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Method for synthesizing strip-shaped ferrous oxalate from hematite slag in one pot

A technology of hematite slag and ferrous oxalate, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve the problem of low hematite slag, achieve mild reaction conditions, Broad prospects for industrial application and the effect of improving purity

Active Publication Date: 2022-03-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that ferrous oxalate has not been produced through high-value hematite slag in the industry, the present invention provides a method of dissolving and recrystallizing to convert hematite slag into ferrous oxalate in one step, aiming at realizing the production of oxalic acid under mild conditions. One-pot preparation of ferrous iron, and improve the conversion rate of one-pot reaction, and solve the problem of low-value utilization of hematite slag

Method used

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  • Method for synthesizing strip-shaped ferrous oxalate from hematite slag in one pot
  • Method for synthesizing strip-shaped ferrous oxalate from hematite slag in one pot
  • Method for synthesizing strip-shaped ferrous oxalate from hematite slag in one pot

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Embodiment 1

[0046] Present embodiment adopts the hematite slag that zinc smelting produces (XRD sees figure 1 , see SEM figure 2 ) the method for synthesizing ferrous oxalate dihydrate, carry out according to the following steps:

[0047] (1) get hematite slag 3g and join in the middle of solvent water and stir to obtain slurry, the mass ratio of solvent water and hematite slag is 16:1;

[0048] (2) Synchronously add leaching agent oxalic acid and reducing agent ascorbic acid to the slurry in step (1) (add a mixed solution of oxalic acid and ascorbic acid); the mass ratio of leaching agent, reducing agent and hematite slag is 1.5:1:1 , mixed uniformly to obtain a precursor system;

[0049] (3) The precursor system is stirred at 60°C (stirring speed is 250r / min) and reacted. The reaction process is carried out in an open container, and the reaction time is 2h. After the reaction, wash with distilled water or absolute ethanol, and pour off the supernatant , repeated 3 times to obtain th...

Embodiment 2

[0052] Compared with Example 1, the difference is only that the ratio of oxalic acid is changed, wherein the weight ratio of oxalic acid and hematite is respectively (a) 2:1; (b) 2.5:1 (the amount of hematite slag is the same as that in the embodiment 1).

[0053] It was found by measurement that the treated products all had products with elongated structure and morphology similar to that of Example 1. Its SEM image is shown in Figure 5 (The picture on the left is case a; the picture on the right is case b). In terms of iron, the conversion rates of raw materials are 96% and 97%, respectively.

Embodiment 3

[0055] Compared with Example 1, the difference is only that the ratio of ascorbic acid is changed, wherein the weight ratios of ascorbic acid and hematite slag are respectively: (a) 1.5:1; (b) 2:1 (the amount of hematite slag is the same as Embodiment 1);

[0056] It was found by measurement that the treated products all had products with elongated structure and morphology similar to that of Example 1. For example, the SEM images of group a experiments are shown in Image 6 . In addition, in terms of iron, the conversion rates of raw materials are 95% and 96%, respectively.

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Abstract

The invention belongs to the technical field of hydrometallurgical slag treatment and comprehensive recovery, and particularly relates to a method for synthesizing strip-shaped ferrous oxalate from hematite slag in one pot, which comprises the following steps: synchronously adding oxalic acid and a reducing agent into hematite slag slurry, mixing, and carrying out one-pot reaction at the temperature of more than or equal to 40 DEG C, and then separating to obtain ferrous oxalate with long-strip-shaped morphology. According to the method, the reducing agent is creatively added in the process of leaching the hematite slag through oxalic acid, one-pot synchronous implementation of oxalic acid leaching and reduction crystallization is achieved, further combined control over the temperature and the dosage proportion in the treatment process is matched, synergy can be generated, ferrous oxalate with the special long-strip-shaped morphology can be obtained accidentally, and the method is suitable for industrial production. The reaction channel on the surface of the raw material cannot be blocked, and the forward movement of the one-pot reaction can be promoted.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of hydrometallurgical slag, and in particular relates to a method for synthesizing ferrous oxalate by using hematite slag. Background technique [0002] Hydrometallurgical zinc smelting is the smelting process chosen by most zinc smelting enterprises in my country, and regardless of the conventional method and hot acid iron removal method used in hydrometallurgy zinc smelting, a large amount of zinc-containing leaching slag is accompanied by the production process. However, since the iron in the calcine also enters the solution together with the zinc during hot acid leaching, the iron ions in the zinc solution need to be removed in order to ensure the quality of the zinc solution. At present, iron sinking process can be roughly divided into jarosite method, goethite method and hematite method according to different iron removal methods. Among them, the hematite method has the advan...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C51/42C07C51/43C07C55/07
CPCC07C51/412C07C51/42C07C51/43C07C55/07
Inventor 王云燕朱明飞张文超李彦雨颜旭王庆伟
Owner CENT SOUTH UNIV
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