Method for recovering selenium, mercury, gold and silver from acid sludge

A technology for recovering selenium and acid sludge, applied in the field of recovering selenium, gold, silver, and mercury from acid sludge, can solve the problems of low recovery rate of valuable elements, complicated process, affecting product purity, etc., and achieve high added value of products. , the process is short, the effect of low toxicity

Active Publication Date: 2015-07-29
西安西北有色地质研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery of selenium from acid mud has been intensively and extensively studied. Generally, the hydrometallurgical process of "leaching-removal-reduction-multiple purification" is used for recovery, and other studies use the roasting process to prepare SeO 2 , or use the roasting process to change the occurrence state of selenium, and then recover it through the hydrometallurgical process, but the process of the above-mentioned processes is relatively complicated, and the recovery rate of valuable elements is low, and the added value of the product is low. In addition, when the acid mud When the mercury content is high, when the traditional roasting process is used for recovery, it will not only cause the loss of mercury, but also affect the purity of the product

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  • Method for recovering selenium, mercury, gold and silver from acid sludge
  • Method for recovering selenium, mercury, gold and silver from acid sludge

Examples

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Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1, place the 80g acid mud produced in the process of making acid from sulfide ore roasting flue gas in a tube furnace, and carry out roasting treatment under protective atmosphere conditions to produce 6.0g roasting slag and flue gas containing gaseous mercuric selenide; The temperature of the roasting treatment is 560°C, the time is 120min, and the protective atmosphere is a nitrogen atmosphere; the mass content of selenium in the acid mud is 16.28%, the mass content of mercury is 60%, and the mass content of gold is 11.22g / t, the mass content of silver is 366.5g / t;

[0023] Step 2, cooling the flue gas described in step 1, cooling the gaseous mercuric selenide in the flue gas into solid mercuric selenide, realizing the recovery of selenium and mercury in the acid mud; the specific mode of the cooling treatment is: Pass the flue gas into water to cool and precipitate the gaseous mercury selenide in the flue ...

Embodiment 2

[0028] This embodiment includes the following steps:

[0029] Step 1, place the 160g acid mud produced in the acid production process with sulfide ore roasting flue gas in a tube furnace, and carry out roasting treatment under protective atmosphere conditions to produce 12.5g roasted slag and flue gas containing gaseous mercuric selenide; The temperature of the roasting treatment is 580°C, the time is 100min, and the protective atmosphere is an argon atmosphere; the mass content of selenium in the acid mud is 16.28%, the mass content of mercury is 60%, and the mass content of gold is 11.22g / t, the mass content of silver is 366.5g / t;

[0030] Step 2, cooling the flue gas described in step 1, cooling the gaseous mercuric selenide in the flue gas into solid mercuric selenide, realizing the recovery of selenium and mercury in the acid mud; the specific mode of the cooling treatment is: Pass the flue gas into water to cool and precipitate the gaseous mercury selenide in the flue ...

Embodiment 3

[0035] This embodiment includes the following steps:

[0036] Step 1, place 100g of acid mud produced in the process of producing acid from sulfide ore roasting flue gas in a tube furnace, and carry out roasting treatment under protective atmosphere conditions to produce 20g of roasted slag and flue gas containing gaseous mercury selenide; The temperature of roasting treatment is 540 ℃, and the time is 140min, and described protective atmosphere is argon gas atmosphere; The mass content of selenium in the described acid mud is 5.6%, and the mass content of mercury is 15.8%, and the mass content of gold is 4.5g / t, the mass content of silver is 101.7g / t;

[0037]Step 2, cooling the flue gas described in step 1, cooling the gaseous mercuric selenide in the flue gas into solid mercuric selenide, realizing the recovery of selenium and mercury in the acid mud; the specific mode of the cooling treatment is: Pass the flue gas into water to cool and precipitate the gaseous mercury se...

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Abstract

The invention discloses a method for recovering selenium, mercury, gold and silver from acid sludge. The method comprises the steps: (1) putting the acid sludge, generated from a sulfide ore roasting flue gas acid preparing process, into a tubular furnace, and carrying out roasting treatment under the condition of a protective atmosphere, so as to obtain roasting slag and flue gas containing gaseous mercury selenide; (2) cooling the flue gas, so as to cool the gaseous mercury selenide in the flue gas into solid-state mercury selenide and recover selenium and mercury from the acid sludge; (3) extracting gold and silver from the roasting slag obtained in the step (1) by adopting a cyanidation method, so as to recover gold and silver from the acid sludge. According to the method, the solid-state mercury selenide with high added value is obtained by adopting a protective atmosphere roasting process, and gold and silver are recovered by adopting the cyanidation method, so that the method has the advantages of brief flow, high product added value, high purity, high valuable element recovery ratio and little environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of secondary resources, and in particular relates to a method for recovering selenium, mercury, gold and silver from acid mud. Background technique [0002] In order to ensure the quality of sulfuric acid in the process of making acid from sulfide ore roasting flue gas, it is usually necessary to perform dust removal, impurity removal and fog removal on the flue gas generated during the roasting process. , the acid-containing sludge produced in this process is referred to as acid sludge. In the process of high-temperature roasting of sulfide ore, the fine dust and volatile substances in the ore are enriched in the acid mud, resulting in more types of valuable elements in the acid mud (such as: selenium, mercury, gold, silver, lead, etc. ), and the content is relatively high, therefore, it is particularly important to comprehensively recover the valuable elements in the acid mud. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/08C22B1/02C01B19/04
CPCY02P10/20
Inventor 王明马晶马辰王海军
Owner 西安西北有色地质研究院有限公司
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