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Preparation method of precipitated silicon dioxide

A technology of precipitating silica and silicate, which is applied in the chemical industry, can solve problems such as high production cost, environmental pollution, and low value of recyclables, and achieve the effect of reducing waste liquid discharge and loss

Inactive Publication Date: 2012-08-15
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition to the consumption of corresponding acids and salts, another problem that cannot be ignored is that when the reaction is completed, these acids will generate the corresponding inorganic salts NaCl and NaCl. 2 SO 4 Therefore, in the process of pressure filtration and washing, a large amount of salty and acidic wastewater will be produced. Due to factors such as concentration and process costs, the recovery cost of these salty and acidic wastewater is relatively high, and the value of the recyclables is not large. Therefore, It is inevitable that a large amount of waste water will be discharged
[0014] Since the above-mentioned process consumes a large amount of inorganic acid, a large amount of salty and acidic waste water is generated which cannot be recycled or recycled, and there are problems such as high production costs and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take a sodium silicate with a Baume degree of 37°Be' (20°C, the same below), add 4 times the amount (weight, the same below) of water to dilute, filter, and measure the diluent containing SiO 2 %=5.0%, Na 2 O% = 1.4%, its modulus n = 3.7, weigh 600g of the dilute solution, mix it with 600g of 1.8% NH under stirring 4 HCO 3 The solution is mixed (the reaction molar ratio is 1:1.0), until there is basically no SiO in the test liquid phase 2 , continue stirring for about 20 minutes, filter, wash the precipitate with water until the washing water is nearly neutral, drain, dry in an oven, and then pulverize to obtain about 27.5 g of the finished precipitated silica.

[0046] Filter out SiO in the aforementioned filter 2 After precipitation, obtain filtrate about 900g, pass CO 2 Reaction, test for NH 4 HCO 3 and NaHCO 3 The mixed solution, detect the NH 4 HCO 3 Content is 0.9%, NaHCO 3 The content is 1.9%. while 1.9% NaHCO 3 The amount reacted with sodium silicate...

Embodiment 2

[0048] Take a sodium silicate with a Baume degree of 40°Be', add 3 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 6.5%, Na 2 O%=2.1%, its modulus n=3.2, weighs 600g of this dilute sodium silicate solution, mixes with 700g containing 2.4% NH under stirring 4 HCO 3 The solution is mixed (the reaction molar ratio is 1:1.05), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 20 minutes, filter, and use 0.5% NH 4 HCO 3 The precipitate was washed with tap water for 3 times, and then washed with water until the washing water was nearly neutral, drained, dried in an oven, and then pulverized to obtain about 35 g of the finished precipitated silica.

[0049] Filter out SiO in the aforementioned filter 2 After precipitation, obtain filtrate about 900g, pass CO 2 Reaction, test for NH 4 HCO 3 and NaHCO 3 The mixed solution, detect the NH 4 HCO 3 Content is 1.3%, NaHCO 3 The content is...

Embodiment 3

[0051] Take a sodium silicate with a Baume degree of 46°Be', add 3.5 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 %=5.8%, Na 2 O%=2.2%, its modulus n=2.7, weigh 600g of this dilute sodium silicate solution, mix it with 700g containing 2.6% NH under stirring 4 HCO 3 The solution is mixed (reaction molar ratio is 1:1.08), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 20 minutes, filter, and use 0.3% NH 4 HCO 3 The precipitate was washed 3 times with tap water and washed with 0.02M dilute H 2 SO 4 Wash the precipitate 3 times, then wash with water until the washing water is nearly neutral, drain, dry in an oven, and then pulverize to obtain about 31 g of the finished precipitated silica.

[0052] Filter out SiO in the aforementioned filter 2 After precipitation, about 1000 g of filtrate were obtained. and collected with dilute NH 4 HCO 3 About 550g of washing water for solutio...

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PUM

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Abstract

The invention discloses a preparation method of precipitated silicon dioxide. The preparation method comprises the steps of reacting by using soluble silicate M2O.nSiO2 and NH4HCO3 as raw materials in a molar ratio of M2O.nSiO2 to NH4HCO3 of 1:(1.0-1.15), and precipitating out hydrated SiO2; removing filtrate through filtration; and washing and drying filter cake to obtain the precipitated silicon dioxide product, wherein M in the soluble silicate M2O.nSiO2 and carbonate M2CO3 is alkali metal element Na or K. According to the scheme, as the filtrate mainly contains M2CO3 and NH3, MHCO3 and NH4HCO3 can be generated via reaction with CO2, and MHCO3 can react with M2O.nSiO2 to precipitate out hydrated SiO2. Thus, in the preparation method, chemicals other than the silicon source can be reused, so that the production cost, the resource consumption and the environment damage are reduced.

Description

technical field [0001] The invention relates to a method for preparing precipitated silica, which belongs to the technical field of chemical industry. Background technique [0002] Precipitated silica, also known as white carbon black and precipitated white carbon black, is a hydrated amorphous silicic acid product, and its chemical expression is generally mSiO 2 ·nH 2 O, the appearance is a white highly dispersed amorphous powder, and a small amount is also processed into granules as a commodity. Insoluble in water and most acids, soluble in caustic soda and hydrofluoric acid, stable to other chemicals, resistant to high temperatures, does not decompose or burn at high temperatures, has high electrical insulation, porosity, large internal surface area, It is hygroscopic and non-toxic. [0003] Precipitated silica has a wide range of uses. As a good reinforcing agent for synthetic rubber, its performance is equal to or even better than carbon black. Others are used as thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/193C01B33/18
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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