Deep thallium removal trapping agent for smelting wastewater and preparation method of deep thallium removal trapping agent

Abstract

The invention provides a preparation method of a deep thallium removal trapping agent for smelting wastewater, and relates to the technical field of smelting wastewater treatment. According to the invention, palm leaves are used as a main raw material, the palm leaves are pretreated to prepare palm leaf activated carbon, H2S is introduced to carry out plasma treatment, and the palm leaf activated carbon, the stabilizer, the complexing agent, the flocculant and the like are used for preparing the agent A and the agent B of the deep thallium removal trapping agent, so that various heavy metals are separated, precipitated and removed, and the recovery treatment difficulty of solid wastes is reduced; secondary pollution of solid waste to the environment is reduced, and the method is suitable for treatment and recovery of various smelting wastewater associated with the thallium element. The method is low in cost, simple and convenient to operate, easy to recycle and treat solid waste, high in capacity of trapping heavy metal ions such as thallium ions and the like, and capable of being widely applied to treatment of various mineral smelting wastewater associated with the thallium element.

Description

technical field [0001] The invention relates to the technical field of smelting wastewater treatment, in particular to a trapping agent for deep removal of thallium from smelting wastewater and a preparation method thereof. Background technique [0002] Thallium is a highly harmful heavy metal, which can cause damage to the nervous system and central system of the body after entering the human body. The toxicity of thallium to mammals is higher than that of Cd, Cu, Zn, Hg, etc., and second only to methylmercury. Thallium and its compounds are mutagenic, carcinogenic, and teratogenic, which can lead to the occurrence of various diseases such as esophageal cancer, liver cancer, and colorectal cancer, and pose a great threat to human health. In view of the high toxicity of thallium, the U.S. Environmental Protection Agency stipulates that the maximum content of thallium in industrial discharge water is 0.14 mg / L, and the maximum residual amount of thallium in drinking water is...

AI Technical Summary

Problems solved by technology

The chemical precipitation method is mainly to remove thallium ions from the water body in the form of sediment, but the treatment results usually cannot meet the thallium control standards, and at the same time, a lot of thallium-containing sludge is produced, the treatment cost is high, and secondary pollution may occur

Although the ion exchange method is recommended by the U.S. Environmental Protection Agency as one of the treatment methods for thallium-polluted water bodies, it is usually very susceptible to the influence of other coexisting alkaline earth metals in thallium-containing water bodies. The selectivity for thallium is not high, and there are disadvantages of frequent regeneration.

The solution extraction method is only suitable for the removal of thallium in a specific solution, and it is difficult to apply it to the purification of conventional thallium-polluted water bodies

The adsorption method has the advantages of large adsorption capacity, strong selectivity, and easy regeneration of the adsorbent. It is a promising technology for the treatment of thallium-polluted water bodies. Although it can reduce thallium in low-concentration wastewater to below 0.1 μg / L, there are Technical problems such as frequent regeneration, high operating costs, large fluid resistance, and difficult solid-liquid separation

[0005] Due to the existence of many thallium-containing minerals in my country, the waste water containing thallium produced by mining development and production is large, polluting, and difficult to treat.