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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above technical conditions, the valuable components in a large amount of sulfuric acid slag resources have not been well utilized at present.

Method used

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  • Zinc-containing pyrite cinder processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The treatment method of zinc-containing sulfuric acid slag described in this embodiment (such as figure 1 shown), specifically including the following steps: Grinding 1 ton of sulfuric acid slag raw materials containing 45.52% iron, 2.48% zinc, and 1.84% sulfur until the fineness is less than 74μm, accounting for 90%, and then the Magnetic separation is carried out in a 0.4T magnetic separator, which is a rough separation; the obtained iron coarse concentrate is desulfurized, and the concentration of the iron coarse concentrate obtained by magnetic separation is concentrated to 40%, and then added to the mixing tank, adding 1kg Hydrochloric acid and 1kg sulfuric acid carried out stirring acid hydrolysis at normal temperature for 8 minutes, and the stirring speed was 150rpm. After the solid-liquid separation, the high-quality iron ore concentrate iron grade obtained was 57.18%, and the recovery rate was 70.53%. Add 20g / L of sodium sulfide is used to sulfide and precipit...

Embodiment 2

[0030] The treatment method of zinc-containing sulfuric acid slag described in this embodiment specifically comprises 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 less than 74μm accounts for 85%, magnetic separation is carried out in a magnetic separator with a magnetic field strength of 0.3T, which is a rough separation; the obtained iron coarse concentrate is desulfurized, and the concentration of the iron coarse concentrate obtained by magnetic separation is concentrated to After 33%, add 1.2kg of hydrochloric acid and 1.2kg of sulfuric acid to the stirring tank for 10 minutes of stirring and acidolysis at room temperature. The stirring speed is 180rpm. After solid-liquid separation, the grade of high-quality iron concentrate obtained is 58.23% and the recovery rate is 72.85%. Add 25g / L of sodium sulfide to the liquid obtained by solid-liquid separation to carry out sulfidation and preci...

Embodiment 3

[0032] The treatment method of zinc-containing sulfuric acid slag described in this embodiment specifically includes the following steps: grinding 1 ton of sulfuric acid slag raw materials containing 52.87% iron, 3.25% zinc, and 2.81% sulfur until the fineness is less than After 74μm accounts for 80%, magnetic separation is carried out in a magnetic separator with a magnetic field strength of 0.2T, which is a rough separation; desulfurization operation is performed on the obtained iron coarse concentrate, and the concentration of the iron coarse concentrate obtained by magnetic separation is concentrated to 30 After %, to add the mixing tank, add 1.5kg hydrochloric acid and 1.5kg sulfuric acid to carry out stirring and acidolysis at normal temperature for 9 minutes, the stirring speed is 200rpm, after the solid-liquid separation, the iron-containing grade of high-quality iron concentrate obtained is 60.25%, and the recovery rate is 75.92%; Add 30g / L of sodium sulfide to the liq...

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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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