Preparation and Properties of Heat-Collecting Coating from Vanadium Extraction Slag under Double Carbon Background
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摘要:
冶金矿产固废综合利用是构建绿色低碳循环经济体系的重要组成部分，本文以提钒弃渣为原料，经除铁、球磨、打浆、喷涂制备提钒弃渣太阳集热涂层，以水为介质，研究了不同倾角下的集热板的集热性能，结果表明在倾角为30°时，提钒弃渣涂层集热板的集热效率最好，可达到84.69%，同条件下仅比蓝钛膜涂层集热板集热效率低6.81%。
Abstract:The comprehensive utilization of metallurgical mineral solid waste is an important part of building a green and low-carbon circular economy system. In this paper, the vanadium-extracted and discarded slag is used as raw material, and the vanadium-extracted and discarded slag solar thermal collector coating is prepared by iron removal, ball milling, beating, and spraying. As the medium, the heat collection performance at different inclination angles was studied. The results show that when the inclination angle is 30°, the heat collection efficiency of the vanadium-extracted spoil coated heat collector plate is the best, which can reach 84.69%. The heat collection efficiency of the titanium film-coated collector plate is 6.81% lower. It shows that the vanadium-extracted waste slag used as a solar collector coating has a feasible technology, low price and important significance for solid waste reuse.
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表 1 提钒弃渣主要化学成分/%
Table 1. Main Chemical Components of vanadium extraction tailings
Fe2O3 TiO2 SiO2 MgO Al2O3 CaO MnO Cr2O3 Na2O V2O5 其他 41.84 12.90 14.40 3.57 3.20 2.50 7.84 2.24 8.12 2.08 1.31 
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表 2 提钒弃渣的粒度组成/%
Table 2. Particle size composition of vanadium extraction tailings
粒径范围/mm +0.154 -0.154+0.074 -0.074+0.038 -0.038+0.023 -0.023 比例/% 1.34 5.12 10.39 18.74 64.41
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表 3 除铁后的提钒弃渣主要化学成分/%
Table 3. Main chemical composition of vanadium extraction tailings after removing iron
Fe2O3 TiO2 SiO2 MgO Al2O3 CaO MnO Cr2O3 Na2O V2O5 其他 3.29 21.43 22.46 5.85 5.24 4.10 12.84 3.67 13.30 3.51 4.31
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表 4 提钒弃渣中氧化物的吸收率
Table 4. Absorption rate of oxide in vanadium extraction tailings
成分 Fe2O3 TiO2 V2O5 MnO SiO2 Al2O3 CaO MgO Cr2O3 Na2O 吸收率 0.88 0.83 0.85 0.90 0.89 0.86 0.87 0.92 0.82 0.87
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表 5 实验数据结果计算
Table 5. Calculation of experimental data results
集热板 水减少量/kg 水升温的热量W1/kJ 汽化的水的热量W2/kJ 集热器吸收的太阳辐射能Qn/W 集热器集热效率/% 蓝钛膜 0.86 42.75 2136.24 2178.99 84.46 0.3 g/mL提钒弃渣 0.59 125.19 1465.56 1590.75 61.66 0.35 g/mL提钒弃渣 0.69 94.66 1713.96 1808.62 70.11
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表 6 不同倾角下提钒弃渣涂层集热板的集热性能
Table 6. Heat collection performance of vanadium extraction slag discarding coating heat collector plate at different dip angles
倾角
度数蓝钛膜 0.3 g/mL
提钒弃渣0.35 g/mL
提钒弃渣辐照
强度0° 84.46 61.66 70.11 1289.9 w/m2 10° 85.95 63.35 72.58 1217.5 w/m2 20° 89.45 67.87 75.94 1257.4 w/m2 30° 91.50 73.68 84.69 1189.5 w/m2 40° 83.54 65.89 79.56 1276.8 w/m2
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