Method for soiling red mud by using pyrite cinder

Abstract

The invention discloses a method for soiling red mud by using pyrite cinder. The method includes the following steps: evenly mixing to-be-treated red mud and biomass to obtain a red mud mixture and laying the red mud mixture on a bottom layer; laying a water-retaining material over the red mud mixture; laying a neutralizing material over the water-retaining material, wherein the neutralizing material is a mixture of pyrite cinder and an oxidant and geotextile is laid between the water-retaining material and the neutralizing material; regularly spraying the neutralizing material; and when the pH of the red mud mixture of the bottom layer is 6-9, removing the neutralizing material layer and evenly mixing the treated red mud mixture and the water-retaining material to obtain soiled red mud. The pyrite cinder is used to be oxidized in air to generate sulfur dioxide and then is reacted with water to generate sulfuric acid to dealkali the red mud, and organic matters can improve the nutrients of the red mud to finally achieve the purpose of soiling of the red mud. The method is simple and cheap in raw material sampling, accords with national conditions of China, and can carry out large-scale soiling utilization of the red mud.

Description

technical field [0001] The invention belongs to the technical field of mining waste utilization and red mud soilization, and in particular relates to a method for using pyrite slag to soil red mud. Background technique [0002] Red mud is a kind of bulk solid waste produced in the alumina industry. Because it contains iron oxide, its color is generally red, so it is called red mud. On average, for every ton of iron oxide produced, 1 to 2 tons of red mud will be produced. As of 2015, the annual output of red mud in my country has reached nearly 35 million tons. At present, red mud is mainly processed by stockpiling. Due to the Mud contains a large amount of combined alkali, and its pH is generally above 11, which leads to high alkalinity that will pollute the soil environment and groundwater around the red mud stockpile. At the same time, there is a risk of dam failure in the red mud stockpile. The safety of people's life and property has caused great hidden dangers, which urg...

AI Technical Summary

Problems solved by technology

[0008] At present, most of the soil-based resource utilization methods of red mud are to treat red mud in the form of additives. Compared with the huge annual output of red mud in my country, the amount of recovery is very small; the processing method of some bulk red mud is generally "Treating waste with waste", mixing one kind of waste into red mud to achieve the effect of red mud restoration, but there is a problem of secondary pollution, and it is difficult to separate the two wastes after treatment; therefore, now we need a A method that can process red mud in large quantities and is not prone to secondary pollution