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Process for extracting iron in sulfuric-acid slag through auxiliary-strengthening acid leaching method

A technology of sulfuric acid slag and acid leaching, applied in the direction of improving process efficiency, etc., can solve the problems of high equipment material requirements, large amount of additives, and secondary pollution of the environment, so as to improve the leaching rate and reduce the cost of additives , the effect of low acid leaching temperature

Active Publication Date: 2019-03-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported auxiliary acid leaching method still has major deficiencies such as a large amount of additives and a large amount of slag, and the process has high requirements on equipment materials, high energy consumption, and easy to cause secondary pollution to the environment. The operation also has certain dangers, thus limiting the industrial application of the method

Method used

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  • Process for extracting iron in sulfuric-acid slag through auxiliary-strengthening acid leaching method
  • Process for extracting iron in sulfuric-acid slag through auxiliary-strengthening acid leaching method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Get sulfuric acid slag 100g (iron content is 56.04%, the same below), add 10gH 2 C 2 o 4 Auxiliary, mixed evenly, put it into a 1000mL normal-pressure reactor, add a sulfuric acid solution with a mass concentration of 30% according to a solid-to-liquid ratio of 1:8, stir and react in a constant temperature water bath at 60°C for 6 hours, and filter to obtain an acid dipping solution. The acid leaching solution was tested, and the iron leaching rate was 90%.

Embodiment 2

[0033] Take sulfuric acid slag 100g, add 15gH 2 C 2 o 4 Auxiliaries, mixed evenly, put into a 1000mL normal-pressure reaction kettle, add a sulfuric acid solution with a mass concentration of 40% according to a solid-to-liquid ratio of 1:6, stir and react in a constant temperature water bath at 80°C for 8 hours, filter to obtain an acid dipping solution, and The acid leaching solution was tested, and the iron leaching rate was 93%.

Embodiment 3

[0035] Get sulfuric acid slag 100g, add 20g (NH 4 ) 2 C 2 o 4 Auxiliary, mixed evenly, put it into a 1000mL normal-pressure reaction kettle, add a sulfuric acid solution with a mass concentration of 50% according to a solid-to-liquid ratio of 1:6, stir and react in a constant temperature water bath at 95°C for 8 hours, filter to obtain an acid dipping solution, and The acid leaching solution was tested, and the iron leaching rate was 97%.

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Abstract

The invention discloses a process for extracting iron in sulfuric-acid slag through an auxiliary-strengthening acid leaching method. The process for extracting iron in sulfuric-acid slag through the auxiliary-strengthening acid leaching method comprises the steps that sulfuric-acid slag and an auxiliary are evenly mixed in a certain proportion and are placed into a normal-pressure reaction kettle,a sulfuric acid solution with the mass concentration of 30%-50% is added in a certain solid-liquid ration, and heating and stirring are conducted for a reaction; and solid-liquid separation is conducted after the acid leaching reaction is completed, iron deposition is conducted on acid-leaching filtrate containing iron ions, oxalate ions and the like, impurities in an iron-deposited filter cake are removed for preparing an iron product, and the filtrate containing (NH4)2C2O4 is returned to the acid leaching procedure to be reused. Compared with an existing method for extracting iron in sulfuric-acid slag, the process for extracting ion in sulfuric-acid slag through the auxiliary-strengthening acid leaching method has the advantages that the acid leaching temperature is relatively low, theiron leaching rate is high, the quantity of slag is small, and the cost of the auxiliary is low.

Description

technical field [0001] The invention relates to a process for extracting iron from sulfuric acid slag by means of an auxiliary agent-enhanced acid leaching method. Background technique [0002] my country is a big producer of sulfuric acid, and its output ranks third in the world. The production of acid by pyrite roasting is one of the main sources of sulfuric acid in my country. According to statistics, at present, about 0.8-1.1 tons of cinders are produced for every 1 ton of sulfuric acid produced, and about 700×10 4 t waste residue. A large number of waste residues are disposed of in landfill or directly piled up, which not only wastes resources and occupies a large amount of land, but also causes varying degrees of pollution to the soil environment, water body and atmospheric environment. With the depletion of mineral resources and the massive utilization of iron ore, the comprehensive utilization of sulfuric acid slag has been widely concerned in recent years. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/08
CPCC22B3/08C22B7/007C22B7/04Y02P10/20
Inventor 王百年方晓宇杨保俊陈义雯童佳佳
Owner HEFEI UNIV OF TECH
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