Heavy hazardous waste resourceful treatment system

Abstract

The utility model discloses a heavy-related hazardous waste resourceful treatment system which comprises a burdening and brickmaking system, a smelting and water quenching system and a flue gas treatment system connected with the smelting and water quenching system, the smelting and water quenching system comprises a smelting furnace, and the smelting furnace is arranged to be used for receiving solid waste bricks made by the burdening and brickmaking system; and copper matte is formed. According to the heavy hazardous waste resourceful treatment system, after hazardous waste is treated, the recovery rate of copper can be increased, in addition, precious metal such as gold and silver can be melted in copper, and the effect of resourceful recovery is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the harmless disposal and resource utilization field of dangerous waste, specifically relates to a kind of heavy dangerous waste resource processing system. BACKGROUND

[0002] Metal is a non-renewable natural resource, and if metal waste is not properly disposed of, it can pollute the environment. By extracting copper matte from metal waste, these valuable resources can be reused, reducing the need for new ore resources, thereby saving natural resources.

[0003] Chinese patent No. 201821680723.0 discloses a multi-phase dangerous waste harmless resource processing system, which comprises a waste collection cavity, a heat exchanger, a carbonization furnace, a gas-solid separator, a liquid material collection cavity, a gas material collection cavity and a combustion chamber. The multi-phase dangerous waste harmless resource processing system can process various organic dangerous waste, solve the problem of environmental pollution caused by random disposal of waste, and fully realize the reuse of various organic waste. Through the carbonization and pyrolysis process, the organic waste is converted into valuable resources, so that the organic waste is no longer a source of pollution, but a useful resource.

[0004] It is desirable to provide an improved heavy dangerous waste resource processing system, particularly a device for improving copper recovery. SUMMARY

[0005] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a heavy dangerous waste resource processing system, which aims to improve the recovery rate of copper.

[0006] To achieve the above purpose, the utility model adopts the technical scheme: a heavy dangerous waste resource processing system, comprising a batching and brick making system, a smelting and water quenching system, and a flue gas treatment system connected with the smelting and water quenching system. The smelting and water quenching system comprises a smelting furnace, which is arranged to receive solid waste bricks made by the batching and brick making system and form copper matte.

[0007] The flue gas treatment system comprises a gravity dust collector connected with the smelting furnace.

[0008] The flue gas treatment system further comprises a surface cooler connected with the gravity dust collector.

[0009] The flue gas treatment system further comprises a bag filter connected with the surface cooler.

[0010] The flue gas treatment system further comprises a high-temperature oxidation equipment, and the high-temperature oxidation equipment is connected with the bag dust collector.

[0011] The flue gas treatment system further comprises a denitration system, and the denitration system is connected with the heat accumulation type exhaust treatment device.

[0012] The flue gas treatment system further comprises a desulfurization product dehydration system and a wet-type electric dust collector, and the desulfurization product dehydration system is connected with the denitration system.

[0013] The heavy hazardous waste resource treatment system can improve the recovery rate of copper, and precious metals such as gold and silver can be melted in copper, so that the effect of resource recycling is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present specification includes the following drawings, and the shown contents are as follows:

[0015] Figure 1 is a structural block diagram of the heavy hazardous waste resource treatment system of the present application.

[0016] In the drawing, the marks are as follows: 1, a batching and brick making system; 2, a smelting furnace; 3, a gravity dust collector; 4, a surface cooler; 5, a bag dust collector; 6, a high-temperature oxidation equipment; 7, a denitration system; 8, a desulfurization product dehydration system; 9, a wet-type electric dust collector; 10, a flue gas whitening system; and 11, a chimney. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application are further described in detail below with reference to the drawings, and the purpose is to help the technical personnel in the field to have a more complete, accurate and in-depth understanding of the concept and technical scheme of the present application, and to help them to implement.

[0018] As Figure 1 shown, the present application provides a heavy hazardous waste resource treatment system, which comprises a batching and brick making system 1, a smelting and water quenching system, and a flue gas treatment system connected with the smelting and water quenching system, the smelting and water quenching system comprises a smelting furnace 2, and the smelting furnace 2 is arranged to receive solid waste bricks made by the batching and brick making system 1 and form copper matte.

[0019] Specifically, the heavy hazardous waste resource treatment system of the present application can extract copper matte from metal-containing waste. The hazardous solid waste and other auxiliary materials are proportioned, and the by-product copper matte and the intermediate by-product water quenching slag are obtained after brick making and smelting. The water quenching slag can be treated as general solid waste because the glass content is more than 85%. The disposal of waste reduces the loss of heavy metal resources, and avoids the pollution of soil and underground water and the occupation of a large amount of land which may be caused by the ordinary landfill disposal mode.

[0020] The utility model discloses a following technical scheme realizes:

[0021] (1) solid waste receiving;

[0022] The special transport vehicle carrying the dangerous solid waste enters the factory and is weighed by the metering scale arranged at the entrance, first enters the factory area unloading platform and is detected, according to the regulation of the hazardous waste transfer joint sheet management method, first samples the waste, sends the sample to the factory area laboratory and carries out analysis and test or self-test of the production waste unit and submits the test report, then rechecks the test report, at the same time, whether the waste label and the test report are consistent is detected in detail, after each test and recheck meets the project access requirement of the hazardous waste into the factory, the received waste is registered in time, the quantity, weight and other information of the waste into the factory are input into the computer system, and thus the receiving work of the hazardous waste is completed.

[0023] (2) raw material and fuel storage and pretreatment system;

[0024] The property of the heavy hazardous waste is mainly divided into two kinds: the first kind is the mud cake after the filter press is filtered, the water content is 45-60%, ton bag packaging is adopted, and the main is the industrial sludge of electroplating process and other industries. The solid waste of this part is transported by a professional transport unit, after the ton bag solid waste is transported to the factory, the vehicle is parked in the ton bag solid waste unloading hall according to the requirement, the ton bag is unloaded from the vehicle and placed in the specified area through the cooperation of the forklift and the travelling crane. In order to meet the needs of production management, all the solid waste must be analyzed before entering the factory, and is classified and stored according to the analysis data of the main components of the solid waste, and cannot be mixed and stacked. The stored ton bag solid waste is selected according to the regulation and is transported to the specified material pool by the forklift, the ton bag is lifted to the bag breaking platform by the single-arm rotary crane, the solid waste after bag breaking flows into the specified material pool by gravity, and the solid waste in the pool is discharged and homogenized by the travelling crane grab.

[0025] The second kind of sludge is mainly bulk solid waste, the water content is highest 70%, is surface treatment waste, mainly comes from surface treatment enterprises such as electroplating and pickling, HW22 copper-containing waste, mainly includes dust collecting slag, filter press slag or wastewater treatment sludge generated in copper flue gas purification, waste etching liquid and wastewater treatment sludge generated in the copper plate etching process and HW23 zinc-containing waste, HW46 nickel-containing waste, HW48 non-ferrous metal smelting waste and the like generated by other industrial enterprises. After the bulk solid waste enters the factory, enters the bulk solid waste unloading hall, and is directly unloaded into the material pool by the self-unloading vehicle, the solid waste in the pool is discharged and homogenized by the travelling crane grab, and the bulk solid waste also needs to be stored in the specified material pool according to the requirement according to the category and main component.

[0026] For iron powder, carbon, cement, limestone powder and quartz sand and other accessories, by car to the auxiliary material warehouse unloading site, by self-unloading truck auxiliary material into the corresponding storage pit storage.

[0027] (3) batching and brick making system 1;

[0028] The batching and brick making system 1 mainly includes a material pool, a batching bin, a quantitative feeder and a brick making device. The working process of the batching and brick making system 1 is as follows: the classified solid waste and auxiliary materials in the material pool are transported to the batching bin by a grab bucket, the solid waste and auxiliary materials are accurately measured by the quantitative feeder, and then the accurately measured solid waste and auxiliary materials are transported to the brick making device in the mixing and brick making workshop by a belt conveyor, and the solid waste and auxiliary materials are made into solid waste bricks by the brick making device in the mixing and brick making workshop.

[0029] The auxiliary materials mainly play a role in facilitating the bonding of the brick making and increasing the glass phase in the water quenched slag after the subsequent smelting.

[0030] (4) smelting and water quenching system;

[0031] The smelting and water quenching system mainly includes a smelting furnace 2 and a mobile material distribution trolley. The smelting furnace 2 is provided with a mobile material distribution trolley at the upper part. The solid waste bricks and carbon are transported to the top of the smelting furnace 2 by the mobile material distribution trolley. The mobile material distribution trolley is provided with a motor driven part, and the material distribution is controlled by a handle operated by a stoker.

[0032] The feeding part of the smelting furnace 2 is at the top, the discharging part is at the bottom, and air is blown from the side. The molten copper and slag have different specific gravities. The molten copper sinks to the bottom of the smelting furnace 2, and the slag floats on the upper layer of the smelting furnace 2. The molten copper and slag are discharged through different outlets. The slag flows into the slag pit after water quenching by the slag chute, and the molten copper flows into the straight line casting machine for casting production of copper ingots.

[0033] (5) flue gas treatment system;

[0034] As shown in Figure 1 , the flue gas treatment system includes a gravity dust collector 3, a surface cooler 4, an activated carbon injection, a bag dust collector 5, a regenerative high-temperature oxidation device 6, a denitration system 7, a desulfurization product dehydration system 8, a wet-type electric dust collector 9, a flue gas white smoke removal system 10 and a chimney 11. The gravity dust collector 3 is connected with the smelting furnace 2, the surface cooler 4 is connected with the gravity dust collector 3, the bag dust collector 5 is connected with the surface cooler 4, the regenerative high-temperature oxidation device 6 is connected with the bag dust collector 5, the denitration system 7 is connected with the regenerative exhaust treatment device, and the desulfurization product dehydration system 8 is connected with the denitration system 7.

[0035] The amount of flue gas generated in the smelting furnace 2 is 100000 Nm 3h, the initial flue gas dust content is 15 g / Nm 3 , the initial flue gas temperature is 350-500℃, and the moisture content is 5%.

[0036] Gravity dust collector 3: the flue gas of smelting furnace 2 enters the surface cooler 4 after passing through the gravity dust collector 3, the flue gas temperature at the inlet of the surface cooler 4 is 350-500℃, and the flue gas temperature is reduced to 180-200℃ after passing through the surface cooler 4, and an ash bucket and an ash conveying device are arranged below the surface cooler 4.

[0037] Surface cooler 4: the flue gas of smelting furnace 2 enters the surface cooler 4 after passing through the gravity dust collector 3, the flue gas temperature at the inlet of the surface cooler 4 is 350-500℃, and the flue gas temperature is reduced to 180-200℃ after passing through the surface cooler 4, and an ash bucket and an ash conveying device are arranged below the surface cooler 4.

[0038] Activated carbon injection: a set of activated carbon injection system is arranged before the bag dust collector of smelting furnace 2 to remove dioxin, after the activated carbon adsorbs dioxin in the flue gas, it is collected by the bag dust collector 5 to achieve the purpose of removing dioxin.

[0039] Bag dust collector 5: the bag dust collector 5 is a dry dust filtering device. The filter bag is made of woven filter cloth or non-woven felt, which uses the filtering effect of fiber fabric to filter dust-containing gas. When the dust-containing gas enters the bag dust collector, the dust with large particles and high specific gravity is settled down due to the action of gravity and falls into the ash bucket. The gas containing fine dust is filtered through the filter material, and the dust is blocked, so that the gas is purified.

[0040] Heat accumulating high temperature oxidation equipment 6: the temperature of the oxidation chamber is 850-1100℃; the residence time is >2s, so that CO and VOCs in the waste gas are oxidized and decomposed into harmless CO2 and H2O; the heat after oxidation is "stored" by the heat accumulator in the furnace, which is used to preheat the newly entered organic waste gas, thereby saving the fuel consumption required for temperature rise and reducing the operation cost.

[0041] Denitration system 7 is a system that uses a catalyst to reduce the emission of NOx in flue gas by mixing NOx in flue gas with a reducing agent at a certain temperature to generate nitrogen and water, thereby reducing the pollution of flue gas to the environment. The active temperature range of high-temperature catalyst is 320-400℃.

[0042] Desulfurization product dewatering system 8: the desulfurization product dewatering system 8 includes a primary dewatering system, a vacuum belt filter system, a wastewater discharge system and a desulfurization residue storage system. The limestone-gypsum wet flue gas desulfurization process mainly uses cheap and readily available limestone as a desulfurization absorbent. The limestone powder is mixed with water to form an absorbent slurry, in the absorption tower, the stone absorption slurry is mixed with the flue gas, the sulfur dioxide in the flue gas is absorbed and reacts with the calcium hydroxide in the slurry and the oxygenated air blown in, and the final product is gypsum. The desulfurized flue gas passes through the mist eliminator to remove the mist and then enters the chimney for discharge. The equipment is suitable for flue gas desulfurization of various types of industrial furnaces, and has high desulfurization efficiency. The limestone-gypsum wet desulfurization is the most mature and widely used desulfurization process in the world at present.

[0043] Wet type electric dust collector 9: the wet type electric dust collector 9 is a dust removal equipment used for treating trace dust and micro-particles, and is mainly used for removing dust, acid mist, water droplets, aerosol, odor and other harmful substances in the humid gas.

[0044] Flue gas de-whitening system 10: the flue gas de-whitening system 10 is mainly used for reducing the water content in the desulfurized flue gas and eliminating the white water vapor generated due to the condensation of saturated water vapor in the flue gas after discharge. The main equipment of the flue gas de-whitening system includes a de-whitening heat exchanger and a de-whitening fan. When the ambient temperature is 10 DEG C and the ambient humidity is not greater than 80%, no white smoke is generated.

[0045] The flue gas of the smelting furnace 2 is discharged through the chimney 11 after treatment, and the emission limits of particulate matter, sulfur dioxide, nitrogen oxides, dioxins, lead, chromium and cadmium in the part of the flue gas are referred to the table 3 of the GB 31574-2015 Emission Standard of Air Pollutants for Regenerated Copper, Aluminum, Lead and Zinc Industry. The emission of fluorides is executed according to the secondary standard of the GB 9078-1996 Emission Standard of Air Pollutants for Industrial Furnaces. The emissions of HCl and Ni are executed according to the secondary standard of the GB 16297-1996 Integrated Emission Standard of Air Pollutants.

[0046] (6) solid waste treatment water quenching slag;

[0047] In the utility model, the intermediate by-product treated by the smelting furnace 2 is water quenching slag, and the water quenching slag has a glass content of more than 85%. According to relevant specifications, the water quenching slag can be treated as general solid waste.

[0048] According to the GB 5085.1-2007 Hazardous Waste Identification Standard Corrosion Identification, the leaching solution prepared according to the GB / T 15555.12-1995 Solid Waste Corrosion Test Glass Electrode Method is determined to be corrosive if the pH is greater than or equal to 12.5 or less than or equal to 2.0. The pH value of the leaching solution of the smelting water quenching material produced in the above process is not in the range of pH greater than or equal to 12.5 or less than or equal to 2.0, and the smelting water quenching material is not corrosive.

[0049] Referring to the leaching toxicity test results of smelting slag of similar projects, the concentrations of cadmium, chromium, nickel, lead, arsenic, copper and zinc in the leaching solution of the water-quenched smelting slag produced by the above process are all low, and there is no sample exceeding the standard value specified in the Hazardous Waste Identification Standard Leaching Toxicity Identification (GB5085.3-2007), so it has no leaching toxicity.

[0050] Referring to the leaching toxicity test results of smelting slag of similar projects, the glass content of the water-quenched smelting slag obtained by adopting the countercurrent drying + smelting process is greater than 85%. Compared with the Solid Waste Glassification Treatment Product Technical Requirements (GB / T 41015-2021), it is determined that it is a glassy solid waste glassification treatment product, and the mass fraction of the glass body should be not less than 85%, and the water-quenched slag meets the requirements.

[0051] (7) wastewater treatment system;

[0052] The production wastewater is the wastewater generated during the washing process of the ground of the solid waste storage plant and the solid waste conveying vehicle, and the desulfurization wastewater generated by the desulfurization system. The generated wastewater is mixed with solid waste and pumped to the plant area production wastewater treatment system by a wastewater pump. After treatment by the wastewater treatment station, it is sent to the desulfurization system for water replenishment. The wastewater treatment process mainly includes: adjusting tank, reaction tank, clarifier, air flotation tank, pressure filtration, multi-stage filtration and reuse.

[0053] The heavy hazardous waste resource utilization treatment system with the above structure has the following advantages:

[0054] (1) After treatment of the hazardous waste, the copper recovery rate can reach more than 90%, and in addition, precious metals such as gold and silver can be melted in copper, achieving the purpose of resource recovery;

[0055] (2) The glass content of the water-quenched slag after treatment is greater than 85%, meeting the standard requirements, and can be sold as a building material for resource utilization;

[0056] (3) The flue gas meets the emission standard after being treated by the above system;

[0057] (4) The wastewater meets the emission standard after being treated by the above system;

[0058] (5) All the hazardous waste temporary storage warehouses and storage pits are closed, and the gas in the solid waste storage pit is transported to the smelting system high-temperature incineration disposal through a sealed pipeline and a fan. When the furnace is stopped, an activated carbon deodorizing machine is used for disposal. The system can complete the ventilation of the solid waste storage pit and ensure the internal working environment to prevent the leakage of foul gas.

[0059] The utility model has been described exemplarily above in combination with the drawings. Apparently, the utility model is not limited by the above-mentioned mode in the specific implementation. As long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model; or the above-mentioned concept and technical scheme of the utility model are directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. A resource recovery system for heavy hazardous waste, characterized in that: The system comprises a raw material preparation and brick making system, a smelting and water quenching system, and a flue gas treatment system connected with the smelting and water quenching system.

2. The hazardous waste resource recovery system of claim 1, wherein: The flue gas treatment system comprises a gravity dust collector connected with the smelting furnace.

3. The system for resource recycling of hazardous waste according to claim 2, wherein: The flue gas treatment system further comprises a surface cooler connected with the gravity dust collector.

4. The hazardous waste resource recovery system of claim 3, wherein: The flue gas treatment system further comprises a bag filter connected with the surface cooler.

5. The system for resource recycling of hazardous waste according to claim 4, wherein: The flue gas treatment system further comprises a regenerative high-temperature oxidation device connected with the bag filter.

6. The system for resource recycling of hazardous waste according to claim 5, wherein: The flue gas treatment system further comprises a denitration system connected with the regenerative exhaust treatment device.

7. The system for resource recycling of hazardous waste according to claim 6, characterized in that: The flue gas treatment system further comprises a desulfurization product dehydration system and a wet-type electric dust collector, with the desulfurization product dehydration system connected with the denitration system.

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