Method for cooperatively treating chromium-containing sludge and waste sulfuric acid and recycling chromium-containing sludge and waste sulfuric acid

By collaborating the treatment of chromium-containing sludge and waste sulfuric acid, and using acid-soluble, oxidation reaction and vacuum evaporation crystallization, the recycling and utilization of chromium salt resources has been successfully achieved, solving the problems of harmless and insufficient resource utilization of chromium-containing sludge in the prior art, and achieving efficient and low-cost treatment effects.

CN119954359APending Publication Date: 2025-05-09BAOWU GRP ENVIRONMENTAL RESOURCES TECH CO LTD
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Patent Information

Application Number
CN202510039944.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-10
Publication Date
2025-05-09

AI Technical Summary

Technical Problem

The prior art has insufficient harmless disposal and resource utilization when dealing with chromium-containing sludge, especially the failure to effectively utilize chromium salt resources, and high-temperature melting treatment has high energy consumption and difficulty in application of by-products.

Method used

By collaborating the treatment of chromium-containing sludge and waste sulfuric acid, high-purity sodium chromate crystals are separated by acid dissolution, oxidation reaction and vacuum evaporation crystallization, the recycling and utilization of chromium salt resources is realized.

Benefits of technology

The harmless and resource-based treatment of multi-source hazardous waste has been achieved, the treatment cost has been reduced, the treatment efficiency has been improved, and the chromium-containing sludge has been converted into high-value products, solving the problem of effective resource utilization.

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Abstract

The invention discloses a method for co-processing chromium-containing sludge and waste sulfuric acid and recycling the chromium-containing sludge and the waste sulfuric acid, which comprises the following steps: S1, sieving the chromium-containing sludge to remove impurities, mixing a strong acid solution formed by mixing the waste sulfuric acid and concentrated sulfuric acid with the chromium-containing sludge for acid dissolution, and filtering to obtain a trivalent chromium-containing solution; s2, NaOH is added into the solution containing trivalent chromium to adjust the pH value to be alkaline, then an oxidizing agent is added for an oxidation reaction, and a solution containing hexavalent chromium is obtained; s3, adding Na2CO3 into the hexavalent chromium-containing solution for neutralization, and filtering to obtain a sodium chromate-containing solution; and S4, carrying out vacuum evaporative crystallization on the solution containing sodium chromate to obtain sodium chromate crystals. According to the method, the chromium-containing sludge and the waste sulfuric acid are subjected to cooperative treatment, and the purposes of harmlessness and recycling of the multi-source hazardous waste are achieved.
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