Ferrochrome

Ferrochrome yog cov hlau alloy uas muaj chromium thiab hlau. Nws yog ib qho tseem ceeb alloy additive nyob rau hauv steelmaking. Raws li cov ntsiab lus sib txawv, ferrochrome tau muab faib ua cov pa roj carbon monoxide siab (cov ntsiab lus carbon yog 4 ~ 8%), nruab nrab carbon ferrochrome (cov ntsiab lus carbon yog 0.5 ~ 4%), cov pa roj carbon tsawg ferrochrome (cov ntsiab lus carbon yog { {5}}.15~0.5{{10}}%), micro-carbon ferrochrome (carbon ntsiab lus yog 0.06%), ultra-carbon ferrochrome (cov ntsiab lus carbon tsawg dua 0.03 %), thiab silicon chromium alloy, ferrochrome nitride, thiab lwm yam.
Qhov qis dua cov ntsiab lus ntawm ferrochrome, qhov nyuaj dua yog los tswj cov smelting, lub zog noj yog loj, tus nqi siab, thiab ferrochrome nrog cov ntsiab lus carbon tsawg dua 2% yog tsim rau smelting stainless hlau, acid- resistant steel thiab lwm yam tsawg-carbon chromium hlau. Ferrochrome nrog cov ntsiab lus carbon ntau dua 4%, feem ntau yog siv los kho cov pob bearing steel thiab steel rau tsheb qhov chaw. Ferrochrome muaj txog 5% chromium tuaj yeem siv los ua tus neeg sawv cev chrome rau hlau hloov hlau.

An iron alloy with chromium and iron as its main components. It is one of the main alloying agents used in the iron and steel industry. Besides the main components chromium and iron, it also contains impurities such as carbon, silicon, sulfur and phosphorus. Ferrochrome chromium containing 55% ~ 75%, according to the carbon content is divided into high carbon (C) (4% ~ 10%, the carbon (C) (0.5% ~ 4%, low carbon (>{{0}}.15% ~ 0.5% C) thiab (C) 0.15% lossis tsawg dua ntawm carbon ferrochrome. High carbon ferrochrome tseem hu ua carbon ferrochrome, nruab nrab, qis thiab micro carbon ferrochrome tseem hu ua refined ferrochrome. Lub siab carbon ferrochrome uas ua los ntawm chromium ore nrog qis piv ntawm ferrochrome, muaj Cr 50% ~ 55% hu ua tus nqi qib ferrochrome, thiab nitrogen muaj N2% ~ 10% ntawm ferrochrome raws li nitrogen alloying tus neeg sawv cev, kuj hu ua ferrochrome nitride.

Muaj li ntawm 50 hom chrome-muaj minerals pom nyob rau hauv cov xwm, uas yog oxides, chromates thiab silicates feem. Tsis tas li ntawd, muaj ob peb hydroxides, iodate, nitride thiab sulfide. Chromium nitride thiab chromium sulfide minerals tsuas pom nyob rau hauv meteorites. Chromium minerals uas muaj nqi muaj nyob rau chromium spinel minerals, lawv cov tshuaj formula yog (Mg, Fe2+) (Cr, Al, Fe3+) 2O4 los yog (Mg, Fe2+) O (Cr, Al, Fe3+) 2O3, nws cov ntsiab lus Cr2O3 yog 18% ~ 62%.
Feem ntau chromium minerals yog:
(1) Chromite, tshuaj muaj pes tsawg leeg ntawm (Mg, Fe) Cr2O4, nruab nrab ntawm ferrochromite (FeCr2O4, muaj FeO 32.09%, Cr2O3 67.91%) thiab magnesium chromite (MgCr2O4, muaj Mg 20.96%, Cr2O{15). }}.04%), Ferrochromite thiab magnesium chromite tseem hu ua chromite. Chromite yog equiaxed siv lead ua, cov siv lead ua yog me me octahedron, feem ntau granular thiab ntom blocky aggregate, xim yog tsaus, cov kab txaij yog xim av, semi-metallic luster, hardness 5.5, ntom 4.2 ~ 4.8, nrog tsis muaj zog hlau nplaum. Chromite yog magmatic keeb kwm ntxhia, uas tshwm sim hauv pob zeb ultrabasic. Thaum cov pob zeb muaj pob zeb muaj kev puas tsuaj los ntawm huab cua, chromite feem ntau hloov mus rau qhov chaw ore. Chromite yog cov khoom siv tseem ceeb tshaj plaws rau cov khoom siv chromium smelting, thiab cov hlau tsis muaj zog tuaj yeem siv los ua cov ntaub ntawv qib siab refractory.
(2) Chromium-nplua nuj SPAR, tseem hu ua ferrochrome spinel lossis txhuas chromite, tshuaj muaj pes tsawg leeg yog Fe (Cr, Al) 2O4, muaj Cr2O3 32% ~ 38%.
(3) Hard chromium spinel, tshuaj muaj pes tsawg leeg ntawm (Mg, Fe) (Cr, Al) 2O4, muaj Cr2O3 32% ~ 50%. Lub morphology, lub cev muaj zog, keeb kwm, tshwm sim thiab siv chrome-nplua nuj SPAR thiab nyuaj chrome-spinel yog tib yam li cov chromite. Kev tsim khoom ntawm chromium hlau txoj kev suav nrog aluminium txo, txo silicon, carbon txo thiab electrolysis.
Kev siv cov chromite
Chromium yog ib qho ntawm cov khoom siv tseem ceeb. Nws muaj cov yam ntxwv ntawm kev ua haujlwm zoo, hnav tsis kam, kub tsis kam thiab corrosion kuj. Nws siv chromite yog: [4]
(1) Hauv kev lag luam metallurgical? Chromite feem ntau yog siv los tsim chromite alloys thiab hlau chromium. ib tug chromium hlau alloy raws li cov hlau additive los tsim ntau yam muaj zog, corrosion kuj, hnav tsis kam, kub tsis kam, oxidation kuj ntawm tshwj xeeb hlau? Xws li stainless hlau, acid-resistant steel, tshav kub-resistant steel, pob bearing steel, caij nplooj ntoos hlav steel, cuab yeej hlau thiab lwm yam b hlau chromium yog tsuas yog siv rau smelting tshwj xeeb alloys nrog cobalt, npib tsib xee, tungsten thiab lwm yam khoom. Cov hlau tshwj xeeb thiab cov alloys tshwj xeeb no yog cov khoom siv tsis tseem ceeb rau kev tsim phom, foob pob hluav taws, foob pob hluav taws thiab nkoj hauv aviation, aerospace, automotive, shipbuilding thiab lub teb chaws tiv thaiv kev lag luam.
(2) Hauv refractories? Chromite yog siv los ua chrome cib, chrome magnesia cib thiab lwm yam khoom tshwj xeeb refractory.
(3) Hauv kev lag luam tshuaj yog siv los tsim sodium dichromate? Thiab tom qab ntawd ua lwm cov chromium compounds? Siv nyob rau hauv cov xim, textile, electroplating, tanning thiab lwm yam lag luam? Nws tuaj yeem tsim cov catalysts thiab catalytic agents. Vim li cas? Chromite muag channel kuj muaj peb hom? Qhov ntawd yog? Kev lag luam metallurgical, refractory kev lag luam thiab tshuaj lom neeg kev lag luam. Hauv qab no yog kev siv chromite hauv kev lag luam metallurgical los qhia txog kev siv thiab smelting txheej txheem ntawm ferrochrome thiab chromium ntsev
Chromium yog ib qho ntawm cov khoom siv tseem ceeb, vim tias nws cov khoom zoo, hnav tsis kam, kub tsis kam, corrosion kuj thiab lwm yam khoom, hauv kev lag luam metallurgical, cov ntaub ntawv refractory thiab tshuaj lom neeg kev lag luam tau dav siv.