Process for quicklime digestion, dedusting and sewage sludge treatment

A treatment process, sewage sludge technology, applied in sludge treatment, dehydration/drying/thickened sludge treatment, water/sewage treatment, etc., can solve the problems of a large amount of waste residue, waste of water resources, etc., to ensure stable and efficient operation Effect

Active Publication Date: 2016-11-09
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a quicklime digestion, dust removal and sewage sludge treatment process to solve the waste of water resources in the field of quicklime digestion and dust removal in iron and steel sintering plants, resulting in a large amount of waste residue, waste water, etc.

Method used

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  • Process for quicklime digestion, dedusting and sewage sludge treatment
  • Process for quicklime digestion, dedusting and sewage sludge treatment
  • Process for quicklime digestion, dedusting and sewage sludge treatment

Examples

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Effect test

Embodiment 1

[0167] A quicklime digestion, dust removal and sewage sludge treatment process, comprising the following steps:

[0168] (1) quicklime digestion: put quicklime A0 into two-stage quicklime digester 1 for digestion;

[0169] (2) Dedusting of dust-containing gas: the dust-containing gas in quicklime digester 1 is output to water bath dust collector Q1, and the dust removal sewage in the dust removal pool at the bottom of water bath dust collector Q1 is discharged into stirring tank A1 or two-stage quicklime digestion Device 1, optionally, the dedusting sewage in the dedusting pool at the bottom of the water bath deduster Q1 is transported to the quicklime digester 1 for use as digestion water;

[0170] (3) The sewage in the stirring tank A1 is discharged into the two-stage quicklime digester 1 or enters the sedimentation tank A2, and the sedimentation tank A2 sediments and separates the sewage, the upper layer is sedimentation water, and the lower layer is sedimentation sludge; ...

Embodiment 2

[0175] Repeat Example 1, except that quicklime digester 1 is a three-stage quicklime digester.

Embodiment 3

[0177] Example 1 was repeated, except that the steelmaking sludge H was transported to the quicklime digester 1 through the sludge pump G.

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Abstract

The invention provides a process for quicklime digestion, dedusting and sewage sludge treatment. The process comprises the following steps: (1) digesting quicklime; (2) subjecting dusty gas to dedusting; (3) discharging sewage in a stirring tank (A1) into a quicklime digester (1) or into a sedimentation basin (A2), wherein an upper layer is settled water and the lower layer is settled sludge; (4) allowing the settled water to enter a clear water tank (A3) and conveying water in the clear water tank (A3) into a cleaning device (A4) via a clear water pump (A301) and a clear water pipeline (A302), or conveying water in the clear water tank (A3) to the quicklime digester (1); and (5) subjecting the settled sludge to press filtration by a press filtration device (A5) so as to form press-filtered sludge and press-filtered water, conveying the press-filtered water to the quicklime digester (1) or to the stirring tank (A1), and crushing and conveying the press-filtered sludge to an ash bin and the stirring tank (A1) or to the quicklime digester (1). The process for quicklime digestion, dedusting and sewage sludge treatment in the invention can realize recycling of water resources, recycles lime volatilized in the process of production, and cleans equipment by using a waste water resource.

Description

technical field [0001] The invention relates to the field of quicklime digestion and dust removal in iron and steel sintering plants, in particular to a quicklime digestion, dust removal and sewage sludge treatment process. The method mainly solves the problems of low dust removal efficiency and poor dust removal effect of existing quicklime digestion, environmental pollution of quicklime digestion and dust removal sewage, and how to reuse the dust removal sewage. Background technique [0002] With the development of modern industry and the improvement of people's quality of life, the requirements for environmental protection are getting higher and higher. Safe production and clean production have become the symbol of modern enterprise civilization. [0003] In the iron and steel metallurgical industry, it is generally necessary to sinter iron ore before entering the blast furnace for ironmaking, and quicklime plays an important role in the sintering process. First, it impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/04C04B2/08B01D50/00C02F1/52C02F11/12
CPCC02F1/529C02F11/121C04B2/04C04B2/08B01D50/40
Inventor 张扬陈宇黎前程李靖李康苏道
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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