A method for recovering valuable metals from metallurgical waste
A technology for metallurgical waste and valuable metals, applied in the fields of non-ferrous metals and valuable metals recovery, can solve the problems of increasing energy consumption and carbon dioxide emissions, and achieve the effects of reducing carbon dioxide emissions, achieving metal extraction, and high metal leaching rate
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Embodiment 1
[0036] Weigh the copper smelting slag containing (dry basis, mass percentage, the same below) 2.33% Cu, 0.44% Co, 4.03% Zn, 51.04% Fe, 0.54% S, grind it until 60% passes through a 0.15mm sieve, and divide it into Three equal parts, respectively add water and stir to make uniform slurry, then quickly add 95% w / w industrial sulfuric acid. The first part of slag: water: acid (mass ratio) is 1: 1.2: 1.2; the second part of slag: water: acid (mass ratio) is 1: 0.5: 0.3; the third part of slag: water: acid ( mass ratio) is 1:2:3. When mixing acid, the slag, water, and acid mixture react violently with a large amount of heat release, the temperature rises to boiling instantly, and the slag becomes loose and dry. After the three acid hydrolyzed slags were placed for 2 hours, the first acid hydrolyzed slag was mixed with cobalt concentrate containing 1.62% Cu, 0.58% Co and 28.55% S according to the mass ratio of raw slag and cobalt concentrate at 1:1, and then Blow in air and bake at...
Embodiment 2
[0038] Add water to a portion of nickel converter slag containing 0.89% Co, 2.05% Ni, 0.40% Cu, and 0.28% S and wet grind it until all the solids pass through the 0.3mm sieve to remove part of the water, then mix it into commercially available 95% Mix w / w industrial sulfuric acid evenly so that slag: water: acid (mass ratio) is 1:1:1. After standing for 36 hours, mix and roast with pyrrhotite concentrate containing 1.26% Ni, 0.50% Cu, 0.033% Co, and 22.76% S at a mass ratio of raw slag to copper concentrate of 1:1.2 and roast for 1 hour at a roasting temperature of 650°C. Then add water until the liquid-solid ratio is 3:1 and leaching while hot, the leaching time is 3h. The slurry after leaching was filtered, and the chemical composition of the filtrate and filter residue were analyzed respectively, and the leaching rate was calculated according to the analysis results as follows: Ni 90.25%, Co 91.13%, Cu 87.87%.
Embodiment 3
[0040] Add water to a portion of leaching slag from a wet zinc smelter containing 15.67% Zn, 38.78% Fe and 0.28% S and stir it with water to make a uniform slurry, then quickly add 95% industrial sulfuric acid and mix evenly. The slag: water: acid (mass ratio) is 1:0.8:1.2. After standing for 24 hours, mix it with zinc concentrate containing 45.34% Zn and 36.37% S at a mass ratio of raw slag to concentrate of 1:0.8, roast at 720°C for 1 hour, add water until the liquid-solid ratio is 3:1, and leach for 3 hours while hot. After leaching, the solid and liquid were separated, and the chemical composition of the solid slag and the leaching solution were analyzed respectively. According to the analysis results, the zinc leaching rate was calculated to be 96.45%.
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