seed crystal can reduce the hydrolysis temperature, shorten the hydrolysis time, promote ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01B33/10
Inventor 何菲吴魁旺邓强
Owner SUZHOU HENGRUI BIO PHARMA TECH
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