Hazardous waste treatment device and production line for industrial silicon and organic silicon production

Abstract

The utility model discloses a hazardous waste treatment device and a production line for industrial silicon and organic silicon production, and the hazardous waste treatment device comprises a raw material pretreatment device for pretreating silicon industrial hazardous waste; the oxygen-enriched side-blown furnace is arranged at the discharging end of the raw material pretreatment device and is used for carrying out reduction smelting and slagging reaction on the pretreated industrial dangerous silicon waste; the recovery treatment device is arranged at a slag discharge port of the oxygen-enriched side-blown converter and is used for receiving slag discharged by the oxygen-enriched side-blown converter and carrying out precipitation separation; and the flue gas treatment device is used for performing innocent treatment on flue gas discharged by reduction smelting of the oxygen-enriched side-blown converter.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste treatment in the production of industrial silicon and organic silicon, and in particular, to a hazardous waste treatment device for the production of industrial silicon and organic silicon. In addition, the utility model also relates to a production line including the hazardous waste treatment device for the production of industrial silicon and organic silicon. Background Art

[0002] During the production process of industrial silicon and organic silicon, a large amount of hazardous wastes such as slurry residue and waste contacts are generated. The main components of slurry residue and waste contacts are silicon, copper, carbon, zinc, etc. Slurry residue and waste contacts are fine particles, and the copper powder is highly active. They are easily oxidized when exposed to air, causing the organic matter and carbon in them to burn and emit pungent white smoke. They are not easy to store, and there is a serious "three wastes" problem.

[0003] In the prior art, there are many problems in the treatment systems of hazardous wastes such as slurry residues and waste contacts produced by industrial silicon and organosilicon production, such as the waste contacts and slurry residue treatment system and process generated in the organosilicon production process disclosed in Publication No. CN110607451A, a method for resource utilization of organosilicon slurry residue hydrolysis residue and waste contacts disclosed in Publication No. CN112251608A, a pretreatment method for harmless incineration disposal of organosilicon slurry residue hazardous waste disclosed in Publication No. CN115738160A, and a method and system for harmless disposal and classified resource utilization of organosilicon slurry residue and waste contacts disclosed in Publication No. CN11694928A. The technical solutions in the prior art all adopt wet process treatment, which is long and complicated, with low silicon recovery rate and serious water pollution, and is difficult to industrialize, and is mostly disposed of by landfill after incineration. Utility Model Content

[0004] The utility model provides a hazardous waste treatment device and a production line for industrial silicon and organic silicon production, so as to solve the technical problems in the prior art of long and complicated hazardous waste treatment process of silicon industry, serious pollution and low resource recovery rate.

[0005] According to one aspect of the utility model, a hazardous waste treatment device for industrial silicon and organosilicon production is provided, the hazardous waste treatment device comprising:

[0006] Raw material pretreatment equipment, used for pretreatment of hazardous waste from industrial silicon and organosilicon production;

[0007] The oxygen-enriched side-blowing furnace is arranged at the discharge end of the raw material pretreatment device and is used for reduction smelting and slag-making reaction of the pretreated hazardous waste;

[0008] A recovery and processing device, arranged at the slag discharge port of the oxygen-enriched side-blowing furnace, for receiving the slag discharged from the oxygen-enriched side-blowing furnace and separating the slag from the metal precipitate;

[0009] The flue gas treatment device is used to perform harmless treatment on the flue gas discharged from the oxygen-enriched side-blown furnace.

[0010] As a further improvement of the above technical solution, the raw material pretreatment device includes a raw material bin, a dryer and a briquetting machine. The raw material bin is used to gather the raw materials and transport them to the dryer. The dryer is used to reduce the moisture content of the raw materials and then transport the raw materials to the briquetting machine. The briquetting machine is used to press the raw materials and ingredients into blocks.

[0011] As a further improvement of the above technical solution, the raw material pretreatment device also includes a batching bin and a conveyor belt arranged below the batching bin, and the output end of the conveyor belt is located above the feed inlet of the oxygen-enriched side-blown furnace.

[0012] As a further improvement of the above technical solution, a plurality of the batching bins are arranged along the conveying direction of the conveyor belt.

[0013] As a further improvement of the above technical solution, the recycling and processing device includes an electric heating front bed and an ingot casting machine. The electric heating front bed is used to insulate and precipitate the slag to further separate it into metal and slag, and to water quench and discharge the slag. The ingot casting machine is used to cast the metal separated from the slag into ingots.

[0014] As a further improvement of the above technical solution, the molten pool depth of the oxygen-enriched side-blown furnace is reduced by 300-500 mm.

[0015] As a further improvement of the above technical solution, the flue gas treatment device includes a waste heat boiler arranged at the flue gas outlet end of the oxygen-enriched side-blown furnace.

[0016] As a further improvement of the above technical solution, the flue gas treatment device also includes a harmless treatment device, which is arranged at the outlet end of the waste heat boiler and connected to the raw material pretreatment device, and is used to recover the smoke dust in the flue gas after waste heat recovery and transport it to the raw material pretreatment device.

[0017] As a further improvement of the above technical solution, the flue gas treatment device also includes an exhaust device for exhausting residual flue gas.

[0018] According to another aspect of the utility model, a production line is also provided, which includes the above-mentioned hazardous waste treatment device for industrial silicon and organosilicon production.

[0019] The utility model has the following beneficial effects:

[0020] The raw material pretreatment device is used to pre-treat hazardous wastes such as slurry residue and waste contacts produced by industrial silicon and organic silicon, so that the treated raw materials are added with reducing agents and fluxes and then enter the oxygen-enriched side-blown furnace. Oxygen-enriched air or fuel is blown into the oxygen-enriched side-blown furnace for reduction smelting at high temperature. Valuable metals such as copper and nickel are reduced to a metallic state and sink to the bottom of the molten pool of the oxygen-enriched side-blown furnace. Black copper products can be produced by regular discharge, realizing the recovery of valuable metal resources, while other substances undergo slag-forming reactions under the action of the added flux to form molten glass-state harmless slag with good fluidity. The slag and metal are further separated by the recovery and treatment device. During the production process, the flue gas discharged from the flue of the oxygen-enriched side-blown furnace is harmlessly treated by the flue gas treatment device and then discharged. The method of reducing and smelting hazardous wastes such as slurry residue and waste contacts in this hazardous waste treatment device based on the oxygen-enriched side-blown furnace is easier to realize industrial production than the wet treatment method in the prior art, has large processing capacity, energy saving and consumption reduction, low operating cost, and realizes the reduction, harmlessness, and resource recycling of hazardous wastes, and has broad promotion prospects.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 It is a schematic diagram of the structure and workflow of a preferred embodiment of the utility model.

[0024] Legend:

[0025] 1. Raw material warehouse 2. Dryer 3. Briquetting machine 4. Batching warehouse 5. Conveyor belt 6. Oxygen-enriched side-blowing furnace 7. Electric heating front bed 8. Ingot casting machine 9. Recovery warehouse 10. Waste heat boiler 11. Exhaust device. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0027] Figure 1 It is a schematic diagram of the structure and workflow of a preferred embodiment of the utility model.

[0028] like Figure 1 As shown, the hazardous waste treatment device for industrial silicon and organosilicon production in this embodiment includes:

[0029] Raw material pretreatment device, used for pretreatment of hazardous wastes from industrial silicon and organosilicon production; hazardous wastes include pulp residue, waste contacts, etc.;

[0030] The oxygen-enriched side-blowing furnace 6 is arranged at the discharge end of the raw material pretreatment device and is used for reducing, smelting and slagging the pretreated silicon industrial hazardous waste;

[0031] The recovery and processing device is arranged at the slag discharge port of the oxygen-enriched side-blowing furnace 6, and is used to receive the slag discharged from the oxygen-enriched side-blowing furnace 6 and separate the slag from the metal precipitate;

[0032] The flue gas treatment device is used to perform harmless treatment on the flue gas discharged from the oxygen-enriched side-blowing furnace 6.

[0033] It should be noted that the main components of the slurry residue and waste contacts produced by industrial silicon and organosilicon are silicon, copper, carbon, zinc, etc., with contents of 65% to 80%, 3% to 20%, 1% to 10%, and 0.05% to 2.0%, respectively. Refer to Table 1, which is a table of the components of hazardous wastes such as slurry residue and waste contacts produced by industrial silicon and organosilicon in a specific embodiment;

[0034]

[0035] Table 1 Composition of hazardous wastes from silicon industry

[0036] The working principle of this hazardous waste treatment device is as follows: hazardous wastes such as slurry residue and waste contacts produced by industrial silicon and organic silicon are pretreated by a raw material pretreatment device, and the treated raw materials are added with a reducing agent and a flux and then enter the oxygen-enriched side-blowing furnace 6. Oxygen-enriched air or fuel is blown into the oxygen-enriched side-blowing furnace 6 for reduction smelting at high temperature. Valuable metals such as copper and nickel are reduced to a metallic state and sink to the bottom of the molten pool of the oxygen-enriched side-blowing furnace 6. Black copper products can be produced by regular discharge, thereby realizing the recovery of valuable metal resources. Other substances undergo slag-forming reactions under the action of the added flux to form molten glass-state harmless slag with good fluidity. The slag and metal are further separated by a recovery and treatment device. During the production process, the flue gas discharged from the flue of the oxygen-enriched side-blowing furnace 6 is harmlessly treated by a flue gas treatment device before being discharged. The method of reducing and smelting hazardous wastes such as slurry slag and waste contacts in this hazardous waste treatment device based on the oxygen-enriched side-blown furnace 6 is easier to realize industrial production than the wet treatment method in the prior art. It has a large processing capacity, energy saving and consumption reduction, and low operating costs. It can achieve the reduction, harmlessness, and resource recycling of hazardous wastes, and has a promising prospect for promotion.

[0037] In this embodiment, the raw material pretreatment device includes a raw material bin 1, a dryer 2 and a briquetting machine 3. The raw material bin 1 is used to gather the raw materials and transport them to the dryer 2. The dryer 2 is used to reduce the moisture content of the raw materials and then transport the raw materials to the briquetting machine 3. The briquetting machine 3 is used to press the raw materials and ingredients into blocks; specifically, since the moisture content of pulp residue and sludge is relatively high, the average moisture content is 35%, and the particle size is fine, the viscosity is low, it is not easy to aggregate, and it is not suitable to be directly put into the furnace for treatment. By setting a principle bin to collect the raw materials and transport them to the dryer 2 for drying, the moisture content is reduced, and waste contact bodies are mixed in. Fine lime is used as a binder to increase the raw material agglomeration ability. The mixed material is pressed into a material mass of about 30-60 mm by the briquetting machine 3. The dried material mass, flux, and reducing agent are put into the furnace for treatment according to a certain ratio;

[0038] Furthermore, the raw material pretreatment device also includes a batching bin 4 and a conveyor belt 5 arranged below the batching bin 4. The output end of the conveyor belt 5 is located above the feed inlet of the oxygen-enriched side-blowing furnace 6. The mixed material after preparation is output from the batching bin 4 and falls onto the belt, and is transported by the belt into the oxygen-enriched side-blowing furnace 6. Among them, multiple batching bins 4 are arranged along the conveying direction of the conveyor belt 5, which increases the material conveying amount and efficiency, increases the output, and makes full use of the working capacity of the oxygen-enriched side-blowing furnace 6.

[0039] In this embodiment, a recovery bin 9 is provided at the discharge end of the oxygen-enriched side-blown furnace 6. Metal oxides such as copper in the material undergo a reduction reaction to generate black copper which sinks to the bottom of the furnace and is discharged into the recovery bin 9 by siphoning to be cast into black copper ingots.

[0040] Since the content of valuable metals such as copper in the raw materials is relatively low and the molten pool metal is relatively small, the molten pool depth is adjusted in this embodiment, and the molten pool depth is reduced by 300-500mm. Under the stirring of oxygen-enriched air, the slag contains a high copper content. In order to further improve the recovery rate of metals such as copper, the recovery and processing device includes an electric heating front bed 7 and an ingot casting machine 8. The electric heating front bed 7 is used to heat and precipitate the slag to further separate it into valuable metals and slag, and the slag is water-quenched to form a glassy solidified water-quenched slag and discharged, which can be recycled and sold as a building material raw material or a paving base material. The ingot casting machine 8 is used to cast the metal separated from the slag into ingots.

[0041] In this embodiment, the flue gas treatment device includes a waste heat boiler 10 arranged at the flue gas outlet end of the oxygen-enriched side-blowing furnace 6, which further recovers and utilizes the heat in the flue gas, reduces energy consumption, and improves resource utilization.

[0042] In this embodiment, the flue gas treatment device also includes a harmless treatment device, which is arranged at the outlet end of the waste heat boiler 10 and connected to the raw material pretreatment device, and is used to recover the smoke dust in the flue gas after waste heat recovery and transport it to the raw material pretreatment device. The smoke dust obtained after the cooling and dust collection process has a low moisture content, and is mixed with the raw material and re-pressed into a ball, thereby further improving resource utilization.

[0043] In this embodiment, the flue gas treatment device further includes an exhaust device 11 for exhausting the remaining flue gas, which can be specifically configured as a centrifugal fan and a chimney to extract the remaining flue gas and discharge it through the chimney.

[0044] On the other hand, this embodiment also provides a production line, which is equipped with the above-mentioned hazardous waste treatment device for industrial silicon and organosilicon production.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hazardous waste treatment device for industrial silicon and organosilicon production, characterized in that: The hazardous waste treatment device comprises: Raw material pretreatment equipment, used for pretreatment of hazardous waste from industrial silicon and organosilicon production; An oxygen-enriched side-blowing furnace (6) is arranged at the discharge end of the raw material pretreatment device and is used for performing reduction smelting and slag-forming reaction on the pretreated hazardous waste; A recovery and processing device, arranged at the slag discharge port of the oxygen-enriched side-blowing furnace (6), for receiving the slag discharged from the oxygen-enriched side-blowing furnace (6) and separating the slag from the metal precipitate; The flue gas treatment device is used for harmlessly treating the flue gas discharged from the oxygen-enriched side-blowing furnace (6).

2. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 1, characterized in that: The raw material pretreatment device comprises a raw material bin (1), a dryer (2) and a briquetting machine (3); the raw material bin (1) is used to gather the raw materials and transport them to the dryer (2); the dryer (2) is used to reduce the moisture content of the raw materials and then transport the raw materials to the briquetting machine (3); the briquetting machine (3) is used to briquette the raw materials and ingredients into blocks.

3. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 2, characterized in that: The raw material pretreatment device also includes a batching bin (4) and a conveyor belt (5) arranged below the batching bin (4), and the output end of the conveyor belt (5) is located above the feed inlet of the oxygen-enriched side-blowing furnace (6).

4. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 3, characterized in that: The plurality of batching bins (4) are arranged along the conveying direction of the conveyor belt (5).

5. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 1, characterized in that: The recycling and processing device comprises an electric heating front bed (7) and an ingot casting machine (8). The electric heating front bed (7) is used to heat-insulate and precipitate the slag to further separate it into metal and slag, and to quench the slag with water and discharge it. The ingot casting machine (8) is used to cast the metal separated from the slag into ingots.

6. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 1, characterized in that: The molten pool depth of the oxygen-enriched side-blown furnace (6) is reduced by 300-500 mm.

7. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 1, characterized in that: The flue gas treatment device comprises a waste heat boiler (10) arranged at the flue gas outlet end of the oxygen-enriched side-blowing furnace (6).

8. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 7, characterized in that: The flue gas treatment device also includes a harmless treatment device, which is arranged at the outlet end of the waste heat boiler (10) and connected to the raw material pretreatment device, and is used to recover smoke dust in the flue gas after waste heat recovery and transport it to the raw material pretreatment device.

9. The hazardous waste treatment device for industrial silicon and organosilicon production according to claim 8, characterized in that: The flue gas treatment device also includes an exhaust device (11) for exhausting residual flue gas.

10. A production line, characterized in that: The hazardous waste treatment device for industrial silicon and organosilicon production as described in any one of claims 1 to 9 is used.

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