Method for smelting high-arsenic copper sulfide ore

Abstract

Provided herein is a method for smelting high-arsenic copper sulfide concentrate, which comprises the steps of: mixing the high-arsenic copper sulfide concentrate with quartz sand and CaO-containing material to obtain a mixed material; mixing the mixed material with oxygen-containing reactant gas and heating for reaction to obtain matte, slag and SO 2 -containing flue gas. By the addition of CaO and SiO 2 in the smelting process, the concentrate material, the CaO and the SiO 2 are allowed to react in the furnace under high temperature. The arsenic sulfides in the concentrate are oxidized first and then chemically react with slagging flux CaO to enter the slag phase in the form of calcium-based compounds of arsenic, iron arsenates and etc., thus reducing the arsenic content in the copper matte.

1 . A method for smelting high-arsenic copper sulfide concentrate, comprising:
 (A) mixing the high-arsenic copper sulfide concentrate with quartz sand and CaO-containing material to obtain a mixed material; and   (B) charging the mixed material and oxygen-containing reactant gas into a smelting furnace for reaction to obtain matte, slag and SO 2 -containing flue gas.   
     
     
         2 . The smelting method according to  claim 1 , wherein the step (B) is performed as follows:
 (B1) the mixed material is allowed to go through a conveying pipe ( 3 ) with inclination of 10° to 40° and enter a fluidizing feeding device ( 2 ), and then flow into a copper concentrate nozzle ( 1 ) under the fluidization action of the fluidizing feeding device ( 2 );   (B2) the mixed material and the oxygen-containing reactant gas are mixed into a flash furnace reaction tower ( 4 ) under the action of the copper concentrate nozzle ( 1 ) and reacted therein to obtain matte, slag and SO 2 -containing flue gas.   
     
     
         3 . The smelting method according to  claim 1 , wherein the high-arsenic copper sulfide concentrate contains 0.3 wt % to 1.8 wt % of arsenic. 
     
     
         4 . The smelting method according to  claim 1 , wherein the CaO-containing material is selected from the group consisting of quicklime, limestone and gypsum. 
     
     
         5 . The smelting method according to  claim 1 , wherein the CaO-containing material is added in an amount of 1 wt % to 10 wt % based on the mass of the mixed material. 
     
     
         6 . The smelting method according to  claim 1 , wherein the moisture content in the mixed material is less than 0.3 wt %. 
     
     
         7 . The smelting method according to  claim 1 , wherein the oxygen content of the said oxygen-containing reactant gas is 50% to 95%. 
     
     
         8 . The smelting method according to  claim 1 , wherein the grade of the matte is 50% to 70%. 
     
     
         9 . The smelting method according to  claim 1 , wherein the matte contains 0.2 wt % to 0.6 wt % of arsenic.