GB 29742-2026Safety specification for magnesium and magnesium alloy smelting (English PDF)

6.1 General Requirements

6.1.1 The process of transferring liquid from the entire crucible by hoisting it should not be used.

6.1.2 Safety facilities shall be kept in good working order and shall not be dismantled, misappropriated, disabled, or damaged without authorization; if dismantling or disabling is required for inspection or maintenance, it shall be subject to approval. Approval and temporary protective measures should be taken, and the site should be restored immediately after the work is completed.

6.1.3 Newly constructed or overhauled furnaces should pass inspection and undergo a drying process to ensure the furnace interior is completely dry before being put into production. (Furnace drying) During the process, the condition of the furnace wall should be monitored to ensure that there are no cracks or deformations.

6.1.4 Safety warning signs that comply with GB 2894 shall be installed in places, facilities and equipment with significant risk factors.

6.1.5 When vehicles enter the production site, the surrounding equipment, facilities, and personnel situation should be checked. Vehicle speeds within the factory should comply with GB 4387. Regulation.

6.1.6 Protective, interlocking, and emergency stop devices for mechanical equipment shall be effective and free from defects; exposed rotating or rapidly moving parts of the equipment shall be equipped with safety devices. Full protective shield, guardrail or protective barrier.

6.1.7 Steel ladders, guardrails, and platforms shall comply with the provisions of GB 4053.1, GB 4053.2, and GB 4053.3.

6.1.8 Personal protective equipment shall be provided to workers in accordance with the provisions of GB 39800.1 and GB 39800.3, and workers shall be educated and supervised. Use according to regulations. Personnel in grinding areas should wear self-priming filter-type particulate respirators. This applies to flammable and explosive areas such as gas stations, gas holders, and coal powder preparation areas. Personnel performing the work should wear anti-static clothing.

6.1.9 Areas within the smelting, refining, and ingot casting production processes, as well as those affected by molten metal leaks and splashes, should be free of standing water and should not contain damp materials. Goods and other flammable and explosive materials.

6.1.10 Metallurgical cranes shall be used when hoisting molten metal containers. This applies to hoisting reduction vertical containers and refining (smelting) processes for transporting molten metal. Cast iron pulleys should not be used on heavy machinery, and forged hooks should be used for lifting.

6.1.11 Before the reduction vessel is loaded into the furnace, a pressure test and leak detection shall be carried out in a designated area; during the pressure test, no personnel shall be near the vessel opening.

6.1.12 Operators should not touch the uncooled product directly with their hands, and should not pass over the crucible or slag box.

6.1.13 Damp or undried crude magnesium, magnesium ingots, intermediate alloys, raw materials, or tools should not be directly added to molten metal (molten magnesium, molten alloy, etc.). In the uncooled slag.

6.1.14 Before maintenance and repair work, a risk assessment should be conducted, and maintenance and repair safety measures and emergency response measures should be formulated, especially for work involving confined spaces or other hazardous areas. Hazardous operations should be carried out in accordance with the corresponding operational requirements.

6.2.1 Rotary Kiln

6.2.1.1 The transmission device shall be equipped with a disengagement device for the auxiliary transmission device that can automatically disconnect when the main transmission device is started.

6.2.1.2 The auxiliary transmission device shall be equipped with an independent emergency power supply and braking device.

6.2.1.3 The main drive motor should be interlocked with the lubricating oil supply system of the main reducer.

6.2.1.4 The rotary kiln should be run unloaded before the inner lining is laid, and should not be rotated rapidly between the laying and ignition.

6.2.1.5 Before starting, check and confirm that the kiln lining bricks are not loose or fallen off, and ensure that the rotary kiln and auxiliary equipment are operating normally.

6.2.1.6 When shutting down, the gas supply (coal supply system) should be cut off first, and the kiln temperature should be reduced to below 100°C before shutting down the main motor.

6.2.1.7 Before removing refractory bricks or cleaning the kiln lining inside the rotary kiln, safety measures should be taken to prevent the rotary kiln from reversing, and a dedicated person should be assigned to monitor the process.

6.2.2 Vertical Kiln

6.2.2.1 Gas pipelines, combustion air pipelines, and spray gun cooling air pipelines shall be equipped with pressure and flow monitoring alarm devices. Cooling air pipelines shall be equipped with... Pressure monitoring and alarm devices should be connected to the control room to monitor alarm signals.

6.2.2.2 Gas purging loops and gas reversing valves shall be equipped with high and low pressure monitoring and alarm devices for compressed air and nitrogen, and gas burners shall be equipped with combustion-supporting devices. The low-pressure monitoring and alarm device should be interlocked with the emergency automatic shut-off device for gas pipelines.

6.2.2.3 Fixed oxygen content monitoring and alarm devices should be installed on each platform at the top of the kiln, and fixed combustible gas concentration monitoring devices should be installed on the kiln spray gun layer and discharge platform. The kiln should be shut down via interlocking when the alarm limit is reached by the monitoring and alarm device.

6.2.2.4 When igniting, it should be checked and confirmed that the kiln connection channel is under negative pressure, and combustion air should be introduced first, followed by gas before ignition.

6.2.2.5 The kiln body shall be equipped with an explosion relief device.

6.2.2.6 Personnel should not enter the area under the single-bucket inclined bridge.

6.2.2.7 The ignition hole should be cleaned under negative pressure.

6.2.2.8 No inspection holes should be opened during normal operation of the vertical kiln.

6.3.1 Crushed

6.3.1.1 Before starting the machine, clear away any debris around the crusher and check that all fasteners are secure and not loose or missing. Then follow the crusher start-up procedure. operate.

6.3.1.2 No one should stand within the rotation area of the jaw crusher during operation.

6.3.1.3 During operation, the diameter of the material to be crushed should not exceed

0.85 times the feed opening of the crusher. If material jamming or abnormal noise occurs, immediate action should be taken. This means shutting down the system.

6.3.1.4 Before shutting down, the material inside the crusher should be emptied.

6.3.2 Ingredients

6.3.2.1 During operation, the following start-up sequence should be followed. belt conveyor - belt scale - electric vibrator; when stopping, the material on the belt conveyor should be emptied.

6.3.2.2 When using an automatic batching process, a calcined white silo level monitoring and alarm device and the following interlocking devices should be installed.

a) The batching line and the belt conveyor are interlocked for start/stop operation;

b) The calcined white silo material level monitoring and alarm device is interlocked with the finished product feeder.

6.3.3 Ball milling

6.3.3.1 Before starting the ball mill, the following requirements must be met.

a) During the initial test run or restart after a long period of inactivity, ensure that safety facilities such as guardrails and motor guards are intact, and check the hollow journal. Add mechanical lubricating oil, manually rotate the machine or use a special rotating device to rotate it one full turn to confirm there is no obstruction;

b) The ball mill cylinder, liners, grinding balls, feed inlet, discharge outlet, transmission device, and other components should be inspected to ensure there is no looseness, wear, or blockage. question;

c) Remove any debris that may obstruct the operation of the ball mill, and ensure that the electrical, lubrication, and cooling systems are in good working order;

d) Check and confirm that there is no one inside or around the ball mill, contact the relevant work positions and obtain a signal of permission to start before starting.

6.3.3.2 The oil level and coolant level of the main bearing should be checked daily to confirm that the coolant circulation is normal.

6.3.3.3 Personnel shall not pass or pass objects under a running ball mill.

6.3.3.4 During operation, do not touch rotating parts, do not put hands or other objects into the ball mill, and do not arbitrarily change equipment parameters. Count or disassemble parts.

6.3.4 Pressing the ball

6.3.4.1 Before starting the machine, clean up the debris around the briquetting machine, check to ensure that all fasteners are not loose or have fallen off, and remove any loads.

6.3.4.2 During the trial run, use the jogging method to make the motor rotate with pulses. After confirming that there are no abnormalities, start the briquetting machine.

6.3.4.3 When feeding materials, ensure that the electric feeder feeds materials evenly, and adjust the electric feeder to the best effect according to the silo pressure. ...