阅读说明：本技术 一种新型顶渣改质剂的制备方法 (Preparation method of novel top slag modifier ) 是由 刘超群 于 2019-12-03 设计创作，主要内容包括：本发明属于炼钢技术领域,具体涉及一种新型顶渣改质剂,包括以下步骤：(1)精选、分类：回收钢厂废渣,并按含钢量进行分类；(2)破碎：将分类好的废渣放入破碎机中,破碎成适宜粒径的渣粉；(3)搅拌：称取适量的渣粉,加入辅料和添加剂,混合搅拌均匀,得到半成品；(4)成球：将半成品放入造球机中制作为适宜大小的球团；(5)包装：将球团进行包装得到成品。(The invention belongs to the technical field of steel making, and particularly relates to a novel top slag modifier, which comprises the following steps: (1) selecting and classifying: recovering the steel mill waste residues and classifying according to the steel content; (2) crushing: putting the classified waste residues into a crusher, and crushing the waste residues into residue powder with a proper particle size; (3) stirring: weighing a proper amount of slag powder, adding auxiliary materials and additives, and uniformly mixing and stirring to obtain a semi-finished product; (4) balling: putting the semi-finished product into a pelletizer to make pellets with proper size; (5) packaging: and packaging the pellets to obtain a finished product.)

1. The preparation method of the novel top slag modifier is characterized by comprising the following steps of:

selecting and classifying: recovering the steel mill waste residues and classifying according to the steel content;

crushing: putting the classified waste residues into a crusher, and crushing the waste residues into residue powder with a proper particle size;

stirring: weighing a proper amount of slag powder, adding auxiliary materials and additives, and uniformly mixing and stirring to obtain a semi-finished product;

balling: putting the semi-finished product into a pelletizer to make pellets with proper size;

packaging: and packaging the pellets to obtain a finished product.

2. The preparation method of the novel top slag modifier according to claim 1, wherein the total addition amount of the auxiliary materials and the additives is 1.5-2.5kg/t, and the mass ratio of the auxiliary materials to the additives is 3: 1.

3. The preparation method of the novel top slag modifier according to claim 2, wherein in the step 3, the auxiliary materials comprise aluminum and aluminum oxide, and the mass ratio of the auxiliary materials is as follows: aluminum: aluminum oxide = 0.8: 9.2.

4. the preparation method of the novel top slag modifier according to claim 3, wherein the median particle sizes of the aluminum and the aluminum oxide are both 15 +/-2 mm.

5. The preparation method of the novel top slag modifier according to claim 2, wherein the additive comprises the following components in percentage by mass: calcium oxide: calcium carbonate = 8: 2.

6. the preparation method of the novel top slag modifier according to claim 5, wherein the particle sizes of the calcium oxide and the calcium carbonate are both 20-35 mm.

7. The method for preparing the novel slag pushing modifier according to claim 1, wherein in the step 4, the pelletizer is a disc pelletizer, a pelletizing liquid is further added into a semi-finished product in the disc pelletizer, and the addition amount of the pelletizing liquid is 12.8% of the mass of the semi-finished product.

8. The preparation method of the novel top slag modifier according to claim 1, wherein in the step 2, the granularity of the slag powder is 5 +/-2 mm.

Technical Field

The invention belongs to the technical field of steel making, and particularly relates to a preparation method of a novel top slag modifier.

Background

During the tapping process of a primary smelting furnace (a converter or an electric furnace), some high-oxidizing slag is inevitably brought in, and on one hand, the high-oxidizing slag can cause alloy loss in the alloying process, and meanwhile, the dissolution probability of refractory materials is increased, and serious secondary pollution is caused to molten steel; on the other hand, the ladle top slag contains higher FeO and MnO, and the recovery of metal resources in the top slag can also increase certain economic benefit. The use of the ladle top slag modifier can reduce the oxidability of the ladle top slag, improve the alkalinity of the slag and improve the capability of the top slag for absorbing impurities, and is an important means for smelting pure steel. The existing top slag modifier has high production cost and poor nitrogen-increasing comprehensive smelting effect.

Disclosure of Invention

The purpose of the invention is realized by the following technical scheme:

the invention provides a preparation method of a novel top slag modifier, which comprises the following steps:

(1) selecting and classifying: recovering the steel mill waste residues and classifying according to the steel content;

(2) crushing: putting the classified waste residues into a crusher, and crushing the waste residues into residue powder with a proper particle size;

(3) stirring: weighing a proper amount of slag powder, adding auxiliary materials and additives, and uniformly mixing and stirring to obtain a semi-finished product;

(4) balling: putting the semi-finished product into a pelletizer to make pellets with proper size;

(5) packaging: and packaging the pellets to obtain a finished product.

Furthermore, the total adding amount of the auxiliary materials and the additives is 1.5-2.5kg/t, and the mass ratio of the auxiliary materials to the additives is 3: 1.

Furthermore, the auxiliary material comprises aluminum and aluminum oxide, and the auxiliary material comprises the following components in percentage by mass: aluminum: aluminum oxide = 0.8: 9.2.

furthermore, the median particle sizes of the aluminum and the aluminum oxide are both 15 +/-2 mm.

Further, the additive comprises the following components in percentage by mass: calcium oxide: calcium carbonate = 8: 2.

furthermore, the particle sizes of the calcium oxide and the calcium carbonate are both 20-35 mm.

Further, in the step 4, the pelletizer is a disc pelletizer, a pelletizing liquid is also added into a semi-finished product in the disc pelletizer, and the addition amount of the pelletizing liquid is 12.8% of the mass of the semi-finished product.

Further, in the step 2, the granularity of the slag powder is 5 +/-2 mm.

The preparation method of the novel top slag modifier provided by the invention has the following beneficial effects:

(1) the cold start current value (CCA) of the invention reaches 800A, which is improved by 30% compared with the common battery;

(2) the static charging acceptance of the invention reaches 4.6, which is improved by 85% compared with the common battery;

(3) the start-stop circulation capacity of the invention reaches 42000 times;

(4) the percentage of discharge capacity to rated capacity (DOD) cycle of the invention exceeds 48 units, which is more than 8 times of that of the common battery.

Detailed Description

The invention provides a preparation method of a novel top slag modifier, which comprises the following steps:

(1) selecting and classifying: recovering the steel mill waste residues and classifying according to the steel content;

(2) crushing: putting the classified waste residues into a crusher, and crushing the waste residues into slag powder with the particle size of 5 +/-2 mm;

(3) stirring: weighing a proper amount of slag powder, adding an auxiliary material and an additive according to 1.5-2.5kg/t, wherein the mass ratio of the auxiliary material to the additive is 3:1, the auxiliary material comprises the following components in percentage by mass: aluminum: aluminum oxide = 0.8: 9.2, the additive comprises the following components in percentage by mass: calcium oxide: calcium carbonate = 8: 2, mixing and stirring uniformly to obtain a semi-finished product;

(4) balling: putting the semi-finished product into a disc type pelletizer, adding pelletizing liquid with the mass of 12.8 percent of the semi-finished product into the disc type pelletizer, and making pellets with proper size;

(5) packaging: and packaging the pellets to obtain a finished product.

The invention has the following beneficial effects: the invention uses the waste slag produced in the production process of a steel mill and adds other auxiliary raw materials to prepare a product which can meet the application requirement of the steelmaking smelting technology; the invention can greatly reduce the production cost without increasing nitrogen, effectively reduce the FeO and MnO contents in the steel slag, improve the aluminum content in the steel slag, quickly form reductive slag with good adsorption capacity, improve the alkalinity of top slag, optimize the desulfurization condition of the top slag and enhance the deoxidation capacity, so that the invention can simultaneously have various using effects of a slag former, a refining agent, a desulfurization promoter, a slag modifier and the like, thereby realizing the forward movement of the refining process, shortening the refining time and improving the production efficiency.

The technical solution of the present invention will be further described in detail with reference to specific embodiments. The following examples are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of the invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.