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A method for preparing iron red and recovering silver from alumite slag

A technology of jarosite slag and iron red, which is applied in the field of comprehensive recovery of hydrometallurgy, and can solve the problems of high energy consumption of jarosite slag, long-term stacking treatment of jarosite slag to pollute the environment, and insufficient recycling of valuable metals and iron resources. and other problems, to achieve the effect of high acidity and improved leaching rate

Active Publication Date: 2017-08-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large energy consumption for the traditional treatment of jarosite slag, high load requirements for metallurgical equipment, long-term stacking of jarosite slag to pollute the environment, inadequate recycling of valuable metals and iron resources, etc., to provide a A method with simple process flow, high comprehensive recovery rate of metals, and the efficient recovery of iron and silver metals from alum slag to the greatest extent

Method used

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  • A method for preparing iron red and recovering silver from alumite slag
  • A method for preparing iron red and recovering silver from alumite slag
  • A method for preparing iron red and recovering silver from alumite slag

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Effect test

Embodiment 1

[0030] The zinc-ferrosite slag from a Chifeng smelter in Inner Mongolia was used as the raw material, and its elemental composition is shown in Table 1.

[0031] Table 1 Main element composition of raw materials

[0032] element Fe Zn Pb Cu Cd Ag Content w / % 25.9 3.6 1.7 0.22 0.097 518.5 element S mn Si acid As Na K Content w / % 10.1 0.92 1.3 0.77 0.61 0.23

[0033] Note: The unit of silver content is g / t

[0034] (1) Weigh 400g of alumina slag, according to the volume / mass ratio (mL / g) 2:1, the amount of sulfuric acid is 1.5 times of the theoretical amount, react at a temperature of 60°C for 2h, filter to obtain hot acid leaching filtrate and hot Acid leaching slag;

[0035] (2) The hot acid leaching solution is replaced by iron powder to remove copper, sulfide to remove lead, cadmium, arsenic, H 2 o 2 Oxidation, to obtain a purification solution, the purification solution contains 88.5g / L of iron;

[0036] (3...

Embodiment 2

[0041] The zinc-ferrosite slag from a Chifeng smelter in Inner Mongolia was used as the raw material, and its elemental composition is shown in Table 1.

[0042] (1) Take by weighing 400g of vitriol slag, according to the volume / mass ratio (mL / g) 4:1, the amount of sulfuric acid is 1.0 times of the theoretical amount, react at a temperature of 80°C for 4h, filter to obtain hot acid leaching filtrate and Hot acid leaching residue;

[0043] (2) The hot acid leaching solution is replaced by iron powder to remove copper, sulfide to remove lead, cadmium, arsenic, H 2 o 2 Oxidation, to obtain a purification solution, the purification solution contains 103.0g / L of iron;

[0044] (3) The purification liquid is adjusted to PH to 1.5 by lime milk, 1.5 times the theoretical amount of urea is added, and the reaction time is 2 hours at a temperature of 180° C. to obtain the product iron red;

[0045] (4) The hot acid leaching slag was obtained under the conditions of a liquid-solid rati...

Embodiment 3

[0049] The zinc-ferrosite slag from a Chifeng smelter in Inner Mongolia was used as the raw material, and its elemental composition is shown in Table 1.

[0050] (1) Take by weighing 400g of vitriol slag, according to the volume / mass ratio (mL / g) 6:1, the amount of sulfuric acid is 1.8 times of the theoretical amount, react at a temperature of 100°C for 1h, filter to obtain hot acid leaching filtrate and Hot acid leaching residue;

[0051] (2) The hot acid leaching solution is replaced by iron powder to remove copper, sulfide to remove lead, cadmium, arsenic, H 2 o 2 Oxidation, to obtain a purification solution, the purification solution contains 118.6g / L of iron;

[0052] (3) The purified solution is neutralized with milk of lime to adjust the pH to 0.5, add urea twice the theoretical amount, and react for 3 hours at a temperature of 220° C. to obtain the product iron red;

[0053] (4) Reacting the hot acid leaching residue at a liquid-solid ratio (mL / g) of 12:1, a thioure...

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Abstract

The invention discloses a method for preparing iron oxide red and recycling silver through ferroalumen residues. The method comprises the steps of leaching the ferroalumen residues through hot acid, removing impurities through leaching liquid, directly preparing iron oxide red through a hydrothermal method and extracting silver through hot-acid leaching residues. According to the step of leaching the ferroalumen residues through hot acid, leaching is carried out for 1-4 h at the temperature of 60-100 DEG C, and hot-acid leaching liquid and the hot-acid leaching residues are obtained. According to the step of removing impurities through the leaching liquid, iron powder replacement for copper removing is carried out, lead, cadmium and arsenic are removed through vulcanization, H2O2 oxidization is carried out, and purification liquid is obtained. According to the step of directly preparing iron oxide red through the hydrothermal method, an additive is added into the purification liquid, a reaction is carried out for 0.5-3 h at the temperature of 120-150 DEG C, and the product of iron oxide red is obtained. According to the step of extracting silver through the hot-acid leaching residues, silver leaching and silver-enriched liquid impurity removing are carried out, and a reaction is carried out for 2-4 h at the temperature of 40-100 DEG C in silver leaching. During preparing of iron oxide red, the iron settling rate is higher than 93%, the silver recycling rate is higher than 94%, and the purity of iron oxide red is higher than 97%. The method is simple in technical process and high in comprehensive metal recycling rate, and efficient recycling of iron and silver in the ferroalumen residues is achieved to the largest degree.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery of hydrometallurgy, and in particular relates to a method for preparing iron red and recovering silver from jarosite slag. Background technique [0002] The jarosite iron-vanadium method is widely used in the zinc hydrometallurgy process to deposit iron. The process is simple. The iron-vanadium is a crystal, which is easy to concentrate, filter, and wash. The filtration speed is fast and the zinc loss with the slag is low. Due to the low iron content in the bauxite slag, on the one hand, it is difficult to meet the requirements of the ironmaking industry; on the other hand, the content of impurity elements Zn, Cu, Cd, Pb, Sn, As, Sb, etc. precious metals such as Au and Ag. If the huge amount of jarosite waste residue is not taken appropriate measures to deal with and effectively utilize, it will not only occupy land resources, waste mineral resources, but the most important thing is that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/04C01G49/06
CPCC01G49/06C22B11/044Y02P10/20
Inventor 何静杨建平杨声海王夏阳夏新兵郭路路陈永明
Owner CENT SOUTH UNIV
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