CN103940692A

CN103940692A - Method used for detecting TFe (total ferrum) in mixed ground slag

Info

Publication number: CN103940692A
Application number: CN201410058658.8A
Authority: CN
Inventors: 刘新娣; 宋维兆; 陶志刚
Original assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2014-02-20
Filing date: 2014-02-20
Publication date: 2014-07-23

Abstract

The invention provides a method used for detecting TFe (total ferrum) in mixed ground slag. The method comprises following steps: the mixed ground slag is dried, is subjected to machine grinding for 4 to 6min, is sieved with a sieve of 80 meshes, and machine grinding and sieving are carried out for another time; screen overflow materials obtained via the two times of sieving are mixed for use; the obtained screen overflow materials and obtained screen underflow materials are weighted respectively, the weight of the screen overflow materials is recorded as m<overflow>, and the weight of the screen underflow materials is recorded as m<underflow>; the screen underflow materials are delivered into a laboratory for TFe detection, and an obtained result is recorded as X<underflow>; sample melting of the screen overflow materials is carried out, wherein 130 to 170g of a mixture of the screen overflow materials is delivered into a graphite crucible, the graphite crucible is delivered into a furnace of a RTW-09 melt physical property tester for 4 to 6h, a temperature is increased to 1550 DEG C, and is maintained for 30min, an obtained product is cooled naturally, and is subjected to hole drilling in a laboratory, powder is collected for TFe detection, and an obtained result is recorded as X<overflow>, wherein detection of 10 samples of the screen overflow materials is carried out, and an obtained average value is recorded as X<average><overflow>; and TFe amount (X<total>) of the mixed ground slag is obtained via calculation based on a formula defined in the description.

Description

A kind of method of mixing Tfe in ground-slag that detects

Technical field

The present invention relates to the full iron of ground-slag Tfe() detect, slag is polished into powder, the full iron of chemical examination that sieves, the lower Tfe of, sieve upper according to sieve, weighing scale are calculated the Tfe that mixes ground-slag.

Background technology

Product mix ground-slag after slag processing, by sintering, reclaim and use, comparatively hard owing to containing metallic particles in mixing ground-slag, after grinding, there is coarse particle (being greater than 80 orders), be less than 80 order ground-slags and can directly chemically examine Tfe, being greater than 80 object coarse particles cannot chemically examine, and being therefore greater than the coarse grained Tfe chemical examination of 80 object becomes a difficult problem, to sintering, uses and causes difficulty.

The present invention uses RTW-09 type physical properties of melt analyzer, mixing ground-slag is ground on rear sieve naturally cooling after the melting of containing metal coarse particle, after by the boring of solid-state mixing ground-slag, powder is chemically examined to full iron, weighing scale upper according to sieve, screen underflow Tfe is calculated and is mixed ground-slag Tfe, for follow-up sintering utilization provides evaluation foundation, there is important production practices meaning.

Summary of the invention

The object of the invention is to: mixing ground-slag slag is polished into powder, sieves and chemically examine full iron, and, weighing scale sieve lower Tfe upper according to sieve calculated the method for mixing ground-slag Tfe, not only simple and direct facility but also accurate.

The object of the present invention is achieved like this: a kind of method of mixing Tfe in ground-slag that detects, implement step by step;

Step 1, by the mixing ground-slag of drying, grinds 4-6min with vibrations sample grinding machine, crosses 80 mesh sieves, then its screen overflow is ground to 4-6min, crosses 80 mesh sieves, and twice screen overflow merged and used; Take respectively screen overflow and screen underflow,, under upper, the m of m, send laboratory to chemically examine under full iron X;

The molten sample test of step 2 screen overflow: the screen overflow 130-170g that gets twice merging in step 1, pack graphite crucible into, graphite crucible is placed in to the stove 4-6h of RTW-09 type physical properties of melt analyzer, be warming up to 1550 ℃, after constant temperature 30min, naturally cooling, send laboratory boring, getting powder, to chemically examine full iron X upper, and wherein the molten sample test of screen overflow is done 10, get its mean value and be X-on;

Step 3 is used following formula to calculate the full iron X total amount of mixing ground-slag:

X is total=(under the upper * X of m-going up+m under * X)/(m upper+m under).

Technical characterstic of the present invention: mix ground-slag and be greater than 80 object containing metal coarse particles after high-temperature heating, melting is integrated, its chemical analysis does not change, use RTW-09 type physical properties of melt analyzer, mixings ground-slag is ground on rear sieve naturally cooling after the melting of containing metal coarse particle, after solid-state mixing ground-slag is holed, powder is chemically examined to full iron, the lower Tfe of, sieve upper according to sieve, weighing scale are calculated and are mixed ground-slag Tfe, for follow-up sintering is used the foundation that economic evaluation is provided, show technical progress.

Embodiment

The present invention is described further in conjunction with the embodiments.

Embodiment 1

1) the mixing ground-slag sample after drying is shunk and assigns to 210g, sample is ground to 5min with vibrations sample grinding machine, cross 80 mesh sieves, then continue screen overflow to grind 5min, cross 80 mesh sieves, twice screen overflow and screen underflow are merged respectively, accurately weigh screen overflow respectively and screen underflow is respectively: m is upper, under m, send laboratory to chemically examine under full iron X screen underflow.

2) the molten sample test of screen overflow: take screen overflow 150g, pack graphite crucible into, the high temperature furnace that graphite crucible is put into RTW-09 type physical properties of melt analyzer is through 5h, be warming up to 1550 ℃, after constant temperature 30min, naturally cooling, send laboratory boring, powder is chemically examined on full iron X.

3) the molten sample test of screen overflow is done 10, get its mean value and be X-on.

4) use following formula to calculate to mix the total full iron X of ground-slag total:

X is total=(under the upper * X of m-going up+m under * X)/(m upper+m under)

Embodiment 2

Adopt in embodiment 1 1) and 2) 10, the molten sample of upper thing after step is disposed, after naturally cooling, send laboratory to hole, powder is chemically examined to full iron X above, its mean value X-be above 36.06 brings that to mix ground-slag TFe result of calculation after formula as follows into:

By upper table data, learnt: in mixing ground-slag, contain metallic particles comparatively hard, after grinding, there is coarse particle (being greater than 80 orders), be less than 80 order ground-slags and can directly chemically examine Tfe, being greater than 80 object coarse particles cannot chemically examine, by screen overflow, melting sample tests, solved and be greater than the coarse grained Tfe detection of 80 object, thereby accurately drawn mixing ground-slag Tfe by above form, solved and mixed the difficult problem that ground-slag Tfe cannot be definite.

Claims

1. detect a method of mixing Tfe in ground-slag, it is characterized in that: implement step by step;

Step 1, by the mixing ground-slag 190-220g of drying, grinds 4-6min with vibrations sample grinding machine, crosses 80 mesh sieves, then its screen overflow is ground to 4-6min, crosses 80 mesh sieves, and twice screen overflow merged and used; Take respectively screen overflow and screen underflow,, under upper, the m of m, send laboratory to chemically examine under full iron X;

X is total=(under the upper * X of m-going up+m under * X)/(m upper+m under).