A method for the comprehensive recovery of all elements by roasting biomass to reduce oceanic cobalt-rich crusts
A technology for cobalt-rich crusts and biomass, applied in the direction of improving process efficiency, can solve the problems of slow reduction rate of oceanic cobalt-rich crusts and high energy consumption for roasting, and achieve the effects of improving metal leaching rate and reducing rate.
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Embodiment 1
[0070] Such as figure 1 Shown, a kind of biomass roasting reduction oceanic cobalt-rich crust comprehensively recovers the method for all elements, comprising the following steps:
[0071] Step 1. Dry-grind the oceanic cobalt-rich crust until -200 mesh accounts for more than 90%;
[0072] Step 2. Mix the fine-grained cobalt-rich crusts obtained in step 1 with 15% to 20% of dried biomass, and roast in a roasting device at 450 to 500°C for 6 to 10 minutes. Nitrogen gas is introduced at a certain flow rate during the roasting process. Prevent oxidation of reduced products;
[0073] Step 3, leaching the roasted slag obtained by pyrolysis of step 2 at room temperature, in a sulfuric acid solution with a liquid-solid ratio of 3:1 to 5:1, and a sulfuric acid concentration of 1.0 to 1.4 mol / L, at a stirring speed of 300 to 400 rpm / min for 40 Filter after ~60min;
[0074] Step 4, adjust the pH value of the filtrate obtained in step 2 with 0.1mol / L NaOH solution to be 2 to 3.2, after...
Embodiment 2
[0082] A method for comprehensively recovering all elements by roasting biomass to reduce oceanic cobalt-rich crusts. The samples of cobalt-rich crusts from two different stations on the ocean floor are respectively taken, and experiments are carried out according to the method described in Example 1.
[0083] Grind samples 1 and 2 to -200 mesh, accounting for more than 90%, and dry them for later use, and dry the sawdust for later use. Samples 1 and 2 were mixed evenly with 15% dried sawdust, and roasted in a roasting device at 4500°C for 60 minutes. Nitrogen gas was introduced at a certain flow rate during the roasting process to prevent the reduction products from being oxidized.
[0084] The roasted slag was leached for 40 minutes at room temperature, in a sulfuric acid solution with a liquid-solid mass ratio of 3:1 and a sulfuric acid concentration of 1.0 mol / L, and filtered at a stirring speed of 350 rpm / min for 40 minutes to obtain filtrate 1 and filter residue 1. The f...
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