A method for preparing sodium fluorosilicate from fluorine-containing silicon slag

A technology of fluorine-containing silicon slag and sodium fluorosilicate, which is applied in the direction of silicon halide compounds, can solve problems such as complicated process steps, harsh preparation conditions, and poor product quality, and achieves reduced free acid content, shortened reaction time, and good The effect of quality assurance

Active Publication Date: 2017-08-08
GUIZHOU YUANSHENG POTASSIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the existing production technology of sodium fluorosilicate, there are many auxiliary reagents, a large amount of industrial wastewater is produced, the process steps are complicated, and the preparation conditions are harsh.
For example, the patent number discloses that albite is treated and decomposed to obtain fluorine-containing gas, then hydrolyzed and acid leached to obtain acid leaching solution, mixed with sodium sulfate for crystallization, separated and dried by gravity sedimentation technology, and fluorine is obtained. Sodium silicate products, this method has low cost and little pollution, but the product quality is poor and performance is low

Method used

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  • A method for preparing sodium fluorosilicate from fluorine-containing silicon slag

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Embodiment 1

[0024] A method for preparing sodium fluorosilicate from fluorine-containing silicon slag, comprising the following steps:

[0025] (1) Mix and stir the fluorine-containing silicon slag and sodium hydroxide with a concentration of 28%, place it in a microwave reactor, adjust the microwave power to 16kw to a material temperature of 71°C, and perform a microwave reaction for 6 minutes;

[0026] (2) After cooling the microwave reaction product to a temperature of 48°C, the solid and liquid were obtained by solid-liquid separation, and the solid was washed 7 times and dried for 3 hours at a temperature of 70°C to obtain sodium fluorosilicate.

[0027] The fluorine-containing silicon slag is the fluorine-containing gas produced during the processing of potassium-containing rocks, which is subjected to absorption treatment to obtain acidic solids.

[0028] The mass volume ratio of the fluorine-containing silicon slag to sodium hydroxide is 1:6, and the mixing and stirring time is 7 ...

Embodiment 2

[0035] A method for preparing sodium fluorosilicate from fluorine-containing silicon slag, comprising the following steps:

[0036] (1) Mix and stir the fluorine-containing silicon slag and 17% sodium hydroxide, place it in a microwave reactor, adjust the microwave power to 3kw to a material temperature of 118°C, and perform a microwave reaction for 10 minutes;

[0037] (2) After cooling the microwave reaction product to a temperature of 32°C, the solid and liquid were obtained by solid-liquid separation, and the solid was washed three times and dried for 1 hour at a temperature of 100°C to obtain sodium fluorosilicate.

[0038] The fluorine-containing silicon slag is the fluorine-containing gas produced in the production process of hydrogen fluoride, which is subjected to absorption treatment to obtain an acidic solid.

[0039] The mass volume ratio of the fluorine-containing silicon slag to sodium hydroxide is 1:6, and the mixing time is 55 minutes.

[0040] The solid-liqui...

Embodiment 3

[0046] A method for preparing sodium fluorosilicate from fluorine-containing silicon slag, comprising the following steps:

[0047] (1) Mix and stir the fluorine-containing silicon slag and 6% sodium hydroxide, place it in a microwave reactor, adjust the microwave power to 21kw to a material temperature of 83°C, and carry out microwave reaction for 18 minutes;

[0048] (2) After cooling the microwave reaction product to a temperature of 39°C, the solid and liquid were obtained by solid-liquid separation, and the solid was washed 5 times and dried for 2.5 hours at a temperature of 58°C to obtain sodium fluorosilicate.

[0049] The fluorine-containing silicon slag is the fluorine-containing gas generated during the decomposition of phosphate rock and the concentration of phosphoric acid, which is absorbed and treated to obtain acidic solids.

[0050] The mass volume ratio of the fluorine-containing silicon slag to sodium hydroxide is 1:1, and the mixing and stirring time is 7 mi...

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Abstract

The invention relates to industrial waste slag comprehensive utilization technologies, and specifically relates to a method for preparing sodium fluosilicate by using fluorine-containing silicon slag. The method comprises: fulling mixing the fluorine-containing silicon slag and sodium hydroxide with a concentration of 5% to 30%, adjusting microwave power to a metal temperature of 70 to 120 DEG C for microwave reaction for 3 to 60 min, and after a cooling temperature is 30 to 55 DEG C, obtaining solid sodium fluosilicate after solid-liquid separation and drying treatment . According to the process of the invention, waste fluorine-containing silicon slag is combined with the microwave technology, and sodium fluosilicate is generated in one step. Production costs are low and the process is simple, and harm of acidic silicon slag on the environment is eliminated. The invention is low-carbon environmental, and actually achieve an effect of fluorine-containing silicon slag environment friendly and high effective utilization and development.

Description

technical field [0001] The invention relates to a method for preparing sodium fluorosilicate from fluorine-containing silicon slag, which belongs to the technical field of chemical production. Background technique [0002] A large amount of fluorine-containing gases such as silicon tetrafluoride and hydrogen fluoride will be produced in the process of phosphate rock decomposition, phosphoric acid concentration, potassium-containing rock treatment, and hydrogen fluoride production. At present, most enterprises use water to absorb fluorine-containing silicon slag, but this method produces A large amount of silicon slag accumulates, which in turn causes serious environmental problems. Therefore, the reuse of fluorine-containing gases has become an urgent problem to be solved. [0003] Sodium fluorosilicate has a good application market. It can be used in the field of building materials as a moisture absorbent, retarder, preservative, etc.; in the field of latex products, it can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/10
Inventor 薛希仕邹锡洪任伟陈世毅
Owner GUIZHOU YUANSHENG POTASSIUM TECH
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