Comprehensive Utilization Technology of Laterite Nickel Ore Residue
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摘要:
这是一篇陶瓷及复合材料领域的论文。为有效处理并资源化利用湿法冶炼产生的红土镍矿废渣，本研究利用广西某公司红土镍矿废渣为原料，通过测定水泥固化形成的胶结材料浸出液pH值和金属浸出浓度、无侧限抗压强度、干收缩率、弹性模量、渗透系数等指标，分析其作为建设用地回填材料或公路建设工程材料的可行性。结果表明：利用废渣（干基）92%、PO 42.5水泥5%、膨润土3%、外加PAC0.5%的比例加入适量水制成的废渣胶结材料，其浸出液的pH值为8.45左右，浸出金属离子浓度均低于0.1 mg/L，无侧限抗压强度1.47 MPa，弹性模量为1196 MPa，渗透系数为8.77×10-7 cm/s，抗干缩性能良好，可作为建设用地回填材料或公路建设工程材料；而利用原土（干基）92%、PO 42.5水泥5%、膨润土3%、外加CHF0.02%、水适量（约5%～8%）制成的原土胶结材料其抗干缩性能更好，可用作大体积胶结材料的表层，抵御长期接触干燥空气产生的干收缩裂缝，保护下层的废渣胶结材料，保证胶结材料整体稳定性。以上研究为红土镍矿废渣综合利用提供了一条新的途径，为废渣作回填材料或公路建材研究和工程实践奠定理论基础。
Abstract:This is an article in the field of ceramics and composites. In order to effectively treat and resource utilize lateritic nickel slag, this study used lateritic nickel slags as raw materials and measured the pH value of leaching solution, metal leaching concentration, material unconfined compressive strength, dry shrinkage, elastic modulus, permeability coefficient and other indexes of the cementing material formed by cement solidification, and analyzed the feasibility of using it as backfill material for construction land or highway construction engineering materials. The results show that the cementitious material is made of waste slag (dry basis) 92%, PO42.5 cement 5%, bentonite 3%, PAC 0.5% and water, the pH value of leaching solution is about 8.45, the concentration of leaching metal ions is less than 0.1 mg/L, the unconfined compressive strength is 1.47 MPa, the modulus of elasticity is 1196 MPa, the permeability coefficient is 8.77×10-7 cm/s, and the dry shrinkage resistance is good. It can be used as backfill material for construction land or highway construction engineering. The raw soil cementitious material made of 92% raw soil (dry basis), 5% PO42.5 cement, 3% bentonite, 0.02% additional CHF and 5%～8% water has better dry shrinkage resistance. It can be used as the surface layer of large volume cementitious material to resist dry shrinkage cracks caused by long-term contact with dry air, protect the waste slag cementitious material in the lower layer and ensure the overall stability of cementitious materials. The above research provides a new way for the comprehensive utilization of laterite nickel slags, and lays a theoretical foundation for the research and engineering practice of waste slag as backfill materials or highway building materials.
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Key words:
- Ceramics and composites /
- Laterite nickel ore /
- Waste residue /
- Cement /
- Composite cementing material
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表 1 废渣主要成分/%
Table 1. Main components of waste residues
烧失量 SiO2 Al2O3 Fe203 CaO MgO K2O Na2O SO3 18.86 39.1 2.52 22 2.52 3.6 0.06 0.68 10.09 
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