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A method for processing iron and steel smelting dust and a processing system therefor

A technology of iron and steel smelting and processing method, which is applied in the field of comprehensive utilization of resources, can solve the problems of polluting the environment, endangering human health, and high surface free energy, and achieves the effects of simple process method, guaranteed safety and convenient operation.

Inactive Publication Date: 2015-12-30
孙伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size, light weight, and easy diffusion of these iron and steel smelting dust particles, a large amount of waste gas and waste dust are easily generated during transportation and treatment, polluting the environment, and having the possibility of seriously endangering human health. With high free energy and strong adsorption capacity, the ordinary ore washing process cannot achieve a good cleaning effect, resulting in great difficulty in the process of comprehensive utilization of smelting dust in the dressing and smelting method. Therefore, an efficient and clean iron and steel The method of smelting dust to remove impurities and wash salt is very important

Method used

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  • A method for processing iron and steel smelting dust and a processing system therefor
  • A method for processing iron and steel smelting dust and a processing system therefor
  • A method for processing iron and steel smelting dust and a processing system therefor

Examples

Experimental program
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Effect test

specific experiment example 1

[0059] The machine head ash from a steel plant is fed through a closed belt to a high-strength shear mixing equipment with ultrasonic dispersion and dissolution functions. Spray equipment is used at the place where it enters the mixing equipment, and it is pre-wetted with 55°C hot water , then mix the pre-wetted machine head ash with 0.1% sodium hexametaphosphate solution, and make the solid-to-liquid ratio 1:8, and then use the high-strength shear stirring equipment with ultrasonic dispersion and dissolution function at 55 Keep warm at ℃ for 1 hour. After cleaning, the plate and frame are used for solid-liquid separation, and the filter cake is washed twice with clean water through the plate and frame backwash, finally completing the impurity removal, washing and salt purification of the machine head ash. The contents of main elements in the machine head ash before and after impurity removal and washing salt treatment are shown in Table 1.

[0060] Table 1 The content of main...

specific experiment example 2

[0063] The gas ash from a steel plant is fed to the mixing equipment through a closed belt, and a closed feeding spray system is used at the place where it enters the mixing equipment, and it is pre-wetted with 25°C hot water, and then the pre-wetted gas ash is Mix with 0.1% sodium hexametaphosphate solution to make the solid-liquid ratio 1:3, and use ultrasonic dispersion and high-strength shear force stirring system to keep warm at 25°C for 2 hours, and use the plate frame for solid-liquid separation after cleaning , the filter cake is washed twice with clean water through plate and frame backwashing, and finally the impurity removal, washing and salt purification of gas ash is completed. The contents of main elements in the gas ash before and after impurity removal and washing salt treatment are shown in Table 2.

[0064] Table 2 The content of main elements before and after the treatment of impurity removal and salt washing in a steel plant gas ash / %

[0065] p...

specific experiment example 3

[0067] The machine head ash from a steel plant is fed through a closed belt to a high-strength shear mixing equipment with ultrasonic dispersion and dissolution functions. Spray equipment is used at the place where it enters the mixing equipment, and a solution containing a surfactant at 55 ° C is used to clean it. Carry out pre-wetting, the quality of the solution containing surfactant is 2.0 times of the machine head ash; then mix the pre-wetted machine head ash with 0.05% water glass solution, and make the solid-liquid ratio 1:10, Afterwards, use a high-strength shear stirring device with the function of ultrasonic dispersion and dissolution to keep warm at 95°C for 0.5h. After cleaning, use a plate frame for solid-liquid separation. The filter cake is washed twice with clean water through the plate frame backwash, and finally complete Cleaning, washing and salt purification of machine head ash. The contents of main elements in the machine head ash before and after impurity...

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Abstract

The invention relates to the field of comprehensive utilization of resources, and particularly relates to a treatment method of iron and steel smelting dust and a treatment system used in the treatment method. The treatment method comprises the following steps: (a) spraying the iron and steel smelting dust in a closed conveying process so as to moisten the iron and steel smelting dust in advance; (b) closely conveying the iron and steel smelting dust moistened in advance to dissolving equipment, and mixing the iron and steel smelting dust and a solution containing a surface active agent; (c) treating mixed liquid for 0.5-2 hours at the temperature of 15-95 DEG C by means of ultrasonic wave dispersive dissolving and high-strength shear force stirring so as to fully moisten the mixed liquid; (d) carrying out solid-liquid separation on the fully moistened mixed liquid; and (e) washing solid phases by using clear water. The treatment system comprises a closed feeding conveyor, a conveying pipeline, spraying equipment, ultrasonic wave dispersive dissolving equipment, high-strength shear force stirring equipment, solid-liquid separation equipment and washing equipment. The method is simple in process and convenient to operate and realizes impurity removal and salt leaching of the smelting dust and preconcentration of valuable metals in the smelting dust very well.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to a method for processing iron and steel smelting dust and a processing system used therein. Background technique [0002] Iron and steel smelting dust mainly includes gas ash, machine head ash and so on. Machine head ash and gas ash are one of the main solid wastes in the sintering and ironmaking links of iron and steel enterprises. [0003] Iron ore sintering is an important link in steel production, and sintering head electrostatic precipitator ash, referred to as machine head ash, is the dust collected by the sintering head flue gas electrostatic precipitator during the iron ore sintering process. , Potassium, lead, and carbon are relatively high, and contain a considerable amount of precious metals. If the machine head ash is directly used for sintering mixture, the cyclic enrichment of potassium, sodium, zinc and other elements will have a negative impa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B7/02
CPCY02P10/20
Inventor 孙伟唐鸿鹄韩海生刘文莉
Owner 孙伟
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