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Production process for preparing recycled functional ultrapure nano silicon dioxide from low-grade fluorine-containing and silicon-containing waste slag by dry method

A nano-silica, production process technology, applied in the direction of silica, silicon oxide, silicon compounds, etc., can solve the problems of strong acidity of waste slag containing fluorine and silicon, easy scattering of powder in the environment, and high labor costs, and achieve relief The effect of fluorite resource pressure, low price and fast flotation speed

Active Publication Date: 2020-09-04
福建硅纳金新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Big bags need to be scrapped after being used several times, causing new environmental pollution
Fluorine-containing and silicon-containing waste slag is easily scattered during the process of sending the waste slag to the next process, which also causes environmental pollution along the way.
This method has high labor costs, loading and unloading requires a forklift or driving to complete, the operator needs to hold a special operation certificate, and the packaging cost is high
More importantly, waste slag containing fluorine and silicon is extremely acidic, and the pH of several batches of tests is less than 1, requiring special equipment for transportation and storage

Method used

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  • Production process for preparing recycled functional ultrapure nano silicon dioxide from low-grade fluorine-containing and silicon-containing waste slag by dry method
  • Production process for preparing recycled functional ultrapure nano silicon dioxide from low-grade fluorine-containing and silicon-containing waste slag by dry method
  • Production process for preparing recycled functional ultrapure nano silicon dioxide from low-grade fluorine-containing and silicon-containing waste slag by dry method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 (Product 1)

[0041] (1) Take 100 grams of fluorine-containing silicate slag (moisture content 35%), add 300ml of waste water for recycling, heat in the batching tank at a constant temperature of 80°C, add neutralizer (100mL per hour) and stir for 2 hours to obtain Ingredient A with a pH value of 8~9;.

[0042] (2) Take ingredient A and add flotation agent while stirring at 70-80°C until the pH is 7, filter, wash the precipitate with ultrapure water, dehydrate, and dry at 120°C to obtain precipitate A;

[0043] (3) Add KH570 coupling agent at room temperature, the mass percentage of coupling agent and precipitation A is 1:8, further carry out flotation, filtration, cleaning, dehydration on precipitation A, and then dry and cool;

[0044] (4) 51.63 grams of 2000-mesh silicon dioxide were obtained by air supersonic crushing and classification, SiO 2 The recovery rate can reach more than 99.29%, and the silica content is 99.95%.

Embodiment 2

[0045] Example 2 (Product 2)

[0046] (1) Take 100 grams of fluorine-containing silicate slag (moisture content 35%), add 300ml of waste water for recycling, heat in the batching tank at a constant temperature of 80°C, add neutralizer (100mL per hour) and stir for 2 hours to obtain Ingredient A with a pH value of 8~9;.

[0047] (2) Take ingredient A and add flotation agent while stirring at 70-80°C until the pH is 7, filter, wash the precipitate with ultrapure water, dehydrate, and dry at 120°C to obtain precipitate A;

[0048] (3) Add KH570 coupling agent at room temperature, the mass percentage of coupling agent and precipitation A is 1:10, further carry out flotation, filtration, cleaning, dehydration on precipitation A, and then dry and cool;

[0049] (4) Obtain 51.70 grams of 5000-mesh silicon dioxide after supersonic crushing and classification and cyclone dust removal, SiO 2 The recovery rate can reach more than 99.42%, and the obtained samples are calculated by eleme...

Embodiment 3

[0050] Example 3 (Product 3)

[0051] (1) (1) Take 100 grams of fluorine-containing silicate slag (moisture content 35%), add 300ml of waste water for recycling, heat in the batching tank at a constant temperature of 80°C, add neutralizer (at a speed of 100mL per hour) and stir 2 hours to obtain a pH value of 8 ~ 9 ingredients A;.

[0052] (2) Take ingredient A and add flotation agent while stirring at 70-80°C until the pH is 7, filter, wash the precipitate with ultrapure water, dehydrate, and dry at 120°C to obtain precipitate A;

[0053] (3) Add KH570 coupling agent at room temperature, the mass percentage of coupling agent and precipitation A is 1:9, further carry out flotation, filtration, cleaning, dehydration on precipitation A, and then dry and cool;

[0054] (4) The dust generated after supersonic crushing and classification, cyclone dust removal and bag dust removal is collected by pipeline dust collectors and collectors to synthesize 51.78 grams of nano-scale functi...

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PUM

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Abstract

The invention particularly relates to a production process for preparing recycled functional ultrapure nano silicon dioxide from low-grade fluorine-containing and silicon-containing waste slag by a dry method. According to the method, the fluorine-containing and silicon-containing slag is treated by adopting a neutralizer, a flotation agent and a coupling agent; two times of flotation processes are performed; fluorine-containing silicon slag tailing resources can be fully and comprehensively utilized; the process reduces dependence on the natural silicon ore, has multiple benefits of reducingenvironmental pollution, obtaining the ultrapure functional nano silicon dioxide and relieving fluorite resource pressure, can recover ultrapure SiO2 with different mesh numbers, does not need specialequipment, and can achieve the SiO2 recovery rate of 99% or above.

Description

technical field [0001] The invention relates to a method for extracting silicon dioxide from slag, in particular to a production process for preparing and recovering functional ultra-pure nano silicon dioxide from waste slag containing fluorine and silicon by dry method. Background technique [0002] Natural silicon oxide has a density of 2.65 and a Mohs hardness of 7. It is the second most abundant element in the earth, but there is relatively little high-quality natural silicon. Since silicon ore is a non-pillar resource of the national economy in my country, and it is also a variety of non-metallic minerals with unproved reserves in my country, most of the reserves in the country are estimated or unknown. According to relevant data, my country's silicon ore reserves reach 14 billion tons, while vein quartz reserves with a silicon dioxide content of more than 99% are only 50 million tons. Natural silica ore is processed into micropowder through multiple processes such as ...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82Y40/00
CPCC01B33/186B82Y40/00C01P2004/03C01P2006/80
Inventor 蔡景华邵艳群黄雨迪雷游生林德源何佳润
Owner 福建硅纳金新材料有限公司