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Method for sewage neutralization and efficient cyclic utilization of waste residue

A technology for sewage and waste residues, applied in the field of efficient recycling of sewage and waste residues, can solve the problems of waste of mineral resources, insignificant benefits, and high processing costs, and achieve the effects of improving comprehensive utilization of resources and increasing economic benefits.

Active Publication Date: 2015-05-13
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of producing sulfuric acid from smelting flue gas, more than 100 kilograms of acidic wastewater is produced for each ton of sulfuric acid produced. The treatment of acidic wastewater is usually neutralized with lime or alkaline carbide slag, and about 150 kilograms of neutralized water is discharged per cubic meter of treatment. Waste slag (neutralization slag for short) is currently mainly used as additives in cement plants for cheap sale or storage, which not only occupies the land, but also increases the maintenance and management costs of the enterprise, and has a potential impact on the surrounding ecological environment.
At the same time, the discarded neutralization slag has not been utilized, which has also caused a great waste of mineral resources
According to surveys and literature introductions, the main component of neutralization slag is gypsum (CaSO 4 2H 2 O), can be processed into building gypsum for the production of building materials such as gypsum slabs and blocks, or for the production of cement retarders, but in the process of practical application, the technical process is complicated, the standards are strict, and the processing cost is high. The benefits are not obvious. Therefore, it is particularly important to research and explore a method of high-efficiency, recyclable regeneration and recycling, so as to realize turning waste into wealth, reduce costs, and improve economic benefits of enterprises.

Method used

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  • Method for sewage neutralization and efficient cyclic utilization of waste residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Acidic wastewater neutralization treatment process

[0026] Acidic wastewater with a sulfuric acid concentration of 5% enters 4 stirring tanks connected in series, adding high-alkalinity calcium oxide slag produced after calcination to control pH = 7, fully aerating during the neutralization process, for 6 hours, and 5.5% after neutralization The thin slurry enters the thickener for thickening, the overflow returns to the acid purification process for use, and the high-concentration slurry enters the filter press dehydration process;

[0027] 2) Filter press dehydration

[0028] The high-concentration slurry is pumped into the filter press for pressing, filtration and dehydration, the filtrate is returned to the thickener, and the filter cake with a moisture content of 45% enters the rotary kiln baking process;

[0029] 3) Rotary kiln baking dehydration

[0030] The filter cake with a moisture content of 45% enters the rotary kiln through a belt conveyor, the rotar...

Embodiment 2

[0040] 1) Acidic wastewater neutralization treatment process

[0041] Acid wastewater with a sulfuric acid concentration of 10% enters 4 stirring tanks connected in series, and the high-basicity calcium oxide slag produced after calcination is added to control the pH=7, and the neutralization process is fully aerated for 7 hours, and after neutralization, 7% The thin slurry enters the thickener for thickening, the overflow returns to the acid purification process for use, and the high-concentration slurry enters the filter press dehydration process;

[0042] 2) Filter press dehydration

[0043] The high-concentration slurry is pumped into the filter press for pressing, filtration and dehydration, the filtrate is returned to the thickener, and the filter cake with a moisture content of 48% enters the rotary kiln baking process;

[0044] 3) Rotary kiln baking dehydration

[0045] The filter cake with a moisture content of 48% enters the rotary kiln through a belt conveyor. The...

Embodiment 3

[0055] 1) Acidic wastewater neutralization treatment process

[0056] Acidic wastewater with a sulfuric acid concentration of 15% enters 4 stirring tanks connected in series, adding high-basicity calcium oxide slag produced after calcination to control pH = 7, fully aerating during the neutralization process, for 8 hours, and 8% after neutralization The thin slurry enters the thickener for thickening, the overflow returns to the acid purification process for use, and the high-concentration slurry enters the filter press dehydration process;

[0057] 2) Filter press dehydration

[0058] The high-concentration slurry is pumped into the filter press for pressing, filtration and dehydration, the filtrate is returned to the thickener, and the filter cake with a moisture content of 50% enters the rotary kiln baking process;

[0059] 3) Rotary kiln baking dehydration

[0060] The filter cake with a moisture content of 50% enters the rotary kiln through a belt conveyor, the rotary k...

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Abstract

The invention belongs to the technical field of environment protection in gold smelting, and sewage purification treatment, recycling regeneration and comprehensive utilization of chemical industry, and especially relates to a method for sewage neutralization and efficient cyclic utilization of waste residue. The method comprises the following steps of 1) acid sewage neutralization treatment process; 2) filter pressing and dehydrating by a pressure filter; 3) baking and dehydrating by a rotary kiln; 4) roasting in a rotary calcining kiln; 5) returning back calcined product to each system. The method realizes efficient cyclic utilization in closed loop, improves comprehensive utilization of resource, not only increases economic benefits of enterprises, but also has environment-protection and social benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection of gold smelting and chemical industry sewage purification treatment, resource regeneration and comprehensive utilization, and in particular relates to a method for efficient recycling of sewage neutralization and waste residue. Background technique [0002] In the process of producing sulfuric acid from smelting flue gas, more than 100 kilograms of acidic wastewater is produced for each ton of sulfuric acid produced. The treatment of acidic wastewater is usually neutralized with lime or alkaline carbide slag, and about 150 kilograms of neutralized water is discharged per cubic meter of treatment. Waste slag (referred to as neutralization slag) is currently mainly used as an additive in cement plants for cheap sale or storage, which not only encroached on land, increased maintenance and management costs of the enterprise, but also had a potential impact on the surrounding ecologica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C01F11/04
Inventor 吕寿明王建政孙忠胜梁志伟
Owner SHANDONG GUODA GOLD