Method for preparing hydrated silicon dioxide

A technology of hydrated silica and hydrated silicic acid, applied in the direction of silica, silicon oxide, etc., can solve the problems of high cost and expensive chemical raw materials, and achieve low cost, high value-added utilization, good environment and The effect of eco-efficiency

Inactive Publication Date: 2005-08-03
ANHUI UNIVERSITY OF TECHNOLOGY
0 Cites 9 Cited by

AI-Extracted Technical Summary

Problems solved by technology

But above two kinds of methods all need expen...
View more

Abstract

The present invention provides preparation process of hydrated silicon dioxide. Water quenched slag from iron smelting or copper smelting as material is acidolyzed and separated to obtain mixed hydrated silicic acid solution; and the mixed solution is processed through pH regulation, depurating, ageing, condensation, separation, washing and stoving to obtain hydrated silicon dioxide. The present invention has low cost, high utility and excellent environment and ecological effect.

Application Domain

Silica

Technology Topic

SlagPh regulation +5

Examples

  • Experimental program(2)

Example Embodiment

[0027] Example 1:
[0028] Prepare 15% sulfuric acid in advance for use. Put the iron-making quenching slag into an oven and dry it at 120℃ for 90 minutes, remove the adsorbed water on the surface and the pipe, weigh 100g of the slag sample with an analytical balance, and pour it into a 1000ml beaker, and take 850ml of the pre-configured The 15% sulfuric acid solution was slowly poured into the beaker to react with the slag, and continuously stirred with a glass rod, and continuously monitored the temperature change with a mercury thermometer. When the temperature of the reaction system no longer rises, move the beaker to a constant temperature water bath at 70°C to continue the reaction. During the process, use a pH meter to observe the changes in the pH value of the system. When the reaction progresses for 40 minutes, pause the stirring and stand for observation (the pH value of the system is below 1 and is basically stable). If there are no obvious bubbles in the system, the acid hydrolysis process ends. .
[0029] The reaction product was suction filtered and the filter cake was washed 3 times with 80 ml of distilled water. The filtrate was poured into another clean 1000 ml beaker, and then the pH value was adjusted to 3 with NaOH or ammonia water, and the beaker was placed at 95°C. After aging in a constant temperature water bath for 5 hours, the silicic acid in the system has polymerized and gelled. Take out the beaker, pour 300ml of distilled water into the beaker and stir well, let it stand, cool to room temperature, filter, wash the filter cake repeatedly with distilled water until the pH value is equal to 6, then dry and grind the filter cake to obtain the final product hydrated dioxide Silicon SiO 2 ·MH 2 O.

Example Embodiment

[0030] Example 2:
[0031] Prepare 10% sulfuric acid in advance for use. Put the copper smelting water quenching slag into an oven for drying at 120°C for 90 minutes, remove the adsorbed water on the surface and the pipe, weigh 50g of the slag sample with an analytical balance, and pour it into a 1500ml beaker, take 1200ml of the pre-configured The 10% sulfuric acid solution was slowly poured into the beaker to react with the slag, and continuously stirred with a glass rod. The temperature change was monitored with a mercury thermometer. When the temperature of the reaction system no longer rises, move the beaker to a constant temperature water bath at 70°C to continue the reaction. Use a pH meter to observe the changes in the pH value of the system. When the reaction progresses for 35 minutes, the stirring is suspended and left to stand for observation (the pH of the system is less than 1 and is basically constant). If no obvious bubbles are generated in the system, the acidolysis process ends. The reaction product was filtered with suction and the filter cake was washed with 100 ml of distilled water 3 times, the filtrate was poured into another clean 1500 ml beaker, and the pH value was adjusted to 5.5 with NaOH or ammonia water, and then filtered, and the beaker containing the filtrate was placed Aging in a constant temperature water bath at 95°C for 2 hours, take out the beaker and cool to about 60°C, slowly add concentrated sulfuric acid to the aging system, and wait until the color of the liquid in the system becomes light green and the precipitate is completely white. Stop joining. Let it stand for a period of time until the white matter gathers and settles at the bottom of the beaker, and when the upper part is a clear liquid, perform suction filtration. In the process of suction filtration, add distilled water and repeatedly rinse the filter cake until the pH value is equal to 6, then the filter cake is dried and ground to obtain the final product hydrated silica SiO 2 ·MH 2 O.

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Apparatus and method for low-density cellular wood plastic composites

InactiveUS20050067729A1less-expensivelow cost
Owner:STRANDEX CORP

Haptic trackball device

InactiveUS7710399B2simple actuatorlow cost
Owner:IMMERSION CORPORATION

Steering Arrangement for a Trailer

InactiveUS20110018231A1low cost
Owner:ZF FRIEDRICHSHAFEN AG

Classification and recommendation of technical efficacy words

  • good benefit
  • low cost

System and method for transmitting wireless digital service signals via power transmission lines

ActiveUS7929940B1reduce bandwidth requirementlow cost
Owner:NEXTEL COMMUNICATIONS

System and method for determination of position

InactiveUS20090149202A1low costreduce requirement
Owner:STEELE CHRISTIAN

Adaptive antenna optimization network

InactiveUS6961368B2low costminimal space
Owner:ERICSSON INC

Antenna device and method for attaching the same

ActiveUS20150138022A1low costimproved strength characteristic
Owner:NEC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products