Novel process for improving grade of sulfate cinder iron

A technology of sulfuric acid slag and iron grade, applied in solid separation, wet separation, chemical instruments and methods, etc., can solve the problems of inability to obtain economic benefits, low iron recovery rate, difficult to treat waste liquid, etc. The effect of increasing ore volume, recovery rate and reducing grinding cost

Inactive Publication Date: 2013-07-03
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to finely grind the raw ore to a fineness of -200 mesh (-0.074mm) above 80%, and some even need to reach -200 mesh 95%, resulting in a low iron recovery rate of only 50-70%. , up to 80% in very few cases, part of the sulfuric acid slag is affected by its own properties, the iron grade of iron concentrate can only reach 50-55%, further increasing the iron grade will greatly reduce the recovery rate, and it is impossible to obtain considerable economic benefits
At present, the method to improve the recovery rate is to directly produce refined iron powder. This method introduces hydrometallurgical processes such as acid-base leaching, which complicates the process and produces difficult-to-handle waste liquid, which pollutes the environment.

Method used

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  • Novel process for improving grade of sulfate cinder iron
  • Novel process for improving grade of sulfate cinder iron
  • Novel process for improving grade of sulfate cinder iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material is sulfuric acid slag produced by an acid factory in Guangxi. The raw material contains about 44% iron grade and about 80% +0.15mm particle size. Using shaker gravity separation, when the grinding fineness is -0.074mm 90%, the iron grade is 61%, and the recovery rate is 51%. After adopting the new process of the invention, when the iron grade is 61%, the recovery rate can reach 58%, which is 7 percentage points higher than the recovery rate of the traditional process.

[0021] use as figure 1 Shown technological process, concrete operation is as follows:

[0022] (1) The raw material enters the grinding system, so that the fineness of the material reaches -0.074mm 60%, and the iron is initially dissociated;

[0023] (2) Obtain coarse concentrate and tailings through shaker gravity separation;

[0024] (3) Use 0.15mm, 0.18mm, 0.25mm sieves to sieve 1000g of crude concentrate samples for particle size sieving, and analyze the iron grade distribution o...

Embodiment 2

[0032] The sulfuric acid slag from an acid factory in Hebei has a raw material iron grade of about 38% and a particle size of +0.15mm of about 70%. Using shaker gravity separation, when the grinding fineness is -0.074mm 85%, the iron grade is 60%, and the recovery rate is only 37%. After adopting the new process of the invention, when the iron grade is 60%, the recovery rate reaches 43%, which is 6 percentage points higher than the recovery rate of the traditional process.

[0033] use as figure 1 Shown technological process, concrete operation is as follows:

[0034] (1) The raw material enters the grinding system, so that the fineness of the material reaches -0.074mm 50%, and the iron is initially dissociated;

[0035] (2) Obtain coarse concentrate and tailings through shaker gravity separation;

[0036] (3) Use 0.15mm, 0.18mm, 0.25mm sieves to sieve 1000g of crude concentrate samples for particle size sieving, and analyze the iron grade distribution of each particle size...

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Abstract

The invention relates to a novel process for improving the grade of sulfate cinder iron. After a sulfate cinder raw material is simply and crudely ground, a rough concentrate is obtained by using a conventional process, the rough concentrate is subjected to granularity sieving and grading, the selected ore is finely ground and quickly settles to obtain an underflow concentrate. And after the underflow concentrate is combined with the selected ore, the concentrate is obtained finally. The novel process is easy to construct and go into operation. After the process is improved, the ore grinding amount is reduced, the ore grinding time is shortened, and the ore grinding cost is greatly reduced by 50 to 70 percent. Meanwhile, the newly added process and equipment belong to physical separation, so energy consumption is low and pollution is not caused.

Description

technical field [0001] The invention relates to a method for producing iron fine powder by utilizing sulfuric acid slag, in particular to a new process for improving the grade of iron in the production of iron fine powder from sulfuric acid slag. Background technique [0002] Sulfuric acid slag is a solid waste produced from sulfuric acid production from pyrite. Since the slag is rich in iron, refined iron powder can be produced through a sorting process as a raw material for ironmaking. The iron grade in sulfuric acid slag is generally 30-50%. The traditional treatment method is to enrich iron through grinding, magnetic separation, gravity separation and other steps to obtain iron concentrate with iron grade > 60%. However, this method needs to finely grind the raw ore to a fineness of -200 mesh (-0.074mm) above 80%, and some even need to reach -200 mesh 95%, resulting in a low iron recovery rate of only 50-70%. , up to 80% in very few cases, part of the sulfuric acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/04B03B7/00C22B1/00
Inventor 李岩徐政杨丽梅卢孟生
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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