Method for dearsenization through hot leaching of arsenic alkali residue water

An arsenic alkali residue and leaching technology is applied in the field of waste residue treatment of non-ferrous metal smelting, which can solve the problems of restricting the sustainable development of antimony metallurgy industry, waste of antimony, arsenic, and alkali backlog, safety and environmental pollution, etc. Recovery rate, the effect of reducing the arsenic content

Active Publication Date: 2013-04-24
HUNAN RES INST FOR NONFERROUS METALS +2
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no effective and low-cost method for comprehensive recycling of arsenic-alkali slag. With the continuous increase in inventory, it not only causes a large backlog of antimony, arsenic, and alkali waste, but also increases the risk of safety and environmental pollution, which seriously restricts Sustainable Development of Antimony Metallurgical Industry

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for dearsenization through hot leaching of arsenic alkali residue water
  • Method for dearsenization through hot leaching of arsenic alkali residue water
  • Method for dearsenization through hot leaching of arsenic alkali residue water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: only one hydrothermal leaching

[0042] For a certain arsenic-alkali slag, its composition is shown in Table 1, and the phase composition of arsenic in the arsenic-alkali slag before leaching treatment is shown in Table 2.

[0043] Crush the arsenic-alkali slag to less than 5mm, take 400g of arsenic-alkali slag and carry out hydrothermal leaching under the conditions of 50°C, a solid-to-liquid ratio of 1 / 2, and a leaching time of 90 minutes. Filter the leaching system under heat preservation to separate the leaching liquid from the slag. The leaching residue is leached with 200ml of 50°C hot water to reduce the moisture content of the filtering residue to 42%. The leaching residue is dried at 105°C to measure the leaching The phase composition of arsenic in the slag is shown in Table 2. After the arsenic-alkali slag was leached by hydrothermal treatment once, the arsenic content in the slag was 0.923%, and the leaching rate was 92.82%.

[0044] Table 1 Compo...

Embodiment 2

[0048] Example 2: Twice hydrothermal leaching without adding arsenic removal agent

[0049] Crush the arsenic-alkali slag to less than 5mm, take 300g of arsenic-alkali slag and carry out hydrothermal leaching at 50°C and a solid-to-liquid ratio of 1 / 5 for 60 minutes, and suction-filter the leaching system to separate the leachate from the slag and make the filter slag contain water rate dropped to 37.6%.

[0050] The leaching residue was subjected to the second hydrothermal leaching for 60 minutes under the conditions of leaching temperature of 85°C and solid-to-liquid ratio of 1 / 2. Filter the leaching system to reduce the moisture content of the filter residue to 41.5%, and dry the leaching residue at 105°C. The contents of arsenic and antimony in the arsenic-alkali slag before and after leaching are shown in Table 3. After twice leaching, the arsenic-alkali slag is The arsenic content is 0.53%, and the leaching rate is 95.97%.

Embodiment 3

[0051] Example 3: Twice hydrothermal leaching without adding arsenic removal agent

[0052] Crush the arsenic-alkali slag to less than 5mm, take 400g of arsenic-alkali slag and carry out hydrothermal leaching at 95°C and a solid-to-liquid ratio of 1 / 2 for 60 minutes, and suction filter the leaching system under heat preservation conditions to separate the leachate from the slag. The leached residue was leached with 200ml of hot water at 95°C to reduce the moisture content of the filtered residue to 42.4%.

[0053] Grind the leaching slag to make its particle size less than 0.35 mm (42 mesh), and conduct the second hydrothermal leaching for 120 min at the leaching temperature of 95° C. and the solid-to-liquid ratio of 1 / 5. The leaching system was filtered to reduce the moisture content of the filter residue to 35%, and the leaching residue was dried at 105°C. The contents of arsenic and antimony in the arsenic-alkali slag before and after leaching were shown in Table 3. After t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for dearsenization through hot leaching of arsenic alkali residue water, which comprises the following specific steps: crushing arsenic alkali residue into particle being smaller than 5mm, and then performing first hot leaching with water; filtering and separating the firstly leached mother liquid and residue, and collecting the firstly leached mother liquid to be used for recovering sodium carbonate, sodium arsenate or sodium sulfate and the like; leaching the filter residue, water ratio of the filter residue being reduced to 30%-50%, and leaching the mother solution to be reused as first leaching water; grinding and crushing leached filter residue to particle being less than 0.35mm of particle size (42 mesh), then adding hydrodearsenic catalyst for secondwater hot leaching, after being filtered, the obtained second leached mother solution being reused as first leaching water; and water ratio of the filtered residue being reduced to 30%-50%. With the invention, the leaching rate of arsenic reaches more than 95%, arsenic content of the leached residue is less than 0.5%, the leaching rate of arsenic is improved, arsenic content of the leached residue is reduced, the harmful effect of over-high arsenic content of the leached residue on antimony smelting process is solved, and comprehensive utilization of arsenic alkali residue can be effectively realized.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting waste slag treatment, and in particular relates to a method for removing arsenic by hydrothermal leaching of arsenic-alkali slag. Background technique [0002] Antimony is one of the top ten non-ferrous metals. It occupies a very important position in the national economy and has been widely used in transportation, chemical industry, glass, ceramics, rubber, plastics, machinery manufacturing and military industries. my country is a big resource, production and export country of antimony. There are more than 200 antimony manufacturers, mainly distributed in Hunan, Guangxi, Yunnan and other places. The output of antimony products is about 100,000 tons, accounting for more than 80% of the world. Specific minerals are mined for conservation. [0003] At present, the pyrometallurgical process occupies an absolute advantage in antimony metallurgical production, and more than 95% of the antimony ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B30/04C22B3/04
CPCY02P10/20
Inventor 彭新平陈伟戴永俊万文玉吴思容邓卫华
Owner HUNAN RES INST FOR NONFERROUS METALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap