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A method for measuring the content of magnetic iron in steel slag and its particle size distribution

A technology of magnetic iron content and steel slag, which is applied in the direction of measuring device, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of equipment wear, narrow practical scope, large results, etc., to reduce equipment wear and energy consumption, and reduce test costs. , Use a wide range of effects

Inactive Publication Date: 2017-01-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the national standard YBT4188-2009 - "Determination of Magnetic Metal Iron Content in Steel Slag", but because the separation of steel slag and iron is difficult, it is difficult to accurately obtain the magnetic separation iron content of steel slag by pure magnetic separation process, and the result is too large
The invention patent "Detection method of iron grade of slag iron" discloses a detection method of iron slag, but it only targets the iron grade of slag iron, and has an empirical calculation formula, and its practical range is narrow
At present, the bottleneck encountered in the magnetic separation of steel slag is the poor adaptability to different steel slag treatment and serious equipment wear and tear. However, the determination of the magnetic iron particle size distribution of steel slag can really solve these problems effectively

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, a batch of steel slag from a steelmaking plant in Southwest China will be studied. Include the following steps:

[0035] 1) Crushing: Crushing a certain batch of steel slag after being released from the furnace. Used in this step is a commonly used mining crusher in the art, and its power (crushing strength) and crushing time can be adjusted as required.

[0036] 2) Sampling: Take several samples with a weight of 2003.1 g from the steel slag after the crushing treatment in step 1).

[0037] 3) Sieving: take a sample obtained in step 2) and carry out sieving processing, that is, divide this sample into five parts according to the particle size, and this embodiment can be according to [10, +∞), [5, 10), [1, 5), [0.25, 1), (-∞, 0.25) five interval ranges were screened (in mm), marked as sample Ⅰ, sample Ⅱ, sample Ⅲ, sample Ⅳ and sample Ⅴ, their weights are: M 1 =1352.1g, M 2 =224.3g, M 3 =179.9g, M 4 = 205.3g and M 5 = 41.5g.

[0038] 4) Magnetic ...

Embodiment 2

[0051] This embodiment discloses a method for improving the economical efficiency of the steel slag magnetic separation process by applying the method for determining the magnetic iron content and particle size distribution in steel slag described in Example 1. In this embodiment, the equipment and objects used in Embodiment 1 are the same as those in Embodiment 1. Just in step 1), record the power of crushing equipment and the time of crushing use;

[0052] In step 2), the number of copies of the sample taken out is two, one of which is the sample described in step 3), and the other is used as a comparison sample; measure the contrast by X-ray analysis or chemical analysis. The content of metallic iron in the sample w=46.63%.

[0053] After step 9) is completed, proceed to the following steps:

[0054] In step 10), calculate described w and w Fe The absolute value of the difference u=1.14%.

[0055] Step 11), in this embodiment, it is necessary to set threshold I=3% and t...

Embodiment 3

[0060] This embodiment applies the method of measuring the magnetic iron content and particle size distribution in steel slag described in Example 1 to the method of evaluating the utilization value of steel slag. Present embodiment carries on embodiment 2, just in step 11):

[0061] If u is greater than threshold Ⅰ, it indicates that the magnetic separation of slag is not complete, and it is necessary to increase the crushing force to crush the batch of slag more thoroughly. At this time, repeat steps 1-11, but in step 1), the crushing force is increased by increasing the power of the crushing equipment, that is, an adjustable crusher commonly used in the field is used.

[0062] If the adjustable crusher reaches the maximum power (the crushing force is adjusted to the maximum), the calculated u value is still greater than the threshold Ⅰ, which indicates that this batch of slag is difficult to recover by magnetic separation, and magnetic separation of this batch of slag shoul...

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PUM

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Abstract

The invention discloses a method for measuring content and particle size distribution of magnetic iron in steel slag. The method comprises the following steps of: performing grading and magnetic separation for the steel slag according to the particle sizes of 10mm, 5mm, 1mm and 0.25mm, and by taking the magnetic separation tails of which the particle size is less than 0.25mm as comparative reference, measuring content of magnetic iron in fine slag of each particle size grade through a specific gravity method, thereby obtaining content and particle size distribution of magnetic iron in steel slag. The method has the characteristics of accurate measurement, wide application range and low measuring cost, and needs no empirical formula. The method is especially suitable for magnetic iron grade measurement of metallic iron recycled by steel slag magnetic separation, and technology setting of graded magnetic separation production, has stronger promotional value, and is beneficial for steel slag resource recycling.

Description

technical field [0001] The invention relates to the field of slag recovery, in particular to magnetic separation recovery of steel slag. Background technique [0002] Every ton of steel produced will produce 15-20% steel slag, and steel slag contains 5-15% metallic iron and some magnetic iron oxides, so the recycling of metallic iron and magnetic iron oxide in steel slag can not only reduce the The cost creates good economic benefits, and the rational use of limited mineral resources is of great significance to ecological and environmental protection. However, due to the high hardness of steel slag, it is difficult to separate slag from iron, so the magnetic separation process of steel slag is relatively complicated and there are some difficulties. For example, the grade of magnetic iron in steel slag and magnetic separation concentrate directly affects the utilization value and utilization of steel slag; and the particle size distribution of magnetic separation iron in ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01N33/20
Inventor 刘清才兰苑培丁健刘浪徐敏人朱博洪牛德良杨强
Owner CHONGQING UNIV
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