The simultaneous synthesis of high-quality forsterite and sintered magnesia from magnesite flotation tailings

doi:10.11949/0438-1157.20220143

Abstract

Abstract:

This paper proposed producing high-quality forsterite and sintered magnesia by high-temperature solid-state reactions of the waste magnesia ore directly without adding other materials and briquetting in order to realize the value-added utilization of magnesite flotation tailings. The experiments were carried out in a high-temperature tubular reactor at different reaction temperatures and times. The reaction products were characterized by XRD and SEM-EDS. The results confirmed that the proposed method was technically feasible and had noticeable advantages, including the fast reaction rate and high product quality. When the reaction temperature is 1400℃ and above, the SiO₂ in the raw material is completely converted within a few minutes, and the product forsterite and sintered magnesia crystals are well developed. The research results provide strong support for the further development of new technologies of efficient utilization of magnesite flotation tailings.

Key words: magnesite flotation tailings, forsterite, sintered magnesia, fine particle, high-temperature solid-state reactions

摘要：

为了有效利用菱镁矿浮选尾矿废弃物，提出以其为原料，在不添加任何物质、不经过高压压制成型的条件下直接烧制同时制备优质镁橄榄石和烧结镁砂的技术路线，并在高温管式炉中对其可行性进行了实验研究。通过对不同反应温度和时间条件下制备的样品进行XRD和SEM-EDS表征和分析，确认新技术路线不仅可行，并且还具有反应速度快、产品质量优等优势。当反应温度为1400℃及以上时，原料中的SiO₂在数分钟之内全部转化，产物镁橄榄石和烧结镁砂晶体发育良好。研究结果对进一步开发菱镁矿浮选尾矿废弃物高效利用新技术提供有力支持。

关键词: 菱镁矿浮选尾矿, 镁橄榄石, 烧结镁砂, 细颗粒, 高温固相反应

CLC Number:

TQ 028.8

Yafu LI, Liangliang FU, Haolong BAI, Dingrong BAI, Guangwen XU. The simultaneous synthesis of high-quality forsterite and sintered magnesia from magnesite flotation tailings[J]. CIESC Journal, 2022, 73(8): 3679-3687.

李亚芾, 付亮亮, 白浩隆, 白丁荣, 许光文. 菱镁矿浮选尾矿直接合成同时制备镁橄榄石和镁砂研究[J]. 化工学报, 2022, 73(8): 3679-3687.

Figures/Tables 14

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研究者	原料	试样样品形状或尺寸	反应温度和时间	主要结果
陈勇等^[13]	电熔镁砂细粉和二氧化硅微粉	Φ 40 mm×25 mm	1350/1400/1450/1500/1550/1600℃, 5 h	在最佳MgO和SiO₂配比下，仍有少量 SiO₂未完全转化；过量MgO阻碍了烧结的进行
Ando等^[14]	高纯硅粉和电熔镁砂	Φ 12 mm×6 mm	1400℃，2 h	未完全转化的SiO₂影响了产物作为超高频电介质的性能
丁达飞等^[15]	菱镁矿尾矿、硅石粉、硅灰、滑石及高纯镁砂	Φ 40 mm×130 mm	1580℃, 5 h	理论配比条件下仍有3%~10%的MgO未转化成镁橄榄石
陈少一等^[16]	氢氧化镁和二氧化硅	Φ 40 mm×50 mm	1400/1500/1600/1700℃, 3 h	1500℃及以下超过30%的SiO₂未转化成镁橄榄石
孟庆新等^[17]	菱镁矿细粉和天然硅石粉	圆柱试样（文中未提及具体尺寸）	1300/1400/1500/1600℃, 3 h	温度低于1400℃时，物相组成中含有未转化的SiO₂
Ren等^[18]	菱镁矿尾矿与硅废料	Φ 50×50 mm	1300/1400/1500/1600℃, 3 h	硅石对反应过程和产品质量具有较大影响
Liu等^[19]	SiO₂和Mg(OH)₂材料	Φ 50×50 mm Φ 25×50 mm	1500℃，3 h后，再1500/1600/1700℃, 3 h	在第一段烧结过程中，会生成顽火辉石相，并非全部转化成为镁橄榄石
Kullatham等^[20]	泰国滑石和菱镁矿	Φ 15 mm×20 mm	900/1000/1100/1200/1300℃，1 h	24 h球磨和5 h活化原料，烧结产物相对密度最高84.59%
Tan等^[2]	MgO粉末和 Mg₃Si₄O₁₀(OH)₂粉末	圆形球坯（文中未提及具体尺寸）	1200~1500℃，2 h	在1200℃反应2 h，再在1200~1500℃烧结2 h后，才生成产品

研究者	原料	试样样品形状或尺寸	反应温度和时间	主要结果
陈勇等^[13]	电熔镁砂细粉和二氧化硅微粉	Φ 40 mm×25 mm	1350/1400/1450/1500/1550/1600℃, 5 h	在最佳MgO和SiO₂配比下，仍有少量 SiO₂未完全转化；过量MgO阻碍了烧结的进行
Ando等^[14]	高纯硅粉和电熔镁砂	Φ 12 mm×6 mm	1400℃，2 h	未完全转化的SiO₂影响了产物作为超高频电介质的性能
丁达飞等^[15]	菱镁矿尾矿、硅石粉、硅灰、滑石及高纯镁砂	Φ 40 mm×130 mm	1580℃, 5 h	理论配比条件下仍有3%~10%的MgO未转化成镁橄榄石
陈少一等^[16]	氢氧化镁和二氧化硅	Φ 40 mm×50 mm	1400/1500/1600/1700℃, 3 h	1500℃及以下超过30%的SiO₂未转化成镁橄榄石
孟庆新等^[17]	菱镁矿细粉和天然硅石粉	圆柱试样（文中未提及具体尺寸）	1300/1400/1500/1600℃, 3 h	温度低于1400℃时，物相组成中含有未转化的SiO₂
Ren等^[18]	菱镁矿尾矿与硅废料	Φ 50×50 mm	1300/1400/1500/1600℃, 3 h	硅石对反应过程和产品质量具有较大影响
Liu等^[19]	SiO₂和Mg(OH)₂材料	Φ 50×50 mm Φ 25×50 mm	1500℃，3 h后，再1500/1600/1700℃, 3 h	在第一段烧结过程中，会生成顽火辉石相，并非全部转化成为镁橄榄石
Kullatham等^[20]	泰国滑石和菱镁矿	Φ 15 mm×20 mm	900/1000/1100/1200/1300℃，1 h	24 h球磨和5 h活化原料，烧结产物相对密度最高84.59%
Tan等^[2]	MgO粉末和 Mg₃Si₄O₁₀(OH)₂粉末	圆形球坯（文中未提及具体尺寸）	1200~1500℃，2 h	在1200℃反应2 h，再在1200~1500℃烧结2 h后，才生成产品

项目		MgCO₃	MgO	SiO₂	Al₂O₃	Fe₂O₃	CaO
原料A	%(mol)	68.12	—	29.63	1.19	0.46	0.60
原料A	%(mass)	74.09	—	22.96	1.56	0.96	0.43
原料B	%(mol)	—	74.34	23.01	1.29	0.25	1.11
原料B	%(mass)	—	64.96	29.97	2.86	0.86	1.35

项目		MgCO₃	MgO	SiO₂	Al₂O₃	Fe₂O₃	CaO
原料A	%(mol)	68.12	—	29.63	1.19	0.46	0.60
原料A	%(mass)	74.09	—	22.96	1.56	0.96	0.43
原料B	%(mol)	—	74.34	23.01	1.29	0.25	1.11
原料B	%(mass)	—	64.96	29.97	2.86	0.86	1.35

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