A method for the comprehensive recovery of all elements by roasting biomass to reduce oceanic cobalt-rich crusts

Abstract

The invention belongs to the field of utilization of seabed mineral resources, and discloses a method for comprehensively recovering all elements by roasting biomass to reduce oceanic cobalt-rich crusts. The present invention mixes oceanic cobalt-rich crusts and biomass evenly in a certain proportion, roasts them for a certain period of time under the condition of anaerobic medium and low temperature, and reduces the oceanic cobalt-rich crusts with the reducing gas generated while the biomass is cracked to make cobalt-rich crusts. The high-valent iron-manganese minerals in the crust are reduced to low-valent minerals. The reacted solid minerals are leached in sulfuric acid solution for a certain period of time, and filtered to obtain filtrate and filter residue. The filter residue is oxidized by hydrogen peroxide under low-acid conditions and complexed with chloride ions to obtain a platinum group element-enriched solution; the filtrate is precipitated step by step with sodium hydroxide and sulfide to obtain a solid phase mainly composed of Fe, Cu, Co, Ni and Mn, respectively. The product is extracted in the liquid phase to obtain a complete rare earth enrichment solution. The method realizes low-cost, high-efficiency, low-pollution, comprehensive recovery of oceanic cobalt-rich crust resources with all components, and has broad application prospects.

Description

technical field

[0001] The invention belongs to the field of utilization of seabed mineral resources, and discloses a method for comprehensively recovering all elements by roasting biomass to reduce oceanic cobalt-rich crusts. Background technique

[0002] Cobalt-rich crusts, also known as cobalt crusts and iron-manganese crusts, are crust-like iron-manganese oxides and hydroxides that grow on the surface of seabed rocks or debris. Because it is rich in cobalt, it is called cobalt-rich crust. It is mainly produced on the tops and slopes of seamounts and sea platforms with a water depth of 800-3000 meters. The bases on which it grows include basalt, glass clastic basalt and montmorillonite rock. Cobalt-rich crusts are widely distributed in the ocean, and are distributed on the seabeds of the Pacific Ocean, the Atlantic Ocean, and the Indian Ocean. The exit area mainly includes several large seamount chains such as Magellan Seamount, Marcus-Wake Seamount, Marshall Seamount, ...

Examples

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...

technical field

[0001] The invention belongs to the field of utilization of seabed mineral resources, and discloses a method for comprehensively recovering all elements by roasting biomass to reduce oceanic cobalt-rich crusts. Background technique

[0002] Cobalt-rich crusts, also known as cobalt crusts and iron-manganese crusts, are crust-like iron-manganese oxides and hydroxides that grow on the surface of seabed rocks or debris. Because it is rich in cobalt, it is called cobalt-rich crust. It is mainly produced on the tops and slopes of seamounts and sea platforms with a water depth of 800-3000 meters. The bases on which it grows include basalt, glass clastic basalt and montmorillonite rock. Cobalt-rich crusts are widely distributed in the ocean, and are distributed on the seabeds of the Pacific Ocean, the Atlantic Ocean, and the Indian Ocean. The exit area mainly includes several large seamount chains such as Magellan Seamount, Marcus-Wake Seamount, Marshall Seamount, ...

Examples

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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