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Method for efficiently recycling bismuth from monomer bismuth ore

A high-efficiency, monomeric technology, applied in the field of high-efficiency recovery of bismuth, to achieve high-efficiency selectivity, process simplification, and wide concentration adaptability

Active Publication Date: 2015-07-15
浙江科菲科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to design and provide a technical solution for a method for efficiently recovering bismuth from monomeric bismuth ore. The method has a simple process and solves the problem of introducing new impurities in the process of extracting bismuth from the leaching solution. The purpose of reducing post-processing equipment investment and operating costs is to fundamentally eliminate the increase in the concentration of iron ions in the solution and greatly reduce the output of waste residue. At the same time, the liquid after electrowinning is directly returned to the leaching process, and zero discharge of waste liquid is easily realized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select high-grade bismuth ore from Huaiji, Guangdong, and dry and sample to analyze the main metal element content as follows:

[0027] element Bi Ag Fe Zn co Mg % 0.89 0.60 37.1 0.052 0.03 0.073

[0028] 1) Weigh 1000g of the above bismuth ore and crush it into a 5L beaker, add water at a liquid-solid ratio of 4:1 (ml / l), stir and slurry, add 2.5g of sodium chlorate, and slowly add 70g / L of Leach with hydrochloric acid, control the pH value of the end point to be about 0, and react for 2 hours to obtain a bismuth-containing leachate;

[0029] 2) Filter the bismuth-containing leachate with a precision filter (ceramic membrane precision filter, etc.) to remove solid particle impurities. The filtrate contains bismuth: 2.08g / L, iron: 3.96g / L;

[0030] 3) Inject the leaching solution into the electrowinning circulation tank for swirl electrowinning with a current density of 300A / m 2 , the circulation flow rate is 300 L / h, the electrodep...

Embodiment 2

[0033] Repeat the example 1 leaching operation process to carry out the bismuth ore leaching, the leachate returns and continues to be used for leaching, the acid and the oxidant are still added according to the above-mentioned ratio, and the accumulative enrichment is repeatedly enriched 10 times, and finally obtains a high-concentration bismuth leachate, and the solution contains bismuth: 18.13g / L. Iron content: 24.02g / L; inject the leaching solution into the electrowinning circulation tank for swirl electrowinning. The current density during electrolysis is 500A / m 2 , the circulation flow rate is 600L / h, after continuous electrowinning for 2 hours, the concentration of bismuth in the electrolyte is 5.12g / L, a standard cathode bismuth plate is obtained on the cathode starting plate, and the cumulative recovery rate of bismuth is 97%.

[0034] Current density adopts 550A / m in embodiment 2 2 、600A / m 2 or 700A / m 2 , the circulation flow adopts 500L / h, 550L / h or 580L / h, and ...

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Abstract

The invention discloses a method for efficiently recycling bismuth from monomer bismuth ore and belongs to the technical field of extraction of valuable metal in non-ferrous metal by wet-process metallurgy. The method comprises the following steps of: with the bismuth ore as a raw material, leaching by hydrochloric acid, extracting the bismuth from leaching solution by cyclone electrodeposition, and selectively preparing bismuth powder or a standard cathodic bismuth plate according to different bismuth contents of the leaching solution. The method disclosed by the invention has the advantages that the process is simple, the problem of introduction of new impurities in the bismuth extraction process of the leaching solution is solved, the investment and the operation cost of equipment for aftertreatment are reduced, the increase of the concentration of iron ion in the solution is fundamentally avoided, the yield of waste residue is greatly reduced, simultaneously the electrodeposited liquid returns to the leaching procedure, and zero emission of waste liquid is also easily realized.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal hydrometallurgy valuable metal extraction, and in particular relates to a method for efficiently recovering bismuth from monomeric bismuth ore. Background technique [0002] For bismuth ore with high grade and single composition, pyrometallurgy is still the main method for bismuth smelting, but there is SO 2 pollution problems, and in the face of complex and difficult to select low-grade bismuth concentrates and bismuth medium ores, the reverberatory furnace fire method is used for smelting, which not only has a low recovery rate, but also is difficult to refine to produce high-quality refined bismuth. In the late 1960s, my country began to devote itself to the research of new bismuth ore hydrometallurgy technology. The bismuth ore was leached in an acidic chloride salt system, and the leaching solution was reduced by adding bismuth ore to reduce the ferric iron remaining in the solution...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B3/22C25C1/22C22B30/06
CPCY02W30/54Y02P10/20
Inventor 邓涛佟永明沈李奇门海芬林元吉
Owner 浙江科菲科技股份有限公司
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