(1. 北京科技大學(xué) 金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083；
2. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083；
3. 金川集團(tuán)股份有限公司，金昌 737100)
摘 要: 為了尋求二次鎳渣的資源化利用，開展以二次鎳渣為原料制備微晶鑄石的研究。首先對(duì)試驗(yàn)原料進(jìn)行物化分析，并借助CaO-MgO-Al2O3-SiO2四元相圖，進(jìn)行配比優(yōu)化試驗(yàn)；然后對(duì)其熱處理制度進(jìn)行研究，確定了最佳的核化、晶化溫度及保溫時(shí)間，并測(cè)定其性能指標(biāo)；最后采用XRD、IR紅外光譜、DSC、SEM及EDS等對(duì)其結(jié)構(gòu)和微觀進(jìn)行分析，并結(jié)合力學(xué)性能測(cè)試研究熱處理制度對(duì)其性能的影響及其析晶機(jī)理。結(jié)果表明：采用配比為二次鎳渣89%、石英砂6%、氧化鋁4%、氧化鋯0.5%、氟化鈣0.5%，在均化溫度1500 ℃、保溫300 min條件下得到過冷卻熔態(tài)鎳渣，然后在核化溫度730 ℃和晶化溫度980 ℃時(shí)，分別保溫60 min進(jìn)行熱處理，冷卻后得到微晶鑄石，最后測(cè)得其抗壓和抗折強(qiáng)度分別為894.3 MPa和174.8 MPa，沖擊韌性為2.82 kJ/m2，耐磨性為0.025 g/cm2、耐酸堿度分別為99.5%和99.2%。
關(guān)鍵字: 二次鎳渣；微晶鑄石；熱處理制度；微觀測(cè)試；性能
（1. Key Laboratory of High Efficient Mining and Safety of Metal Mine of Ministry of Education, University of Scienceand Technology Beijing, Beijing 100083, China;
2. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. Jinchuan Group Co., Ltd., Jinchang 737100, China）
Abstract:In order to seek the resource utilization of secondary nickel slag, the preparation of cast stone with molten secondary nickel slag(MSNS) as the main raw material was carried out. Firstly, the material was analyzed by physicochemical method, and the optimum ratio test was carried out by using CaO-MgO-Al2O3-SiO2 phase diagram. Then, the heat treatment system was studied to determine the optimal nucleation and crystallization temperature and holding time, and the performance indexes were determined. Finally, XRD, IR, DSC, SEM and EDS were used to test and analyze the structure and microstructure. Combined with the mechanical properties test, the effect of heat treatment on the properties of microcrystalline cast stone and its crystallization mechanism were explored. The results show that, cast stone is prepared by mixing 89% molten secondary nickel slag, 6% quartz sand(QS), 4% alumina, 0.5% zirconia and 0.5% calcium fluoride. The supercooled molten nickel slag is obtained at the homogenization temperature of 1500 ℃ and holding for 300 min. Then, when the nucleation temperature is 730 ℃ and the crystallization temperature is 980 ℃, both holding time of them are 60 min. After cooling, the microcrystalline cast stone is obtained. Finally, its compressive and flexural strength are measured to be 894.3 MPa and 174.8 MPa, respectively, impact toughness(IT) is 2.82 kJ/m2, wear resistance(WR) is 0.025 g/cm2, acid and alkali resistance(AAR) are 99.5% and 99.2%, respectively.
Key words: secondary nickel slag; cast stone; heat treatment system; microscopic test; performance
