Environment-friendly energy-saving normal pressure and temperature wet preparation process for refined bismuth

A wet process and energy-saving technology is applied in the field of environmental protection and energy-saving normal temperature and pressure wet process to prepare refined bismuth. It can solve the problems of complex pharmaceuticals, non-environmental protection, and high cost, and achieve high bismuth ore leaching rate, low cost and environmental protection. The effect of easy operation

Active Publication Date: 2014-01-08
云南业胜环境资源科技有限公司
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AI Technical Summary

Problems solved by technology

Typical ones are: ① ferric chloride leaching - iron powder replacement method; ② ferric chloride leaching - diaphragm electrodeposition method; ③ ferric chloride leaching - hydrolysis bismuth precipitation method; ④ chlorine selective leaching method; ⑤ hydrochloric acid — Nitrous acid leaching method; ⑥ new chlorination hydrolysis method; ⑦ pulp electrolysis method; most of these technological processes have been tested or semi-industrial tests, only the pulp method has been applied to industrial production, and the effect is not ideal
The leaching of bismuth concentrate by the above-mentioned wet treatment adopts medium and high temperature leaching, the reagents are complicated, the cost is high, the process is long and it is not environmentally friendly

Method used

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  • Environment-friendly energy-saving normal pressure and temperature wet preparation process for refined bismuth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The copper-bismuth concentrate is leached under normal temperature and pressure by blowing air into the sodium chloride and hydrochloric acid system.

[0054] Process technical indicators:

[0055] The leaching temperature is at room temperature 25°C, under normal pressure, hydrochloric acid: 90g / L, sodium chloride: 120g / L, liquid-solid ratio 5:1, leaching oxidant is air, leaching time is 4h, basically realizes the complete leaching of Bi, bismuth leaching The yield was 97%, and the pH value of the resulting leachate was 0.5. The composition of the leachate is shown in Table 1-1

[0056] Table 1-1 Leaching liquid composition

[0057] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 36.70 2.19 0.23 2.50 0.65

[0058] It can be seen from Table 1-1 that the Bi in the leaching solution 3+ The content is relatively high. Copper in the solution will affect the electrodeposition extraction of bismuth and product quality, therefore...

Embodiment 2

[0063] The bismuth concentrate is leached under normal temperature and pressure by blowing air into the sodium chloride and hydrochloric acid system.

[0064] Process technical indicators:

[0065] The leaching temperature is at room temperature 29°C, under normal pressure, hydrochloric acid: 100g / L, sodium chloride: 110g / L, liquid-solid ratio 5:1, leaching oxidant is air, leaching time is 4 hours, basically realizes the complete leaching of Bi, bismuth The leaching rate is 97.63%, and the pH value of the resulting leachate is 0.5. The composition of the leachate is shown in Table 2

[0066] Table 2 Leaching solution composition

[0067] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 31.30 0.26 0.15 1.23 0.62

[0068] It can be seen from Table 2 that the Bi in the leaching solution 3+ The content is relatively high, and its leaching solution directly enters the cyclone electrolysis device for electrowinning to produce sponge bism...

Embodiment 3

[0071] Copper-bismuth concentrate is leached under normal temperature and pressure by blowing air into the calcium chloride and hydrochloric acid system.

[0072] Process technical indicators:

[0073] The leaching temperature is at room temperature 20°C, under normal pressure, hydrochloric acid: 140g / L, calcium chloride: 120g / L, liquid-solid ratio 4:1, leaching oxidant is air, leaching time is 4h, basically realizes the complete leaching of Bi, bismuth leaching The yield was 91.32%, and the pH value of the resulting leachate was 0.5. The composition of the leachate is shown in Table 3-1

[0074] Table 3-1 Leaching solution composition

[0075] element Bi 3+ Cu 2+ sn 2+ Zn 2+ Fe 3+ Content (g / L) 15.61 2.67 0.43 3.15 1.06

[0076] It can be seen from Table 3-1 that the Bi in the leaching solution 3+ The content is relatively low, and the copper in the solution will affect the electrodeposition extraction of bismuth and product quality,...

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Abstract

The invention discloses an environment-friendly energy-saving normal pressure and temperature wet preparation process for refined bismuth. The process comprises the procedures of normal temperature leaching, liquid-solid separation, electrodeposition, alkali fusion and electrolysis. The process comprises the following concrete steps: placing bismuth oxide, a bismuth concentrate or a copper-bismuth concentrate in an acidic chlorine salt system at normal temperature and normal pressure, using air or oxygen as an oxidizing agent and carrying out normal temperature leaching; carrying out solid-liquid separation, i.e., directly delivering a leachate to a cyclone electrolyzer at normal temperature and normal pressure, carrying out electrolysis for 1 to 7 h under the conditions that direct voltage and current density are controlled to be 1 to 3.5 V and 150 to 800 A / m<2>, respectively, so as to obtain clear post-electrodeposition liquid and sponge bismuth and returning the post-electrodeposition liquid to the procedure of leaching for cyclic usage; subjecting sponge bismuth obtained in electrodeposition to alkali covering and melting so as to obtain crude bismuth; and allowing the crude bismuth to undergo electrolysis so as to obtain refined bismuth. According to the invention, air or oxygen is used for oxidizing leaching of a bismuth ore in the acidic chlorine salt system at normal temperature and normal pressure, cyclone electrodeposition is adopted to directly extract bismuth from the leachate, so the process can be implemented at normal temperature and normal pressure and has the advantages of simple and convenient operation, high leaching rate of the bismuth ore, low cost and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of smelting and extraction of nonferrous metals, and in particular relates to an environment-friendly and energy-saving normal temperature and pressure wet process for preparing refined bismuth. Background technique [0002] Bismuth is a very rare metal in the earth's crust, ten times less than silver. In nature, it mainly exists in ores in a compound state, and most of them coexist (associate) with metal minerals such as tungsten, molybdenum, lead, tin, and copper, and rarely form deposits that can be mined independently. [0003] Among the heavy non-ferrous metals, bismuth is a low-yield and expensive metal, which needs to be separated and enriched in the 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 cooking smoke. [0004] At room temperature, bismuth does not interact with water ...

Claims

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Application Information

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IPC IPC(8): C25C1/22C22B3/10
CPCY02P10/20
Inventor 方喜方华
Owner 云南业胜环境资源科技有限公司
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