Vacuum co-reduction synergistic utilization method for sulfuric-acid residues and fly ash

A technology of fly ash and sulfuric acid slag, which is applied to the improvement of process efficiency, alumina/hydroxide, etc., to achieve the effects of less energy consumption, environmental protection and simplicity, and low cost

Pending Publication Date: 2020-12-25
HUBEI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this will consume a large amount of inert gas, and the reduction temperature when using atmosphere protection is significantly higher than that under vacuum
[0004] By searching the existing patents and literature, no report was found on the production of ferrosilicon alloy and the extraction of alumina using the composite solid waste of sulfuric acid slag and fly ash as the main raw material and biomass as the reducing agent in vacuum co-reduction

Method used

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  • Vacuum co-reduction synergistic utilization method for sulfuric-acid residues and fly ash

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Effect test

Embodiment 1

[0025] A method for synergistic utilization of sulfuric acid slag and fly ash vacuum co-reduction in this embodiment, see figure 1 , including the following steps:

[0026] (1) Briquetting: Weigh 20 kg of fly ash and 15 kg of sulfuric acid slag as raw materials, and 52 kg of biochar as a reducing agent. The fly ash and sulfuric acid slag need to be pulverized and pretreated so that the particle size is less than 200 meshes. More than 80%, and then the biomass charcoal is crushed so that the particle size is less than 100 mesh, accounting for more than 80%. Then add 13.9 kg of binder and mix well, put it in a press with a pressure of 20MPa and press it into a cylindrical compact with a diameter of 20 mm and a height of 18 mm; the binder is a polymer with a mass fraction of 15 wt%. Vinyl alcohol; the mass percentages of main components in sulfuric acid slag are: TFe 65.76%, SiO 2 1.82%, Al 2 o 3 0.38%, CaO 0.46%, SO 3 1.64%, Na 2 O 0.61 %; the mass percentage of main com...

Embodiment 2

[0031] A method for synergistic utilization of sulfuric acid slag and fly ash vacuum co-reduction in this embodiment, see figure 1 , including the following steps:

[0032] (1) Briquetting: Weigh 20 kg of fly ash and 11 kg of sulfuric acid slag as raw materials, and 40 kg of biochar as a reducing agent. The fly ash and sulfuric acid slag need to be pulverized and pretreated so that the particle size is less than 200 meshes. More than 80%, and then the biomass charcoal is crushed so that the particle size is less than 100 mesh, accounting for more than 80%. Then add 9.2 kg of binder and mix well, put it in a press with a pressure of 18 MPa and press it into a cylindrical compact with a diameter of 20 mm and a height of 22 mm; the binder is a polymer with a mass fraction of 18 wt%. Vinyl alcohol; the mass percentages of main components in sulfuric acid slag are: TFe 60.72%, SiO 2 3.87%, Al 2 o 3 2.32%, CaO 2.14%, SO 3 1.83%, Na 2 O 0.76 %; the mass percentage of main comp...

Embodiment 3

[0037] In this embodiment, a method for synergistic utilization of sulfuric acid slag and fly ash vacuum co-reduction, see figure 1 , including the following steps:

[0038] (1) Briquetting: Weigh 20 kg of fly ash and 13 kg of sulfuric acid slag as raw materials, and 55 kg of biochar as a reducing agent. The fly ash and sulfuric acid slag need to be pulverized and pretreated to make the particle size less than 200 meshes. More than 80%, and then the biomass charcoal is crushed so that the particle size is less than 100 mesh, accounting for more than 80%. Then add 10.6 kg of binder and mix well, put it in a press with a pressure of 15MPa and press it into a cylindrical compact with a diameter of 20 mm and a height of 16 mm; the binder is a polymer with a mass fraction of 14 wt%. Vinyl alcohol; the mass percentages of main components in sulfuric acid slag are: TFe 63.23%, SiO 2 3.16%, Al 2 o 3 1.42%, CaO 1.07%, SO 3 1.72%, Na 2 O 0.65 %; the mass percentage of main comp...

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Abstract

The invention discloses a vacuum co-reduction synergistic utilization method for sulfuric-acid residues and fly ash. The method comprises the following steps: (1) briquetting; (2) drying; (3) reduction; (4) screening, magnetic separation and the like to finally obtain iron-silicon alloy particles, iron-silicon alloy powder and tailings containing aluminum oxide. Propulsion of ecological civilization construction is taken as a starting point, chemical solid waste sulfuric-acid residues, coal-fired power plant solid waste fly ash and crop spike stalks are taken as raw materials, and wastes are treated with wastes, so that resourceful utilization of various solid wastes such as sulfuric-acid residues, fly ash and plant spike stalks is implemented; the obtained iron-silicon alloy can provide cheap raw materials for iron and steel metallurgy enterprises and the electric power industry; and the separated tailings can be used as raw materials for smelting aluminum in nonferrous enterprises.

Description

technical field [0001] The invention relates to the technical field of utilization of industrial solid waste resources, in particular to a method for synergistic utilization of sulfuric acid slag and fly ash in vacuum co-reduction. Background technique [0002] At present, my country is short of high-quality mineral resources, and the contradiction between supply and demand of domestic iron, silicon and aluminum has become increasingly prominent, and it has a high degree of dependence on foreign high-quality ore resources. With the acceleration of my country's industrialization, the consumption of mineral resources in my country will further increase, which may lead to different degrees of shortage of mineral resources in the future. However, the amount of industrial solid waste in my country is relatively large, and the recycling of solid waste has become an effective way to effectively alleviate the shortage of mineral resources. How to comprehensively utilize the valuabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B7/00C22B21/00C01F7/02
CPCC01F7/02C21B13/0066C22B7/001C22B21/00Y02P10/20
Inventor 雷家柳赵栋楠徐先锋胡可王磊陈樊张昌运
Owner HUBEI POLYTECHNIC UNIV
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