A process for quicklime digestion, dust removal and sewage sludge treatment

A treatment process and technology for sewage sludge, which is applied in sludge treatment, dewatering/drying/concentrating sludge treatment, water/sewage treatment, etc., can solve problems such as a large amount of waste residue and waste of water resources, and ensure stable and efficient operation. Effect

Active Publication Date: 2018-07-27
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A process for quicklime digestion, dust removal and sewage sludge treatment
  • A process for quicklime digestion, dust removal and sewage sludge treatment
  • A process for quicklime digestion, dust removal and sewage sludge treatment

Examples

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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

A quicklime digestion, dust removal and sewage sludge treatment process, comprising the following steps: (1) quicklime digestion; (2) dust removal of dusty gas; (3) sewage in the stirring tank (A1) is discharged into the quicklime digester (1 ) or into the sedimentation tank (A2), the upper layer is sedimentation water, and the lower layer is sedimentation sludge; (4) the sedimentation water enters the clear water tank (A3), and the water in the clear water tank (A3) is passed through the clear water pipeline (A301) by the clear water pump (A301) A302) is transported to the cleaning device (A4), or, the water in the clear water tank (A3) is transported to the quicklime digester (1); (5) the precipitated sludge is filtered through the filter press device (A5) to form press filter sludge and press-filtered water, the press-filtered water is transported to the quicklime digester (1) or sent to the stirring tank (A1), and the press-filtered sludge is crushed and sent to the ash bin, the stirring tank (A1) or the quicklime digester (1) . The invention provides a quicklime digestion, dust removal and sewage treatment process, which can realize the recycling of water resources, recycle and utilize the volatilized lime in the production process, and at the same time, use the waste water resources to clean equipment.

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 Patents(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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