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Apparatus and method for recycling by-products of smelting process

A technology of by-products and processes, which is applied to the recovery and use device and field of by-products of smelting process, and can solve the problems of high operating costs, high roasting furnace equipment costs, and high equipment costs

Inactive Publication Date: 2016-06-29
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of energy is required in the HCl generation reaction, and the amount of one reaction is limited, so it is necessary to maintain a high circulation amount
In addition, high-temperature hydrochloric acid needs to be condensed and treated again, so the safety of the equipment needs to be considered, and a reactor for performing two steps is also required, so the equipment cost is high
[0007] U.S. Patent No. 5,911,967A and U.S. Patent No. 6,797,240B2 have the advantage that the reaction of the above two steps is carried out in a spray roaster (sprayroaster), but it is necessary to pass the fuel in the roaster (roaster). Direct combustion maintains a temperature above 650°C, so the operating cost is high, and in order to reuse HCl, high-temperature HCl and H 2 After O and combustion gas are cooled to normal temperature, they are absorbed by water to extract HCl, and the equipment cost of the roaster itself is also relatively high.

Method used

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  • Apparatus and method for recycling by-products of smelting process
  • Apparatus and method for recycling by-products of smelting process
  • Apparatus and method for recycling by-products of smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4

[0166] Examples 1 to 4: Evaluation of FeCl 2 Oxidation reactions in aqueous solutions

[0167] The reduced ore is leached through a pilot plant and the FeCl thus obtained is used for backup 2 aqueous solution. In the oxidation reactor, the FeCl 2 Aqueous solution and O 2 react.

[0168] In addition, in order to carry out the reaction as a benchmark for the oxidation reaction, reagent grade FeCl was prepared 2 aqueous solution and for comparison, reagent grade FeCl 2 The concentration of the aqueous solution is about 4N (standard concentration) based on Cl. At this time, the reagent grade FeCl 2 The concentration of [Cl] in the aqueous solution is the same as that of the pilot leachate FeCl 2 The concentration of [Cl] in is approximate.

[0169] Reagent FeCl 2 The specific gravity of the aqueous solution is about 1.2g / ml, and the initial acidity is around pH≒4. This is because in Fe +2 Under almost no free (free) [HCl]. in with O 2 After the reaction, the ac...

Embodiment 5 to 8

[0177] Examples 5 to 8: Evaluation of Oxidation Reaction Catalysts

[0178] in the pass O 2 to oxidize the FeCl obtained from the pilot leachate 2 In the step of the aqueous solution, 2 wt% of the oxidation reaction catalyst was added, and the results are shown in Table 2 below.

[0179] [Table 2]

[0180]

[0181] It can be seen that the reaction rate is increased by the reaction catalyst. In addition, in the whole reaction system, CaCl is preferably 2 Concentrated corresponding to the amount of Ca contained in the initial mineral, this can be achieved by oxidizing FeCl 3 The solution is recirculated to achieve this.

[0182] With regard to the effect of pressure on the reaction rate, the more the reaction pressure increases, the more significantly the reaction rate increases, which means that O 2 The amount of dissolution has a great influence on the activation and speed of the reaction.

Embodiment 9 to 11

[0183] Examples 9 to 11: by FeCl 3 Leaching and Precipitation Reaction of Aqueous Solution

[0184] According to an implementation example, in the leaching reaction of the reduced ore, even if the ferric compound (for example: FeCl 3 ) in aqueous solution instead of HCl also achieves good leaching reactions.

[0185] The leaching reaction is carried out at a temperature below 100°C. After putting 4 to 5g of reduced ore (wet) into 30ml of water, slowly add 3N FeCl 3 Solution 60ml.

[0186] After the leaching reaction, the solution was sampled and the Ni and Fe in the solution were quantitatively analyzed by ICP spectroscopic analysis.

[0187] In the precipitation reaction, through Ca(OH) 2 Use after neutralizing the leaching solution. When applied in an actual process, a neutralization process with a pH of about 3 to 4 is required to remove impurities, so the same conditions are also used in this experiment.

[0188] After neutralization and filtration, 1 g of redu...

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Abstract

Addressed are an apparatus and method for recycling by-products of a smelting process, wherein the apparatus comprises: a leaching tank for leaching reduced ore; an oxidation tank disposed sequentially after the leaching tank and oxidizing ferrous iron oxide produced in the leaching unit; a supplying pump for supplying a ferric iron compound obtained through oxidation of a ferrous iron oxide compound in the oxidation tank; and a supplying pipe connecting the supplying pump to the leaching tank.

Description

technical field [0001] The invention relates to a device and method for recycling by-products produced in a smelting process. Specifically, it relates to a device and method for recycling iron-containing by-products produced in a nickel smelting process. Background technique [0002] Nickel-containing ores include limonite and saprolite, which contain a large amount of iron. A typical nickel recovery method is a method of leaching nickel through an acid hydrolysis reaction. This nickel hydrometallurgy technology can be cited as the patent international application publication WO2012081896A2 and the like. [0003] The acid mainly used in the nickel leaching reaction is hydrochloric acid, sulfuric acid or nitric acid. Among them, a large amount of by-product FeCl is produced in the nickel hydrometallurgy process using hydrochloric acid 2 aqueous solution. [0004] At present, the by-product FeCl has been studied 2 The processing method, and this method is also applied in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/06C22B7/04
CPCC22B3/02C22B7/04Y02P10/20C22B23/06
Inventor 金倞焄李相民尹铉箕李权烈申彩浩
Owner POHANG IRON & STEEL CO LTD