A kind of method for solidifying chromium in polluted acid residue

Abstract

The invention relates to a method for solidifying chromium in polluted acid slag. Its characteristic is that it includes the following steps: first, add modified metal magnesium slag to the dirty acid slag after drying and grinding, mix it evenly, and press it into a block, and then put the obtained block into a sintering furnace at 800-1300°C Keep it warm for 4‑8 hours, cool down, take it out and dry grind it into powder. The method of the present invention has the following advantages: the present invention is an environmentally friendly treatment method for solidifying and stabilizing the heavy metal Cr in the polluted acid slag. The modified reducing slag smelted with metal magnesium is sintered to realize the solidification and stabilization of the heavy metal in the polluted acid slag. The purpose of treating waste. Therefore, the solidification and stabilization process does not need expensive materials, and the cost of raw materials is low; the modified magnesium slag is fully utilized; the solidification process of the polluted acid slag is simple and easy to implement, so it can realize industrial operation; no secondary waste residue is produced in the process of solidifying and stabilizing heavy metals , Waste water.

Description

technical field [0001] The invention relates to a method for solidifying chromium in polluted acid slag. Background technique [0002] Non-ferrous metal smelting is a heavily polluting industry that plays a pivotal role in my country's economic development. However, the long-term accumulation of waste residues in the non-ferrous metal smelting industry has led to serious pollution of groundwater, posing major safety hazards, and severely restricting the sustainable development of the non-ferrous metal industry. Two types of society" construction. [0003] The lead and zinc industry is an important representative of non-ferrous metal smelting in my country. The bulk industrial solid waste in my country's lead and zinc industry mainly comes from metallurgical slag and acidic water treatment slag (polluted acid slag), and the annual industrial waste slag is estimated to exceed 6 million tons. Taking Qingshuitang Industrial Zone in Zhuzhou as an example, millions of tons of var...

AI Technical Summary

Problems solved by technology

If the heavy metal elements in the heavy metal polluted acid waste residue cannot be stably stored in the polluted acid residue, it will easily flow to the environment and cause serious harm to the human body and the surrounding environment; in terms of harm to the human body, on the one hand, direct drinking will cause heavy metal poisoning and damage human health. On the other hand, it indirectly pollutes agricultural and aquatic products, which poses a threat to human health through the food chain

The chromium element in the environment, especially the hexavalent chromium ion, is a pollutant with strong toxic effects on human health, and there are major safety hazards. It is urgent to develop and use industrialized technology for harmless treatment and reduction.

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