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Method for preparing highly pure zinc sulfate heptahydrate from zinc-containing blast furnace gas sludge

A technology of blast furnace gas mud and zinc sulfate heptahydrate, which is applied in the direction of zinc sulfate, etc., can solve the problems of low recovery rate of physical treatment, large stockpiling area, high energy consumption of treatment, etc., achieve good economic benefits, less equipment investment, The effect of low energy consumption

Active Publication Date: 2017-04-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of high energy consumption, heavy pollution, low recovery rate of physical treatment, large stockpiles, and heavy pollution in blast furnace gas mud fire treatment, the present invention provides a full-wet pretreatment, leaching, purification, evaporation, Method for preparing high-purity zinc sulfate heptahydrate by crystallization

Method used

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  • Method for preparing highly pure zinc sulfate heptahydrate from zinc-containing blast furnace gas sludge
  • Method for preparing highly pure zinc sulfate heptahydrate from zinc-containing blast furnace gas sludge
  • Method for preparing highly pure zinc sulfate heptahydrate from zinc-containing blast furnace gas sludge

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Embodiment 1

[0022] Such as figure 1 Shown, this zinc-containing blast furnace gas mud prepares the method for high-purity zinc sulfate heptahydrate, and it comprises the following concrete steps:

[0023] (1) Firstly crush, dry and grind the massive zinc-containing blast furnace gas mud (composition analysis is shown in Table 1) to obtain powdery zinc-containing blast furnace gas mud material with a particle size of 0.074mm~0.1mm, and then add it to the sulfuric acid solution Acid leaching in medium (at 60°C and a stirring speed of 200r / min, the powdery zinc-containing blast furnace gas mud material is added to a 1.22mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:3g / ml for 10 minutes, and after leaching Set aside to settle for 10 minutes, then solid-liquid separation to obtain filter residue and filtrate), leaching ore pulp for solid-liquid separation to obtain filter residue and filtrate, add hydrogen peroxide solution and limestone to oxidize and neutralize iron precipitat...

Embodiment 2

[0031] Such as figure 1 Shown, this zinc-containing blast furnace gas mud prepares the method for high-purity zinc sulfate heptahydrate, and it comprises the following concrete steps:

[0032] (1) Firstly crush, dry and grind the massive zinc-containing blast furnace gas mud (composition analysis shown in Table 2) to obtain powdery zinc-containing blast furnace gas mud material with a particle size of 0.074mm~0.1mm, and then add it to the sulfuric acid solution Acid leaching in medium (at 60°C and a stirring speed of 200r / min, the powdery zinc-containing blast furnace gas mud material is added to a 1.5mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:5g / ml for leaching for 20min, after leaching Set aside to settle for 15 minutes, then solid-liquid separation to obtain filter residue and filtrate), leaching ore pulp for solid-liquid separation to obtain filter residue and filtrate, adding hydrogen peroxide solution and limestone to oxidize and neutralize iron precipi...

Embodiment 3

[0040] Such as figure 1 Shown, this zinc-containing blast furnace gas mud prepares the method for high-purity zinc sulfate heptahydrate, and it comprises the following concrete steps:

[0041] (1) Firstly crush, dry and grind the massive zinc-containing blast furnace gas mud (composition analysis is shown in Table 3) to obtain powdery zinc-containing blast furnace gas mud material with a particle size of 0.074mm~0.1mm, and then add it to the sulfuric acid solution acid leaching (at 60°C and a stirring speed of 200r / min, the powdery zinc-containing blast furnace gas mud material is added to a 1.38mol / L sulfuric acid solution at a solid-to-liquid ratio of 1:4g / ml for leaching for 15min, after leaching Set aside to settle for 20 minutes, then solid-liquid separation to obtain filter residue and filtrate), leaching ore pulp and solid-liquid separation to obtain filter residue and filtrate, add hydrogen peroxide solution and limestone to oxidize and neutralize iron precipitation in...

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Abstract

The invention relates to a method for preparing highly pure zinc sulfate heptahydrate from zinc-containing blast furnace gas sludge, and belongs to the technical field of comprehensive utilization of metallurgical resources. The method comprises the following steps: breaking, drying and grinding block zinc-containing blast furnace gas sludge, adding the ground zinc-containing blast furnace gas sludge to a sulfuric acid solution to carry out acid dipping, carrying out solid-liquid separation to obtain filter residues and a filtrate, adding a hydrogen peroxide solution and limestone to the filtrate in order to carry out oxidation, neutralization and iron precipitation, filtering the obtained filtrate to obtain iron-containing residues used for iron recovery and an iron removed solution; adding ZnF2 powder to the iron removed solution, stirring, reacting and precipitating the iron removed solution and the ZnF2 powder for 1-2 h, and filtering the obtained solution to obtain calcium and magnesium residues and a zinc sulfate solution; and sequentially carrying out evaporative concentration, cooling crystallization, dehydration and air drying on the zinc sulfate solution to obtain the highly pure zinc sulfate heptahydrate, and returning a mother liquor obtained in the dehydration process to the evaporative concentration process. The method effectively recovers the valuable element zinc from the blast furnace gas sludge, and allows the highly pure zinc sulfate heptahydrate to be prepared.

Description

technical field [0001] The invention relates to a method for preparing high-purity zinc sulfate heptahydrate from zinc-containing blast furnace gas mud, and belongs to the technical field of comprehensive utilization of metallurgical resources. Background technique [0002] Zinc sulfate heptahydrate (ZnSO 4 ·7H 2 O), also known as zinc alum, alumite, white crystals, is an important inorganic chemical raw material. At present, zinc sulfate has been widely used in industry, agriculture and medical and health fields, and its demand is increasing year by year. It is used as a bacteriostatic agent in mineral processing and used to prepare electrolyte in electroplating industry. Zinc sulfate is the raw material for making lithopone and zinc salt, and also used as auxiliary raw material for wood and leather antisepsis, bone glue clarification, man-made fiber precipitant, etc. It is mainly used as trace element fertilizer in agriculture, and zinc sulfate syrup or sugar tablets i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
CPCC01G9/06C01P2006/80
Inventor 李博尹云贵魏永刚王华
Owner KUNMING UNIV OF SCI & TECH
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