锌精矿氧压浸出试验报告

10锌精矿氧压直接浸出试验报告在9-11浸出的试验。主要包括锌精矿氧压直接浸出的条件试验和中性浸出渣氧压直接浸出试验。在锌精矿氧压直接浸出的条件试验之后，依据得到的优化条件对四95%以上，并对锌精矿浸出液进展了几种方法的沉铁试验。锌精矿氧压直接浸出的条件摸索试验包括：1.粒度试验；2.温度试验；3．氧压试验；4.搅拌转速试验；5.时间试验：6.酸锌比试验;7.铁离子影响试验。除铁试验承受了两种方法：针铁矿除铁法和铁矾法，它们的除铁率分别在0.97g/l0.014g/l。1试验原料分析共对我厂四种锌精矿原料做了分析，结果如下：精矿编号1#锌精矿2#锌精矿3#锌精矿4#锌精矿平均值Si %1.092.241.991.961.82S %29.3328.8327.9328.0828.42Ag g/t137115122120123.5In %0.0110.0220.0250.0980.039Pb %1.952.001.792.992.183Fe %10.146.977.977.278.088Zn %47.4149.2547.4146.4247.62试验内容条件试验1 粒度试验反响条件及装料：120g锌精矿，600ml液 酸锌比1.27 搅拌转速690-710r/min,4h5：1，Fe3+5g/l,0.3Mpa,温度100℃1粒度试验结果试验编号Zn1005-1Zn0920-1Zn0921-3Zn1007-1Zn0921-2粒度〔-38微米〕%55(未磨)85.4909395磨矿时间 min036912后液体积〔ml〕660815850820760浸出渣〔g〕6155.254.25253渣率 %50.834645.1743.3344.17渣成分%Zn18.9512.7511.27.839.95Pb4.685.165.335.665.36Fe7.57.147.287.797.51In0.00260.00110.00110.00220.0012Agg/t222246260256266渣计浸出率Zn%79.4387.4889.2092.7690.62Pb1.291.510.100.041.76Fe49.9756.9056.8555.7056.47In89.1795.8595.9392.1995.66Ag5.174.911.316.791.27ZnPbZnPbFeInAg8060%率出40浸20050 60 70 80 90 100粒度过320目%图1 粒度对浸出的影响11可以看出：矿样粒度是影响金属浸出率的重要因素，磨矿不结果可知，粒度从-0.038mm<55%研磨到-0.038mm<93%,锌的浸出率从74.93%92.76%，粒度再细，对浸出影响不大，锌浸出率并没有增加，矿粉粒度90%以上。所加能耗，给液固分别带来困难。条件试验2 温度试验反响条件及装料：120g锌精矿，600ml液 ，酸度180g/l硫酸，酸锌比1.27 搅拌转速690-710r/min,浸出时间4h51F3+5g/l,氧压0.3Mpa,320目粒度90%-38微米表2 温度试验结果试验编号Zn0923-1Zn0923-2Zn0925-1Zn0921-3Zn0925-2温度℃859095100105后液体积〔ml〕790750780850770浸出渣〔g〕61.5575554.263渣率 %渣成分%51.2547.5045.8345.1752.50Zn20.1214.8713.1411.27.01Pb4.424.884.985.334.24Fe7.67.267.017.2812.08In0.00410.00260.00210.00110.0074Ag g/t渣计浸出率%273254238260219Zn77.9884.9287.1489.2092.14Pb6.013.825.290.117.63Fe48.8854.7457.8456.8516.77In82.7889.8892.1195.9368.16Ag-17.57-1.398.331.323.38ZnFeZnFePbInAg90807060%率50出40浸302010085 90 95 100 105温度℃图2 温度对浸出的影响285℃时10592.14%,锌的浸出率能到达最好的浸出效果；温度对铁的浸出率影响也格外大，温度从85℃增加到48.88%56.85%；105℃时，铁的浸出率85℃上升95.93105℃时，铟的浸出68.16%，100℃。条件试验3 氧压试验反响条件及装料120g锌精矿600ml液酸度180g/l硫酸酸锌比搅拌转速690-710r/min，浸出时间4h，液固比5：1，Fe3+5g/l,温度100℃，过320目粒度90%-38微米表3 氧分压试验结果试验编号Zn0928-1Zn0928-2Zn0921-3Zn0929-1Zn0929-2氧压MPa0.40.350.30.250.2后液体积〔ml〕620715850670600浸出渣〔g〕50.550.554.25264渣率 %渣成分%42.0842.0845.1743.3353.33Zn7.297.2411.27.5422.14Pb5.055.385.334.854.05Fe6.86.117.286.816.99In0.00080.00080.00110.00480.0012Ag g/t渣计浸出率%268267260259271Zn93.4593.4989.2093.0274.79Pb11.826.050.1112.7910.37Fe62.4566.2656.8561.2751.08In97.2497.2495.9382.9594.75Ag5.525.581.325.69-21.46FeFeZnPbInAg90807060%率50出40浸30201000.20 0.25 0.30 0.35 0.40氧分压MPa图3 氧压对浸出的影响浓度增加能够增大锌的浸出速度，同时依据亨利定律可知，溶液中的氧浓度与氧的分压成正比。从结果可知氧压的浸出率高，氧压从0.2MPa增加到0.25MPa,锌浸出率从77.49%增加到93.02.再增加氧分压锌浸出率没有明显提高在0.25MPa以上对锌的浸出90%以上而氧压对铁的浸出影响较大氧分压从0.2MPa增加到0.4Mpa时，铁的浸出率从51.08%上升到62.45%。铟的浸出保持了较高的浸出率，除了在0.25Mpa 时，铟浸出率只有82.95%，其他氧压下铟的浸出率在之间。所以氧压选择在0.3MPa.4转速试验反响条件及装料：120g锌精矿，600ml液，酸度180g/l硫酸，酸锌比1.27 氧压0.3Mpa，粒度90%-38微米浸出时间4h，液固比5：1，Fe3+5g/l,温度100℃,表4 搅拌速度试验结果试验编号Zn1003-1Zn1004-1Zn0921-3转速r/min890-910790-810690-710后液体积〔ml〕930705850浸出渣〔g〕51.55154.2渣率 %渣成分%42.9242.5045.17Zn76.911.2Pb4.955.075.33Fe6.717.277.28InInAg渣计浸出率ZnPbFeInAgg/t%0.00062720.00092630.001126093.5811.8562.2197.891.9093.7410.5959.4596.866.0789.200.1156.8595.931.32ZnPbZnPbFeInAg8060%率出40浸200700 750 800 850 900搅拌转速r/min图四 搅拌对浸出的影响搅拌转速反映了矿浆搅拌强度，即气，液，固三相接触的状况。矿浆浓度44数据可以看出：800r/min900r/min时Zn,Fe,In元素的浸出率都相近，且锌的浸出率700r/min89.20%.所以800r/min。5时间试验180g/l890-910r/min,氧压0.3Mpa，液固比5：1，Fe3+5g/l,温度100℃,320目粒度90%-38微米表5 浸出时间试验结果试验编号Zn1004-2Zn1006-1Zn1003—1Zn1006-2Zn1006-3浸出时间h65432后液体积〔ml〕900880930710800浸出渣〔g〕49.149.551.554.557.5渣率 %渣成分%40.9241.2542.9245.4247.92Zn3.74.84710.2715.36Pb4.224.714.954.844.92Fe6.946.956.717.477.6In0.00060.00050.00060.00120.0009Ag g/t渣计浸出率%270275272249231Zn96.7795.7493.5890.0484.28Pb28.3519.3811.858.792.18Fe62.7362.3862.2155.4852.21In97.9998.3197.8995.5396.47Ag7.164.671.904.976.99FeFeZnPbInAg908070% 60率50出40浸30201002 3 4 5 6h图5 浸出时间对浸出的影响4小时后，增大幅度越来越小；铁的浸出率在4小时后的变化也很小；铟的浸出率较高；6小时的浸出过程中，4h,5h,6h93.58%,95.74%,96.77%62.21%,62.38%,62.73%；条件试验6 酸锌比试验反响条件及装料：600ml180g/l0.3Mpa，浸出时间5h，-38微米表6 酸锌比试验结果试验编号Zn1010-1Zn1010-2Zn1011-1Zn1006-1Zn1011-2酸锌比1.121.171.221.271.32参加精矿量g137131125120116后液体积〔ml〕590770750880590浸出渣〔g〕67625449.547.8渣率 %48.9147.3343.2041.2541.21渣成分%Zn10.0510.747.054.845.02Pb5.667.835.794.715.87Fe6.876.586.996.956.68In0.00100.00140.00060.00050.0003Ag g/t231229247275262渣计浸出率%Zn89.5089.1593.5095.7495.58Pb-14.86-53.77-3.7919.38-0.37Fe55.9159.1360.3762.3863.88In95.9994.5797.8898.3198.99Ag5.078.9210.334.679.28FeFeZnPbInAg8060%率出40浸2001.10 1.15 1.20 1.25 1.30 1.35酸锌比图6 酸锌比对浸出的影响从图6和表6时铁也随着浸出。硫酸用量高，加压浸出后溶液的游离酸浓度高，难以使浸出液中铁离子沉淀，这对溶液净化格外不利，溶液需要锌焙砂或氧化锌粉进展中和。因此，在满足锌浸出的前提下尽量降低终酸浓度，以抑制铁的浸出。本试验1.121.2789.50%95.74%；铁的浸出率55.9162.3894.571.27条件试验7 铁离子试验反响条件及装料：120g锌精矿，600ml液 氧压0.3Mpa, 搅拌转速790-810r/min,浸出时间5h，液固比5：1，Fe3+5g/l,100℃,过320目粒度90%-38微米 酸锌比1.27表7 铁离子试验结果试验编号Zn1013-2Zn1013-1Zn1014-1Zn1006-1Fe3+ g/l0135后液体积〔ml〕720610720880浸出渣〔g〕52515349.5渣率 %渣成分%43.3342.5044.1741.25Zn4.873.985.214.84Pb6.8710.877.124.71Fe5.833.615.946.95In0.00050.00020.00090.0005Ag g/t渣计浸出率%209284262275Zn95.4996.3995.0995.74Pb-23.53-91.69-30.4819.38Fe66.8579.8765.5762.38In98.2299.3096.7498.31Ag23.89-1.432.764.67FeFeZnPbInAg8060%率出40浸2000 1 2 3 4 5参加的三价铁离子g/l图7 铁离子对浸出的影响明锌精矿中有足够的铁来完成传递氧的作用。综合试验：综合以上条件，选择以下条件优化：锌精矿，600ml180g/l硫1.27氧压0.3Mpa, 搅拌转速790-810r/min, 液固比5：1，Fe3+0g/l,试验编号 1#Zn1019-1 2#Zn1019-2 3#Zn1020-1 4#Zn1020-2粒度过试验编号 1#Zn1019-1 2#Zn1019-2 3#Zn1020-1 4#Zn1020-2粒度过320目% 95 92.2 95 95.6浸出渣 g 50.5 51.5 53.5 51渣率 % 42.08 42.92 44.58 42.50渣成分%渣计浸出率%Zn4.285.213.945.89Pb4.263.923.965.55Fe8.934.754.977.01In0.00380.00340.00120.0005Agg/t308265302245S64.4463.4569.7466.81Zn96．2095.4696.3094.65Pb8.0615.881.36921.11Fe62.9470.7572.2059.02In85.4693.3797.8697.83Ag5.391.10-10.3613.23后液体积ml660660650600液成分 %Zn134.35130.50131.96138.88Pb0.010.010.020.02Fe12.329.7312.3810.10In0.0160.0420.0330.018Ag0.00020.00040.00030.0004H+ g/l0.310.200.260.24液计浸出率%Zn103.1394.9798.0395.73Pb0.310.2750.480.33Fe66.8276.7884.1469.46In80105.171.591.84Ag0.8031.9131.3321.667FeZnFeZnPbInAg8060%率出40浸2001# 2# 3# 4#四种锌精矿在同一条件下的浸出率图8 不同锌精矿浸出率8894.65%。四种锌精矿铅，铟，铁的浸出率各不一样，相差较大。.除铁试验除铁试验1 针铁矿法115PH0.5-150℃，1h，PH3.5-4,用石灰和。时，连续取样，PH3.5-4,通空气表9 针铁矿法沉铁试验结果液成分%ZnPbFeInAgml综合液131.570.01411.610.0260.0000221000复原后液123.570.0149.760.02190.000091100h119.46104．2800.00350．00119.56500．972<0.0005<0.000530.000125490056Fe3+ g/l9.5658.546.044.381.871.590.97除铁率%010．7236．8554．2180．4583．3889．41除铁试验2 铁矾法氧化条件：温度95℃，时间1小时，MnO2

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