Copper bromide recycling technology

First, the process

As shown in Figure 1. Bismuth matte by immersion, after roasting, leaching copper sulfate, hydrochloric acid leaching bismuth, iron scrap replacement processes, cast into a rough output Bismuth Bismuth, then recover copper from the copper sulfate solution recovered from the leaching residue of lead, silver, .

Figure 1 Process of processing the beryllium copper process

Second, the main technical conditions

(1) Dipping. Place the matte in the dipping tank, dip it with water, weather it in powder form, pump it to the centrifuge with a sand pump, until the washing water is neutral, and the waste alkali solution is placed in the underground storage tank.

(2) Roasting. The matte powder loaded in roaster off oxidizing roasting arsenic, antimony, sulfur, and metal oxide formation. The feed temperature is controlled to be lower than 550 ° C, the calcination temperature is 600 to 700 ° C, and the calcination time per furnace is 6 to 8 hours.

(3) Sulfuric acid leaching. Two-stage countercurrent leaching:

One leaching: starting acid 15-20 g / liter, final acid pH 2.5; leaching temperature 85 ° C; leaching time 1-2 hours; liquid-solid ratio: (5 ~ 8): 1.

Secondary leaching: starting acid 65-70 g / liter, final acid 45 ~ 50 g / liter; leaching temperature 95 ° C; leaching 1 ~ 2 hours, liquid-solid ratio 3: 1.

Washing: Filtered with a centrifuge and the wash water is combined with the leachate.

(4) Purification and removal of iron. The leachate is oxidized with KMnO _{4 to} oxidize Fe ^{2 +} to Fe ^{3 +} to form a precipitate of Fe(OH) ₃ , and the purified solution is a copper sulfate electrolyte.

(5) Electrowinning. A lead plate for the anode and a stainless steel plate for the cathode.

Electrolyte composition (g): Cu60～90, Fe5±, Mn0.5±, H ₂ SO ₄ 20～30; Electrolysis cycle 5～7 days: room temperature; current density 100～150A/m ² ; 1.8 to 2 volts.

(6) Leaching of hydrochloric acid. Two-stage countercurrent leaching:

One leaching: starting acid HCl 15%: liquid to solid ratio 3:1; stirring at room temperature for 2 hours.

Secondary leaching: starting acid HCl 15%; liquid-solid ratio 3:1; heating to 90 ° C stirring leaching for 2 hours. Filter residue to recover lead and silver.

(7) Iron filings replacement. The iron scraps are ground and the surface is acidified. The acid consumption is 1.3 to 1.5 times the theoretical calculation. Stirring at room temperature requires control of the acidity of the leachate to about pH 0.5 and the replacement time of 4 to 6 hours.

After the replacement, the solution is filtered and placed in an underground storage tank, neutralized with the spent caustic, and discharged to pH 8. The sponge is melted in the ingot under the cover of solid alkali solution and sent to the refining treatment.

Third, the main equipment

One set of cooking furnace.

One immersion tank; sulfuric acid leaching tank, purification iron removal tank, hydrochloric acid leaching tank and displacement tank, one jacketed enamel reaction kettle and one underground storage tank.

Electrolytic tank: It is made of hard polyethylene plastic tank 700×370×250 mm.

Two centrifugal filters.

Coffee Canister

Coffee Canister