(中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 為了徹底解決我國(guó)火法煉銻廠普遍存在的低濃度二氧化硫煙氣污染問題， 提出了一種新的火法煉銻工藝——硫化銻礦還原造锍熔煉，并采用單因素實(shí)驗(yàn)法考察了熔煉溫度、 時(shí)間以及造锍劑和添加劑的加入量等因素對(duì)金屬銻直收率的影響。 確定的最佳工藝條件： 先在1 100 ℃下熔煉2 h， 再迅速升溫至1 200 ℃下保溫50 min； 燒渣加入量為其理論量的1.2倍； 添加劑總鈉量為精礦量的10%， 其中碳酸鈉和芒硝加入量分別為精礦量的5%和24.2%。 在最優(yōu)條件下， 銻的直收率和總收率分別為82.07%和97.79%， 固硫率大于99%。
關(guān)鍵字: 硫化銻精礦； 還原造锍熔煉； 固硫； 清潔冶金
of stibnite concentrate
TANG Chao-bo, PI Guan-hua
（School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: In order to eliminate the serious environment pollution of the low concentration sulfur dioxide smoke produced commonly in our antimony smelters, the reducing-matting-smelting process, which is a new smelting process, was proposed. The effect of technical conditions such as smelting temperature, smelting time, the amount of pyrite cinder and additive on the direct recovery ratio of antimony were investigated by the method of single-factor experiment. The results show that the optimum conditions are that the reducing-matting smelting is carried out at 1 100 ℃ for 2 h, then the smelting temperature raise to 1 200 ℃ for 50 min. The amount of pyrite cinder is 1.2 times of its theoretical amount, the addition amount of soda and sodium sulfate is 5% and 24.2% to the amount of stibnite concentrate respectively, when the total amount of sodium is 10%. Under the optimum conditions, the direct and total recovery ratio of antimony is 87.02% and 97.79%, respectively, and the fixed ratio of sulfur is larger than 99%.
Key words: stibnite concentrate; reducing-matting smelting; sulfur fixation; clean metallurgy
