Method for preparing ferric hydroxide-based raw materials containing high value elements

An iron hydroxide-based, high-value technology, applied in the directions of iron oxide/iron hydroxide, process efficiency improvement, solid waste removal, etc., can solve the difficult, time-consuming and unfavorable large-scale production of iron-based waste high-value elements metering and other issues, to achieve the effect of facilitating further utilization, reducing security risks, and facilitating trade circulation

Active Publication Date: 2015-03-25
GANZHOU RECYCLE NEW TECH
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AI Technical Summary

Problems solved by technology

This method has the following defects: A, large acid consumption and high cost; B, to allow the waste to be fully oxidized, the corresponding equipment is complicated and needs to consume a lot of energy and power; C, the yield of some high-value elements is low; D. During the oxidation process, exhaust gas containing black smoke will be produced, which is not easy to handle and pollutes the environment
[0012] This patent also has the following defects: A. The reaction time is long; B. The power and manpower consumption of the operation process is large, which is not conducive to large-scale production; C. The production cost is high; D. The leaching rate of high-value elements is low and the yield is low
But this patent also has the following defects: A, long time, slow response speed; B, large space occupation; C, many intermediate products and turnover materials
[0014] None of the above methods can solve the problems of iron-based waste sampling and high-value element measurement difficulties, spontaneous combustion, long reaction time, and low equipment utilization.
These existing methods for treating iron-based waste have long process flow, low yield, time-consuming, high energy consumption, and there may still be potential safety hazards of spontaneous combustion during transportation, production and utilization.

Method used

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  • Method for preparing ferric hydroxide-based raw materials containing high value elements

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] see figure 1 .

[0089] The NdFeB waste slag in the form of hard clay lumps can be ignited with matches, and it will spontaneously ignite when heated to about 75°C, and the ignition point is 104.4°C according to the measurement. Grinding into NdFeB alloy waste with a particle size of ≤5mm. After testing, REO23.11wt%, CoO1.22wt%, Fe42.53wt%, combustible organic matter calculated as C element 3.85wt%, moisture 15.02wt%, and the balance for other substances. Take 2000Kg of NdFeB alloy waste, 1100L of water and 400L of 7N hydrochloric acid and mix them evenly in a reaction pot. The temperature of the materials rises to 48°C and keeps stirring so that the Reynolds number Re=ρND 2 / μ≥2240000 (where ρ is the fluid density, N is the rotational speed, D is the diameter of the stirring paddle, μ is the viscosity, the same below), with 5-20M 3 / min flow into the reaction pot with compressed air at about 50°C. During the process, the reaction temperature is controlled at 50-90°C...

Embodiment 2

[0102] see figure 1 .

[0103] NdFeB waste slag can be ignited with a match, and it will catch fire when heated to 55°C, and the ignition point is 105°C according to the measurement. After wet ball milling, it becomes NdFeB alloy waste with a particle size of ≤0.15mm. After testing, REO18wt%, CoO0.99wt%, Fe33.53wt%, combustible organic matter in terms of C elements are 4.85wt%, moisture 30.74wt%, and residual Quantities are other substances. Take 2000Kg of the NdFeB alloy waste, put it into a reaction pot with 300L of water and 25L of 98% industrial sulfuric acid and mix evenly, keep stirring until the Reynolds number Re=10460, and use 0.2-1M 3 Oxygen is fed into the reaction pot at a flow rate of / min, and the temperature increases by 5-10M after the temperature reaches 50°C 3 / min air, during the process, the reaction temperature is controlled to be 70-100°C by replenishing water and other means. After reacting for 1.5h, the prepared material is sent to a rotary dryer tha...

Embodiment 3

[0109] see figure 1 .

[0110] NdFeB waste slag can be ignited with matches, and it will catch fire when heated to 45°C. It has been detected that REO27.67wt%, CoO0.95wt%, Fe47.46wt%, combustible organic matter calculated as C element is 10.4wt%, moisture is 6.7wt%, and the balance is other substances. Take 100g of the aforementioned NdFeB alloy waste with a particle size of ≤0.1mm, put them into a three-necked flask placed in an ultrasonic water bath at 70°C, and mix them evenly with 500ml of water and 2.7gAR ammonium chloride, and keep the Reynolds number Re=ρND 2 / μ≥29000, feed oxygen into the three-necked flask at a flow rate of 1L / min, and after 4 hours of reaction, 287g of ferric hydroxide-based raw materials containing high-value elements are obtained. Wherein Y(Fe) is 0.01wt%, Y(Fe 3+ ) is 16.26wt%. The ferric hydroxide-based raw material containing high-value elements is in the form of agglomerates, which cannot be ignited with a match. Keep the ignition source he...

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Abstract

The invention relates to a method for preparing ferric hydroxide-based raw materials containing high value elements, belonging to the technical field of resource recycling and wet metallurgy. The preparation method comprises the following steps: burdening, reacting and drying iron-based wastes, thereby preparing the ferric hydroxide-based raw materials containing high value elements comprising hydroxides of iron, high value element compounds and combustible organic matters, wherein the iron and high value elements mainly refer to hydroxides. The product prepared by the invention is powder or breakable agglomerate, is not subjected to spontaneous combustion at the temperature of less than or equal to 200 DEG C, and has the advantages of texture uniformity, difficulty in spontaneous combustion, convenience in use, safety, low consumption of chemical raw materials, high value element dissolution rate and the like. The fire risk of iron-based wastes in the transport, loading and unloading, storage and production processes is eliminated. The preparation method and equipment are simple, easy control is realized, the reaction heat is fully utilized, the reaction speed is high, the security and stability are high, the treatment capacity is high, the production cost is low, the consumption of power, manual labor and energy is greatly saved, and the method is suitable for industrial production.

Description

technical field [0001] The present invention relates to a method for the preparation of ferric hydroxide-based raw materials containing high-value elements. The invention belongs to the field of resource recycling and hydrometallurgy technology. Background technique [0002] In the production and use of iron-based alloy materials mainly composed of iron and high-value elements (hereinafter referred to as iron-based materials), a large amount of debris, leftover materials, slag materials, sludge materials, defective products, etc. containing high Materials with valuable elements (hereinafter referred to as iron-based waste). The iron and high-value elements in the iron-based waste are mainly in the form of simple substances and / or alloys; the high-value elements in the iron-based waste include at least one of rare earth, cobalt, nickel, titanium, copper, manganese, zinc and other elements kind. According to relevant data, these iron-based waste materials contain a large am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00B09B3/00
CPCC01G49/02C22B7/00C22B15/00C22B19/30C22B23/00C22B30/06C22B34/12C22B34/32C22B47/00C22B59/00Y02P10/20
Inventor 刘明彪刘征官谢楠黄绍权
Owner GANZHOU RECYCLE NEW TECH
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