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Treating method for silicon slag produced during production of liquid sodium silicate

The technology of a liquid sodium silicate and a treatment method is applied in the treatment field of producing liquid sodium silicate to produce silicon slag, which can solve the problems of increasing production consumption and production cost, waste of resources, environmental pollution, etc., and achieves good flocculation and sedimentation effect and increases effect of benefit

Active Publication Date: 2016-09-07
山东龙港硅业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment method for the production of liquid sodium silicate to produce silicon slag, aiming at solving the waste treatment of silicon slag produced in the existing production of liquid sodium silicate. The silicon slag waste contains a considerable amount of quartz sand and silicic acid Sodium, causing a waste of resources, increasing production consumption and production costs, and because the silicon slag is alkaline, causing technical problems of environmental pollution

Method used

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Comparison scheme
Effect test

Embodiment 1

[0029] A treatment method for producing liquid sodium silicate to produce silicon slag, the treatment method comprising the following steps:

[0030] (1) Add the filtered silicon slag to the solid-liquid separation device and use high-pressure flushing water to wash it. The sodium silicate in the silicon slag dissolves and flows out of the solid-liquid separation device with the insoluble colloidal particles, and the quartz in the silicon slag the sand separates;

[0031] (2) washing the quartz sand separated in the step (1) with water again, and recycling after centrifugal dehydration;

[0032] (3) carry out flocculation and precipitation treatment to the washing water containing insoluble colloidal particles in step (1) and the washing liquid after washing in step (2), so that the insoluble colloidal particles in it are flocculated to form large colloidal particles and settle, and separate and settle Large colloidal particles;

[0033] Wherein, the above-mentioned solid-li...

Embodiment 2

[0039] A treatment method for producing liquid sodium silicate to produce silicon slag, the treatment method comprising the following steps:

[0040] (1) Add the filtered silicon slag to the solid-liquid separation device and use high-pressure flushing water to wash it. The sodium silicate in the silicon slag dissolves and flows out of the solid-liquid separation device with the insoluble colloidal particles, and the quartz in the silicon slag is the sand separates;

[0041] (2) washing the quartz sand separated in the step (1) with water again, and recycling after centrifugal dehydration;

[0042] (3) carry out flocculation and precipitation treatment to the washing water containing insoluble colloidal particles in step (1) and the washing liquid after washing in step (2), so that the insoluble colloidal particles in it are flocculated to form large colloidal particles and settle, and separate and settle Large colloidal particles;

[0043] Wherein, the above-mentioned solid-l...

Embodiment 3

[0049] A treatment method for producing liquid sodium silicate to produce silicon slag, the treatment method comprising the following steps:

[0050] (1) Add the filtered silicon slag to the solid-liquid separation device and use high-pressure flushing water to wash it. The sodium silicate in the silicon slag dissolves and flows out of the solid-liquid separation device with the insoluble colloidal particles, and the quartz in the silicon slag the sand separates;

[0051] (2) washing the quartz sand separated in the step (1) with water again, and recycling after centrifugal dehydration;

[0052] (3) carry out flocculation and precipitation treatment to the washing water containing insoluble colloidal particles in step (1) and the washing liquid after washing in step (2), so that the insoluble colloidal particles in it are flocculated to form large colloidal particles and settle, and separate and settle Large colloidal particles;

[0053] Wherein, the above-mentioned solid-li...

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Abstract

The invention belongs to the technical field of inorganic silicon production, and particularly relates to a treating method for silicon slag produced during production of liquid sodium silicate. The treating method comprises the following steps that filtered silicon slag is added into a solid-liquid separation device to be flushed with high-pressure flushing water, sodium silicate in the silicon slag is dissolved and flows out of the solid-liquid separation device along with insoluble colloidal granules and the flushing water, and quartz sand in the silicon slag is separated out; the separated-out quartz sand is flushed with water again and recycled after being centrifugally dewatered; and the flushing water containing the insoluble colloidal granules and the water flushing liquid obtained after the quartz sand is flushed are subjected to flocculation precipitation treatment, the insoluble colloidal granules in the water are flocculated to form large colloidal granules and settled, and the settled large colloidal granules are separated. Useful ingredients in the silicon slag are sufficiently recycled, the problem that environmental pollution and resource waste are caused due to the fact that the silicon slag is directly abandoned as solid waste is avoided, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of inorganic silicon production, and in particular relates to a treatment method for producing silicon slag produced from liquid sodium silicate. Background technique [0002] Inorganic silicon is a variety of inorganic chemical products with large output and consumption. There are many varieties, and most of the products are related to the upper and lower chains. It is an important material. Inorganic silicon mainly includes silicon dioxide, sodium silicate, sodium metasilicate, sodium orthosilicate and other silicon-containing inorganic substances. [0003] In the inorganic silicon industry, liquid sodium silicate is produced by the reaction of quartz sand and liquid caustic soda. Because this reaction is an excessive reaction, there must be unreacted quartz sand in the liquid sodium silicate after the reaction, which must be filtered before it can be used in the next step. or sale. [0004] The appearan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B5/68B03D3/06
CPCB03B5/68B03B7/00B03D3/06B03D2201/002
Inventor 王敬伟赵贝贝聂梓新
Owner 山东龙港硅业科技有限公司
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