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A method for recycling aluminum fluoride by-product fluorine silicon slag

A technology for fluorosilicon slag and by-products, which is applied in the field of recycling of aluminum fluoride by-product fluorosilicon slag, can solve the problems of long process route, high cost, no effective recovery, etc., so as to solve the pollution problem and reduce the production cost. , the effect of high economic and environmental benefits

Inactive Publication Date: 2015-07-29
湖南有色金属投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, fluorine and aluminum are separated, so that the quality of the produced zeolite product is stable, but the process route is long, and at the same time, the fluorine and aluminum resources are not effectively recovered, and the remaining lye is not recovered. The cost of the whole process is quite High, difficult to realize industrial application

Method used

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  • A method for recycling aluminum fluoride by-product fluorine silicon slag
  • A method for recycling aluminum fluoride by-product fluorine silicon slag

Examples

Experimental program
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Effect test

Embodiment 1

[0019] This embodiment includes the following steps:

[0020] (1) Slurry: Add 260mL of water to 121.7g of aluminum fluoride by-product fluorosilicon slag (based on dry weight, containing 1.424mol Si in molar mass), stir evenly, and then add 409mL of NaOH solution with a mass fraction of 25% , control stirring speed 300r / min, temperature 90 ℃, slurry reaction 1h, get slurry liquid;

[0021] (2) Preparation of sodium aluminate solution: Take 249mL of NaOH solution with a mass fraction of 25%, boil it, and then add 66.6g of Al(OH) 3 powder, stirring and dissolving until the solution has no turbidity and precipitation, and NaAlO is obtained 2 solution;

[0022] (3) Synthesis: Add the sodium aluminate solution obtained in step (2) to the slurry obtained in step (1). After the addition is completed, control the stirring speed at 250r / min, the temperature at 95°C, and synthesize for 5 hours. , after filtering, washing and drying, the 4A zeolite product is obtained;

[0023] (4) C...

Embodiment 2

[0025] This embodiment includes the following steps:

[0026] (1) Slurry: Add 300mL of water to 121.7g of aluminum fluoride by-product silicon slag (based on dry weight, containing 1.424mol Si in molar mass), stir evenly, and then add 342mL of NaOH solution with a mass fraction of 30%. Control the stirring speed at 300r / min, the temperature at 95°C, and the slurrying reaction for 1 hour to obtain the slurrying liquid;

[0027] (2) Preparation of sodium aluminate solution: Take 200mL of NaOH solution with a mass fraction of 30%, boil it, and then add 72.2g Al(OH) 3 powder, stirring and dissolving until the solution has no turbidity and precipitation, and NaAlO is obtained 2 solution;

[0028] (3) Synthesis: Add the sodium aluminate solution obtained in step (2) to the slurry obtained in step (1). After the addition is complete, control the stirring speed to 300r / min and the temperature at 90°C for 6 hours of synthesis reaction. , after filtering, washing and drying, the 4A z...

Embodiment 3

[0031] This embodiment includes the following steps:

[0032] (1) Slurry: Add 300mL of water to 121.7g of aluminum fluoride by-product silicon slag (based on dry weight, containing 1.424mol of Si in it), stir evenly, and then add 356mL of NaOH solution with a mass fraction of 30%. Control the stirring speed at 300r / min, the temperature at 95°C, and the slurrying reaction for 1 hour to obtain the slurrying liquid;

[0033] (2) Preparation of sodium aluminate solution: Take 200mL of NaOH solution with a mass fraction of 30%, boil it, and then add 77.8g Al(OH) 3 powder, stirring and dissolving until the solution has no turbidity and precipitation, and NaAlO is obtained 2 solution;

[0034] (3) Synthesis: Add the sodium aluminate solution obtained in step (2) to the slurry obtained in step (1). After the addition is complete, control the stirring speed to 300r / min, the temperature is 95°C, and the synthesis reaction is 7h. , after filtering, washing and drying, the 4A zeolite p...

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Abstract

The invention discloses a method for recycling fluorine-silicon slag as a byproduct of aluminum fluoride. The method comprises the following steps: (1) adding water into the fluorine-silicon slag as the byproduct of aluminum fluoride, uniformly stirring, adding a NaOH solution, and carrying out a pulping reaction at the stirring speed of 250-350 r / min and at the temperature of 90-95 DEG C for 0.8-1.2 hours; (2) adding Al(OH)3 powder into the boiled NaOH solution, and stirring for dissolving until the solution is free from turbidity and precipitates; (3) adding a NaAlO2 solution into pulped liquid, carrying out a synthetic reaction at the stirring speed of 250-300 r / min and at the temperature of 90-95 DEG C for 5-8 hours, filtering, washing and drying; (4) recovering filtered mother liquid, adding a NaOH solid, heating NaOH for dissolving, filtering, drying a filter cake and recovering filtrate. By adopting the method, fluorine and silicon resources in fluorine slag can be utilized effectively, recycling of residual alkali liquor is realized, the production cost is lowered, the process flow is short, and convenience is brought to control.

Description

technical field [0001] The invention relates to a method for recycling fluorine silicon slag, a by-product of aluminum fluoride. Background technique [0002] A large amount of fluosilicic acid by-products will be produced in the industrial production process of hydrofluoric acid and phosphate fertilizer, and its added value is very low. If it is not treated, it will cause environmental pollution. Recently, with the gradual breakthrough of the washing technology of silica and sodium fluoride, the technology of preparing aluminum fluoride and cryolite from fluorosilicic acid has been successfully applied. The production line of aluminum fluoride prepared from fluorosilicic acid represented by Yunnan Yuntianhua Fluorochemical Co., Ltd. has been successfully operated, and the product quality is stable. Compared with the traditional use of hydrofluoric acid as raw material, its production cost is greatly reduced, so the process of preparing aluminum fluoride from fluorosilicic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14C01D3/02B09B3/00
Inventor 李程文王子龙廖志辉刘东晓段立山
Owner 湖南有色金属投资有限公司