Treatment method and system for hot metallized pellets

Abstract

The invention discloses a treatment method and system for hot metallized pellets. The treatment method for the hot metallized pellets is disclosed firstly, an alkaline water quenching solution is prepared from a tin stripping waste liquid and carbide slag, and the metallized pellets are subjected to a replacement reaction to generate metallic tin and ferrous ions by the aid of sensible heat produced when the hot metallized pellets are subjected to water quenching in the alkaline water quenching solution; the ferrous ions react with the carbide slag to generate ferrous hydroxide sediment; and subsequently, metallic iron / iron alloy particles, iron oxide red and metallic tin are obtained through treatment such as grinding, magnetic separation, gravity concentration, calcination and the like. The system for implementing the treatment method is further disclosed and comprises a water quenching device for the hot metallized pellets, a grinding device, a magnetic separation device, a gravity concentration grading device, a calcination device and a gravity concentration separating device. With the treatment method and system for the hot metallized pellets, the hot metallized pellets, the carbide slag and the tin stripping waste liquid are utilized comprehensively, and high-quality iron products, the high-quality iron oxide red and the high-quality metallic tin are produced.

Description

technical field [0001] The invention relates to a processing method for hot metallized pellets, and also relates to a processing system for hot metallized pellets, belonging to the technical field of metallurgy. Background technique [0002] Metallized pellets generally refer to roasted products obtained after direct reduction of iron-containing material pellets, in which iron mainly exists in the form of metallic iron or iron alloy (iron in iron alloy exists in the form of metallic iron), so its metallization rate can generally reach 60 %~95%. At present, metallized pellets are processed in two ways. One way is that the hot metallized pellets are directly sent into the smelting furnace, and the molten iron / iron alloy and molten slag are obtained after melting and separation; the other way The metallized pellets are water quenched, crushed, and then separated by grinding and magnetic separation to obtain metal iron / iron alloy particles and tailings. Among them, when the me...

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Problems solved by technology

The current treatment methods for tin stripping waste liquid include neutralization method, chemical precipitation method, electrolysis method, diffusion dialysis-ion membrane electrodeposition combined process, etc., but the production costs of the above methods are relatively high due to the limitations of raw materials and power consumption.

[0004] Chinese Patent Application Publication No. CN 103956487 A discloses a method for preparing lithium iron phosphate by utilizing metallized pellets in a rotary hearth furnace. The metallized pellets are subjected to multiple processes such as crushing, grinding, magnetic separation, grinding, and secondary magnetic separation. treatment, and then use the iron-based alloy, the process is longer; and the invention adopts metallized pellets - grinding - wet magnetic separation - mixing - drying - sintering process, the material has been through high temperature - low temperature - high temperature and dry process - Wet-dry treatment, high energy consumption, so the cost is high; the obtained lithium iron phosphate may also affect its product quality due to impurities brought in by the iron-based alloy

Chinese Patent Application Publication No. CN 101200320A discloses a high-carbon metallized pellet for treating waste water and its preparation method. Carbon-containing materials and iron-containing raw materials are used as raw materials to prepare high-carbon metallized pellets. This method is only applicable to For the treatment of electrolytic filter materials, and in the acidic aqueous electrolyte solution, carbon and iron are used as cathode and anode, and Fe 2+ The reduction of heavy metals and organic pollutants can be realized by the reduction of carbon and carbon, so the treatment effect and production cost are not ideal, and the recovery of valuable elements cannot be realized, so the economic benefit is poor

Chinese patent application publication number CN 104986892A discloses a treatment method for tin stripping waste liquid, including adding sulfate to the tin stripping waste liquid, adjusting the pH value to 1.0-1.5, and then adding polyacrylamide flocculant to recover tin and copper Add ammonia water with a concentration of 18-25% to the wastewater for neutralization to recover copper, and then further treat the wastewater; that is, in different pH systems, due to the different forms of metal ions, they can be separated and recovered step by step. The tin and copper in the tin waste liquid make full use of the resources in the tin stripping waste liquid; but the metal recovered by the invention exists in the form of hydroxide, and its product value is low, and it needs to be carried out under strong acid conditions, and many Neutralization and precipitation are carried out for the first time, so the requirements for equipment are higher

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