Method for producing fine iron powder by sulfate slag

A technology for sulfuric acid slag and iron fine powder, which is applied in the field of chemical treatment of sulfuric acid slag, can solve the problems of low iron content, harmful element content, waste of iron resources, environmental pollution, etc. , the effect of improving utilization

Inactive Publication Date: 2013-05-08
罗涛
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Sulfuric acid slag is a kind of solid waste produced in the process of producing sulfuric acid from pyrite. Due to its low iron grade and high content of harmful elements, there are currently two main uses of sulfuric acid slag: one is for low iron content. Raw materials for cement production, secondly, those with high iron content are used for steel production, and their util

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] Take a kind of sulfuric acid slag, the mass fraction of various elements is: iron 52.48%, sulfur 1.80%, arsenic 0.12%, zinc 1.18%, lead 0.66%, calcium 6.21%. Then arbitrarily take 500g of sulfuric acid residue, add 2500g of hydrochloric acid with a mass fraction of 5%, control the temperature at 80 degrees and normal pressure, stir for 60min, filter to separate solid-liquid to obtain filter residue, add 1000g of water to the filter residue, normal temperature and pressure Stir for 5 minutes, filter to separate the solid and liquid to obtain washed slag, add 1000 g of sodium hydroxide with a mass fraction of 5% to the obtained washed slag, stir at normal temperature and pressure for 60 minutes, and filter to separate the solid and liquid to obtain iron powder. , Among them, the mass fraction of the elements contained in the iron powder is: iron 60.75%, sulfur 0.24%, arsenic 0.0035%, zinc 0.76% 0., lead 0.49%, calcium 1.37%. The iron recovery rate is 8...

Example Embodiment

[0039] Embodiment 2

[0040]Take 500 g of sulfuric acid residue of Example 1, add 1500 g of hydrochloric acid with a mass fraction of 5%, control the temperature at 80 degrees and normal pressure, stir for 60 min, filter to separate solid-liquid to obtain filter residue, add 1000g of water to the filter residue, normal temperature Stir under normal pressure for 5 minutes, filter to separate the solid and liquid to obtain water-washed slag, add 1000 g of sodium hydroxide with a mass fraction of 5% to the obtained water-washed slag, stir at normal temperature and pressure for 60 minutes, and filter to separate the solid and liquid to obtain iron. Concentrated powder, wherein, the mass fraction of the elements contained in the iron fine powder is: iron 62.61%, sulfur 0.21%, arsenic 0.0038%, zinc 0.82%, lead 0.54%, calcium 0.46%. The iron recovery rate is 88.84%.

Example Embodiment

[0041] Embodiment 3

[0042] Take the sulfuric acid slag, the mass fraction of various elements contained in the test are: iron 48.24%, sulfur 3.26%, arsenic 0.24%, zinc 1.62% 0., lead 0.57%, calcium 5.77%. Then arbitrarily take 500g of sulfuric acid residue, add 2000g of hydrochloric acid with a mass fraction of 6%, control the temperature at 50 degrees and normal pressure, stir for 90min, filter to separate solid-liquid to obtain filter residue, add 750g of water to the filter residue, and add 750g of water to the filter residue. Under stirring for 4 minutes, the solid-liquid separation was achieved by filtration to obtain water-washed slag, and 1500 g of potassium hydroxide with a mass fraction of 20% was added to the obtained water-washed slag, stirred at normal temperature and pressure for 90 minutes, and filtered to separate the solid and the liquid to obtain iron powder, The mass fraction of the elements contained in the prepared iron powder is iron 58.46%, sulfur 0.28%...

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Abstract

The invention discloses a method for producing fine iron powder by sulfate slag, which is simple and high in iron recovery rate. According to the method, part of impurities in sulfate slag is removed first by acid wash and then alkaline wash, so that the grade of iron is improved to prepare fine iron powder. The sulfate slag based on weight contains 46-60% of iron. As the acid liquor is reacted with iron in the sulfate slag, technical personnel in the field are hard to imagine that the acid liquor can be used to improve the grade of iron. By means of different reaction activities of impurities in the sulfate slag and acid, an appropriate amount of acid is added to remove impurities which are easier to react with acid, and the impurities which are easy to react with alkali are removed by means of alkali wash, so that the grade of iron can be greatly improved based on simpleness and practicality. The iron recovery rate is high, and unexpected technical effects are obtained.

Description

technical field [0001] The invention relates to a chemical treatment method for sulfuric acid slag, in particular to a method for producing iron fine powder with sulfuric acid slag. Background technique [0002] my country is currently the country that produces the most steel in the world, and my country's iron ore resources are relatively short in the world. It needs to import a large amount of iron ore from abroad every year. How to make good use of existing mineral resources, especially Making good use of abandoned mineral resources is an important issue in the development of today's society. [0003] Sulfuric acid slag is a kind of solid waste produced in the process of producing sulfuric acid from pyrite. Due to its low iron grade and high content of harmful elements, there are currently two main uses of sulfuric acid slag: one is for low iron content. Raw materials for cement production, secondly, those with high iron content are used for steel production, and their ut...

Claims

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Application Information

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IPC IPC(8): C22B1/00
Inventor 罗涛
Owner 罗涛
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