Method for leaching gold hematite wrapped in second-stage calcine through using oxalic acid

A technology of encapsulating gold and hematite, which is applied in the direction of improving process efficiency, can solve problems such as complex operation process, high processing temperature, and large acid consumption, and achieve simple process flow, high iron leaching rate, and improved leaching rate Effect

Inactive Publication Date: 2020-07-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a method for leaching gold-hematite wrapped in the second-stage calcine by using oxalic acid, so as to solve t...

Method used

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  • Method for leaching gold hematite wrapped in second-stage calcine through using oxalic acid
  • Method for leaching gold hematite wrapped in second-stage calcine through using oxalic acid
  • Method for leaching gold hematite wrapped in second-stage calcine through using oxalic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 provides a kind of method that utilizes oxalic acid to leach second-stage calcine and wrap gold hematite, comprise the following steps:

[0034] Step 1, adding oxalic acid in the leaching tank, the molar mass of oxalic acid added is 3.5 times of the total iron molar mass in the second stage calcine to be treated;

[0035] Step 2. Add the second-stage calcined sand and water into the leaching tank with oxalic acid at a liquid-solid ratio of 12mL / 1g, and stir and leaching at 70°C for 5 hours at a stirring speed of 500r / min. After the leaching process, carry out liquid-solid Separation to obtain leaching liquid and leaching slag, wherein, the gold content in the second-stage calcined sand is 57.50g / t, and the hematite content is 25.12%;

[0036] Step 3. Treat the leaching solution in step 2 with static sunlight for 10 hours. After the lighting process, solid-liquid separation is carried out to obtain light yellow solid precipitate and liquid after light. After...

Embodiment 2

[0041] Embodiment 2 provides a kind of method that utilizes oxalic acid to leach the gold-hematite wrapped in the second-stage calcine, comprising the following steps:

[0042] Step 1, adding oxalic acid in the leaching tank, the molar mass of oxalic acid added is 4.5 times of the total iron molar mass in the second-stage calcine to be treated;

[0043] Step 2. Add the second-stage calcined sand and water to the leaching tank with oxalic acid at a liquid-solid ratio of 15mL / 1g, and stir and leaching at 95°C for 3 hours at a stirring speed of 450r / min. After the leaching process, carry out liquid-solid Separation to obtain leaching solution and leaching residue. The weight of the second-stage calcine is 50g, the volume of water is 750mL, the gold content in the second-stage calcine is 47.49g / t, and the hematite content reaches 30.17%;

[0044] Step 3. Divide the leaching solution in step 3 into 6 parts on average, 1 part of the leaching solution is subjected to ultraviolet lig...

Embodiment 3

[0050] Embodiment 3 provides a kind of method that utilizes oxalic acid to leach second-stage calcine and wrap gold hematite, comprise the following steps:

[0051] Step 1, adding oxalic acid into the leaching tank, the molar mass of oxalic acid added is 4.02 times of the total iron molar mass in the second-stage calcine to be treated;

[0052] Step 2. Add the second-stage calcined sand and water into the leaching tank with oxalic acid at a liquid-solid ratio of 14mL / 1g, and stir and leaching at 80°C for 4 hours at a stirring speed of 450r / min. After the leaching process, carry out liquid-solid Separation to obtain leaching solution and leaching slag; among them, the gold content in the second-stage calcine is 50.33g / t, and the hematite content reaches 27.65%;

[0053] Step 3, the leaching solution in step 2 is treated with sunlight static light for 9 hours, and the liquid is subjected to solid-liquid separation after light, to obtain light yellow solid precipitation and liqui...

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Abstract

The invention discloses a method for leaching gold hematite wrapped in second-stage calcine through using oxalic acid. The method comprises the steps that firstly, the oxalic acid is added into a leaching tank; the second-stage calcine and water are added into the leaching tank added with the oxalic acid, agitation leaching is carried out, and liquid-solid separation is carried out after the leaching process is ended so as to obtain a leachate and leaching residues; illumination treatment is carried out on the leachate to obtain a faint yellow precipitate and an illuminated solution; and cyaniding leaching is conducted on the leaching residues, liquid-solid separation is conducted after the leaching process is finished, and accordingly gold-containing pregnant solution is obtained. According to the method, the oxalic acid is added, the strong complexing effect of C2O4<2-> on Fe<3+> is utilized, the hematite in the second-stage calcine is leached in the form of an iron oxalate complex,the iron leaching speed is high, the iron leaching rate is high, the energy consumption in the leaching process is low, and industrialization is easy; the leachate is subjected to illumination treatment to obtain ferrous oxalate, part of the oxalic acid is re-used, and recovering of iron, recycling of part of leaching agent oxalic acid and re-using of the system water are achieved; and cyaniding is conducted on iron removal slag for gold extraction, and the leaching rate of gold is effectively increased.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of metallurgical secondary resources, in particular to a method for leaching gold-hematite wrapped in second-stage calcine by using oxalic acid. Background technique [0002] With the large-scale mining of gold ore resources, the resources of easy-to-process gold ore are gradually depleted, and the research on gold extraction technology of refractory gold ore, especially arsenic-containing gold ore, has attracted more and more attention. More than 1 / 3 of the gold reserves have become an important raw material for gold mine production. Because the gold and arsenopyrite in the arsenic-bearing gold ore are closely symbiotic, the gold exists in the form of fine-grained dissemination in the mineral and belongs to the refractory gold ore, so it is generally pre-oxidized first. At present, the best pretreatment method in the industry is the two-stage roasting method, that is, the first...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B3/04C22B11/08
CPCC22B3/04C22B3/165C22B11/08Y02P10/20
Inventor 党晓娥李林波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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