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Method for recycling iron resource from soft manganese ore leaching slag

A technology for leaching slag and pyrolusite, which is applied in the field of recycling iron-containing waste slag, can solve the problems of waste of iron resources and secondary pollution of the environment, and achieve the effects of avoiding waste, low cost, and reducing secondary pollution

Active Publication Date: 2017-12-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of iron-manganese slag cannot be used as raw material for pyrometallurgy, but if it is stacked arbitrarily without treatment, it will not only waste a lot of iron resources, but also cause secondary pollution to the environment

Method used

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  • Method for recycling iron resource from soft manganese ore leaching slag
  • Method for recycling iron resource from soft manganese ore leaching slag
  • Method for recycling iron resource from soft manganese ore leaching slag

Examples

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Effect test

Embodiment 1

[0031] A method for recovering iron resources from pyrolusite leaching slag, the operation steps are as follows:

[0032] (1) Leaching: use oxalic acid solution with oxalic acid concentration of 1.5mol / L as leaching agent, after measuring the iron content in pyrolusite, mix oxalic acid solution with pyrolus slag according to the molar ratio of oxalic acid and iron as 3:1 Slurry, leaching for 4.5 hours at a temperature of 95°C and a stirring speed of 250r / min, so that the iron in the soft manganese slag is converted into soluble iron oxalate;

[0033] (2) Solid-liquid separation: centrifuging the leached slurry in step (1) to obtain waste residue and leachate containing ferric oxalate;

[0034] (3) Immerse iron in phosphate: add phosphoric acid to the leachate obtained in step (2), the molar ratio of the amount of phosphoric acid added to the iron in the leachate is 0.9:1, stirring and reacting for 1h under the condition that the rotating speed is 100r / min makes the oxalic acid...

Embodiment 2

[0038] A method for recovering iron resources from pyrolusite leaching slag, the operation steps are as follows:

[0039] (1) Leaching: Use a mixed solution with an oxalic acid concentration of 1.5mol / L and an ammonium oxalate concentration of 0.5mol / L as a leaching agent. After measuring the iron content in pyrolusite, the molar ratio of oxalate to iron is 2:1 , wherein the molar ratio of oxalic acid to iron is 1.5:1, the mixed solution is mixed with soft manganese slag to make pulp, and stirred and leached for 6 hours at a temperature of 90°C and a stirring speed of 300r / min, so that the iron in the soft manganese slag into soluble ferric oxalate;

[0040] (2) Solid-liquid separation: press-filter the slurry after leaching in step (1) to obtain waste residue and leachate containing ferric oxalate;

[0041](3) Phosphate heavy iron: add phosphoric acid in step (2) gained leaching solution, the mol ratio of the addition of phosphoric acid and iron in leaching solution is 0.95:...

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Abstract

The invention provides a method for recycling iron resource from soft manganese ore leaching slag. The method comprises the following steps: (1) preparing pulp with soft manganese ore slag by taking a mixed solution of an oxalic acid solution or oxalic acid and an oxalate solution as a leaching agent, so that iron in the soft manganese ore leaching slag is converted into soluble iron oxalate; (2) performing liquid-solid separation to obtain waste slag and iron oxalate-containing leaching liquid; (3) adding phosphoric acid or a phosphoric acid solution into the iron oxalate-containing leaching liquid, converting the iron oxalate into iron phosphate precipitate, and performing solid-liquid separation to obtain iron phosphate and a separating liquid; (4) washing and drying the obtained iron phosphate to obtain an iron phosphate product; and (5) taking the separating liquid obtained in the step (3) as the leaching agent to continue leaching the iron in the soft manganese ore leaching slag, and forming a recycling process in such a manner. According to the method provided by the invention, the iron resource in the soft manganese ore leaching slag can be recycled and utilized, and meanwhile, environmental harm of the soft manganese ore leaching slag is reduced.

Description

technical field [0001] The invention belongs to the field of recycling iron-containing waste residues, and in particular relates to a method for recovering iron resources from pyrolusite leaching residues. Background technique [0002] Manganese and iron are important raw materials for the iron and steel industry. Since 1996, my country's iron and steel output has been ranking first in the world. The rapid development of the iron and steel industry has led to a rapid increase in the demand and production of iron and manganese. Although my country's iron and manganese ore reserves are relatively rich, they are mainly poor ore. The average grade of iron ore is 32%, which is 11 percentage points lower than the world average grade. The national average grade of manganese ore is about 20%. Rich manganese ore (oxidized The reserves of manganese ore containing more than 30% manganese and manganese carbonate ore containing more than 25% of manganese only account for 6.4%. With the i...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B3/46
CPCC22B3/1616C22B3/46Y02P10/20
Inventor 孙维义苏仕军丁桑岚
Owner SICHUAN UNIV
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