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Method for extracting high-grade powdered iron from low-grade sulfuric-acid residue

A sulfuric acid slag and high-grade technology, which is applied in the field of iron fine powder production, can solve the problems of large fluctuations, difficult filtration of filter residues, and high temperature in the melting process, and achieve the reduction of hydrothermal temperature, low temperature, total iron content and recovery rate. Effect

Inactive Publication Date: 2014-11-19
WUHAN SUNEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the temperature in the melting process is high and fluctuates greatly, and some iron oxides and gangue minerals undergo olivine or lithification under the conditions of alkaline sodium, calcium and magnesium ions, resulting in crystallization and nodulation. Difficult to filter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: The raw material comes from pyrite slag from an enterprise in Luxi, Hunan. The sulfuric acid slag is brownish red, mainly hematite, and has relatively high alkaline minerals and sulfur content.

[0027] Take 100 g of sulfuric acid slag with an iron grade of 38.04%, without grinding, fully mix with 300 mL of 1% aqua regia (or perchloric acid), react at room temperature for 60 minutes, and filter to obtain pretreatment filter residue 1 and pretreatment Filtrate 1, pretreatment filtrate 1 can be used to treat sulfuric acid slag after recovery or as dilute acid in the subsequent treatment steps, after 3 to 5 cycles, add lime water to pretreatment filtrate 1 until the pH value of pretreatment filtrate 1 reaches 9 to 10, filter to remove the precipitate, and discharge the filtered liquid when the pH is adjusted to 6 to 9 through the adjustment tank; fully mix the pretreated filter residue 1 with 80mL of 50% sodium carbonate solution, and then place it in a hydrother...

Embodiment 2

[0034] Example 2: The raw material comes from pyrite slag from an enterprise in Luxi, Hunan. The sulfuric acid slag is brownish red, mainly hematite, and has relatively high alkaline minerals and sulfur content.

[0035]Take 100 g of sulfuric acid slag with an iron grade of 37.90%, without grinding, fully mix it with 400 mL of 3% nitric acid, react at room temperature for 45 minutes, and filter to obtain pretreatment filter residue 2 and pretreatment filtrate 2, pretreatment filtrate 2 After recovery, it can be used to treat sulfuric acid slag or as dilute acid in the subsequent treatment steps. After 3 to 5 cycles, add lime water to the pretreatment filtrate 2 until the pH value of the pretreatment filtrate 2 reaches 9 to 10, and filter to remove the precipitate. , the filtered liquid is discharged when the pH is adjusted to 6-9 through the adjustment tank; the pretreated filter residue 2 is fully mixed with 60mL of 30% potassium hydroxide solution, and then placed in a hydrot...

Embodiment 3

[0042] Example 3: The raw material comes from a certain sulfuric acid factory in Huayuan, Hunan. The sulfuric acid slag is black and mainly consists of magnetite, and the content of alkaline minerals and sulfur is relatively high.

[0043] Get iron grade and be 40.56% sulfuric acid slag 100g, do not need grinding, directly with the pretreatment filtrate 2 that 300mL embodiment 2 produces fully mix, filter after reacting at room temperature 30 minutes, obtain pretreatment filter residue 3 and pretreatment filtrate 3, After the pretreatment filtrate 3 is recovered, it can be used to treat the sulfuric acid slag or as a dilute acid in the subsequent treatment steps. After recycling for 3 to 5 times, lime water is added to the pretreatment filtrate 3 until the pH value of the pretreatment filtrate 3 reaches 9 to 10. , filter to remove the precipitate, discharge the filtered liquid when the pH is adjusted to 6-9 through the adjustment tank, and then discharge the pretreatment filtra...

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Abstract

The invention discloses a method for extracting high-grade powdered iron from low-grade sulfuric-acid residue. The method comprises the following steps of leaching pretreatment, hydrothermal treatment, washing and dilute acid soaking. According to leaching pretreatment, the sulfuric-acid residue and leaching medicaments are evenly mixed, react for 30 minutes to 120 minutes and then are filtered to obtain pretreatment filter residue and pretreatment filter liquor; according to hydrothermal treatment, the pretreatment filter residue and extractants are evenly mixed, and carry out hydrothermal reaction at the temperature of 120 DEG C to 250 DEG C for at least two hours to obtain hydrothermal materials; according to washing, the hydrothermal materials are dissolved with the sufficient amount of water and then are filtered, and washing filter residue and washing filter liquor are obtained; according to dilute acid soaking, dilute acid is used for soaking and washing the filter residue, the filter residue is soaked for three to 30 minutes and then is filtered, and the high-grade powdered iron and dilute acid filter liquor are obtained. The method is easy to operate and wide in application range, resources are circularly utilized, the production cost is reduced, the pollution to the environment is small, the obtained powdered iron product is stable in quality, the grade of the iron reaches 68 percent, the content of sulphur in the powdered iron is lower than 0.1 percent, and the yield of the powered iron is more than 85 percent.

Description

technical field [0001] The present invention relates to a method for extracting high-grade iron fine powder from low-grade sulfuric acid slag, especially a method for enriching and extracting high-grade iron from complex, fine, low-grade, high-sulfur-containing sulfuric acid slag that is difficult to be treated by conventional mineral processing methods The method for fine powder belongs to the technical field of iron fine powder production. Background technique [0002] Sulfuric acid slag, also known as pyrite slag or pyrite slag, is an industrial solid waste slag with a relatively high iron content that is discharged after pyrite is roasted in a fluidized fluidized furnace to produce sulfuric acid. Every ton of sulfuric acid produced will produce 0.8 ~1.0 tons of slag. At present, the annual discharge of iron with sulfuric acid slag in our country is about 5 million tons, which is equivalent to the annual concentrate output of an iron mine with an annual mining capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00
CPCY02P10/20
Inventor 田熙科周富春杨超罗东岳王龙艳朱蕾
Owner WUHAN SUNEN TECH
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