CN111153408A - Method for recovering metallic silicon in silicon slag - Google Patents
Method for recovering metallic silicon in silicon slag Download PDFInfo
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- CN111153408A CN111153408A CN202010025057.2A CN202010025057A CN111153408A CN 111153408 A CN111153408 A CN 111153408A CN 202010025057 A CN202010025057 A CN 202010025057A CN 111153408 A CN111153408 A CN 111153408A
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- silicon
- slag
- dense medium
- silicon slag
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
- C01B33/037—Purification
Abstract
The invention relates to the technical field of silicon slag treatment, in particular to a method for recovering metallic silicon in silicon slag. The main technical scheme is as follows: a method for recovering metallic silicon in silicon slag comprises the following steps of 1) crushing the silicon slag: grinding the silicon slag to silicon slag particles with the particle size of 0.5 mm-5 mm; 2) mixing magnetite powder and water to obtain dense medium liquid A; the density of the dense medium liquid A is 2.4g/cm3～2.5g/cm3(ii) a 3) The dense medium liquid A circulates in a dense medium cyclone I; 4) feeding the silicon slag particles into a heavy medium cyclone I for cyclone to separate the metal silicon from the silicon slag; 5) carrying out liquid-solid separation on the overflowed product to obtain a first solid; 6) and drying the first solid to obtain the silicon slag with high metal silicon content. By adopting the method, the recovery rate of silicon metal in the silicon slag can be improved, and the silicon content in the recovered silicon metal can be improved.
Description
Technical Field
The invention relates to the technical field of silicon slag treatment, in particular to a method for recovering metallic silicon in silicon slag.
Background
The industrial silicon is a product which is smelted in an electric heating furnace by taking silica as a raw material and a carbonaceous raw material as a reducing agent, and the content of a main component silicon element of the industrial silicon is about 98 percent. Fe in industrial silicon smelting production process2O3、SiO2、MgO、Al2O3CaO, etc. Fe due to the difference in reduction temperature2O3、SiO2Most of which is reduced, Al2O3MgO and CaO are only partially reduced. Unreduced Al2O3MgO and CaO with SiO2Together forming a slag. The slag is accumulated together to form obvious light-color slag blocks which are limited between grain boundaries and have clear limits; and other slag becomes dark particles which can be seen only under a microscope and is mixed with silicon to become impurities in the silicon, and the silicon slag contains more than 15 percent of simple substance metallic silicon. The metallic silicon is not easy to separate from the silicon slag, the silicon slag is piled up as waste slag or used for paving for a long time, a large amount of land resources are occupied, and the reduced simple substance silicon of the silicon slag is not further effectively separated, so that the part of the simple substance silicon also occupies the land to be piled up, or is mixed in the silicon slag to form a cheap paving material, the serious waste of the silicon resources is caused, and the economic benefit of silicon production enterprises is influenced.
The existing silicon slag separation and recovery technology also realizes partial separation of silicon metal and oxides, but partial silicon and slag cannot be effectively separated due to the defects of granularity classification, the number of separation stages in the later period and the like, so that more metal silicon is remained in tailings, and the annual loss of silicon metal is extremely large. There is also a flotation method, in which the flotation is a separation method in which pulp composed of solid mineral particles and water is first mixed in a stirring tank with a suitable flotation agent and, if necessary, water is added to adjust the pulp concentration to suit the flotation requirements. In the flotation method, the useful minerals enter into the foam and become concentrate, so that the flotation is called positive flotation, and the reverse flotation is performed. However, the reagent proportion difficulty of flotation is high, the coagulation is easy, the flotation needs to wait for a long time for deposition, and the efficiency is low.
Disclosure of Invention
In view of the above, the present invention provides a method for recovering silicon metal from silicon slag, and mainly aims to improve the recovery rate of silicon metal from silicon slag and to increase the silicon content in the recovered silicon metal.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a method for recovering metallic silicon in silicon slag, which comprises the following steps:
1) crushing the silicon slag: grinding the silicon slag to silicon slag particles with the particle size of 0.5 mm-5 mm;
2) mixing magnetite powder and water to obtain dense medium liquid A; the density of the dense medium liquid A is 2.4g/cm3～2.5g/cm3；
3) The dense medium liquid A circulates in a dense medium cyclone I;
4) feeding the silicon slag particles into a heavy medium cyclone I for cyclone to separate the metal silicon from the silicon slag;
5) carrying out liquid-solid separation on the overflowed product to obtain a first solid;
6) and drying the first solid to obtain the silicon slag with high metal silicon content.
Further, the particle size of the magnetite powder is not less than 300 meshes.
Further, mixing magnetite powder and water to obtain dense medium liquid B;
the dense medium liquid B is sent into a dense medium cyclone II;
feeding the dried solid I into a heavy medium cyclone II for cyclone to separate the metal silicon from the silicon slag;
carrying out liquid-solid separation on the overflowed product to obtain a solid II;
and drying the second solid to obtain the silica slag with high metal silicon content.
Further, the density of the dense medium liquid B is 2.5g/cm3～2.6g/cm3。
Further, the density of the dense medium liquid A is 2.45g/cm3。
Further, the density of the dense medium liquid B is 2.55g/cm3。
Further, the first dense medium cyclone is a two-product cyclone.
Further, the step 1) is to grind the silicon slag into silicon slag particles with the particle size of 2 mm-3 mm.
Further, the dense medium liquid A is stored in a liquid storage tank; and the dense medium liquid A in the liquid storage tank forms circulation with the dense medium liquid A in the dense medium cyclone I through a pump.
Further, the cone angle of the first dense medium cyclone is 25 degrees.
By the technical scheme, the method for recovering the metallic silicon in the silicon slag at least has the following advantages:
the recovery rate of silicon metal in the silicon slag can be improved, and the silicon content in the recovered silicon metal can be improved.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a clear understanding of the technical solutions of the present invention and to be implemented in accordance with the teachings of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present application will be provided in conjunction with the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
One embodiment of the invention provides a method for recovering metallic silicon in silicon slag, which comprises the following steps:
1) crushing the silicon slag: grinding the silicon slag to silicon slag particles with the particle size of 0.5 mm-5 mm; preferably, the silicon slag is ground into silicon slag particles with the particle size of 2 mm-3 mm; the silicon slag material can reach the degree of monomer dissociation; the metallic silicon content of the silicon slag in the step 1) is 10-18 percent; typically 15%.
2) Mixing magnetite powder and water to obtain dense medium liquid A; the density of the dense medium liquid A is 2.4g/cm3～2.5g/cm3(ii) a It is more preferable that the dense medium liquid A has a density of 2.45g/cm3. Preferably, the magnetite powder has a particle size of not less than 300 mesh.
3) The dense medium liquid A circulates in a dense medium cyclone I; the dense medium liquid A is stored in a liquid storage tank; and the dense medium liquid A in the liquid storage tank forms circulation with the dense medium liquid A in the dense medium cyclone I through a pump.
4) Feeding the silicon slag particles into a heavy medium cyclone I for cyclone to separate the metal silicon from the silicon slag; preferably, the materials are uniformly fed into the dense medium cyclone I through a vibrating feeder to be sorted;
5) carrying out liquid-solid separation on the overflowed product to obtain a first solid;
6) and drying the first solid to obtain the silicon slag with high metal silicon content.
The method for recovering the metal silicon in the silicon slag provided by the embodiment of the invention can improve the recovery rate of the silicon metal in the silicon slag and the silicon content in the recovered silicon metal.
As a preferable example of the above embodiment, magnetite powder and water are mixed to prepare dense medium liquid B; preferably, the dense medium liquid B has a density of 2.5g/cm3～2.6g/cm3. It is more preferable that the dense medium liquid B has a density of 2.55g/cm3. The concentration of the dense medium liquid B is higher than that of the dense medium liquid A; to goldAnd further sorting the solid with high silicon content. The dense medium liquid B is sent into a dense medium cyclone II; feeding the dried solid I into a heavy medium cyclone II for cyclone to separate the metal silicon from the silicon slag; carrying out liquid-solid separation on the overflowed product to obtain a solid II; and drying the solid II to obtain the silicon slag with high metal silicon content. And (4) obtaining the silicon slag with higher metal silicon content through twice sorting with different densities.
Preferably, the first dense medium cyclone is a two-product cyclone, and two products with a higher density medium and a lower density medium are separated.
Preferably, in the above embodiment, the first heavy medium cyclone has a cone angle of 25 °, which is larger than that of a general heavy medium cyclone, and the discharge amount of the cyclone can be increased.
The industrial silicon slag is crushed to be less than 5mm, the mixed metal silicon can be fully decomposed and separated, the density of the metal silicon is about 2.34 grams per cubic centimeter, the density of the silicon slag is about 2.8 grams per cubic centimeter, the phase difference is too small, a heavy liquid with the density of 2.34 to 2.8 needs to be searched, the silicon can be separated from the slag, the organic heavy liquid can meet the density, but the organic matter is difficult to recover and cannot be produced in quantity, so the heavy medium liquid is selected, namely the water and the heavy medium are prepared according to the proportion, the silicon slag is separated by using a swirler, the heavy medium selects magnetite powder, the separation process can be easily recovered and recycled, the separation cost is low by using a heavy medium swirler, and the separation precision is high. After the heavy medium cyclone I and the heavy medium cyclone II are separated, the content of the metal silicon can be enriched to 50-60%, and then ingot casting is carried out through smelting, so that the purpose of industrial silicon recovery is achieved, and the profit is considerable.
The dense medium cyclone is a mineral separation device with simple structure, no moving parts and high separation efficiency. Because the cyclone has no moving part, the sorting process completely depends on the flexible matching of the self structural parameter and the external operation parameter to realize the optimal sorting precision, which is the outstanding characteristic of the cyclone coal sorting method and other ore sorting methods.
In the separation process of the dense medium cyclone, materials and suspension are fed into the cyclone along the tangential direction under certain pressure to form a powerful swirling flow; the liquid flow forms a descending external spiral flow along the inner wall of the cyclone from the material inlet; forming a rising inner spiral flow near the axis of the swirler; air is sucked due to the negative pressure of the inner spiral flow, and an air column is formed at the axis of the swirler; silicon in the feed material flows upwards along with the inner spiral flow and is discharged from the overflow port, and slag with high density flows downwards along with the outer spiral flow and is discharged from the bottom flow port.
Further still, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with such terms being used only to distinguish one element from another. Without departing from the scope of the exemplary embodiments. Similarly, the terms first, second, etc. do not denote any order or order, but rather the terms first, second, etc. are used to distinguish one element from another. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. A method for recovering metallic silicon in silicon slag is characterized by comprising the following steps:
1) crushing the silicon slag: grinding the silicon slag to silicon slag particles with the particle size of 0.5 mm-5 mm;
2) mixing magnetite powder and water to obtain dense medium liquid A; the density of the dense medium liquid A is 2.4g/cm3～2.5g/cm3；
3) The dense medium liquid A circulates in a dense medium cyclone I;
4) feeding the silicon slag particles into a heavy medium cyclone I for cyclone to separate the metal silicon from the silicon slag;
5) carrying out liquid-solid separation on the overflowed product to obtain a first solid;
6) and drying the first solid to obtain the silicon slag with high metal silicon content.
2. The method for recovering metallic silicon in silicon slag according to claim 1,
the excessive mesh number of the magnetite powder is not less than 300 meshes.
3. The method for recovering metallic silicon in silicon slag according to claim 1,
mixing magnetite powder and water to obtain dense medium liquid B;
the dense medium liquid B is sent into a dense medium cyclone II;
feeding the dried solid I into a heavy medium cyclone II for cyclone to separate the metal silicon from the silicon slag;
carrying out liquid-solid separation on the overflowed product to obtain a solid II;
and drying the second solid to obtain the silica slag with high metal silicon content.
4. The method for recovering metallic silicon in silicon slag according to claim 3,
the density of the heavy medium liquid B is 2.5g/cm3～2.6g/cm3。
5. The method for recovering metallic silicon in silicon slag according to claim 2,
the density of the dense medium liquid A is 2.45g/cm3。
6. The method for recovering metallic silicon in silicon slag according to claim 4,
the density of the dense medium liquid B is 2.55g/cm3。
7. The method for recovering metallic silicon in silicon slag according to claim 1,
and the first heavy medium cyclone is two product cyclones.
8. The method for recovering metallic silicon in silicon slag according to claim 1,
step 1) grinding the silicon slag to silicon slag particles with the particle size of 2 mm-3 mm.
9. The method for recovering metallic silicon in silicon slag according to claim 1,
the dense medium liquid A is stored in a liquid storage tank; and the dense medium liquid A in the liquid storage tank forms circulation with the dense medium liquid A in the dense medium cyclone I through a pump.
10. The method for recovering metallic silicon in silicon slag according to claim 1,
the cone angle of the first dense medium cyclone is 25 degrees.
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| CN202010025057.2A CN111153408A (en) | 2020-01-10 | 2020-01-10 | Method for recovering metallic silicon in silicon slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114671438A (en) * | 2022-03-31 | 2022-06-28 | 新疆西部合盛硅业有限公司 | Method for automatically controlling oxygen blowing refining by interlocking weight and temperature |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437833A (en) * | 2014-11-07 | 2015-03-25 | 贵州省贵金属矿产资源综合利用工程技术研究中心有限公司 | Physical upgrading method for enrichment of carbonaceous shale type vanadium ore |
| CN106629735A (en) * | 2016-12-09 | 2017-05-10 | 永平县泰达废渣开发利用有限公司 | Intelligent control batching separation system suitable for silicon plants |
| CN107055542A (en) * | 2016-11-18 | 2017-08-18 | 云南永昌硅业股份有限公司 | The method for handling siliceous white residue |
| CN108726522A (en) * | 2018-05-30 | 2018-11-02 | 云南永昌硅业股份有限公司 | A kind of white residue electoral method effectively improving silicon metal recovery rate |
| CN109319795A (en) * | 2018-10-18 | 2019-02-12 | 江西星火狮达科技有限公司 | The method of recycling purification silicon powder production silica solution from organosilicon slag |
-
2020
- 2020-01-10 CN CN202010025057.2A patent/CN111153408A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437833A (en) * | 2014-11-07 | 2015-03-25 | 贵州省贵金属矿产资源综合利用工程技术研究中心有限公司 | Physical upgrading method for enrichment of carbonaceous shale type vanadium ore |
| CN107055542A (en) * | 2016-11-18 | 2017-08-18 | 云南永昌硅业股份有限公司 | The method for handling siliceous white residue |
| CN106629735A (en) * | 2016-12-09 | 2017-05-10 | 永平县泰达废渣开发利用有限公司 | Intelligent control batching separation system suitable for silicon plants |
| CN108726522A (en) * | 2018-05-30 | 2018-11-02 | 云南永昌硅业股份有限公司 | A kind of white residue electoral method effectively improving silicon metal recovery rate |
| CN109319795A (en) * | 2018-10-18 | 2019-02-12 | 江西星火狮达科技有限公司 | The method of recycling purification silicon powder production silica solution from organosilicon slag |
Non-Patent Citations (1)
| Title |
|---|
| R？B？布哈普等: "重介质分选评述", 《国外金属矿选矿》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114671438A (en) * | 2022-03-31 | 2022-06-28 | 新疆西部合盛硅业有限公司 | Method for automatically controlling oxygen blowing refining by interlocking weight and temperature |
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