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Steelmaking sludge recycling method

A technology of steelmaking sludge and weight percentage, which is applied in the field of converter smelting iron-containing dust to produce iron blocks for steelmaking, achieving obvious environmental protection effects and improving the recycling rate

Inactive Publication Date: 2016-06-08
赵俭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies and problems of the existing sludge recovery technology, provide iron and steel enterprises with a method to meet the recycling requirements of green environmental protection resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) Screening the steelmaking sludge, the particle size requirement: +20 mesh steelmaking sludge accounts for ≤2.0% of the total weight percentage, TFe accounts for 56% of the total weight percentage;

[0013] 2) Grinding, the time control is 28 minutes;

[0014] 3) carry out sieving classification, its particle size is controlled at-40 order;

[0015] 4) carry out drying, it controls the water content weight percentage before drying to be 9%, and the water content weight percentage after drying is 1%;

[0016] 5) Carry out magnetic separation, the percentage by weight of controlling its impurity after choosing is 3.6%;

[0017] 6) Forming: adding 2% by weight bentonite as a binder, uniformly mixing with 98% by weight steelmaking sludge, and then processing it into required iron blocks.

Embodiment 2

[0019] 1) Screening the steelmaking sludge, its particle size requirement: +20 purpose steelmaking sludge accounts for ≤1.6% of the total weight percentage, TFe accounts for 60% of the total weight percentage;

[0020] 2) Grinding, the time control is 25 minutes;

[0021] 3) carry out sieving classification, its particle size is controlled at-40 order;

[0022] 4) carry out drying, it controls the water content weight percentage before drying to be 6%, and the water content weight percentage after drying is 0.8%;

[0023] 5) Carry out magnetic separation, the percentage by weight of controlling its impurity after choosing is 3.0%;

[0024] 6) Forming: adding 3.0% by weight bentonite as a binder, uniformly mixing with 97% by weight steelmaking sludge, and then processing it into required iron blocks.

Embodiment 3

[0026] 1) Screening the steelmaking sludge, the particle size requirement: +20 purpose steelmaking sludge accounts for ≤1.8% of the total weight percentage, TFe accounts for 64% of the total weight percentage;

[0027] 2) Grinding, the time control is 30 minutes;

[0028] 3) carry out sieving classification, its particle size is controlled at-40 order;

[0029] 4) carry out drying, it controls the water content weight percentage before drying to be 8.5%, and the water content weight percentage after drying is 0.7.6%;

[0030] 5) Carry out magnetic separation, the percentage by weight of controlling its impurity after choosing is 1.1%;

[0031] 6) Molding: adding 5.0% by weight of bentonite as an adhesive, and 95% by weight.

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PUM

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Abstract

The invention discloses a steelmaking sludge recycling method, and relates to comprehensive utilization of rotary furnace smelting iron-containing soot, in particular to a method for producing iron blocks for steelmaking through the rotary furnace smelting iron-containing soot. The steelmaking sludge recycling method aims to reduce iron consumption during steelmaking and dissolution consumption. The method comprises the technological procedures that (1) steelmaking sludge is screened, specifically, according to the granularity requirements, the steelmaking sludge of more than 20 meshes accounts for less than or equal to 2.0 % of the total weight, and TFe accounts for 56% of the total weight; (2) grinding is conducted with the time being controlled to be 28 min; (3) screening classification is conducted to control the granularity of the steelmaking sludge to be less than 40 meshes; (4) drying is conducted, the weight in wet base before drying is controlled to be 9 wt%, and the weight in wet base after drying is controlled to be 1 wt%; (5) magnetic separation is carried out, the weight of impurities in the steelmaking sludge is controlled to be 3.6 wt% after magnetic separation; and (6) molding is carried out, specifically, 2 wt% of bentonite as a bonding agent is added and mixed with 98 wt% of the steelmaking sludge evenly, and the mixture is processed into the required iron blocks.

Description

technical field [0001] The invention relates to the comprehensive utilization of iron-containing fumes from converter smelting, in particular to a method for producing iron blocks for steelmaking by using converter smelting iron-containing fumes. Background technique [0002] Steelmaking sludge (hereinafter referred to as sludge) is a by-product of oxygen converter dedusting and is a valuable secondary resource. Material characteristics of steelmaking sludge: steelmaking sludge has large fluctuations in chemical composition, high iron content, high content of alkaline oxides, and fine particle size. From the perspective of chemical composition, sludge can be used as sintering and pelletizing raw materials in production. Reasonable use of sludge can not only replace some iron-containing raw materials, but also replace some binders and fluxes, and at the same time reduce production costs. , It also reduces the sewage discharge of steel mills, which is of great significance fo...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/248
CPCY02P10/20
Inventor 赵俭
Owner 赵俭