沉钒废水除硅制备冶金级氢氧化铬研究

doi:10.11962/1006-4990.2019-0519

Abstract

Abstract:

Using lime powder as the desiliconizing agent,and the metallurgical grade chromium hydroxide was prepared from vanadium precipitation wastewater by lime powder+sodium hydroxide precipitation method.The results showed that the sili-con removal rate reached 67.9% under the conditions of first adjusting the pH at 7.5~8.0 with lime powder,then adjusting the pH above 9.5 with sodium hydroxide,the silicon removal temperature of 55~65 ℃ and the silicon removal time of 20~30 min. The prepared chromium hydroxide had a silicon content（calculated as SiO₂ mass fraction） of 4.2% and a low silicon content by removing silicon with lime powder.Low-silicon chromium hydroxide can be used as chromium metal smelting raw materials for welding flux and aluminum.

Key words: wastewater from vanadium precipitation, lime powder, silicon, chromium hydroxide

CLC Number:

TQ136.11

Teng Xiaohui,Sun Liyue,Zhuang Lijun. Study on preparation of metallurgical grade chromium hydroxide by removing silicon from vanadium wastewater[J]. Inorganic Chemicals Industry, 2020, 52(9): 88-90.

序号	除硅条件		除硅液pH和硅质量浓度		除硅率/ %
序号	石灰用量/ （g·L^-1）	过滤速度/ （min·L^-1）	pH	ρ（Si）/ （g·L^-1）	除硅率/ %
1	6.4	320	9.10	0.11	79.3
2	7.4	191	9.19	0.12	78.2
3	8.6	225	9.25	0.16	70.5
4	9.2	160	9.28	0.18	65.9
5	10.6	58	9.53	0.17	68.2
6	14.0	10	9.87	0.20	61.4
7	17.0	8	11.53	0.21	60.4

实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %	实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %
1	42.3	3.58	3	41.9	3.61
2	42.6	3.53	平均值	42.3	3.57

序号	除硅条件			除硅液pH和硅质量浓度		除硅率/%
序号	石灰用量/ （g·L^-1）	过滤速度/ （min·L^-1）	片碱用量/ （g·L^-1）	pH	ρ（Si）/ （g·L^-1）	除硅率/%
1	7.0	5	2.0	9.51	0.17	67.9
2	7.0	6	4.0	10.05	0.21	60.4
3	7.0	12	6.0	11.22	0.15	71.7

实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %	实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %
1	42.8	3.69	3	43.1	3.62
2	42.1	3.73	平均值	42.7	3.68

实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %	实验编号	w（Cr₂O₃）/ %	w（SiO₂）/ %
1	41.0	3.72	4	44.5	4.28
2	39.3	4.43	平均值	42.4	4.20
3	44.7	4.38

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of metallurgical grade chromium hydroxide by removing silicon from vanadium wastewater

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