Copper-nickel slag treating method

Abstract

A treatment method for copper-nickel thermometallurgy furnace slag is to place the reducing carbon in the bottom of slag washing furnace, inject a layer of 5-50 cm low deg. matte and 10-60 cm to-be-washed furnace slag on the carbon respectively, and produce a large amount of CO gas bubbles by means of chemical reaction between oxygen in the thermla matte and the reducing carbon, gas bubbles in the process of floating upward tring about the upper thermal matte foaming and rising to enter the upper slag layer for thermal matte slag washing, and noble metal in the slag is recovered by matte-slag reaction. The thermal matte floated-up-into slag under the action of gravity automatically returns tack again to the furnace bottom such that slag is repeatedly washed in circulation for 30-60 min, then the slag is stood still in a thermo-insulated intermediate ladle to deposit for 30-60 min so to make sufficient deposition, and the depleted slag is discarded.

Description

technical field [0001] The present invention relates to copper and nickel pyrometallurgical technology, and in particular provides a hot matte slag washing method to improve the recovery rate of cobalt, nickel, copper and other precious metals remaining in high temperature slag, and then improve the efficiency of copper and nickel pyrometallurgical process. Comprehensive economic indicators. Background technique [0002] The refining industry of copper and nickel is one of the most important industrial sectors in the modern nonferrous metallurgical industry. Copper, nickel and its by-product cobalt have been widely used in various important industrial sectors. These metals, especially cobalt and nickel, have become one of the key strategic materials of modern industry due to the regional distribution of mineral resources and the irreplaceability in industry. [0003] For copper sulfide ore, nickel sulfide ore or copper-nickel sulfide symbiotic ore, the main task of the mode...

AI Technical Summary

Problems solved by technology

The advantage of this process is that the converter slag can be processed separately to obtain cobalt nickel matte or cobalt matte without interfering with other smelting processes. Different converter slags can also adjust the treatment process according to their specific composition, such as adding different amounts of charge (coke , vulcanizing agent, quartz sand and lime, etc.), choose different treatment temperatures and holding times to obtain better metallurgical physical and chemical conditions, and improve the yield of precious metals in the slag. The main disadvantage of this process is that the slag in the depletion furnace The fluidity of the slag is poor, the contact opportunity between the precious metal oxide and carbon in the slag is small, and it is a solid / liquid reaction, so the reduction and vulcanization reaction in the furnace is slow and the treatment cycle is long (generally 4-6 hours can get better results) ), while the converter blowing production rhythm is fast (generally put slag once an hour, the difference between the two production rhythms will cause blockage of the entire smelting production line, so how to strengthen the reduction and vulcanization reaction in the lean electric furnace and shorten the processing time of converter slag It is one of the important problems to be solved urgently in this process. On the other hand, no matter whether the smelting furnace is returned to the furnace or the depletion furnace is treated separately, the coke fragments as the main reducing agent are added from the surface of the converter slag. The specific gravity of carbon is smaller than that of slag. The reduced carbon either floats on the slag surface originally, or even if the carbon is sprayed into the slag with a spray gun, they will quickly float from the slag to the slag surface. Under high temperature conditions, most of the carbon particles actually oxidizes and burns as a fuel

Only a very small part of carbon is used as an effective reducing agent to participate in the reduction reaction of precious metals in the slag, so the reduction efficiency is very low, and it is difficult to fully reduce the residual cobalt and nickel in the slag, so the yield is relatively low

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