Zinc-containing pyrite cinder processing method

A technology of sulfuric acid slag and a treatment method, which is applied in the field of beneficiation and metallurgy, can solve the problem that the valuable components of sulfuric acid slag resources are not well utilized, and achieve the effects of low cost, reduced pollution and improved recovery.

Active Publication Date: 2015-01-28
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Based on the above technical conditions, the valuable components in a lar

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  • Zinc-containing pyrite cinder processing method

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Example Embodiment

[0027] Example 1

[0028] The treatment method of zinc-containing sulfuric acid slag in this embodiment (such as figure 1 (Shown), specifically including the following steps: 1 ton of sulfuric acid slag raw material containing 45.52% iron, 2.48% zinc, and 1.84% sulfur is ground to a fineness of less than 74μm accounting for 90%, and the magnetic field strength Magnetic separation is carried out in a 0.4T magnetic separator, which is a rough separation; the obtained coarse iron concentrate is subjected to desulfurization operation, the concentration of the coarse iron concentrate obtained by magnetic separation is concentrated to 40%, and then it is added to the mixing tank, and 1kg is added Hydrochloric acid and 1kg sulfuric acid were stirred and acidified at room temperature for 8 minutes at a stirring speed of 150rpm. After solid-liquid separation, the high-quality iron ore containing iron grade was 57.18%, and the recovery rate was 70.53%; add 20g / The sodium sulfide of L can...

Example Embodiment

[0029] Example 2

[0030] The method for treating zinc-containing sulfuric acid slag in this embodiment specifically includes the following steps: 1 ton of sulfuric acid slag containing 50.15% iron, 2.92% zinc, and 2.17% sulfur is ground to a fineness of After 85% is less than 74μm, the magnetic separation is carried out in a magnetic separator with a magnetic field strength of 0.3T, which is a rough separation; the obtained coarse iron concentrate is desulfurized, and the concentration of the coarse iron concentrate obtained by magnetic separation is concentrated to After 33%, add 1.2kg of hydrochloric acid and 1.2kg of sulfuric acid for acidolysis at room temperature for 10 minutes. The stirring speed is 180rpm. After solid-liquid separation, the iron content of high-quality iron concentrate is 58.23%, and the recovery rate is 72.85%. ; Add 25g / L of sodium sulfide to the liquid obtained from solid-liquid separation to sulfide and precipitate the zinc, and a zinc concentrate wit...

Example Embodiment

[0031] Example 3

[0032] The method for processing zinc-containing sulfuric acid slag in this embodiment specifically includes the following steps: 1 ton of sulfuric acid slag containing iron is 52.87%, zinc content is 3.25%, and sulfur content is 2.81%. After 74μm accounts for 80%, the magnetic separation is carried out in a magnetic separator with a magnetic field strength of 0.2T, which is a rough separation; the obtained coarse iron concentrate is desulfurized, and the concentration of the coarse iron concentrate obtained by magnetic separation is concentrated to 30 After %, add 1.5kg of hydrochloric acid and 1.5kg of sulfuric acid for acidolysis at room temperature for 9 minutes with stirring at 200rpm. After solid-liquid separation, the iron content of high-quality iron concentrate is 60.25%, and the recovery rate is 75.92%; Add 30g / L of sodium sulfide to the liquid obtained from solid-liquid separation to sulfide and precipitate the zinc, and a zinc concentrate with a zin...

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Abstract

The invention discloses a zinc-containing pyrite cinder processing method, and belongs to the technical field of mineral processing metallurgy. The method comprises the steps of selection of a pyrite cinder raw material, grinding, magnetic separation of iron ore, sulfur removal and sulfide precipitation of zinc. Iron ore magnetic separation of a pulp obtained after the selection of the raw material and grinding comprises one-time coarse roughing; coarse iron concentrate obtained after the coarse roughing is desulphurized, hydrochloric acid and sulfuric acid are adopted as a mixed sulfur leaching agent in the desulphurization work to carry out stirring leaching, and solid-liquid separation is carried out to obtain high quality iron concentrate; and sodium sulfide is added to a liquid obtained after the solid-liquid separation to carry out sulfide precipitation, solid-liquid separation is further carried out to obtain high quality zinc concentrate, and the remaining liquid returns to be used in a separation and metallurgy combination system. The method has the advantages of good recovery effect of iron and zinc resources in the pyrite cinder, high grade and high recovery rate of the obtained concentrate, good environmental benefit, simple operation, and suitableness for popularization and application.

Description

technical field [0001] The invention relates to a method for treating zinc-containing sulfuric acid slag, which belongs to the technical field of mineral processing and metallurgy. Background technique [0002] Sulfuric acid slag refers to the slag discharged during the process of producing sulfuric acid with pyrite as raw material. For a long time, since the sulfur grade of the pyrite raw material used to prepare sulfuric acid is generally 32% to 45%, a large amount of sulfuric acid is produced after firing sulfuric acid. The sulfuric acid slag contains 40%-50% iron and 1-2% sulfur. Some sulfuric acid slag also contains copper, lead, zinc and other non-ferrous metals and harmful elements such as arsenic, so the sulfuric acid slag is mainly used as waste For every 1 ton of sulfuric acid produced, about 0.8 to 1.5 tons of sulfuric acid cinders are discharged, causing serious environmental pollution. [0003] Using pyrite to directly produce sulfuric acid, and simultaneously ...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 刘丹
Owner KUNMING UNIV OF SCI & TECH
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