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

A technology of high-sulfur petroleum and petroleum coke, which is applied in recycling technology, solid waste removal, electronic waste recycling, etc., can solve the problems of increased production cost, complicated treatment process, and increased production cost, so as to protect the environment and solve a large number of problems. Storing and heating uniform effect

Inactive Publication Date: 2009-11-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: 10g of chromium slag and 1.0g of high-sulfur petroleum coke are loaded into the reactor (ceramic crucible), and mixed evenly, then the reactor is put into a microwave oven, and the slag wool insulation material is used around the reactor to insulate, and a shielding is adopted. The armored thermocouple measures the temperature in the microwave field, raises the temperature to 700°C, turns off the microwave oven after 20 minutes of heat preservation, and opens the furnace door after 8 minutes. After the material is cooled, immerse the material in distilled water, filter after soaking for 24 hours, and set the filtrate to volume To 250ml, use diphenylcarbazide spectrophotometry to measure the Cr in the filtrate 6+ Concentration, calculated as Cr 6+ The detoxification rate is 99.024%.

Embodiment 2

[0037] Embodiment 2: 10g of chromium slag and 2.5g of high-sulfur petroleum coke are loaded into the reactor (ceramic crucible), and mix uniformly, then the reactor is put into a microwave oven, and the surroundings of the reactor are insulated with slag wool insulation materials, and a shielding The armored thermocouple measures the temperature in the microwave field, raises the temperature to 800°C, turns off the microwave oven after 25 minutes of heat preservation, and opens the oven door after 8 minutes. After the material is cooled, immerse the material in distilled water, filter after soaking for 24 hours, and make the filtrate to volume To 250ml, use diphenylcarbazide spectrophotometry to measure the Cr in the filtrate 6+ Concentration, calculated as Cr 6+ The detoxification rate is 99.135%.

Embodiment 3

[0038] Embodiment 3: 10g of chromium slag and 5.0g of high-sulfur petroleum coke are loaded into the reactor (ceramic crucible), and mix uniformly, then the reactor is put into a microwave oven, and the surroundings of the reactor are insulated with slag wool insulation materials, and a shielding The armored thermocouple measures the temperature in the microwave field, raises the temperature to 900°C, turns off the microwave oven after 30 minutes of heat preservation, and opens the furnace door after 8 minutes. After the material is cooled, immerse the material in distilled water, filter after soaking for 24 hours, and constant the filtrate To 250ml, use diphenylcarbazide spectrophotometry to measure the Cr in the filtrate 6+ Concentration, calculated as Cr 6+ The detoxification rate is 99.373%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/178A62D3/37B09B3/00A62D101/43
CPCY02W30/82
Inventor 杨月红任治忠欧根能宁平赵健蓉张慧娜方祖国
Owner KUNMING UNIV OF SCI & TECH
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