Preprocessing method of raw materials for ferrosilicon smelting

Abstract

The invention relates to the smelting technology, in particular to silicon iron smelting raw material and a preprocessing method. The preprocessing method comprises the following steps: firstly, silicon contained raw material is mixed with the carbonaceous reducing agent according to a certain ratio; secondly, a 40 to 80 mm oval or oblate pellet is pressed into form through a mechanical way; thirdly, after drying, the percentage of moisture is controlled for less than two percent, and then the raw material can be used as silicon iron smelting raw material. The silicon iron smelting raw material and the preprocessing method have the advantages that the raw material resource is rich, the price is inexpensive, and the energy saving effect is obvious, simultaneously, because a great amount of , the silicon fine powder and siliceous colliery waste are adopted by the technology, the social benefit and the environmental benefit are quite good.

Description

technical field [0001] The invention relates to smelting technology, in particular to raw materials for ferrosilicon smelting and a pretreatment method thereof. Background technique [0002] At present, the production of ferrosilicon all use silica sand, steel scraps and coke particles or blue carbon as raw materials, and add it to the submerged arc furnace to generate ferrosilicon at above 1700 ℃. When using this process to produce ferrosilicon, in order to ensure the air permeability of the submerged arc furnace material surface, the particle size of silica sand, coke particles or blue carbon is required to be relatively large, the particle size of silica is generally 40-120mm, the particle size of coke is generally 4-18mm, The contact interface area with coke particles or blue carbon and steel chips is small, the reaction speed is slow, and the smelting unit consumption is high. [0003] In order to solve the above-mentioned problems, China Intellectual Property Office p...

AI Technical Summary

Problems solved by technology

[0004] First: When using the above-mentioned patented technology and similar inventions for ferrosilicon smelting and production, it is necessary to spend hundreds of thousands of yuan to carry out major technical transformation of the existing smelting furnace

Second: In order to meet the needs of users for different types of ferrosilicon, firstly adjust the amount of iron in the pellets several days in advance, and then make pellets, which is very poor in operability for large-scale production

Third: Iron materials are added to the pellets, which greatly reduces the high-temperature refractoriness and high-temperature strength of the pellets. The pellets will be quickly broken and melted prematurely in the submerged arc furnace, which will reduce the furnace charge air permeability

Fourth: The particle size of the component materials in the batching is powder, which reduces the high-temperature refractoriness of the pellets, and the high-temperature strength of the pellets cannot meet the requirements of the ferrosilicon smelting process

Fifth: The listed organic binder loses its bonding effect at 300-600 degrees, which cannot meet the requirements of ferrosilicon smelting process

In short, this patented technology cannot be applied in actual production at all.