Ferrochrome, los yogferrochromium cov ntsiab lus(FeCr) yog ib hom ferroalloy, uas yog, alloy ntawm chromium thiab hlau, feem ntau muaj 50 mus rau 70% chromium los ntawm qhov hnyav.

Ferrochrome yog tsim los ntawm hluav taws xob arc carbothermic txo ntawm chromite.Feem ntau ntawm cov khoom tsim tawm thoob ntiaj teb yog tsim nyob rau hauv South Africa, Kazakhstan thiab Is Nrias teb, uas muaj cov khoom siv chromite loj hauv tsev.Kev nce nqi yog los ntawm Russia thiab Tuam Tshoj.Kev tsim cov hlau, tshwj xeeb tshaj yog cov hlau tsis muaj hlau nrog cov ntsiab lus chromium ntawm 10 mus rau 20%, yog cov neeg siv khoom loj tshaj plaws thiab cov ntawv thov tseem ceeb ntawm ferrochrome.

Kev siv

Ntau tshaj 80% ntawm lub ntiaj teb noferrochromeyog siv nyob rau hauv zus tau tej cov stainless hlau.Hauv xyoo 2006, 28 Mt stainless hlau tau tsim.Stainless hlau nyob ntawm chromium rau nws cov tsos thiab tsis kam mus corrosion.Qhov nruab nrab chrome cov ntsiab lus nyob rau hauv stainless hlau yog approx.18%.Nws kuj yog siv los ntxiv chromium rau carbon hlau.FeCr los ntawm South Africa, lub npe hu ua "them chrome" thiab tsim los ntawm Cr uas muaj cov ore nrog cov ntsiab lus carbon tsawg, feem ntau yog siv hauv cov hlau tsis muaj steel.Xwb, siab carbon FeCr uas ua los ntawm qib high-qib ore pom nyob rau hauv Kazakhstan (nrog rau lwm qhov chaw) feem ntau yog siv nyob rau hauv tshwj xeeb daim ntaub ntawv xws li engineering steels uas muaj ib tug siab Cr / Fe piv thiab yam tsawg kawg nkaus theem ntawm lwm yam (sulfur, phosphorus, titanium thiab lwm yam). ).

Ntau lawm

Kev tsim cov ferrochrome yog qhov tseem ceeb ntawm kev txo qis carbothermic ua haujlwm ntawm qhov kub thiab txias.Chromium ore (ib qho oxide ntawm Cr thiab Fe) yog txo los ntawm thee thiab coke los tsim cov hlau-chromium alloy.Lub tshav kub rau cov tshuaj tiv thaiv no tuaj yeem los ntawm ntau hom, tab sis feem ntau yog los ntawm cov hluav taws xob arc tsim ntawm cov lus qhia ntawm electrodes hauv qab ntawm lub cub tawg thiab lub cub tawg.Qhov arc no tsim qhov kub ntawm li 2,800 ° C (5,070 ° F).Nyob rau hauv tus txheej txheem ntawm smelting, loj npaum li cas ntawm cov hluav taws xob siv, ua ntau lawm kim heev nyob rau hauv lub teb chaws uas muaj hwj chim nqi siab.

Tapping ntawm cov khoom los ntawm lub cub tawg yuav siv sij hawm qhov chaw intermittently.Thaum txaus smelted ferrochrome tau sau nyob rau hauv lub cub tawg hearth, kais lub qhov yog drilled qhib thiab ib tug kwj ntawm molten hlau thiab slag rushes mus rau hauv ib tug txias los yog ladle.Ferrochrome solidifies nyob rau hauv loj castings uas yog crushed rau muag los yog ntxiv ua tiav.

Ferrochrome feem ntau cais los ntawm cov pa roj carbon thiab chrome nws muaj.Feem ntau ntawm FeCr tsim tawm yog "them chrome" los ntawm South Africa, nrog cov pa roj carbon ntau yog qhov thib ob loj tshaj plaws ua raws li cov khoom me me ntawm cov pa roj carbon tsawg thiab cov khoom siv nruab nrab.