一步吸附法纯化制取食品级氯化钾实验研究

doi:10.19964/j.issn.1006-4990.2021-0741

Abstract

Abstract:

The industrial potassium chloride produced by Qinghai Salt Lake has flotation agent residues and heavy metals exceeding the standard.Purification of industrial potassium chloride for use as food grade potassium chloride will yield significant economic benefits.Fish scale activated carbon was prepared by activation method using waste fish scale as raw material.Using fish scale activated carbon as adsorbent，food grade potassium chloride could be obtained by simultaneously removing heavy metal lead ions[Pb（Ⅱ）] and organic amines from industrial potassium chloride insalt lake by one?step adsorption method.The results showed that fish scales were firstly pretreated by boiling and phosphoric acid impregnation，and then calcined at 550 ℃ to obtain fish scale activated carbon with a specific surface area of 496.152 m²/g.In the purification of industrial potassium chloride from fish?scale activated carbon，ion?exchange adsorption dominated its adsorption of Pb（Ⅱ），while electrostatic interactions and van der Waals interactions played an important role in its adsorption of octadecylamine.When the dosage of fish scale activated carbon was≥7 g/L，the contents of heavy metal Pb（Ⅱ） and organic amines in purified industrial potassium chloride were in accordance with the requirements of GB 25585—2010“Food Additives Potassium Chloride”.The one?step adsorption method of activated biochar was realized to prepare food grade potassium chloride from industrial potassium chloride in salt lake.

Key words: potassium chloride, salt lake, adsorption, activated carbon

CLC Number:

TQ131.13

DU Bingxuan,LI Haichao,LIN Zezhong. Study on preparation of food?grade potassium chloride by one?step adsorption and purification[J]. Inorganic Chemicals Industry, 2022, 54(9): 96-101.

Figures/Tables 7

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Table 1

Table 2

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Table 3

References 30

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鱼鳞活性炭投加量/（g·L）	w（氯化钾）/%	杂质含量/（mg·kg^-1）
鱼鳞活性炭投加量/（g·L）	w（氯化钾）/%	钙	镁	铅	十八胺	砷
0	95.131	46.300	30.100	16.300	169.800	未检出
1	97.384	未检出	未检出	10.240	115.890	未检出
2	未检测	未检出	未检出	3.239	70.404	未检出
3	98.760	未检出	未检出	1.254	37.276	未检出
4	未检测	未检出	未检出	0.941	17.058	未检出
5	99.139	未检出	未检出	0.766	13.694	未检出
7	99.259	未检出	未检出	未检出	未检出	未检出
9	99.339	未检出	未检出	未检出	未检出	未检出

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of food?grade potassium chloride by one?step adsorption and purification

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