Comprehensive recovery method of waste rare earth polishing powder and iron and steel acid washing waste liquid

Abstract

The invention relates to a comprehensive recovery method for waste rare earth polishing powder and iron and steel acid washing waste liquid. The method comprises the following steps: 1) adding waste rare earth polishing powder and iron and steel acid washing waste liquid into a high-pressure reaction kettle, and carrying out a reaction for 1-5 h; 2) discharging the material liquid in the high-pressure reaction kettle, conveying into a magnetic separator, carrying out magnetic separation, washing magnetic separation concentrate, drying to obtain an alpha-Fe2O3 product, and filtering, washing and filtering the magnetic separation tailings to obtain filtrate and filter residues for later use; 3) evaporating and crystallizing the filtrate in the step 2) to obtain a cerium chloride or cerium sulfate product; and 4) washing the filter residues in the step 2), carrying out ball milling, and drying to obtain a white carbon black product. According to the invention, the waste rare earth polishing powder and the iron and steel acid washing waste liquid are simultaneously utilized, so that the defect of high cost caused by independent recycling of the two wastes is overcome, high-quality alpha-Fe2O3 powder, white carbon black and cerium chloride crystals or cerium sulfate crystals are produced, the whole production process is few, no waste liquid is discharged, no new waste residues are generated, valuable elements are fully utilized, and the method has good economic benefits.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a comprehensive recovery method for waste rare earth polishing powder and steel pickling waste liquid. Background technique [0002] The pickling waste liquid in the iron and steel industry has always been one of the main liquid pollutants in the iron and steel industry. Iron red, but the iron oxide red product produced is of low grade and large particles, and is mainly used to prepare soft ferrite ferrite. However, the market demand for soft ferrite ferrite is small and the output is low. Therefore, iron oxide prepared from iron and steel pickling waste liquid The supply of red products exceeds demand, and the economic benefits cannot be brought into full play. However, when iron oxide red is used in other industries, there are problems such as poor product quality and high cost. Waste liquid cannot be recycled. In addition, there are two types of steel pickling ...

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Problems solved by technology

[0004] Iron and steel pickling waste liquid and waste rare earth polishing powder are hazardous wastes. At present, most of them are recycled separately, and most of them have not formed industrialized production. As a result, a large amount of steel pickling waste liquid and waste rare earth polishing powder in actual production cannot be properly treated Therefore, through long-term research, the applicant aims to develop a comprehensive recovery method for waste rare earth polishing powder and steel pickling waste liquid, so as to better meet the actual production needs

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