Method for controlling amount of hydrated silicatein crystal water in high-silicon-copper-matte oxygen-pressure acid leaching

Abstract

The invention relates to a method for controlling the amount of hydrated silicatein crystal water in high-silicon-copper-matte oxygen-pressure acid leaching, which belongs to the field of nonferrous metal hydrometallurgy. The method disclosed by the invention comprises the step that in the process of oxygen-pressure acid leaching, leached silicon dioxide is separated out and then subjected to slag intake by hydrated silicatein (SiO2.nH2O). By controlling the concentration of ore pulp and the technological parameters of oxygen-pressure acid leaching, the amount of formed hydrated silicatein crystal water is low, the supernatant rate is greater than 40% when the ore pulp stands for 30min, the moisture content of a filter cake after filter pressing is 30-40%, and the volume of filter cake is 1.5-2.0 times as large as the volume of raw materials. According to the technical scheme of the invention, the volume of leached slag can be effectively controlled, ore pulp which is easily clarified and filtrated is obtained, and the water content of the filter cake is low, so that the amount of water for washing the filter cake can be reduced, and the slag-intake loss of dissolved-out copper is reduced; the volume of a slag phase in leached ore pulp is reduced, and the ore pulp is clarified by using ore pulp thickening; and after the leached ore pulp is subjected to solid-liquid separation, the water content of the filter cake is reduced, thereby reducing the amount of water for washing the filter cake, saving the consumption of water, and facilitating the volumetric balance in the process.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of non-ferrous metals, and in particular relates to a method for controlling the crystallization water amount of hydrated silicon protein in high-silicon copper sulfonium oxygen pressure acid leaching. Background technique [0002] High-silicon copper matte is produced by top-blown, bottom-blown and side-blown smelting furnaces. When copper matte is discharged, it will be mixed with lead-rich slag. The main component of lead-rich slag is lead silicate (PbO.SiO 2 ), thus forming a high-silicon copper matte. When leaching copper in copper matte by oxygen pressure acid leaching process, the silicon in lead silicate is dissolved in orthosilicic acid (H 4 SiO 4 ) form enters the solution, and the orthosilicic acid in the solution is precipitated into slag in the middle and later stages of the reaction. [0003] Jin Bingjie published in the "Journal of Process Engineering" (Volume 8, Issue 6) paper "Ox...

AI Technical Summary

Problems solved by technology

[0005] In Mai Zhenghai's master's degree thesis "Experimental Research on Pressure Leaching of Low-grade High-Si Zinc Oxide Ore", the leaching solution obtained by leaching at normal temperature and pressure was placed in an experimental oxygen autoclave, and the reaction time was controlled for 90 minutes. When the pressure is 0.8Mpa, the removal rate of silicon in the leaching solution is 95%, and the water content of the obtained filter cake is nearly 90%, but the paper does not mention the form of silica in the slag, nor does it involve the regulation of the settling performance of the leached pulp , the volume and water content of the filter cake

Images