Method for detoxicating chromium residue by utilizing high sulfur petroleum coke through microwave

Abstract

The invention discloses a method for detoxicating chromium residue by utilizing high sulfur petroleum coke through microwave, which mainly uses C in the high sulfur petroleum coke to have redox reaction together with the chromium residue; Cr compound in the chromium residue is deacidized into Cr compound in medium under the high temperature condition; as the Cr with higher toxicity is deacidized into the Cr with lower toxicity, the aim of decontaminating the chromium residue can be achieved, effect for decontaminating the Cr reaches more than 99%, and the detoxicated residue can be taken as mineralizing agent for the cement production, coloring agent in glass and ceramic industry as well as aggregate in highway construction. The method comprises the steps: a ceramic crucible of a reactor is added with the chromium residue and the high sulfur petroleum coke according to the proportion; the mixture is evenly mixed; then, the crucible is placed into a microwave oven and is surrounded with silicate cotton heat insulating material for heat preservation; a shielded armored thermocouple is adopted for measuring the temperature in the microwave field; when the temperature raises to 700-1000 DEG C, heat preservation is carried out for 20-35min, the microwave oven is closed for 8min, and then a door of the microwave oven is opened; after being cooled, the material is dipped into distilled water for 24h and then filtered; finally, the filtrate has the constant volume of 250ml.

Description

technical field [0001] The invention relates to a method for detoxifying chromium slag by using microwave heating to cause redox reaction between high-sulfur petroleum coke and chromium slag, and belongs to the fields of environmental protection and "three wastes" treatment. Background technique [0002] Chromium slag is the toxic waste slag discharged during the production process of chromium salt industry. In the production process of metal chromium or chromium salt, the mixture of finely ground chromite, dolomite and soda ash is added to the rotary kiln for oxidation and roasting, so that most of the chromium trioxide in the chromite ore is converted into chromic acid. Sodium, the remaining solid waste residue is chromium residue. Chromium waste residue contains leached Cr 6+ , Cr 6+ It is a strong oxidant. Its toxicity and potential hazards are mainly carcinogenic and gene mutation-inducing, as well as stimulating and sensitizing effects on the skin, toxic to the huma...

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Problems solved by technology

[0009] (1) The treatment process is complicated, the reaction time is long, and the operation difficulty is increased, resulting in an increase in production cost;

[0010] (2) The required temperature is high and the reaction time is long in the part of the invention process, and there is also the problem of secondary wastewater treatment, which greatly increases the production cost

[0011] (3) Chemical reagents need to be used in the production process, and the production cost increases

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