SU1742342A1 - Method for processing sulfide raw materials containing copper - Google Patents

Abstract

Using; The invention relates to metallurgy, in particular to the processing of copper sulphide-containing raw materials by chloride sublimation. SUBSTANCE: chalcopyrite concentrate is processed with a mixture of molecular chlorine and natural gas at a ratio of 10: 1 at 500 to 550 ° C under flowing conditions, with a contact time of 15 to 20 seconds. 1 tab.

Description

This invention relates to the processing of sulphide copper-containing ores and concentrates - chalcopyrite.

Methods are known for the processing of sulfide ores and concentrates by the method of chloride distillation, which allow the extraction and separation of iron from non-ferrous metals.

There is a method in which sulphide ore is subjected to chlorination at 700-1200 ° C and a pressure of 1-5 atm with a mixture of molecular chlorine and air. The volatile chlorides of copper and other non-ferrous metals are removed with waste gases and precipitated in settling basins. The ash is then leached and iron is isolated in the form of various compounds.

The disadvantages of the known methods are the implementation of the process in two stages (roasting and leaching), which complicates the process (in essence, leaching is a separate process with additional waste), as well as the release of sulfur in the form of dioxide, which makes it difficult from the point of view of its complete recycling and pollution. In addition, oxychlorides are formed in the process and create the problem of their utilization, and

Also, carrying out the process at elevated temperatures requires high energy consumption and complicates the operation of the equipment (reduces the service life of the equipment).

The aim of the invention is to simplify the process.

This goal is achieved by processing chalcopyrite concentrate with a mixture of molecular chlorine and natural gas in a ratio of 10: 1 in one stage at lower temperatures (500 - 550 ° C), under flow conditions and contact time 15 - 20 s, B In these conditions, as a result of the flow of the chain process, it is possible to obtain and remove anhydrous copper (II) and iron (III) chlorides from the reaction zone in the gas stream, as well as sulfur in an elemental form. The slag residue is aluminosilicate.

The difference of the proposed method is that a mixture of chlorine and methane is used as a chlorinating agent, the process is carried out without air (oxygen) and at low temperatures. Because no oxygen is supplied to the system, it is possible to prevent the formation of oxygen.

WITH

2

go s. Yu

oxychloride and sulfur oxidation

BS02.

PRI me R. In a quartz reactor, heated by an electric furnace, at 500 - 550 ° С a quartz boat is placed with a hinge of 5 g of copper concentrate of the following composition,%: Si 17.92; Fe 24.3; Zn 1.73; Pb 0.29; S 33.04. A mixture of natural gas and chlorine is passed through the reactor at a molar ratio of CI2. CH4 10: 1 and atmospheric pressure for 30 minutes. The temperature in the reactor is measured by platinum with a platinum-rhodium thermocouple placed in a quartz case. The flow rates of natural gas and chlorine are controlled by rheometers. At the exit of the reactor, different temperature zones are created and various chlorides are selectively precipitated. The process begins with the release of sulfur vapor in the form of yellow smoke, which is deposited in the sump. Iron in the form of anhydrous trichloride and copper chloride in the form of needle-like crystals precipitated in various septic tanks. Separately precipitated also

0

five

0

zinc and lead chlorides. The unreacted residue in the boat is aluminum silicate.

The results of the experiments at varying the process parameters are given in the table.

From the data presented in the table, it follows that the most optimal process conditions are T 500 - 550 ° C, the Cl 2: CH i ratio is 10: 1 and the gas flow rate ensures a contact time of 15 - 20 s. In addition, the resulting chlorides of iron and copper for purity correspond to GOST.

Claims (1)

Claims The method of processing sulfide copper-containing raw materials, including chloride sublimation, characterized in that, in order to simplify the process, chloride extraction is carried out in flow conditions with a mixture of methane-chlorine in the ratio of 1:10 at 500 - 550 ° C and contact time gas flow 15 - 20 s.