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Method for recovering bismuth and arsenic from bismuth and arsenic-containing solution

A technology of solution and alkaline solution, which is applied in the field of recycling bismuth and arsenic, can solve the problems of bismuth recovery rate decline and bismuth loss, and achieve the effect of improving recovery rate and avoiding loss

Inactive Publication Date: 2012-08-29
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

Studies have shown that only when the arsenic content is relatively low, the bismuth in the solution can be hydrolyzed to form BiOCl, and when the arsenic content in the solution is relatively high, the solution must first be de-arsenized before the bismuth is deposited. Causes the loss of bismuth and reduces the recovery rate of bismuth in the whole process

Method used

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  • Method for recovering bismuth and arsenic from bismuth and arsenic-containing solution
  • Method for recovering bismuth and arsenic from bismuth and arsenic-containing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The leach solution obtained by leaching a metallurgical slag with sulfuric acid mainly contains As: 14.72g / L; Bi: 14.28g / L; Cu: 6.78g / L; Fe: 3.11g / L; Pb: 2.17g / L; L.

[0030] While mechanically stirring, adjust the pH value of the solution to about 0.5 with 15% (mass concentration, the same below) ammonia water, keep mechanically stirring for 30 minutes, and filter with suction to obtain a precipitate and a filtrate. The filtrate was sampled and analyzed, and the precipitation rate of each element calculated according to the filtrate composition was As 24%, Bi 3.3%, Cu 3.2%, Fe 2.8%, Pb 36%, Sb 85%.

[0031] Continue to use 15% ammonia water to adjust the pH value of the filtrate to 3.2, maintain mechanical stirring for 30 minutes, and filter with suction to obtain a precipitate and a filtrate. XRD analysis of the obtained precipitate revealed that it was mainly bismuth arsenate. According to the filtrate sampling analysis, the precipitation rates of bismuth and arsen...

Embodiment 2

[0036] The composition and operation process of the leaching solution used are the same as in Example 1, except that the pH value of the solution is adjusted to 0 with 15% ammonia water, and the precipitation rate of each element analyzed after filtration is As 16.2%, Bi 3.3%, Cu 3.2%, Fe 2.2 %, Pb 27.5%, Sb 78.9%.

[0037] Continue to use 15% ammonia water to adjust the pH value of the filtrate to 3.5, keep mechanical stirring for 30 minutes, and filter with suction to obtain a precipitate and a filtrate. XRD analysis of the obtained precipitate revealed that it was mainly bismuth arsenate. According to the filtrate sampling analysis, the precipitation rates of bismuth and arsenic in the solution are all over 98%.

[0038]Use 4mol / L sodium hydroxide solution to carry out alkali leaching treatment on the above precipitate, and stir and leaching for 1 hour under the conditions of liquid-solid ratio of 3:1 and temperature of 90°C. After liquid-solid separation, the leaching so...

Embodiment 3

[0042] The composition and operation process of the leaching solution used are the same as in Example 1, except that the pH value of the solution is adjusted to 0.8 with 15% ammonia water, and the precipitation rate of each element analyzed after filtration is As 33.2%, Bi 4.2%, Cu 4.2%, Fe 3.5 %, Pb 44.2%, Sb 88.9%.

[0043] Continue to use 15% ammonia water to adjust the pH value of the filtrate to 3.5, keep mechanical stirring for 30 minutes, and filter with suction to obtain a precipitate and a filtrate. XRD analysis of the obtained precipitate revealed that it was mainly bismuth arsenate. According to the filtrate sampling analysis, the precipitation rates of bismuth and arsenic in the solution are all over 98%.

[0044] Use 1 mol / L sodium hydroxide solution to carry out alkali leaching treatment on the above precipitate, and stir and leaching for 1 hour under the conditions of liquid-solid ratio of 6:1 and temperature of 70°C. After liquid-solid separation, the leachin...

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Abstract

The invention discloses a method for recovering bismuth and arsenic from a bismuth and arsenic-containing solution. The method is characterized by comprising the steps as follows: adjusting the pH value of the bismuth and arsenic-containing solution to be in a certain range so as to deposit out the bismuth and the arsenic in the solution in a form of bismuth arsenate; processing the obtained bismuth arsenate deposit by a strong base solution to effectively separate the arsenic from the bismuth; and respectively recovering the bismuth and the arsenic from a basic leached residue and a basic leached solution. According to the method, the solution does not need to be subjected to arsenic removal before the bismuth deposition of the leached solution containing higher arsenic and bismuth, so that the bismuth loss in the arsenic removal process is avoided to increase the recovery rate of the bismuth in the solution; the arsenic and the bismuth in the solution are co-deposited in the form of the bismuth arsenate, and the purpose of effectively separating the arsenic from the bismuth is achieved by the basic leached bismuth arsenate deposit according to the characteristic that the arsenate deposit easily acts with strong base and is converted into soluble arsenate and insoluble metal oxide or hydroxide; the arsenic is recovered in a form of sodium arsenate while the bismuth is recovered; and due to small bismuth loss in the arsenic and bismuth co-deposition and bismuth arsenate base leaching processes, the total recovery rate of the bismuth in the whole process is guaranteed to be not less than 90%.

Description

technical field [0001] The invention discloses a method for recovering bismuth and arsenic from a solution containing arsenic and bismuth. It belongs to the technical field of resource recovery. technical background [0002] Bismuth is a rare metal. Most bismuth minerals are symbiotic with metal minerals such as tungsten, molybdenum, lead, tin, and copper, and rarely form deposits with independent mining value. Therefore, it is necessary to separate bismuth concentrate during the beneficiation process of other main metals. In addition, bismuth also often enters the by-products of other main metal refining processes, such as lead anode slime, copper smelting and blowing smoke, etc. Bismuth is therefore usually recycled as a by-product during the production of metals such as copper, lead, and zinc. [0003] When bismuth is recovered from anode slime or various smelting fumes, hydrometallurgical technology is usually used, that is, bismuth enters the solution phase through ac...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B30/04C22B30/06C22B3/46C22B3/12
CPCY02P10/20
Inventor 陈亚廖婷陈白珍石西昌徐徽杨喜云
Owner CENT SOUTH UNIV
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