反应条件及陈化过程对氢氧化铬氧化速率的影响

doi:10.19964/j.issn.1006-4990.2020-0695

Abstract

Abstract:

Chromium hydroxide is an important form of chromium in secondary resources containing chromium,and is also the main product in the reduction of pollutants containing hexavalent chromium.It is of great significance to study the oxida-tion process to extract chromium resources and control chromium pollution.Chromium hydroxide samples were prepared by reduction of sodium dichromate using sodium sulfite.The effect of oxidation temperature（room temperature~200 ℃）,oxida-tion time（0~168 h） and additives（Na₂CO₃、Na₂SO₄） on the oxidation process of chromium hydroxide samples was investigated experimentally.An oxidation equation was selected and the kinetic fitting calculation was carried out.The results showed that the higher temperature,the more sufficient of the oxidation reaction of the two chromium hydroxide samples and the greater the oxidation rate.Under the condition of no additives,the oxidation rate K value of newly prepared and aged chromium hydro-xide at 200 ℃ was 617 and 4 375 times of that at 80 ℃,respectively.The addition of additives would promote its oxidation reac-tion.At 140 ℃,when Na₂CO₃ and Na₂SO₄（Na∶Cr molar ratio was 0.2） were added to the newly prepared chromium hydroxide,the oxidation rate K value was 10 and 4 times of that without addition,respectively.The oxidation rate K value was 1.4~1.9 times of that of the aged chromium hydroxide sample,which may be related to have more bound water.

Key words: chromium hydroxide, aged, bound water, oxidation reaction, reaction kinetics

CLC Number:

TQ136.11

Jiao Shuai,Yi Shouzhi,Zhang Hongling,Chen Huixia,Cheng Xichuan,Zhang Lichang,Xu Hongbin. Effect of reaction condition and aging process on the oxidation rate of chromium hydroxide[J]. Inorganic Chemicals Industry, 2021, 53(10): 59-63.

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样品	w（Na⁺）/%	w（Cr⁶⁺）/（mg·g^-1）
新制氢氧化铬	0.07	未检出
陈化氢氧化铬	0.15	未检出

T/℃	添加剂	R²（a）	K（a）	R²（b）	K（b）
	Na₂CO₃	0.969 9	6.62×10^-4	0.989 7	4.65×10^-4
80	Na₂SO₄	0.967 8	6.10×10^-5	0.973 3	2.75×10^-5
	无添加	0.989 9	4.70×10^-5	0.977 8	4.80×10^-6
	Na₂CO₃	0.986 8	0.003 9	0.957 8	0.002 7
140	Na₂SO₄	0.962 5	0.001 5	0.985 3	8.05×10^-4
	无添加	0.951 6	0.000 4	0.959 9	3.23×10^-4
	Na₂CO₃	0.993 5	0.057	0.992 1	0.030
200	Na₂SO₄	0.993 3	0.038	0.989 9	0.026
	无添加	0.995 4	0.029	0.994 2	0.021

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of reaction condition and aging process on the oxidation rate of chromium hydroxide

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