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Method for full resource utilization of sulfuric-acid residue and fly ash

A technology for fly ash and sulfuric acid slag, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve problems such as undiscovered extraction of alumina, and achieve the effects of low cost, low energy consumption, and simple production process

Inactive Publication Date: 2021-01-15
HUBEI POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] By searching the existing patents and literature, no relevant reports were found on the production of iron-silicon alloy and the extraction of alumina using sulfuric acid slag and fly ash composite solid waste as the main raw material

Method used

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  • Method for full resource utilization of sulfuric-acid residue and fly ash

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Briquetting: Sulfuric acid slag and fly ash are used as raw materials, and anthracite is used as a reducing agent. First, the raw materials and reducing agent need to be pretreated by ball milling to make the particle size less than 200 mesh and reach more than 80%, and then add a binder to fully mix Uniform, pressed into a cylindrical briquette; wherein, the mass ratio of sulfuric acid slag, fly ash, and anthracite is 15:20:9; the binder is polyvinyl alcohol with a mass fraction of 12%, and the addition amount is sulfuric acid slag, powder 14wt% of the total mass of coal ash and reducing agent, and the pressing force of the briquette is 15MPa.

[0028] The main raw material composition is: sulfuric acid slag main composition mass percentage: TFe=64.76%, SiO 2 1.82%, Al 2 o 3 0.38%, CaO0.46%, SO 3 1.64%, Na 2 O0.61%. Main mass percentage of fly ash: SiO 2 54.72%, Al 2 o 3 25.60%, Fe 2 o 3 5.93%, CaO6.71%, TiO 2 1.28%, SO 3 1.06%, K 2 O2.63%. Main mass ...

Embodiment 2

[0034] (1) Briquetting: use sulfuric acid slag and fly ash as raw materials, and anthracite as reducing agent. First, the raw material and reducing agent need to be pretreated by ball milling to make the particle size less than 200 mesh and reach more than 80%; then add binder and mix thoroughly Uniform, pressed into a cylindrical briquette; wherein, the mass ratio of sulfuric acid slag, fly ash, and anthracite is 14.5:20:8; the binder is polyvinyl alcohol with a mass fraction of 15%, and the addition amount is sulfuric acid slag, powder 10wt% of the total mass of coal ash and reducing agent, the pressing force of the briquette is 13MPa.

[0035] The main raw material composition is: sulfuric acid slag main composition mass percentage: TFe=60.72%, SiO 2 3.87%, Al 2 o 3 2.32%, CaO2.14%, SO 3 1.83%, Na 2 O0.76%. Main mass percentage of fly ash: SiO 2 46.63%, Al 2 o 3 37.47%, Fe 2 o 3 3.26%, CaO5.75%, TiO 2 1.62%, SO 3 0.94%, K 2 O2.42%. Main mass percentages of ant...

Embodiment 3

[0041] (1) Briquetting: use sulfuric acid slag and fly ash as raw materials, and anthracite as reducing agent. First, the raw material and reducing agent need to be pretreated by ball milling to make the particle size less than 200 mesh and reach more than 80%; then add binder and mix thoroughly Uniform, pressed into a cylindrical briquette; wherein, the mass ratio of sulfuric acid slag, fly ash, and anthracite is 11:20:6.5; the binder is polyvinyl alcohol with a mass fraction of 10%, and the addition amount is sulfuric acid slag, powder 15wt% of the total mass of coal ash and reducing agent, the pressing force of the briquette is 11MPa.

[0042] The main raw material composition is: sulfuric acid slag main composition mass percentage: TFe=63.23%, SiO 2 3.16%, Al 2 o 3 1.42%, CaO1.07%, SO 3 1.72%, Na 2 O0.65%. Main mass percentage of fly ash: SiO 2 37.54%, Al 2 o 3 48.35%, Fe 2 o 3 2.81%, CaO4.96%, TiO 2 1.47%, SO 3 0.88%, K 2 O2.28%. Main mass percentage of anth...

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Abstract

The invention discloses a method for full resource utilization of sulfuric-acid residue and fly ash. The method mainly comprises of (1) briquetting, specifically, completely and uniformly mixing sulfuric-acid residue, fly ash, a reducing agent and a binder, and pressing into a cylindrical briquette, the binder being polyvinyl alcohol with a mass fraction of 10%-15%; (2) drying, specifically, drying the cylindrical briquette in a drying oven to remove redundant moisture; (3) co-reduction, specifically, performing a co-reduction reaction on the dried cylindrical briquette at 1280-1360 DEG C, andprotective atmosphere being argon; and (4) magnetic separation, specifically, crushing, grinding, magnetic separation and drying the reduced product to obtain iron-silicon alloy powder. According tothe method, the sulfuric-acid residue and fly ash composite solid waste is used as a main raw material, the comprehensive utilization effect of various solid wastes is achieved, ferrosilicon alloy required by steelmaking enterprises is produced by adopting internal carbon co-reduction through reasonable proportioning, and the ferrosilicon alloy produced through sulfuric-acid residue and fly ash coal-based co-reduction comprises the following main components of, in percentage, 68%-74% of Fe, 16%-19% of Si, less than 0.06% of P and less than 0.06% of S.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial solid waste, in particular to a method for full resource utilization of sulfuric acid slag and fly ash. 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 is 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 valuable metal components contained in industrial ...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22C38/02C22B7/00C22B21/00C01F7/02
CPCC01F7/021C01P2006/80C21B13/0066C22B7/001C22B21/00C22C38/002C22C38/02Y02P10/20
Inventor 雷家柳陈跃谢陆宇怡吴锋汪云张青
Owner HUBEI POLYTECHNIC UNIV