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Comprehensive utilization method for iron and steel smelting dust washing wastewater

A technology for iron and steel smelting and waste water, applied in the field of comprehensive utilization of resources, can solve the problems of large equipment and building damage, crevice corrosion and pitting corrosion, serious environmental pollution, etc., and achieve the effects of reduced energy consumption, economical efficiency, and friendly process environment.

Inactive Publication Date: 2014-08-20
孙伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Heavy metal wastewater not only seriously pollutes the environment but also is extremely harmful to humans
Chloride ion wastewater will promote corrosion reactions, easily penetrate the protective film on the metal surface, cause crevice corrosion and pitting corrosion, and cause great harm to equipment and buildings

Method used

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  • Comprehensive utilization method for iron and steel smelting dust washing wastewater

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Effect test

Embodiment 1

[0025] Aiming at the comprehensive utilization of the machine head ash washing wastewater in a steel plant, firstly, 0.5% of the mass of the washing wastewater was added to the potassium hydroxide as a precipitant, and 0.1% of the mass of the washing wastewater was used as a flocculant, and then The wastewater after flocculation and sedimentation treatment is separated from solid and liquid by plate and frame filter press, and the solid phase is used for comprehensive recovery of heavy metals (by one or more comprehensive recovery of heavy metals in flotation, gravity separation, magnetic separation and other beneficiation methods), The method for comprehensively recovering heavy metals is a conventional method in the art and will not be repeated here. The liquid phase is adjusted to a pH between 7.5 and 8.5 with hydrochloric acid, and sent to the reverse osmosis pre-enrichment system for pre-enrichment of alkali metals and chloride ions at a temperature of 15°C to maintain the...

Embodiment 2

[0029] To comprehensively utilize the gas ash washing wastewater from a steel plant, first add 0.7% potassium hydroxide as a precipitant and 0.1% polyacrylamide to it, and then flocculate and settle The final waste water is separated from solid and liquid using a plate and frame filter press, and the solid phase is used for comprehensive recovery of heavy metals (by one or more comprehensive recovery of heavy metals in mineral processing methods such as flotation, gravity separation, and magnetic separation), and the comprehensive recovery The heavy metal method is a conventional method in the art and will not be repeated here. The liquid phase is adjusted to a pH between 7.5 and 8.0 with hydrochloric acid, and sent to the reverse osmosis pre-enrichment system for pre-enrichment of alkali metals and chloride ions at a temperature of 25°C, maintaining a recovery desalination rate of about 95%, and completing pre-enrichment After collection, the low brine (potassium chloride con...

Embodiment 3

[0033] Aiming at the comprehensive utilization of the machine head ash washing wastewater in a steel plant, firstly, 0.4% potassium oxide was added as a precipitant, and 0.1% polyacrylamide was used as a flocculant, and then the The wastewater after flocculation and sedimentation treatment is separated from solid and liquid by plate and frame agent filter press, and the solid phase is used for comprehensive recovery of heavy metals (by one or more comprehensive recovery of heavy metals in flotation, gravity separation, magnetic separation and other beneficiation methods), The method for comprehensively recovering heavy metals is a conventional method in the art and will not be repeated here. The liquid phase is adjusted to a pH between 7.5 and 8.5 with hydrochloric acid, and transported to the reverse osmosis pre-enrichment system for pre-enrichment of alkali metals and chloride ions at a temperature of 35°C, maintaining a recovery desalination rate of about 90%, and completing...

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Abstract

The invention relates to the field of comprehensive utilization of resources, and in particular relates to a comprehensive utilization method for iron and steel smelting dust washing wastewater. The method comprises the following steps: a) adding a precipitating agent and a flocculating agent into the iron and steel smelting dust washing wastewater to form a suspension; b) performing solid-liquid separation on the suspension, and collecting a solid phase and a liquid phase respectively; c) delivering the liquid phase to a reverse osmosis pre-enrichment system to complete pre-enrichment of alkali metals and chlorine ions and then obtain low salt water and a concentrated salt solution for washing smelting dust; and d) performing freeze drying on the concentrated salt solution to obtain a potassium salt and fresh water. The method realizes comprehensive utilization of the iron and steel smelting dust washing wastewater; the alkali metals and the chlorine ions can be pre-enriched through the reverse osmosis pre-enrichment system and freeze-dried, so that the energy consumption is reduced greatly compared with high salt water evaporation; meanwhile, the pre-enrichment manner has a relatively wide application prospect in the high salt wastewater treatment; the whole process is environment-friendly, economic and efficient.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to a method for comprehensive utilization of iron and steel smelting dust washing wastewater. Background technique [0002] Comprehensive recycling of iron and steel smelting dust is one of the important issues facing the iron and steel industry at present. However, these iron and steel smelting dust particles are small in size, light in weight, and easy to spread. The transportation and treatment process easily produces a large amount of waste gas and waste dust, polluting the environment, It has the possibility of seriously endangering human health. At the same time, smelting dust has a large specific surface area, high surface free energy, and strong adsorption capacity. Therefore, before the comprehensive utilization of iron and steel smelting dust, it is often necessary to remove impurities and clean it. The washing wastewater generated in this process cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/16
Inventor 孙伟唐鸿鹄韩海生刘文莉
Owner 孙伟
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