REVIEW ON EXTRACTION OF POTASSIUM FROM METALLURGICAL DUST-CONTAINING POTASSIUM
The solid waste,such as sintering machine head ash generated by steel enterprises has a high potassium content.If it is directly returned as ironmaking raw materials for sintering and recycling without treatment,it will not only affect the quality of sintered ore,but also lead to problems such as an increase in coke ratio and obstruction in the blast furnace ironmaking process.At the same time,China's potassium ore reserves are insufficient,and the external dependence of potash is higher than 1/2.Given the above problems,this paper first introduces the treatment of iron and steel dust and the production and consumption status of potassium salt,and deeply analyzes the impact of potassium dust removal as sintering raw material on the ironmaking process.After that,the dust removal process of the rotary kiln and rotary hearth furnace is introduced,which also leads to the enrichment of potassium in the secondary zinc dust.Finally,based on the physical and chemical properties and the existing state of potassium-containing substances in the dust,the research progress of potassium extraction from the potassium-containing dust by two processes of"flotation gravity separation"and"water leaching-separation-purification-crystallization"is introduced.If the potassium-containing dust from the sintering process and the secondary zinc dust from the rotary hearth furnace are all recycled for KCl,it is expected to reduce the external dependence proportion of KCl in China by about 20％.
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