An alloy of iron and silicon. Ferro silicon is mainly used as a deoxidizer and alloy additive in steelmaking, and is also used in casting, beneficiation, welding rod, light metal industry and as a reducing agent for smelting certain metals. The main raw material for smelting ferro silicon is silica ore (quartz, silica), the Si02 in the ore is generally higher than 96%, the smelting of high-silicon ferro silicon is higher than 98%, the P205 in the ore generally should not exceed 0.02%, AI203 should not exceed 1.5%. The commonly used varieties of ferro silicon contain 45%, 75% and 90% silicon.
Pulverized ferro silicon
In the process of storage and transportation, ferro silicon is easy to powder under certain conditions. This is due to the volume expansion caused by the phase transition of FeSi and FeSiz containing about 34% silicon and 50~60% silicon. Phosphorus, sulfur, calcium, aluminum in the impurities and the humid atmosphere will promote the pulverization of ferro silicon, and it is also easy to cause pulverization when the ferro silicon ingot is slowly cooled due to segregation. The release of gases such as hydrogen, phosphine and hydrogen arsenide during the tridacnization may cause an explosion. The latter two gases are toxic, so the storage and transportation of ferro silicon must be well ventilated to prevent moisture.
Ferro silicon is widely used in steel industry, casting industry and other industrial production. Ferro silicon is an essential deoxidizer in steelmaking industry. Ferro silicon is used for precipitation deoxidation and diffusion deoxidation in steelmaking. Brick iron is also used as an alloying agent in steelmaking. Adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel, improve the permeability of steel, and reduce the hysteresis loss of transformer steel. Low aluminum ferro silicon is a special purpose ferro silicon variety that has appeared in recent years. Its smelting process is complex and the products have high added value. It is the field that the ferro silicon manufacturers actively explore.
1) Adding ferro silicon powder to reduce chromite alloy powder failure rate, the method includes the following steps:
The particle size generated in the crushing process of ferro silicon alloy is 5? 10mm ferro silicon powder as raw material; Ferro silicon powder is added to the hot metal ladle during the ferro chrome alloy baking process, and the amount of ferro silicon powder added is 0.5? 1.0kg/t, when added, 1/3 of the total amount of ferro silicon powder is added when the ferro chrome alloy is baked to 1/4, 1/3 of the total amount of ferro silicon powder is added when the ferro chrome alloy is baked to 1/2, and 1/3 of the total amount of ferro silicon powder is added when the ferro chrome alloy is baked to 3/4.
On the one hand, it can prevent the formation of bubbles, so as to obtain dense iron ingots, which can effectively reduce the rate of ferro chrome powder, improve the production technical and economic indicators of ferro alloy enterprises, and greatly reduce the production cost of ferro chrome alloy. On the other hand, the ferro silicon powder is produced in the crushing process of ferro silicon alloy, which realizes the recycling of resources, meets the requirements of energy conservation and environmental protection, and will not cause environmental pollution and energy waste, and the method is easy to implement, simple and convenient.
2) A ferro silicon ball is prepared, which is made of ferro silicon raw materials and adhesives. The raw materials of ferro silicon are ferro silicon powder or a mixture of ferro silicon powder and metallic silicon powder; The content of silicon in ferro silicon powder is 72-75%, and the content of silicon in metallic silicon powder is 72-85%. The adhesive is made of water, quartz sand, alkali, fluorite, silica powder and micro-silica powder, and its modulus is 3-3.7.
The diameter of the ferro silicon powder ball is 10-80mm. The product is a raw material of ferro silicon, mixed with a binder specially used for the manufacture of the product, using the pelleting mechanism, there is no need to re-furnace smelting, the composition of each substance in the manufacturing process will not change, so it is easy to control the silicon content of the product; The ferro silicon powder and metallic silicon powder used in manufacturing can be made of the powder remaining after the crushing of export products.
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