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
GB/T 34640.3-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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