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A method for preparing high-purity quartz material using tailings

A technology of quartz materials and tailings, which is applied in the field of preparing high-purity quartz materials by using tailings, which can solve the problems of producing quartz materials, small internal stress, and inability to effectively use them, and achieve the effects of uniform particle size and cost reduction

Active Publication Date: 2020-12-15
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For the above defects or improvement needs of the prior art, the invention provides a method for preparing high-purity quartz materials by using tailings, the purpose of which is to produce the tailings of quartz materials (comprising VAD, OVD, etc.) by chemical synthesis. The raw material is mixed with natural high-purity quartz sand or artificial quartz powder (collectively referred to as quartz granules) to form a certain graded mixture, which is fired into a quartz embryo material with uniform texture and low internal stress through a specific blanking process. This solves the technical problem that the existing technology cannot effectively use the chemical synthesis method to produce the tailings of quartz materials

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  • A method for preparing high-purity quartz material using tailings

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Effect test

Embodiment 1

[0046] A method for preparing high-purity quartz material from tailings, comprising the following steps:

[0047] (1) Grading of raw materials: put the tailings and natural quartz sand into the mixing device and heat, stir and mix them at 300°C. The selected tailings have a density of 0.34g / cm3, an average particle size of 209nm, and an average particle size of quartz sand. 122um, after mixing, the volume ratio of the tailings is 4.7%, and the density of the mixture is 1.55g / cm3, the prepared mixture is cooled to room temperature and loaded into the feeding device.

[0048] (2) Firing deposition: successively inject hydrogen and oxygen into the blowtorch to ignite to form a stable hydrogen-oxygen flame. The total flow of hydrogen is 158slm, the total flow of oxygen is 105slm, and the rotating platform rises 474mm from the furnace mouth at a speed of 5.3mm / min. When reaching the position of the observation port, the temperature of the furnace is stably controlled at 1570°C ± 20...

Embodiment 2

[0054] A method for preparing high-purity quartz material from tailings, comprising the following steps:

[0055] (1) Grading of raw materials: put the tailings and natural quartz sand into the mixing device and heat, stir and mix them at 300°C. The selected tailings have a density of 0.54g / cm3, an average particle size of 226nm, and an average particle size of quartz sand. 122um, after mixing, the volume ratio of the tailings is 7.4%, and the density of the mixture is 1.31g / cm3, the prepared mixture is cooled to room temperature and packed into the feeding device.

[0056] (2) Firing deposition: successively inject hydrogen and oxygen into the blowtorch to ignite to form a stable hydrogen-oxygen flame. The total flow of hydrogen is 148slm, the total flow of oxygen is 105slm, and the rotating platform rises 474mm from the furnace mouth at a speed of 5.3mm / min. When reaching the position of the observation port, the temperature of the furnace is stably controlled at 1560°C ± 20...

Embodiment 3

[0062] A method for preparing high-purity quartz material from tailings, comprising the following steps:

[0063] (1) Grading of raw materials: put the tailings and natural quartz sand into the mixing device and heat, stir and mix them at 300°C. The selected tailings have a density of 0.34g / cm3, an average particle size of 209nm, and an average particle size of quartz sand. 122um, after mixing, the volume ratio of the tailings is 2.2%, and the density of the mixture is 1.89g / cm3, the prepared mixture is cooled to room temperature and loaded into the feeding device.

[0064] (2) Firing deposition: successively inject hydrogen and oxygen into the blowtorch to ignite to form a stable hydrogen-oxygen flame. The total flow of hydrogen is 158slm, the total flow of oxygen is 108slm, and the rotating platform rises 474mm from the furnace mouth at a speed of 5.3mm / min. When reaching the position of the observation port, the temperature of the furnace is stably controlled at 1575°C ± 20...

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Abstract

The invention discloses a method for preparing high-purity quartz material by using tailing material. The method comprises the following steps of (1) raw material grading: grading quartz tailing material and quartz particle into mixed material through heating mixing, wherein the volume ratio of the quartz tailing material in the mixed material is 2 to 9 percent, and the density of the mixed material is 1.2 to 1.8 g / cm<3>; and (2) firing deposition: heating the mixed material through a torch lamp via a material supply device to a molten state, and then entering a rotating deposition furnace tobe deposited onto a base plate to form the quartz material. According to the method disclosed by the invention, the tailing material and the quartz particle material are subjected to mixing grading tobe made into mixed material; the characteristics of high purity and uniform granularity of the tailing material are sufficiently utilized; the high-purity quartz material with high added value is prepared; the cost is reduced by 5 percent or more; the tailing material is effectively utilized; the bubbles inside the quartz blank material formed through melting can be reduced; and the product quality is improved.

Description

technical field [0001] The invention belongs to the field of quartz material preparation, and more specifically relates to a method for preparing high-purity quartz material by utilizing tailings. Background technique [0002] During the preparation process of optical fiber preforms and high-purity quartz glass materials, some raw materials will not form products, and will be collected as tailings through the dust collection system. The tailings are SiO2 particles, which have the characteristics of high purity and low density. Especially It is a synthetic method that produces a large amount of tailings in the preparation of optical fiber preform core rods, sleeves and high-purity synthetic quartz, but the tailings have not been well recycled at present. [0003] At present, the main methods for preparing optical fiber preforms and high-purity quartz materials are chemical synthesis methods, such as VAD (Vapor Axial Deposition) and OVD (External Vapor Deposition). The quartz ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/06C03B20/00
CPCC03B20/00C03C3/06
Inventor 郭飞张国锬白华陈刚熊良明罗杰
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD