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GB/T 34640.3-2017 English PDF (GBT34640.3-2017)

GB/T 34640.3-2017 English PDF (GBT34640.3-2017)

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GB/T 34640.3-2017: Classification and recycling and utilization of wrought aluminium and aluminium alloy scraps -- Part 3: Utilization of scraps

This Part of GB/T 34640 specifies the inspection and pretreatment, complexification, casting, and environmental monitoring and discharge of wrought aluminium and aluminium alloy scraps. This Part applies to the utilization of wrought aluminium and aluminium alloy scraps.
GB/T 34640.3-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.120.10
H 69
Classification and recycling and utilization of wrought
aluminium and aluminium alloy scraps -
Part 3. Utilization of scraps
ISSUED ON. SEPTEMBER 29, 2017
IMPLEMENTED ON. APRIL 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Inspection and pretreatment ... 4
4 Utilization principles of scraps ... 5
5 Complexification ... 6
6 Casting ... 6
7 Environmental monitoring and discharge ... 7
Appendix A (Informative) Double-chamber furnace equipment and process
control requirements ... 8
Classification and recycling and utilization of wrought
aluminium and aluminium alloy scraps -
Part 3. Utilization of scraps
1 Scope
This Part of GB/T 34640 specifies the inspection and pretreatment,
complexification, casting, and environmental monitoring and discharge of wrought aluminium and aluminium alloy scraps.
This Part applies to the utilization of wrought aluminium and aluminium alloy scraps (hereinafter known as scraps for short).
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
GB/T 13586 Aluminum and aluminum alloys scraps
GB/T 32186 Test methods of cleanliness of aluminium and aluminium alloy ingots
GB/T 34640.1 Classification and recycling and utilization of wrought
aluminium and aluminium alloy scraps - Part 1. Classification of scraps GB/T 34640.2 Classification and recycling and utilization of wrought
aluminium and aluminium alloy scraps - Part 2. Recycling of scraps
3 Inspection and pretreatment
3.1 Enterprise external scraps
3.1.1 When using recycled scraps, according to GB/T 13586 and GB/T 34640.2, the appearance, type, group, and identification shall be inspected.
5 Complexification
5.1 The equipment and complexification technology used in the
complexification of scraps shall be carried out in a low-oxygen environment as much as possible. During the smelting process, the aluminium liquid shall be fully stirred, to accelerate the melting of the metal, reduce the burning loss, and make the temperature and chemical composition of aluminium liquid more
uniform.
5.2 After the aluminium scrap is complexified, chemical composition analysis shall be carried out; and a report form shall be issued. If used directly, USE aluminium water bag to transport to the production site; and introduce into the smelting furnace. If casted into a complexified ingot, the smelting number, designation, or group shall be identified; and it shall be stored at the designated location. The weight of a single-block complexified ingot shall be 6 kg~20 kg. 5.3 The complexification equipment shall choose double-chamber furnace, environmentally friendly, and small burning loss smelting equipment. The requirements and process control of double-chamber furnace equipment are shown in Appendix A.
6 Casting
6.1 In the case of ingredients, according to the product technical requirements of the processing enterprise and the user?€?s use situations, the process technical document shall be developed by itself, to clarify the use quantity of various scraps.
6.2 It shall use a charging hopper and a charging vehicle for charging the furnace. Heavier scraps shall be added with clamps. Charging shall be
completed at a time as much as possible, to reduce energy loss during the smelting process.
6.3 After the furnace charge is melted, it shall be fully stirred. TAKE samples for on-the-spot quick analysis. According to the detection results, the chemical composition is adjusted. After meeting the standard requirements, furnace refining shall be carried out. LET stand for a period of time before casting begins. 6.4 For aluminium and aluminium alloy ingot products with different quality requirements, according to the use of the scraps, when casting, the
corresponding online purification equipment shall be provided. If necessary, detecting instruments such as online hydrogen measuring, slag measuring can be used, to ensure the internal metal cleanliness of ingot. The cleanliness shall be carried out in accordance with the requirements of GB/T 32186.
Appendix A
(Informative)
Double-chamber furnace equipment and process control requirements
A.1 Double-chamber furnace equipment requirements
A.1.1 Charging system
A.1.1.1 The double-chamber furnace shall have a charging system, including a charging well and a charging machine. In order to facilitate the charging of small-sized scraps through the charging well, the small-sized scraps can be quickly gotten into the aluminium liquid. The aluminium liquid circulation can be realized together with the electromagnetic stirring. The aluminium liquid alloying can be effectively performed.
A.1.1.2 The double-chamber furnace shall be equipped with a special charging machine. The charging machine shall hermetically dock the furnace door, charging desk, and scrap chamber plume trap, to minimize the energy
consumption when the furnace door is opened, and ensure that the flue gas is not discharged into the workshop, reducing environmental pollution.
A.1.2 Scrap chamber
A.1.2.1 The scrap chamber is mainly used for the pretreatment of heavily contaminated scraps. The furnace door shall be provided with a furnace bridge. When charging, the scraps containing water, emulsion, oil, and coating material are placed on the furnace bridge. The scraps are thoroughly dried and fully preheated; and then smelt treated.
A.1.2.2 Near the furnace bridge, flue gas circulating fan and auxiliary heating burner shall be installed. The flue gas circulating fan is used to preheat the furnace bridge scraps by using the scrap chamber flue gas and to send the scrap flue gas into the heating chamber. The auxiliary heating burner is used to keep the temperature of the aluminium liquid in scrap chamber within the set range.
A.1.2.3 The double-chamber furnace shall, through the auxiliary heating burner of scrap chamber, turn the scrap chamber into a weak oxygen atmosphere, ensuring that the scraps in the scrap chamber cannot react with aluminium. Therefore, the metal burning loss can be ensured to be no more than 2%. A.1.3 Heating chamber

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