CN-121992192-A - Sludge ore blending sintered material and sintered pellets for steel works, and manufacturing method and application thereof

Abstract

The invention discloses a sludge ore blending sintered material and sintered pellets for steel works, and a manufacturing method and application thereof. The invention relates to a sludge ore-blending sintering material for a steel plant, which comprises a sintering raw material, steel sludge and an SCR catalyst, wherein the addition of the steel sludge and the SCR catalyst respectively accounts for 1-3% and 0.1-0.4% of the total weight of the sintering raw material. By adopting the technical scheme of the invention, the influence of S, N and other elements in the sludge of the steel plant on the emission of the sintering flue gas pollutants can be effectively avoided, the recycling of the waste SCR catalyst can be realized, and the treatment cost is reduced.

Inventors

• HU YAN
• LIU JIANPING

Assignees

• 宝山钢铁股份有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (9)

1. 1. The sludge ore blending sintering material for the steel plant is characterized by comprising sintering raw materials, steel sludge and a catalyst, wherein the catalyst adopts an SCR catalyst, the addition amount of the steel sludge accounts for 1-3% of the total weight of the sintering raw materials, and the addition amount of the SCR catalyst accounts for 0.1-0.4% of the total weight of the sintering raw materials.
2. 2. The sludge ore blending sintered material of steel plant according to claim 1, wherein the sintered raw materials include iron ore powder, return ore, flux and sintered fuel.
3. 3. The sludge ore blending sintering material for the steel plant according to claim 2, wherein the mass percentages of the raw materials for sintering are 60% of mixed ore, 15-17% of return ore, 5-6% of sintering powder, 4.5-5% of dolomite, 2.5-3% of limestone, 1.5-2% of external dust and 3.5-4% of coke powder.
4. 4. The sludge mineral aggregate of steel works according to claim 1, wherein the particle size of the SCR catalyst is 0.9-1.1mm, and the SCR catalyst is waste SCR catalyst.
5. 5. A steel plant sludge ore blending sintered pellet, characterized in that the raw material of the sintered pellet comprises the sintered pellet as claimed in any one of claims 1 to 4.
6. 6. The steel plant sludge ore blending sintered pellet as claimed in claim 5, wherein the inner layer of the sintered pellet is a pellet formed by mixing a sintering raw material with steel sludge, and the outer surface of the sintered pellet is adhered with waste SCR catalyst particles.
7. 7. The manufacturing method of the sludge ore blending sintered pellets in the steel plant is characterized by comprising the following steps of: A1, raw materials are mixed, sintering raw materials are mixed with steel sludge in a contact way, and the mixture is subjected to primary balling treatment to obtain sintering material pellets; a2, mixing and forming, namely adding a waste SCR catalyst into the sintering pellets, enabling the catalyst to be in contact and mixing with the sintering pellets, and performing secondary balling treatment on the catalyst to enable the waste SCR catalyst to be wrapped on the surfaces of the sintering pellets; a3, sintering and forming, namely performing ignition sintering on the sintered material pellets coated on the surface to obtain the formed sintered ore.
8. 8. The method for manufacturing sludge ore blending sintered pellets in steel works according to claim 7, further comprising the steps of; b1, continuously introducing water for 6-8min during the first balling treatment in the step A1, wherein the water added in the period accounts for 7.3-7.7% of the total mass of the mixture; b2, mixing the sintered material pellets with the waste SCR catalyst for 50-70s during the second balling treatment in the step A2.
9. 9. The use of sludge ore blending sintered pellets in steel works as claimed in claim 5 or claim 6, comprising the steps of, in the sintering forming, laying a layer of sintered return ore as a base material at the time of sintering, and then laying sintered pellets on the base material.

Description

Sludge ore blending sintered material and sintered pellets for steel works, and manufacturing method and application thereof Technical Field The invention relates to the technical field of solid waste recycling of steel sludge, in particular to a sludge ore blending sintered material and sintered pellets of a steel plant, and a manufacturing method and application thereof. Background Besides main processes of iron making and steel making, the steel production process also comprises auxiliary process flows which play an important role in the production process, but also generate a large amount of sludge solid waste. For example, acid-base neutralization sludge may be generated during acidic or alkaline wastewater treatment, and biological treatment units in wastewater treatment systems may form biological sludge, including ferric oxide sludge, continuous casting sludge, and the like. The content of iron and carbon elements in the sludge in the steel plant is higher, and the sludge has a certain recovery value and is a potential resource. Along with the continuous strict requirements of industrial solid waste reduction, reclamation and harmless disposal of solid waste environmental pollution control methods, more and more iron and steel enterprises develop a solid waste recycling mode, namely solid waste generated in iron and steel plants is disposed and utilized in the internal production flow process, so as to accord with the sustainable development concept. The steel sludge is a metal resource and has a certain heat value, so that the steel sludge is a potential available material. The sintered ore has high yield, and the subsequent blast furnace smelting has high tolerance to harmful elements and obvious advantage in treating sludge with complex components, so that the prior art has studied to apply the steel sludge to the sintering process. In the prior art, the patent document with the application number of CN202210073627.4 discloses a process for using stainless steel pickling sludge as iron ore concentrate sintering ingredients, wherein the stainless steel pickling sludge is dried and crushed, then is mixed with the dried iron ore concentrate, the crushed limestone powder, the crushed quicklime and the crushed sintering fuel, the mixed material is added with water and granulated, then is paved on a sintering machine trolley, the sintering fuel in the material is combusted and reduced, the mixed material can be heated and sintered, the high-temperature sintering material is crushed and screened after being discharged from the sintering machine, and the sintering ore with the granularity of more than 5mm is cooled and then is used as a blast furnace raw material. According to the invention, the stainless steel pickling sludge is used as an iron concentrate sintering ingredient, the product quality and the molten iron quality of the sinter are not influenced, the sinter with stable chemical components, good physical properties and certain air permeability is obtained, and the efficient utilization of valuable elements in the stainless steel pickling sludge in iron and steel enterprises is realized; The patent document with the application number of CN20161026585. X discloses a method for treating sludge by utilizing a metallurgical sintering process, which comprises the following steps of (A) a sludge pretreatment step of dehydrating sludge, (B1) a non-free water removal step of mixing and reacting quicklime with the dehydrated sludge to obtain a sludge mixture, (C1) a batching step of mixing the obtained sludge mixture with other raw materials uniformly to obtain a sintering mixture, (D) a uniform mixing granulation step of mixing the sintering mixture by a mixer for one time and two times to obtain a sintering mixture, and (E) a sintering step of placing the sintering mixture into a sintering machine trolley for sintering. The invention utilizes the effective chemical components in the municipal sludge and the ferrous metallurgy dust for metallurgical sintering to realize the resource utilization; The patent document of CN201010502999.1 discloses a utilization method of municipal sludge as a raw material of sintered ore in the steel industry, belonging to the technical field of harmless disposal and high added value utilization of municipal solid waste. Mixing urban sludge and quicklime in proportion, drying and dehydrating to obtain calcified sludge, mixing the calcified sludge with sintering raw materials with correspondingly adjusted components according to a certain proportion and a certain mode, and carrying out sintering process treatment along with other sintering raw materials to finally produce sintered mineral products which are used as iron-making raw materials. The method has the advantages that the method reduces the treatment cost of the sludge by adding lime calcified municipal sludge, controls the secondary pollution problem in sludge treatment, realizes harmless treatment and recycling