Process for preparing fumed silica in low temperature by taking silica fume, diatomite powder or opal powder as raw materials

A technology of fumed silica and diatomaceous earth powder is applied in the preparation of hydrogen chloride, silicon oxide, silicon dioxide, etc., and achieves the effects of low cost, cost saving and environmental protection treatment of waste water.

Active Publication Date: 2016-12-14
HUANGGANG NORMAL UNIV +1
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Problems solved by technology

After consulting relevant information and Chinese patent documents, no relevant reports were found on the use of other raw materials to produce fumed silica

Method used

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  • Process for preparing fumed silica in low temperature by taking silica fume, diatomite powder or opal powder as raw materials
  • Process for preparing fumed silica in low temperature by taking silica fume, diatomite powder or opal powder as raw materials
  • Process for preparing fumed silica in low temperature by taking silica fume, diatomite powder or opal powder as raw materials

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0028] The structure of the preparation device provided in this example is as follows: figure 1 As shown, the device includes a hot air feeding system, a chemical reaction system, a cooling system and an exhaust gas absorption system, wherein the hot air feeding system is used to store compressed air and send it into the chemical reaction system after heating the air. The hot air feeding system comprises an air compressor 12, an air storage tank 13, an air heater 14 and pipelines, the air compressor 12, the air storage tank 13 and the air heater 14 are connected by pipelines, and the pipelines are also provided with valves and meter.

[0029] The chemical reaction system is composed of an acid liquid storage tank 1, a feed bin 2 and a reactor 3, th...

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Abstract

The invention provides a process for preparing fumed silica in low temperature by taking silica fume, diatomite powder or opal powder as raw materials. The process includes that waste of the silica fume and the like are taken as the raw materials to be reacted with fluoride-containing acid fluid, hydrochloric acid and nitric acid to prepare the fumed silica high in value-added; the content of SiO2 in the obtained product is greater than 99.9%, the specific surface area measured through the multipoint BET method is 350-500m<2>/g, and the effect that turning waste into wealth is achieved. Acid gas generated from the preparation process is absorbed by a negative pressure water absorption tank, corresponding acid fluid can be obtained, and the acid fluid can be recycled when concentrated to a certain concentration. The invention further provides a production device used in the process, parts involved in the production device are commonly-used tool in chemical plants, low cost is achieved, and mass industrialized production can be realized.

Description

technical field [0001] The invention relates to a process method and a device for producing gas-phase white carbon black at low temperature by using microsilica powder / diatomite powder / opal powder, and belongs to the technical field of chemical purification and environmental protection. Background technique [0002] Micro-silica fume is also called silica fume or condensed silica fume. It is a large amount of highly volatile SiO produced in the submerged heat electric furnace when ferroalloy is smelting ferrosilicon and industrial silicon (metal silicon). 2 And Si gas, after the gas is discharged, it is rapidly oxidized and condensed with the air, and is recovered by dust removal and environmental protection equipment. It is a by-product of industrial silicon and ferrosilicon smelting. At present, it is mainly used as cement or concrete admixture, refractory additive, metallurgical pellet binder, chemical product dispersant, etc.; diatomaceous earth belongs to siliceous rock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B7/19C01B7/01C01B21/40
CPCC01B7/012C01B7/193C01B21/40C01B33/18C01P2006/12C01P2006/80
Inventor 田辉明杨水彬田正芳叶发兵
Owner HUANGGANG NORMAL UNIV
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