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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above two kinds of methods all need expensive chemical raw material, and cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 15% sulfuric acid in advance. Put the water-quenched iron-making slag in an oven and dry it at 120°C for 90 minutes to remove the adsorbed water on the surface and in the pipeline. Weigh 100g of the slag sample with an analytical balance, pour it into a 1000ml beaker, and take 850ml of the pre-configured Slowly pour 15% sulfuric acid solution into a beaker to react with the slag, and constantly stir with a glass rod, and constantly monitor the temperature change with a mercury thermometer. When the temperature of the reaction system does not rise any more, 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 change of the pH value of the system. When the reaction is carried out for 40 minutes, suspend stirring and wait for observation (at this time, the pH value of the system is below 1 and basically stable). If there are no obvious bubbles in the system, the acidolysis process is...

Embodiment 2

[0031] Prepare 10% sulfuric acid in advance for later use. Put the water-quenched slag of copper smelting into an oven and dry at 120°C for 90 minutes to remove the adsorbed water on the surface and in the pipeline. Weigh 50g of the slag sample with an analytical balance, pour it into a 1500ml beaker, and take 1200ml of the pre-configured Slowly pour 10% sulfuric acid solution into the beaker to react with the slag, and constantly stir with a glass rod, monitor the temperature change with a mercury thermometer, and 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 change of the pH value of the system. When the reaction is carried out for 35 minutes, the stirring is suspended and left to observe (at this time, the pH of the system is 2 mH 2 O.

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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.

Description

Technical field: [0001] The present invention relates to a method for preparing hydrated silicon dioxide, in particular to a method for preparing hydrated silicon dioxide by using metallurgical water-quenched slag (iron-smelting water-quenched slag, copper-smelting water-quenched slag, hereinafter referred to as "metallurgical water-quenched slag") . Background technique: [0002] There are two traditional methods for preparing hydrated silica: one is to use silicon tetrachloride as raw material, mix silicon tetrachloride vapor with hydrogen and air evenly, and react, hydrolyze and condense at high temperature (1100~1800`C). Prepare hydrated silica; the second is to use water glass as raw material, loosen through direct acidification (or use CO 2 High-temperature gas carbonization) to prepare hydrated silica precipitated in a flocculent structure. But above two kinds of methods all need expensive chemical raw material, and cost is higher. [0003] The content of the prese...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 李辽沙董元篪金霞何玉平李亚中
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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