从工业硅渣中回收硅和铝的研究

doi:10.19964/j.issn.1006-4990.2022-0664

Abstract

Abstract:

The industrial silicon slag is mainly composed of silicon，aluminum，calcium ternary oxides and a small amount of silicon.The content of other impurities is extremely rare.It can be used as the raw material for high-quality molecular sieve.Sodium silicate and sodium aluminate solution were extracted from industrial silicon slag by "baking soda alkali leaching" process.The effects of calcination time，calcination temperature and sodium carbonate addition on the leach rate of silicon and aluminum were investigated.The results showed that under the optimum conditions of calcination temperature of 800 ℃，calcination time of 30 min and 1.1 times of the theoretical amount of sodium carbonate，the conversion rate of silicon and aluminum was high，and the leach rates of silicon and aluminum in alkali leaching were 82.34% and 67.10% respectively.The process was feasible，which solved the problem of industrial silicon waste residue stockpiling and brings considerable economic benefits.

Key words: industrial silicon slag, sodium silicate, sodium aluminate, soda roasted, leaching

CLC Number:

TQ127.2

LUO Wenbo, LI Heng, LÜ Jun, YANG Linguang, ZHAO Xingfan, LONG Xiao. Study on recovery of silicon and aluminum from industrial silicon slag[J]. Inorganic Chemicals Industry, 2023, 55(9): 94-99.

Figures/Tables 14

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编号	浸出率/%
编号	Si	Al
1	82.85	67.32
2	82.25	67.56
3	81.92	66.43
均值	82.34	67.10

序号	组分质量分数/%
序号	C	O	Na	Al	Si	Ca	Mg	Fe
1	37.95	18.51	6.14	1.63	14.15	21.62	—	—
2	5.35	39.67	14.42	2.09	17.31	20.20	0.29	0.68
3	2.41	36.64	17.31	6.36	21.64	15.63	—	—

序号	原子数分数/%
序号	C	O	Na	Al	Si	Ca	Mg	Fe
1	55.56	20.34	4.69	1.06	8.86	9.49	—	—
2	9.33	51.94	13.14	1.62	12.91	10.56	0.25	0.25
3	4.33	49.35	16.23	5.08	16.61	8.41	—	—

项目	名称	单价/ （元·t^-1）	数量/ t	价格/ 万元	总计/ 万元
投入	工业硅渣	30	10 000	30	2 523.6
	碳酸钠	2 600	4 500	1 170
	氢氧化钠	4 600	2 400	1 104
	水	3.6	60 000	21.6
	能源（煤炭）	600	3 300	198
产出	五水偏硅酸钠	2 200	23 580	5 187.6	5 744.1
产出	偏铝酸钠	3 500	1 590	556.5	5 744.1

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Study on recovery of silicon and aluminum from industrial silicon slag

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