A rotary kiln roasting mercury smelting system using lead-zinc smelting acid mud as raw material

Abstract

The invention provides a rotary kiln roasting mercury smelting system using lead-zinc smelting acid mud as raw material. The front end of the rotary kiln is equipped with an acid mud hopper, a lime hopper, a stirring mixer, a disc granulator, and a feeding device , pressure swing adsorption oxygen generator, the rear end of the rotary kiln is equipped with a discharge device, a negative pressure fan, a condensation tower and an exhaust gas treatment device, the tail end of the rotary kiln is installed on the base inclined downward, and the rotary kiln includes a front Covers, tugs, liner shells, drives, gear pairs, tires, heating jackets and kiln tail hoods. This system solves the recovery problem of acid sludge in lead-zinc smelting. At the same time, the direct mercury recovery rate of the system can reach about 95%, and the recovery rate can reach more than 99%, which has high economic benefits; at the same time, the mercury smelting system is closed, continuous, Mercury is extracted under negative pressure, which minimizes the fugitive emission of mercury.

Description

technical field [0001] The invention provides a rotary kiln roasting and smelting mercury system, in particular to a system for roasting and smelting mercury by using acid mud produced in the lead-zinc smelting process as a raw material, and belongs to the technical field of mineral smelting. Background technique [0002] There are two types of mercury smelting: fire method and wet method. Pyromercury smelting is to roast mercury ore or concentrate at a not too high temperature (450-800°C), directly reduce mercury to gaseous separation, and then condense it into liquid mercury. Pyrochemical mercury smelting has a relatively simple process and high technical and economic indicators. It is a traditional mercury smelting method at home and abroad. Commonly used roasting equipment includes rotary kiln, multi-hearth furnace, liquefied roasting and mechanical distillation furnace. The wet method of mercury smelting is to use sodium sulfide or hypochlorite solution to leach mercu...

AI Technical Summary

Problems solved by technology

Solve the problems of low production efficiency, serious environmental pollution and high energy consumption in the mercury smelting rotary kiln fired by coal furnace

However, in the above-mentioned mercury refining system, mercury ore is directly roasted as raw material, and the cost of mercury refining is relatively high.

And during the entire roasting process, the mercury vapor in the rotary kiln may overflow from the connection between the head and the tail of the rotary kiln, causing environmental pollution

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