Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第11卷    第4期    总第43期    2001年8月

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文章编号:1004-0609(2001)04-0721-05
平果铝厂氢氧化铝洗液最大允许全碱浓度的计算及流程改造方案
王龙章, 甘国耀, 刘保伟

(平果铝业公司, 广西平果 531400)

摘 要:   指出只有当氢氧化铝洗液中全碱浓度小于或 等于赤泥洗液中全碱浓度时,才有利于赤泥洗涤;利用2000年上半年实际生产数据,计算出氢氧化铝洗液最大允许 全 碱质量浓度为61.56g/L。分析比较了处理高浓度氢氧化铝洗液的3种方案,结果表明: 将全碱浓 度为95.06g/L的氢氧化铝洗液直接送到稀释槽,可使赤泥一洗槽溢流浓度降低约6g/L ,每吨氧化铝赤泥附碱损失减小0.25kg氧化钠,每年可节省碱耗费约54.9万元; 而且还能将氢 氧化 铝洗液中的浮游物反溶解进入稀释液,有利于精液 Rp(氧化铝与苛性氧化钠的质量比 )的提高,同时避免了其进入赤泥而被损失 ,每年可减少氧化铝损失费约35.3万元。并提出了简单可行的氢氧化铝洗液流程改造 的具体方案。

 

关键字:   氢氧化铝洗液; 全碱质量浓度; 流程改造

Calculation of permitted maximum total
soda mass concentration in aluminate hydrate
wash liquor and process change scheme
WANG Long-zhang, GAN Guo-yao, LIU Bao-wei

Pingguo Aluminum Company, Pingguo,
Guangxi 531400, P.R.China

Abstract:  It was pointed out that aluminate hydrate(AH) wash l iquor was favor to red mud washing only if its total soda concentration was less t han that of red mud wash liquor. The permitted maximum total soda concentration in AH wash liquor was 61.56g/L according to actual production data of Pinggu o Alumina Refinery in the 1st half year of 2000. Three schemes of dealing with AH wash liq uor of high soda concentration were analyzed and compared. The results show th at when the AH wash liquor of total soda concentration 95.06g/L is transferred d irectly to dilution tank, soda concentration in overflow of the 1st mud washer c ould be lowered by about 6g/L and soda loss in red mud attached liquor could be lo we red by 0.25 kg Na2O per ton of alumina and therefore saving cost of about 549 000 RMB per year; moreover, suspension in AH wash liquor could be re-dissolved in to diluted liquor and it is favor not only to rise pregnant liquor Rp andimprove precipitation process, but also to avoid alumina loss cost of about 353?000 RMB per year by the suspension settling into red mud. The simple and available sch eme for AH wash liquor process change was also proposed.

 

Key words:   aluminate hydrate wash liquor; total soda mas s concentration; process change

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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