添加剂CaO、Al_(2)O_(3)和Cu_(2)O对铜渣黏度的影响

Effect of additives CaO,Al_(2)O_(3)and Cu_(2)O on the viscosity of copper slag

调控铜渣黏度是提高铜渣贫化效果、促进渣-铜分离的关键因素,本文通过采用高温黏度计测定铜熔渣的黏度,研究了添加剂CaO、Al_(2)O_(3)和Cu_(2)O在不同温度下对铜渣黏度的影响规律。研究结果表明:在相同温度条件下,铜渣的黏度随CaO含量的增加先降低后升高,当CaO含量增加到6%时,铜渣的黏度降至最低,当CaO含量达到7%时,CaO与渣中物质生成难熔化合物,导致渣黏度升高;在渣贫化过程中,Al_(2)O_(3)被认为是一种酸性物质,加入Al_(2)O_(3)可形成高熔点化合物并提高铜渣的液相温度,从而导致铜渣黏度的增加;在渣贫化过程中,Cu_(2)O与渣中的Fe^(2+)离子反应生成Fe_(3)O_(4),使铜渣黏度增加;随着添加剂Al_(2)O_(3)和Cu_(2)O含量的增加,改变了铜渣物相组成,提高铜渣的黏度流变表观活化能。

Adjusting the viscosity of copper slag is a key factor to improve the depletion effect of copper slag and promote the separation of slag-copper.In this paper,the viscosity of copper slag is measured by a high-temperature viscometer,and the effects of additives CaO,Al_(2)O_(3)and Cu_(2)O on the viscosity of copper slag at different temperatures are studied.The research has reached the following conclusions.Under the same temperature conditions,the viscosity of the copper slag first decreases and then increases with the increase of the CaO content;when the CaO content increases to 6%,the viscosity of the copper slag decreases to the minimum;when the CaO content reaches 7%,the CaO and the slag the substance generates refractory compounds,which causes the viscosity of the slag to increase.In the process of slag depletion,Al_(2)O_(3) is considered to be an acidic substance;the addition of Al_(2)O_(3) can form high melting point compounds and increase the liquid phase temperature of the copper slag,resulting in an in-crease in the viscosity of the copper slag.In the process of slag depletion,Cu_(2)O reacts with Fe^(2+) ions in the slag to form Fe_(3)O_(4),which increases the viscosity of the copper slag.With the increase of the content of additives Al_(2)O_(3) and Cu_(2)O,the phase composition of the copper slag is changed,and the viscosity rheological apparent activation energy of the copper slag is increased.