Stabilizer for treating arsenic-containing waste residues, and preparation method thereof

Abstract

The invention discloses a stabilizer for treating arsenic-containing waste residues, and a preparation method thereof. The stabilizer comprises 40-60 wt% of micro-silica powder, 10-20 wt% of iron-loaded biochar, 5-15 wt% of cement, 10-15 wt% of a pH regulator and 10-15 wt% of a heavy metal complexing agent. The preparation method comprises the following steps: adding the pH regulator to ground micro-silica powder according to above weight proportions, adding deionized water, and performing stirring and uniform mixing at room temperature to obtain modified micro-silica powder; and sequentiallyadding the iron-loaded biochar, cement and the heavy metal complexing agent to the modified micro-silica powder according to above weight proportions, adding the obtained mixture into a reactor, reacting the mixture to obtain a reaction product, and drying the reaction product to obtain the stabilizer. The stabilizer solves the problems of single component, high cost and easiness in being affectedby the arsenic-contaminated waste residue environment of traditional stabilizers, and the preparation method has the advantages of simplicity, no pollution to the environment, and suitableness for industrial production.

Description

technical field [0001] The invention relates to a stabilizer for treating arsenic-containing waste residue and a preparation method thereof, belonging to the technical field of heavy metal arsenic pollution control and environmental restoration. Background technique [0002] Arsenic has a great impact on human health, and is internationally recognized as a highly toxic and highly variable element. The World Health Organization lists it as the element with the greatest impact on the environment. Arsenic-containing waste residues mainly refer to arsenic-containing tailings in the smelting process, arsenic-containing wastes from the treatment of arsenic-containing wastewater and solid waste from the electronics industry, etc., which have the characteristics of high arsenic content, difficult treatment, and high pollution. The disorderly stacking of arsenic-containing waste residues, the leachate produced after precipitation and surface water leaching will cause serious heavy me...

AI Technical Summary

Problems solved by technology

[0004] Stabilizers are divided into three categories: inorganic type, organic type and biomass type. In production, inorganic type stabilizers are the most widely used. Inorganic type stabilizers include calcium-containing substances, iron-containing substances, sulfur-containing substances, phosphoric acid Salt and polyphosphate, etc., but most of the stabilizers are single or a combination of single types. Lu Qiaoli et al. used ferric salt as the arsenic slag stabilizer, and controlled the pH to 6.5-7.5, which can make the leaching of arsenic slag The concentration meets the requirements of a safe landfill site. Although this type of stabilizer has a better effect, the dosage is large, resulting in high cost of the agent, and this type of stabilizer is easily degraded in the soil, causing heavy metals to be released again, causing secondary pollution.

Images