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Method for preparing hydration silicon dioxide with blast furnace water-quenched slag

A technology of hydrated silica and blast furnace water quenching slag, which is applied in the direction of silica, silicon oxide, chemical instruments and methods, etc., to achieve low process cost, obvious environmental and social benefits, and the effect of eliminating pollution

Active Publication Date: 2016-08-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the method of preparing hydrated silica by using alkali-soluble hydrothermal combined digestion of blast furnace water-quenched slag has not been reported

Method used

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  • Method for preparing hydration silicon dioxide with blast furnace water-quenched slag

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Experimental program
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Effect test

Embodiment 1

[0026] The water-quenched blast furnace slag is dried, crushed and ground, and passed through a 200-mesh sieve. Take the undersize, weigh 15.013g and place it in a high-pressure reactor; weigh 8.881g of caustic soda reagent, add 80ml of deionized water to prepare a solution, add the caustic soda solution into the high-pressure reactor and stir, and then heat the furnace at 150°C Medium hydrothermal reaction 4h. After solid-liquid separation, the resulting filtrate contains Na + , Al 3+ silicate solution. The filtrate was placed in a constant temperature magnetic stirrer, heated to 60°C, and hydrochloric acid solution was slowly added dropwise to adjust the pH value of the silicate solution to 8 to obtain a suspension. Aging the suspension, cooling to normal temperature and filtering, the obtained filter cake was washed with water and pickled, then dried in a blast drying oven to obtain crude hydrated silica; finally, the crude hydrated Silica and water are mixed and stirre...

Embodiment 2

[0028] The water-quenched blast furnace slag is dried, crushed and ground, and passed through a 200-mesh sieve. Take the undersize, weigh 14.624g and place it in a high-pressure reactor; weigh 12.465g of caustic soda reagent, add 80ml of deionized water to prepare a solution, add the caustic soda solution into the high-pressure reactor and stir, and then heat the furnace at 150°C Medium hydrothermal reaction 8h. After solid-liquid separation, the resulting filtrate contains Na + , Al 3+ silicate solution. The filtrate was placed in a constant temperature magnetic stirrer, heated to 60°C, and hydrochloric acid solution was slowly added dropwise to adjust the pH value of the silicate solution to 9 to obtain a suspension. Aging the suspension, cooling to normal temperature and filtering, the obtained filter cake was washed with water and pickled, then dried in a blast drying oven to obtain crude hydrated silica; finally, the crude hydrated Silica and water are mixed and stirr...

Embodiment 3

[0030] The water-quenched blast furnace slag is dried, crushed and ground, and passed through a 200-mesh sieve. Take the undersize, weigh 16.364g and put it in a high-pressure reactor; weigh 10.964g of caustic soda reagent, add 80ml of deionized water to prepare a solution, add the caustic soda solution into the high-pressure reactor and stir, and then heat the furnace at 150°C Medium hydrothermal reaction for 6h. After solid-liquid separation, the resulting filtrate contains Na + , Al 3+ silicate solution. The filtrate was placed in a constant temperature magnetic stirrer, heated to 60°C, and hydrochloric acid solution was slowly added dropwise to adjust the pH value of the silicate solution to 9 to obtain a suspension. Aging the suspension, cooling to normal temperature and filtering, the obtained filter cake was washed with water and pickled, then dried in a blast drying oven to obtain crude hydrated silica; finally, the crude hydrated Silica and water are mixed and sti...

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Abstract

The invention discloses a method for preparing hydration silicon dioxide with blast furnace water-quenched slag, and belongs to the technical field of chemical industry production. The method comprises the steps that blast furnace water-quenched slag serves as a raw material and is smashed and ground, then the ground raw material is put into a high pressure reactor for a hydrothermal reaction with the alkali slag ratio of (0.55-1):1, the pH value of filter liquor obtained after filtering is regulated at 60 DEG C, and a suspension is obtained; the suspension is aged, filtered, washed and dried, and crude hydration silicon dioxide is obtained; crude hydration silicon dioxide is mixed with water, stirred, filtered and dried, and refined hydration silicon dioxide is obtained. The method has the advantages that blast furnace water-quenched slag serves as the raw material to prepare hydration silicon dioxide, the process is simple, and cost is low; besides, effective ingredients in slag are effectively utilized, and the environmental and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing silicon dioxide by using blast furnace water-quenched slag. technical background [0002] Hydrated silica is a highly dispersed amorphous powder, the main component is silicon dioxide, the molecular formula is SiO 2 ·nH 2 O, is an important inorganic fine chemical product. Hydrated silica has excellent properties such as good chemical stability, high temperature resistance, large specific surface area, non-toxic and tasteless, high dispersibility, etc. [0003] At present, the main methods for preparing hydrated silica include the traditional precipitation method using water glass as raw material, the dissociation method using montmorillonite as raw material, and the gas phase method using silicon tetrafluoride as raw material. There are many related literature reports. For example, CN 1648042A discloses that the water quenching s...

Claims

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Application Information

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IPC IPC(8): C01B33/12
CPCC01B33/126C01P2002/82
Inventor 李辽沙尤润泽林娜申星梅
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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