榴莲视频app下载

新聞中心NEWS CENTER

山南合成鎂鈣砂的煅燒工藝和煅燒設備

發布日期:2022-01-21 瀏(liu)覽次數:36024

目前我國生產山南合成鎂鈣砂所使(shi)用的(de)原料(liao)(liao)有菱(ling)鎂石(shi)(shi)、白云(yun)石(shi)(shi)和(he)石(shi)(shi)灰(hui)石(shi)(shi)。所采用的(de)工(gong)(gong)藝(yi)為二步煅(duan)(duan)燒(shao)、入工(gong)(gong)合(he)成(cheng)工(gong)(gong)藝(yi)。即先將(jiang)菱(ling)鎂石(shi)(shi)、白云(yun)石(shi)(shi)和(he)石(shi)(shi)灰(hui)石(shi)(shi)在較(jiao)低的(de)溫(wen)度下(xia)輕燒(shao),生產(chan)出輕燒(shao)氧化鎂、輕燒(shao)白云(yun)石(shi)(shi)和(he)生石(shi)(shi)灰(hui)。然后進行配料(liao)(liao)、磨細、混料(liao)(liao)、成(cheng)型,最后經過高溫(wen)煅(duan)(duan)燒(shao),煅(duan)(duan)燒(shao)出不同牌號(hao)的(de)合(he)成(cheng)鎂鈣砂(sha)。具體的(de)煅(duan)(duan)燒(shao)工(gong)(gong)藝(yi)有半(ban)干法(fa)壓坯、隧道窯(yao)(yao)煅(duan)(duan)燒(shao)工(gong)(gong)藝(yi);半(ban)干法(fa)壓球(qiu)、焦(jiao)炭(tan)豎(shu)窯(yao)(yao)煅(duan)(duan)燒(shao)工(gong)(gong)藝(yi);干法(fa)壓球(qiu)、高溫(wen)燃油豎(shu)窯(yao)(yao)和(he)回轉窯(yao)(yao)煅(duan)(duan)燒(shao)工(gong)(gong)藝(yi)。

山南合成鎂鈣砂.jpg

1、半干法(fa)壓坯、隧(sui)道窯煅燒工(gong)藝該煅燒工(gong)藝

生產合成鎂鈣砂是以生石灰和輕燒氧化鎂為原料。首先將生石灰加水消化成消石灰,然后將消石灰與輕燒氧化鎂配料,經過攪拌混合,入筒磨機內共同磨細、均化,再將磨細的合成料在輪碾機內加水混合成半干料,在摩擦壓力機上壓成具有一定外形尺寸的磚坯,經過干燥,裝于隧道窯車上,推入隧道窯內高溫煅燒成合成鎂鈣砂熟料。我國某公司煅燒合成鎂鈣砂使用的隧道窯規格為104.5m×2.0m×1.2m,共52個車位,以熱發生爐煤氣為燃料,設12對套管式煤氣燒嘴,煅燒溫度1620~1650℃,年產量1.5萬t。以隧道窯作為煅燒設備煅燒溫度均勻,保溫時間長,物料達到充分燒結。因此,可獲得高致密度的合成耐火原料。

2、半干法壓球(qiu)、焦(jiao)炭豎窯煅燒工藝(yi)

該煅(duan)燒(shao)(shao)工藝生(sheng)產(chan)合(he)成鎂(mei)鈣砂是(shi)(shi)以(yi)輕燒(shao)(shao)白云(yun)石(shi)和輕燒(shao)(shao)氧(yang)(yang)化(hua)鎂(mei)為(wei)原料。將輕燒(shao)(shao)白云(yun)石(shi)和輕燒(shao)(shao)氧(yang)(yang)化(hua)鎂(mei)分(fen)(fen)別磨成細粉,計量(liang)后(hou)按比例加入(ru)輪碾(nian)機(ji)中(zhong)(zhong)再(zai)加水混(hun)合(he),混(hun)好的(de)(de)合(he)成料在(zai)雙輥壓(ya)球機(ji)上壓(ya)成料球,干(gan)燥后(hou)裝入(ru)以(yi)焦(jiao)炭(tan)或無煙(yan)煤為(wei)燃料的(de)(de)豎(shu)窯(yao)內(nei)煅(duan)燒(shao)(shao)。裝料方式是(shi)(shi)焦(jiao)炭(tan)或無煙(yan)煤和料球分(fen)(fen)層裝入(ru)。我國遼寧(ning)省(sheng)生(sheng)產(chan)合(he)成鎂(mei)鈣砂的(de)(de)企業中(zhong)(zhong),大部(bu)分(fen)(fen)采(cai)用該煅(duan)燒(shao)(shao)工藝。所用豎(shu)窯(yao)的(de)(de)規(gui)格一(yi)般為(wei)3m×16m。該煅(duan)燒(shao)(shao)工藝簡單,產(chan)品成本低,但在(zai)煅(duan)燒(shao)(shao)過程中(zhong)(zhong)料球和焦(jiao)炭(tan)混(hun)在(zai)一(yi)起,焦(jiao)炭(tan)燃燒(shao)(shao)產(chan)生(sheng)的(de)(de)灰分(fen)(fen)有一(yi)部(bu)分(fen)(fen)混(hun)入(ru)到料球中(zhong)(zhong),增加了產(chan)品的(de)(de)雜質(zhi)含量(liang)。

3、干法壓球、燃油豎窯煅燒工藝

該煅(duan)燒(shao)(shao)(shao)(shao)工(gong)(gong)藝用于生(sheng)(sheng)(sheng)產(chan)(chan)高(gao)純(chun)度(du)(du)(du)(du)合成鎂鈣砂(sha)(sha)。將高(gao)純(chun)度(du)(du)(du)(du)輕燒(shao)(shao)(shao)(shao)氧化鎂和輕燒(shao)(shao)(shao)(shao)白(bai)云(yun)石配料(liao)、混合磨細(xi)后,直(zhi)接將干粉料(liao)送入高(gao)壓(ya)壓(ya)球(qiu)機中干壓(ya)成球(qiu),然后再送入高(gao)溫(wen)(wen)燃(ran)(ran)油(you)豎窯(yao)內(nei)煅(duan)燒(shao)(shao)(shao)(shao)。這種煅(duan)燒(shao)(shao)(shao)(shao)工(gong)(gong)藝的(de)(de)優勢(shi)是燃(ran)(ran)料(liao)油(you)噴入到(dao)料(liao)層(ceng)內(nei),在料(liao)層(ceng)內(nei)部(bu)燃(ran)(ran)燒(shao)(shao)(shao)(shao),煅(duan)燒(shao)(shao)(shao)(shao)溫(wen)(wen)度(du)(du)(du)(du)高(gao),可達到(dao)1800℃以上;燃(ran)(ran)料(liao)燃(ran)(ran)燒(shao)(shao)(shao)(shao)后不產(chan)(chan)生(sheng)(sheng)(sheng)灰(hui)分,對物料(liao)的(de)(de)純(chun)度(du)(du)(du)(du)沒(mei)有(you)影響。目前(qian),國內(nei)采(cai)用該煅(duan)燒(shao)(shao)(shao)(shao)工(gong)(gong)藝生(sheng)(sheng)(sheng)產(chan)(chan)合成鎂鈣砂(sha)(sha)的(de)(de)企業,只有(you)南方一(yi)家公司(si)。該公司(si)燃(ran)(ran)油(you)豎窯(yao)的(de)(de)規(gui)格為(wei)φ1.75m×11.5m,窯(yao)的(de)(de)工(gong)(gong)作襯用高(gao)純(chun)度(du)(du)(du)(du)堿(jian)性(xing)耐火制品砌(qi)筑(zhu),厚度(du)(du)(du)(du)為(wei)350mm。工(gong)(gong)作襯于窯(yao)體鋼殼之間(jian)用輕質保溫(wen)(wen)磚砌(qi)筑(zhu)。以重柴油(you)為(wei)燃(ran)(ran)料(liao),煅(duan)燒(shao)(shao)(shao)(shao)溫(wen)(wen)度(du)(du)(du)(du)>1800℃。設計(ji)4排燒(shao)(shao)(shao)(shao)嘴(zui),上下布置,間(jian)距900mm。每(mei)排設計(ji)16支燒(shao)(shao)(shao)(shao)嘴(zui),沿(yan)圓周(zhou)均布。采(cai)用無冷(leng)卻燒(shao)(shao)(shao)(shao)嘴(zui),每(mei)支燒(shao)(shao)(shao)(shao)嘴(zui)配一(yi)臺計(ji)量泵(beng)供油(you),一(yi)次(ci)空氣由(you)羅茨風機供應(ying)。實際生(sheng)(sheng)(sheng)產(chan)(chan)中使用一(yi)排燒(shao)(shao)(shao)(shao)嘴(zui)。連(lian)續裝窯(yao)和出窯(yao),全部(bu)自動化控制,生(sheng)(sheng)(sheng)產(chan)(chan)能力。

4、干法壓球、回轉窯煅燒工藝

目前,國內有部分企業采用高溫回轉窯煅燒合成鎂鈣砂。其煅燒工藝為:將高純度輕燒氧化鎂和高純度輕燒白云石按比例配料后,經過攪拌昆合,磨成細粉,送入高壓壓球機中干壓成球,然后送入高溫回轉窯內煅燒。如某公司采用φ2.5m×60m超高溫回轉窯煅燒合成鎂鈣砂,以重油作燃料,采用機械霧化燒嘴,窯尾設煙氣換熱器,將一次空氣預熱到450~500℃,煅燒溫度>1850℃。煅燒CaO含量20%~30%合成鎂鈣砂,產量2~2.5t/h,油耗300kg/t。


移動端網站