Preparation method of high-aluminum slag-modifier pellets for molten steel refining

The technology of slag conditioner and pellet is applied in the field of preparation of high-aluminum slag conditioner pellets in molten steel refining, which can solve problems such as difficulty in processing and utilization, and achieve the effects of good slag fluidity, strong adsorption and inclusion ability, and cost reduction.

Inactive Publication Date: 2017-05-31
PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the steelmaking plants have realized the casting slag that can be recycled online in the hot state, but it is difficult to process and utilize part of the cold state recovery

Method used

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  • Preparation method of high-aluminum slag-modifier pellets for molten steel refining
  • Preparation method of high-aluminum slag-modifier pellets for molten steel refining
  • Preparation method of high-aluminum slag-modifier pellets for molten steel refining

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preparation example Construction

[0023] The preparation method of the high-alumina slag adjusting agent pellets used in molten steel refining of the present invention, the following steps are performed in sequence:

[0024] a. The ladle casting residue is crushed by a crusher, and then the first casting residue particles with a particle size of 1 to 4 mm are screened out through a sieve;

[0025] b. The composition of the first casting slag particles obtained in step a is detected, and the second casting slag particles are screened out, wherein the chemical composition of the second casting slag particles is CaO≥45%, Al2O310~25 %, MgO≥12%, SiO2≤8%, S≤0.2%;

[0026] c. Add the second casting slag particles, bauxite powder, aluminum particles or aluminum powder into the mixing mixer for dry mixing, and then add the pellet binder for dry mixing until evenly mixed to obtain the first mixed material. Among them, by weight percentage, the second casting slag particles are 52-58%, bauxite powder 10-13%, aluminum pa...

Embodiment 1

[0051] Use the automatic weighing and batching system to weigh and batch the three raw materials of the second casting slag particles, bauxite powder and aluminum particles, wherein the second casting slag particles, bauxite powder and aluminum particles each account for 52% of the total weight of the raw materials , 10%, and 25%; and then transport these three raw materials to the HN-500 mixer through a belt conveyor for 5 minutes of dry mixing, then add 2% of the total weight of the raw materials to the mixer. The pellet binder continues to dry mix After 3 minutes of dry mixing, add water to the raw materials by spraying at a speed of 0.45 kg / s, and the total amount of water added is 7% of the total weight of the raw materials. After adding water, wet mix for 4 minutes, transport the wet material after mixing to the XMQ-10 ball press machine through the belt conveyor and press it into a 30mm ellipsoid product, use a 10mm sieve for a sieve and pass it through the belt type Th...

Embodiment 2

[0057] Use the automatic weighing and batching system to weigh and batch the three raw materials of the second casting slag particles, bauxite powder and aluminum powder, wherein the second casting slag particles, bauxite powder and aluminum powder each account for 54% of the total weight of the raw materials , 12%, and 28%; and then transport these three raw materials to the HN-500 mixer for 6 minutes through the belt conveyor, and then add 2% pellet binder of the total weight of raw materials to the mixer to continue dry mixing After 3 minutes, add water to the raw materials by spraying after the dry mixing is completed. The spraying speed is 0.48kg / s, and the total amount of water added is 8% of the total weight of the raw materials. After adding water, wet mix for 4 minutes, transport the wet material after mixing to the XMQ-10 briquetting machine through a belt conveyor and press it into a 35mm ellipsoid product, use a 10mm sieve for a sieve and pass it through a belt conv...

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Abstract

The invention relates to the technical field of molten steel refining, in particular to a preparation method of high-aluminum slag-modifier pellets for molten steel refining. The preparation method of the high-aluminum slag-modifier pellets for molten steel refining includes the following steps in sequence that (1) ladle casting residual slag is crushed by a crusher, and then first casting residual slag particles are sieved by a sieve; (2), second casting residual slag particles are sieved from the first casting residual slag particles; (3), the second casting residual slag particles, alumina powder and aluminum particles or aluminum powder are added into a mixing agitator to be uniformly blended in a dry manner; (4), then, water in a certain proportion is added into a first mixed material, stirring is performed while water is sprayed till the material is uniformly mixed, and a second mixed material is obtained; (5), the stirred and uniformly mixed second mixed material is sent to a cold pressing molding machine to be pressed into an oval shape; (6), the material obtained after cold pressing molding is performed is naturally aired and dried, sieving is performed after baking and drying are performed, and the high-aluminum slag-modifier pellets are obtained. The recycled ladle casting residual slag particles are adopted for the high-aluminum slag-modifier pellets prepared through the method, and the cost is remarkably lowered.

Description

technical field [0001] The invention relates to the technical field of molten steel refining, in particular to a method for preparing high-alumina slag adjusting agent pellets for molten steel refining. Background technique [0002] For a long time, after the casting of molten steel in large steelmaking plants, a small amount of molten steel and steel slag remain in the ladle, and these residual molten steel and steel slag are collectively referred to as casting slag. Most of the steelmaking plants have realized the casting slag that can be recycled online in the hot state, but it is difficult to process and utilize some of the cold state recycling. The resulting residual cold casting slag is very hard in quality and relatively complex in chemical composition. The main components are shown in Table 1 (taking a domestic steel factory as an example). [0003] Table 1 Composition of ladle casting slag produced by a domestic steel plant / % [0004] [0005] Table 1 [0006...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 卓胜陈涛黎光正毛朋郑德明
Owner PANZHIHUA GANGCHENG GROUP
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