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GB/T 32965-2025Technical specification for processing and metal recovery of steel slag (English PDF)

钢渣加工和金属回收技术规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 32965-2025 is the English-translated version of 钢渣加工和金属回收技术规范.

GB/T 32965-2025 is the Chinese national standard covering a steel slag processing line and what it recovers — the separate handling of desulfurisation slag, converter slag, electric arc furnace slag and refining residue, the dust extraction and the boundary noise, the crushing and magnetic separation equipment, the drop hammer for lumps too big to feed a crusher, the automation and the start-up order, and the iron content of the recovered magnetic powder and slag steel. Whether the line has done its job shows in how much metallic iron is left in the tailings. It replaces GB/T 32965-2016, under the China Iron and Steel Association. In force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026, replacing GB/T 32965-2016.

Document preview — GB/T 32965-2025

National Standard of the People's Republic of China

ICS: 77.140.99
Classification: H 34
Replacing: GB/T 32965-2016

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.1 steel slag processing
3.2 steel slag tailings
4 General Requirements
5 Processes and Equipment
5.1 Basic Process
5.2 Process Flow
5.3 Design Requirements
5.4 Crushing Equipment
5.5 Magnetic Separation Equipment
5.6 Requirements for Drop Hammer and Cutting of Large Steel Slag
6 Automation Requirements
6.1 Design Principles
6.2 System Operating Platform
6.3 Operational Control Requirements
7 Requirements for Metal Recycling Products

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

This document replaces GB/T 32965-2016 "Technical Specification for Metal Recovery and Treatment in Steel Slag". Compared with GB/T 32965-2016, except for...

Aside from structural adjustments and editorial changes, the main technical changes are as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of the 2016 edition);

b) Terms and definitions have been changed (see Chapter 3, Chapter 3 of the 2016 edition);

c) General requirements have been added (see Chapter 4);

d) The principle and process of the dry process for steel slag have been modified (see 5.2, 4.1 and 4.2 in the 2016 version);

e) The principles and process flow of wet treatment have been removed (see sections 5.1 and 5.2 of the 2016 edition);

f) Increased automation requirements (see Chapter 6);

g) Changes were made to the steel slag processing and metal recycling processes (see Chapter 7, 5.3 of the 2016 edition);

h) Requirements for recycled metal products have been added (see Chapter 7);

i) Increased material storage and transportation (see Chapter 8);

j) The determination of total iron content in magnetically separated powder has been added (see Appendix A);

k) The determination of total iron content in slag steel has been added (see Appendix B).

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Iron and Steel Association.

This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).

This document was drafted by: China Metallurgical Construction Research Institute Co., Ltd., Shougang Group Qian'an Iron & Steel Co., Ltd., Shandong University, and China Metallurgical Energy Conservation and Environmental Protection Group Co., Ltd.

Baoding Limited Liability Company, Shandong Iron and Steel Group Yongfeng Lingang Co., Ltd., Shihong Special Steel Group Co., Ltd., Metallurgical Industry Information and Standardization Research Institute Nanyang Hanye Special Steel Co., Ltd., Hangzhou Xiruidi Technology Co., Ltd., Anyang Iron and Steel Group Comprehensive Utilization and Development Company, Jiangsu Binxin Steel Group Limited, Dahuan Group Limited, Beijing University of Science and Technology, Lingyuan Iron & Steel Co., Ltd., Hubei Jinshenglan Metallurgical Group Co., Ltd.

Company, Hebei Puyang Iron & Steel Co., Ltd., Nanjing Iron & Steel Co., Ltd., Guangxi Beigang New Materials Co., Ltd., China Metallurgical Testing & Certification (Shanghai) Co., Ltd.

Limited Company, Anhui University of Technology, China Metallurgical Southern Urban Environmental Protection Engineering Technology Co., Ltd., Jiangsu Keda Heavy Industry Co., Ltd., Hangzhou Rui Kunming Information Technology Co., Ltd., and Deqing Taixin Metal Products Co., Ltd.

The main drafters of this document are: Lü Wen, Zhang Liangliang, Chang Jingcai, Peng D, Zhang Song, Du Hongtao, Hao Yidang, Xu Shaopu, Qiu Jinhui, and Liu Yuanzheng.

Yu Zhigang, Huang Huifang, Yan Caixia, Wang Yong, Sun Yonglin, Qi Baoxiang, Gao Zhaohai, Zhao Hu, Wang Haitao, Gao Haiquan, Liu Jingdong, Su Wei, Chen Jian Zuo Junjie, Wang Jiangwei, Hai Zhili, Zhang Ruopeng, Han Shiguo, Hao Dechang, Zhang Xu, Liu Gengsheng, Lin Tao, Yao Lijun, Yang Jue, Zhang Lianhang, Wang Xiaojie Zhang Yalin, Guo Xueyu, Li Jianchun, Li Bingji, Yu Jingyao, Liu Changliang, Zhang Yuanchun, Xu Yong, Zuo Shuai, Zhang Xingzhou, Chen Wenhao, Zhang Lichao, You Dajun Yu Wenbin, Liu Peilan, Nie Haijin, Cheng Weihua, Wu Yuedong, Zhang Ruichao, Qian Baineng, Chen Jiatiao, Wang Kun, and Du Gang.

The previous versions of this document and the document it replaces are as follows.

— First published in 2016 as GB/T 32965-2016;

— This is the first revision.

1 Scope

This document specifies the general requirements, processes and equipment, automation requirements, metal recycling product requirements, and material requirements for steel slag processing and metal recycling. Storage and transportation.

This document applies to desulfurization slag from molten iron pretreatment, converter steel slag, electric arc furnace steel slag, and refining casting residue (excluding stainless steel slag).

2 Normative references

GB/T 208

GB/T 8170

GB/T 10322.1

GB 12348

GB 28664

GB/T 30897

GB/T 30898

3 Terms and Definitions

The terms and definitions defined in YB/T 804 and the following terms and definitions apply to this document.

3.1 steel slag processing

The process of separating cold steel slag into slag steel, magnetic powder and tailings through crushing, screening and magnetic separation.

3.2 steel slag tailings

The residue after steel slag has been processed and metals have been recycled.

4 General Requirements

4.1 Steel slag processing and metal recycling should adhere to the principles of safe production, environmental protection, and resource utilization of solid waste, and adopt advanced and feasible methods.

An economical, environmentally friendly, and energy-saving treatment process.

Pollution prevention measures should be taken, such as preventing dust, runoff, and leakage.

4.3 The noise level at the boundary of the steel slag processing and metal recycling production line (hereinafter referred to as the steel slag processing line) shall meet the requirements of GB 12348.

4.4 Desulfurization slag from molten iron pretreatment, converter slag, electric arc furnace slag, and refining casting residue should be temporarily stored separately. Steel slag tailings should be piled up and stored separately.

Store them for easy classification and utilization.

4.5 Desulfurization slag from molten iron pretreatment, converter slag, electric arc furnace slag, and refining casting residue should preferably be processed on separate slag processing lines. If the same steel...

For slag processing lines, it is advisable to feed and process materials in different time periods.

4.6 Dust removal measures should be installed in areas where dust is generated during steel slag processing lines. The emission concentration limits for air pollutants should comply with the requirements of GB 28664.

The dust concentration at the workplace must comply with GB 28664 regarding fugitive particulate matter emissions from production workshops with or without complete factory buildings.

Concentration limit requirements.

5 Processes and Equipment

5.1 Basic Process

After the steel slag is cooled to a suitable moisture content in the stockpile, it undergoes screening, coarse crushing, magnetic separation, and fine crushing to remove metallic materials, forming slag.

Products include steel, magnetic separation powder, and tailings. Large lumps of steel slag are processed and metals are recovered using drop hammer and cutting methods.

5.2 Process Flow

Steel slag is dumped onto a 150mm vibrating feed screen by a loader or grab bucket via a crane. Larger pieces on the screen are then magnetically separated by an electromagnetic chuck.

Large magnetic materials are fed by a loader to a jaw crusher for coarse crushing, and then pass through a magnetic separator along with materials that have passed through a 150mm screen for magnetic separation.

Iron is removed by magnetic separation to extract slag and steel. After magnetic separation in the iron remover, the material is separated into oversize ( >10 mm) and undersize by a 10 mm vibrating screen.

(< 10mm), the material over the 10mm sieve is further crushed and de-ironized using an iron remover, and then enters a rod mill for fine crushing and iron removal. The material under the 10mm sieve is then separated by magnetic separation.

It is divided into magnetically separated powder and tailings. The process flow is shown in Figure 1.

Figure 1.Process flow diagram of steel slag processing and metal recycling

5.3 Design Requirements

The design requirements are as follows.

a) The areas of the raw material storage yard, finished product storage yard, and tailings storage yard of the steel slag processing line should meet the storage period requirements;

b) Based on process requirements and actual on-site production conditions, the entire steel slag processing line should be divided into multiple processes, and the design should include steps between each process.

In a storage yard or silo, when a certain process or piece of equipment malfunctions, it will not affect the normal production of other processes.

5.4 Crushing Equipment

Jaw crushers can be used for primary crushing. Rod mills can be used for secondary crushing.

5.5 Magnetic Separation Equipment

Magnetic separation equipment includes electromagnetic chucks, electromagnetic iron removers, and magnetic separators.

5.6 Requirements for Drop Hammer and Cutting of Large Steel Slag

The requirements are as follows.

a) Large pieces of steel slag exceeding 500mm should be processed using drop hammer cutting and cutting techniques;

b) The drop hammer chamber for steel slag drop hammer treatment should have a reliable enclosure structure to prevent scrap steel from scattering, and necessary safety measures should be taken;

c) Cutting of large lumps of steel slag should be carried out in an enclosed space, with a gas collection hood and dust removal facilities installed.

6 Automation Requirements

6.1 Design Principles

6.1.1 The automated control of the steel slag processing line should establish an integrated system of on-site control, process monitoring, and computer management to complete the overall automation control.

Automatic monitoring and control of all production equipment during the entire process.

6.1.2 The design of automated control systems should adhere to the principles of "advanced, reliable, and practical," adopting a "distributed control, centralized management" model.

Starting from the production process, automatic control of equipment is achieved, and the central monitoring computer statistically analyzes and processes information throughout the entire production control process. Reason, etc.

6.2 System Operating Platform

6.2.1 The system operating platform should be equipped with both Type 1 and Type 2 master stations. Type 1 master stations should use programmable logic controllers (PLCs). Type 2 master stations should use...

When using an industrial control computer, communication and data exchange with a Class 1 master station should be achieved through industrial Ethernet.

6.2.2 Through configuration, human-machine dialogue should be realized to complete the control of field equipment and process monitoring.

6.2.3 Online monitoring equipment should be installed at the emission outlet of dust removal equipment to record the main parameters of the enterprise's environmental protection facilities operation and related production processes.

6.3 Operational Control Requirements

6.3.1 The equipment operation mode should be set to three types. local manual, main control manual, and main control automatic. The selector switch is located at the machine. Equipment maintenance or debugging.

The phased operation adopts "manual operation at the machine" and "manual operation by the main control", while the "automatic operation by the main control" mode is used under normal production conditions.

6.3.2 The steel slag processing line involves two upstream and downstream processes. The downstream equipment should be started first, followed by the upstream equipment; when stopping, the upstream equipment should be stopped first.

Downstream equipment can only be stopped after the upstream process is completed. The steel slag processing line has parallel processes that can be started and stopped simultaneously.

7 Requirements for Metal Recycling Products

7.1 The total iron content of magnetic separation powder for metal recycling products shall comply with the provisions of GB/T 30897, and the total iron content of slag steel shall comply with the provisions of GB/T 30898.

As stipulated in the regulations or contract, the determination of total iron content in magnetic separation powder shall be carried out in accordance with Appendix A, and the determination of total iron content in slag steel shall be carried out in accordance with Appendix B.

7.2 The metallic iron content in steel slag tailings should not exceed 2%, and the determination of metallic iron content shall be carried out in accordance with YB/T 4725.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 10322.1 · GB 12348 · GB 28664

Editions of GB/T 32965

Edition	Title	Revision	Status
GB/T 32965-2025	Technical specification for processing and metal recovery of steel slag	current edition	Current
GB/T 32965-2016	Technical specifications on metal recovery of steel slag	previous edition	In force

This page sells the current edition, GB/T 32965-2025. Earlier editions are listed for reference only.

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