Pyrite sintered slag gold extraction technology

Abstract

The invention discloses a pyrite sintered slag gold extraction technology comprising the steps of slurry preparation, ultrasound dispersion grind-leaching, ultrasound leaching, carbon slurry leaching, and smelting to cast gold. The technology increases leaching rate of gold and meanwhile completely solves the problem of excessively high cost and environment pollution which are difficult to solve in the industry. The technology really achieves green production and environment-friendly gold extraction.

Description

technical field [0001] The invention relates to a process for extracting gold from sulfuric acid slag. Background technique [0002] According to statistics, 10 million tons of gold-containing sulfuric acid slag is discharged every year in my country, and currently only slag greater than 3 g / ton can be utilized. Due to the low gold content, gold recovery rate, large investment in recovery equipment, and high processing costs, most of the clinker is directly used in cement plants to produce cement, and the gold contained in it is lost in vain, which is a pity. [0003] The current chlorination process is only suitable for treating sulfuric acid slag with a gold grade higher than 2.5 g / t. No matter how low the grade is, the profit will be low, and the investment will be difficult to recover in a short period of time. Therefore, although it has good social benefits, the economic benefits are not obvious; Although the immersion method can reduce the production cost, it cann...

AI Technical Summary

Problems solved by technology

If this section can be cut off by other means, the investment and production costs of the cyanidation method will be greatly reduced

[0006] (2) Since the ore washing is carried out by discharging the overflow of the thickener after grinding to remove impurities such as iron and copper dissolved in the slag, cyanide cannot be added during the grinding process, so the barren solution cannot be fully recycled, and the barren solution Discharge after treatment not only increases production costs, but also causes environmental pollution problems

[0007] (3) Many sulfuric acid plants are built in cities, and there is not enough space to build large tailings ponds

The investment in the filtration section is increased, and the slag particle size analysis due to grinding increases the difficulty of filtration and increases the production cost

[0008] (4) The replacement of zinc powder will increase the concentration of zinc in the barren solution, worsen the leaching conditions, and reduce the recovery rate of gold; due to the high hardness of the slag, the use of other carbons will cause large wear and tear of the charcoal, a large amount of gold loss, and high production costs.

[0009] (5) The biggest disadvantage of the cyanidation method is that the reaction time is too long, generally at least 16 hours, which requires the construction of a large volume of leaching tank, increased investment, increased power consumption, and increased plant area