SR Smelting Furnace

This article is reprinted from Sanrui Electric Furnace's " Characteristics of DC Submerged Arc Furnace For Smelting ".

An AC electric arc furnace is a device that uses an electric arc for heating. Its core principle is to convert electrical energy into heat by generating an electric arc between electrodes. For example, a typical AC EAF might have a transformer capacity of up to 64 MVA, a furnace shell diameter of 6200 mm, an electrode diameter of 550 mm, a smelting time of 63 minutes, a power consumption of 370 kWh/t, and dust emissions of 20 mg/m³. The design features of an AC EAF are mainly reflected in its structure, operation method, and performance optimization. Below are some key design features to explore. Basic Principles of AC Electric Arc Furnaces AC EAF use a high-temperature electric arc to heat raw materials such as cast iron, steel, and scrap steel, melting the metal and enabling processes such as smelting, remelting, and alloying. The power supply is typically a high-voltage (e.g., 10–35 kV) or medium-voltage AC system with frequency conversion/rectification followed by inversion, output...

  LRF is a crucial piece of equipment in secondary metallurgy for steelmaking. It is primarily used to refine and temperature-regulate molten steel produced in primary refining furnaces (such as electric arc furnaces and converters) to improve steel quality. Its main uses can be summarized as: deep refining, precise adjustment, and temperature control of molten steel after primary refining, providing high-quality, homogenized steel for continuous casting. It is not used for melting metal, but rather for quality improvement and process buffering before casting, meeting the requirements of continuous casting and rolling. Functions and Uses of LRF 1. Deep Desulfurization & Deoxidation Desulfurization: The ladle refining furnaces possesses a highly reducing slag system (high basicity, low oxidizing power), enabling efficient desulfurization, reducing sulfur content to below 0.005%, meeting the extremely low sulfur content requirements of high-quality steels (such as pipeline steel ...

  Electric arc furnace steelmaking is a steelmaking method that uses electricity as a heat source, heating and melting metal through an electric arc generated between graphite electrodes and the furnace charge.  This method allows for precise control of the furnace atmosphere and strong control over the steel composition, enabling the production of not only ordinary carbon steel but also special alloy steels such as tool steel and spring steel. Steelmaking electric furnaces can also be used to smelt iron ore, making them widely applicable in steel production. Therefore, they have relatively flexible requirements for raw materials, but the characteristics of the raw materials directly affect smelting efficiency, steel quality, energy consumption, and production costs. The main requirements are as follows: Raw Material Requirements for Electric Arc Furnace Steelmaking 1. Types & Forms of Raw Materials Scrap Steel: The main raw material, typically accounting for 70%-100%. Cle...

Submerged arc furnace melting silicon also known as electric submerged arc furnaces smelting of metallurgical-grade silicon, is the most important method for industrial silicon production (Si content typically 98.5% ~ 99.7%). Essentially, it involves a strongly endothermic chemical reaction in which silicon dioxide (SiO₂, mainly derived from quartz or silica) is reduced using a carbonaceous reducing agent (such as petroleum coke, charcoal, coal, etc.) under high temperature and a reducing atmosphere. Submerged Arc Furnace Melting Silicon 1. Silica (Quartz):  The core raw material. High SiO₂ content (>99%), low impurity content (Al, Fe, Ca, etc.), suitable particle size (typically 50-150mm), and thermal stability (to avoid high-temperature cracking) are required. 2. Reducing Agents: Petroleum coke:  Most commonly used, high fixed carbon content, few impurities, but relatively poor reactivity. Charcoal:  Good reactivity, high porosity, but expensive and low strength. Bit...