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Novel low-cost and short-process sludge recovering and ball pressing technology

A short-process, low-cost technology, applied in the direction of improving process efficiency, can solve problems such as shortening the process, and achieve the effect of shortening the process and reducing costs

Inactive Publication Date: 2017-05-31
SHANDONG LAIGANG YONGFENG STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, steel mills have been trying to use various methods to shorten the process, reduce losses, and self-cycle the sludge and dust, but they have not been able to effectively solve the problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present invention provides a low-cost and short-process sludge recovery process for pelletizing, which includes the following steps:

[0025] Step 1: Collection and treatment of sewage and flue gas: including: collection and treatment of sewage and flue gas;

[0026] in,

[0027] The collection and treatment of the sewage comprises the following steps:

[0028] a: The sewage generated during the converter flue gas purification process is discharged through the sewage into the tank sedimentator for sedimentation treatment;

[0029] b: Squeeze the sewage after sedimentation treatment through a filter press to obtain cake sludge, and the water content of cake sludge is less than 30%;

[0030] The collection and processing of the flue gas includes the following steps:

[0031] c: The flue gas generated during the purification process of the converter flue gas is discharged into the evaporative cooler through the pipeline and treated with water, so that the large part...

Embodiment 2

[0038] Embodiment 2: The difference between embodiment 2 and embodiment 1 is that: in step 2, the ratio of bentonite to the total weight of marl paste is 10%; in step 3, the pressure selected by the ball pressing machine is 14Mpa.

Embodiment 3

[0039] Embodiment 3: The difference between embodiment 3 and embodiment 1 is that: in step 2, the ratio of bentonite to the total weight of marl paste is 12%; in step 3, the pressure selected by the ball pressing machine is 15Mpa.

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PUM

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Abstract

The invention provides a novel low-cost and short-process sludge recovering and ball pressing technology. The technology comprises steps as follows: Step 1: collecting treatment of sewage and smoke includes collecting treatment of the sewage and collecting treatment of the smoke; Step 2: preparation of marl paste includes following steps: d: mixing for preparation of the paste: an adhesive is added to cake-shaped sludge and fly ash which obtained in Step 1 and evenly mixed, and the marl paste is obtained; the weight ratio of the cake-shaped sludge to the fly ash ranges from 1:8.5 to 1:7.5; e: drying: the marl paste obtained in Step d is dried, the moisture after drying is controlled to range from 10% to 15%, and the marl paste is naturally aired for 3-5 h after drying; Step 3: ball pressing: the marl paste obtained in Step 2 is pressed to form balls in a ball pressing machine, the balls are naturally air-dried for 24 h, and sludge balls are obtained; the moisture of the sludge balls in the step is controlled to be 5% or below, and the strength is controlled in such an extent that the balls can bear 500 N pressure without breakage.

Description

technical field [0001] The invention relates to a waste utilization technology in the steelmaking process, in particular to a low-cost and short-flow process sludge recycling technology for ball pressing. Background technique [0002] In the existing technology, the by-product sludge and dedusting ash produced by the steelmaking plant are used as sintering ingredients. The original process flow is: sludge, dedusting ash → sinter → blast furnace (hot metal) → steelmaking, and the process is relatively long. large. In this regard, steel mills have been trying to use various methods to shorten the process, reduce losses, and self-cycle the sludge and dust, but they have not been effectively resolved. Contents of the invention [0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a low-cost short-process sludge recovery process for briquetting, which is used to solve the above-mentioned problems in the prior ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248
CPCC22B1/2406C22B1/248Y02P10/20
Inventor 吕长海杨燕春张如江刘强李新波
Owner SHANDONG LAIGANG YONGFENG STEEL & IRON