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Pellet ore binder prepared by taking sludge generated in sewage treatment as raw material

A sewage treatment and binder technology, applied in water/sludge/sewage treatment, sludge treatment, improvement of process efficiency, etc., to achieve the effect of reducing pig iron smelting cost, reducing coke ratio, improving grade and metallurgical performance

Inactive Publication Date: 2012-04-11
BEIJING JUNZHIQING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to seek a more valuable application method for various sludge produced in the sewage treatment process, and to provide a new type of organic sludge with low price, simple preparation method and small residual amount for pellet production. Binder, which can completely or partially replace the existing binder, improve the grade and metallurgical properties of the furnace ore, reduce ironmaking costs and resource consumption, and reduce pollutant emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of embodiment 1 pelletizing binder

[0033] Preparation of No. 1 pellet ore binder:

[0034] The remaining activated sludge of Beijing Gaobeidian Sewage Treatment Plant was dried and crushed into powder.

[0035] No. 2 pellet ore binder preparation:

[0036] The remaining activated sludge of Beijing Gaobeidian Sewage Treatment Plant was dried and crushed into powder.

[0037] Preparation of No. 3 pellet ore binder:

[0038] The sludge in the coagulation sedimentation tank of a sewage treatment plant in Wuxi, Jiangsu was dried and crushed into powder.

[0039] The comparative sample is commercially available bentonite.

[0040] Table 1: Moisture content and ash content of pellet binders No. 1, No. 2 and No. 3

[0041] Binder type

[0042] It can be seen from Table 1 that the ash content of No. 1, No. 2 and No. 3 pellet binders is much lower than that of traditional inorganic binders. After the commonly used inorganic binders such as benton...

Embodiment 2

[0043] Embodiment 2: Utilize No. 1 pelletizing binder to prepare pellets

[0044] Use iron concentrate from Shuichang Concentrator of Shougang Mining Company as raw material, add 1.5% by weight of No. 1 pellet binder for batching, mix well and make pellets, and screen out qualified pellets to measure the compressive strength of the pellets and the drop strength of green balls, and measure the moisture content after drying. Take a certain amount of qualified green balls to measure the burst temperature. Take a certain amount of qualified green balls and dry them at 105°C for 2 hours, put them into the shaft furnace, put them in the preheating section and preheat them at 900°C for 10 minutes, then put them in the roasting section and roast them at 1160°C for 20 minutes, take them out and cool them Measure the compressive strength of roasted balls.

[0045] The measured moisture content of green balls is 8.09%, the compressive strength of green balls is 10.1N / ball, the drop str...

Embodiment 3

[0046] Embodiment 3: Utilize No. 1 pelletizing binder to prepare pellets

[0047] Use iron concentrate from Shuichang Concentrator of Shougang Mining Company as raw material, add 2.0% by weight of No. 1 pellet binder for batching, mix well and make pellets, screen out green pellets with qualified particle size to measure the compressive strength of green pellets and the drop strength of green balls, and measure the moisture content after drying. Take a certain amount of qualified green balls to measure the burst temperature. Take a certain amount of qualified green balls and dry them at 105°C for 2 hours, put them into the shaft furnace, put them in the preheating section and preheat them at 900°C for 10 minutes, then put them in the roasting section and roast them at 1160°C for 20 minutes, take them out and cool them Measure the compressive strength of roasted balls.

[0048] The measured moisture content of green balls is 8.55%, the compressive strength of green balls is 1...

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Abstract

The invention relates to a pellet ore binder prepared by taking sludge generated in sewage treatment as a raw material. The binder comprises sludge in a preliminary sedimentation tank, sludge in a coagulation sedimentation basin or residual activated sludge, wherein the sludge in the preliminary sedimentation tank, sludge in the coagulation sedimentation basin or residual activated sludge are powdery sludge obtained by drying, crushing and treating. The invention also relates to an application and a usage method of the pellet ore binder prepared by sludge. The pellet ore binder prepared by sludge generated in sewage treatment is capable of raising the grade and the metallurgy performance of a furnace ore, reducing the iron-making cost, reducing the resource consumption and energy consumption, minimizing the pollutant discharge capacity and raising the capability of national steel material and product in the competition of international markets. The sludge generated in sewage treatment which is difficult to be treated can be obtained resource utilization with high efficiency, so that the mineral product resource such as bentonite and the like can be saved.

Description

technical field [0001] The invention relates to a pellet binder, in particular to a pellet binder prepared from sludge produced in sewage treatment. Background technique [0002] With the development of large-scale blast furnaces, it is of great significance to improve the technical and economic indicators of blast furnace ironmaking production in my country by improving the grade of blast furnace ore and optimizing the structure of furnace charges. In recent years, due to the advantages of good strength, uniform particle size, regular shape, high iron content, and good reducibility, pellets can increase production and save coke in blast furnace smelting, improve ironmaking technical indicators and economic indicators, and reduce pig iron production. The role of reducing costs and improving economic benefits is being widely favored and highly valued. [0003] Binder is an indispensable raw material for pelletizing. Basic principles for selecting pellet binders: (1) It need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C02F11/00
CPCY02P10/20
Inventor 王化军何秋慧葛鹏王志花陶娟娟程鑫
Owner BEIJING JUNZHIQING SCI & TECH
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