Method for preparing steam-pressed brick through gold mine tailings

Abstract

The invention discloses a method for preparing a steam-pressed brick through gold mine tailings, solving the problems that few technologies are provided for specially processing the gold mine tailings, the alkaline chlorination process and the pressure filtration and dry heaping process are unstable in effect, the bearing capacity of a tailings pond is limited, and the bearing capacity is needed to be maintained and managed for a long time. The method comprises the following steps in sequence: adding an oxidant in the gold mine tailings; uniformly mixing the oxidant and the gold mine tailings; feeding the mixture into a bin; crushing and grinding lime and gypsum and then adding to the bin; feeding cement and water to the bin in sequence; uniformly stirring cement and water and then mixing with the gold mine tailings, the oxidant, lime, gypsum and cement, so as to obtain the mixture; digesting the mixture in a digesting bin for 2 to 3 hours; milling through wheels; transferring the milled mixture into a brick machine; pressing the milled mixture to obtain the brick blank; standing for 3 to 6 hours at normal temperature; maintaining in a steam pressing kettle in a steam pressing way for 5 to 10 hours at 170 to 200 DEG C under 0.8 to 1.5MPa; and cooling to room temperature, so as to obtain the steam-pressed brick product. According to the method, cyanide in the gold mine tailings is damaged, the resource utilization of the gold mine tailings is realized, and the environmental protection benefit and the economic benefit are achieved.

Description

technical field

[0001] The invention belongs to the technical field of hazardous waste treatment and disposal, in particular to a method for preparing autoclaved bricks from gold tailings. Background technique

[0002] Gold production generally adopts cyanide gold extraction method, in which cyanide must be added, resulting in a certain amount of cyanide remaining in the tailings. Because gold tailings are mostly treated in the form of inventory, with the expansion of gold production scale and the extension of mining history, the accumulation of gold tailings has increased year by year, which not only occupies a large amount of land, pollutes the atmosphere, surface water and groundwater, but also many tailings pools are overdue. Or overload use, or even illegal operation, so that the tailings stockpile has great potential safety hazards. In addition, the construction and maintenance management of tailings ponds also need to invest a lot of money. Therefore, it is imminent...