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Comprehensive recycling process for polymetallic material containing gold and silver

A multi-metal, gold and silver technology, applied in the direction of improving process efficiency, etc., can solve the problems of low gold and silver direct yield, long process flow, slow capital turnover, etc., and achieve simple process, simple equipment, and reduced consumption Effect

Active Publication Date: 2013-09-04
CHENZHOU YANGTAO CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a comprehensive recovery process for gold and silver-containing multi-metal materials, to separate and recover gold, silver, bismuth, copper, tin, etc. Problems such as long process flow, slow capital turnover, waste gas, and serious waste water pollution

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  • Comprehensive recycling process for polymetallic material containing gold and silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The specific steps of a comprehensive recovery process of a gold-silver-containing polymetallic material are as follows:

[0040] (1) Raw material pretreatment: take 500g of raw material and grind it, which contains bismuth 6.32%, tin 7.58%, copper 8.12%, antimony 6.53%, lead 28.68%, silver 836.26g / t, gold 9.36g / t;

[0041] (2) Primary leaching: add 200 g of sulfuric acid, 100 g of ferric chloride, and 2000 g of water to the raw material; stir and react for 3.5 hours at a temperature of 85-95 °C, and filter to obtain 288.32 g of primary leaching residue; 1953.00 mL of primary leaching solution, of which Bismuth 15.56g / L, copper 19.86 g / L, tin 18.45 g / L;

[0042] (3) Separation of bismuth, copper and tin:

[0043] 3a Add sodium hydroxide to the primary leaching solution to adjust the pH to 2.5, share 57.10 g of sodium hydroxide, and filter to obtain 1898.00 mL of bismuth removal solution, 48.54 g of bismuth oxychloride (including 61.98% of bismuth), and the direct yield...

Embodiment 2

[0053] The specific steps of a comprehensive recovery process of a gold-silver-containing polymetallic material are as follows:

[0054] (1) Raw material pretreatment: take 10kg of raw material and grind it, which contains bismuth 8.62%, tin 28.18%, copper 6.53%, antimony 9.28%, lead 10.06%, silver 8362.48g / t, gold 50.34g / t;

[0055] (2) Primary leaching: add sulfuric acid 4kg, ferric chloride 2kg, and water 40kg to the raw material; stir and react for 3.5 hours at a temperature of 85-95° C. to obtain 4.32kg of primary leaching slag; 39.22L of primary leaching solution, wherein Bismuth 21.31g / L, copper 16.12g / L, tin 69.91g / L;

[0056] (3) Separation of bismuth, copper and tin:

[0057] 3a Add sodium hydroxide to the primary leaching solution to adjust the pH to 2.5, share 1.10 kg of sodium hydroxide, and filter to obtain 37.38 L of bismuth removal solution and 1.23 kg of bismuth oxychloride (including 67.32% of bismuth), and the direct yield of bismuth is 95.99% ;

[0058] ...

Embodiment 3

[0067] The specific steps of a comprehensive recovery process of a gold-silver-containing polymetallic material are as follows:

[0068] (1) Raw material pretreatment: take 10kg of raw material and grind it, which contains bismuth 6.31%, tin 3.14%, copper 10.53%, antimony 12.52%, lead 8.63%, silver 1032.23g / t, gold 89.53g / t;

[0069] (2) Primary leaching: add sulfuric acid 4kg, ferric chloride 2kg, 1 kg hydrochloric acid, and water 40kg to this raw material; filter to obtain primary leaching residue 3.82kg after stirring reaction under the condition of temperature 85-95 ℃ for 3 hours; primary leaching solution 38.68L, including bismuth 15.65g / L, copper 26.13g / L, tin 7.86g / L;

[0070] (3) Separation of bismuth, copper and tin:

[0071] 3a Add sodium hydroxide to the primary leaching solution to adjust the pH to 2.5, share 1.32kg of sodium hydroxide, filter to obtain 37.62L of bismuth removal solution, 0.88kg of bismuth oxychloride (including 68.53% of bismuth), and the direct ...

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Abstract

The invention discloses a comprehensive recycling process for polymetallic material containing gold and silver, belongs to the field of non-ferrous metal comprehensive recovery, and mainly comprises the following steps: ball-milling polymetallic material containing gold and silver, leaching bismuth, copper and tin from the polymetallic material by sulfuric acid leaching agent and ferric chloride, recovering the bismuth, copper and tin; retaining lead, gold and silver in the first leaching residue; and recovering the lead, gold and silver. According to the comprehensive recycling process provided by the invention, bismuth, copper and tin are leached from the polymetallic material by sulfuric acid leaching agent and ferric chloride, the oxidation of the ferric in the ferric chloride, and the chloride solution function of the chloride ion to bismuth and tin are creatively utilized, the addition of sulfuric acid and ferric chloride has the effect of changing silver oxide and silver sulfide into silver chloride, so as to reduce the chlorination step cost, and further reduce the dosage of sodium chlorate and hydrochloric acid, and the leaching rate of gold and silver is greatly improved accordingly. The comprehensive recycling process provided by the invention has the advantages that the technology is simple and practicable, the process is short, the device is simple, and the operation is convenient; and the adopted raw material is common, cheap and pollution free.

Description

technical field [0001] The invention relates to a comprehensive recovery process of gold-silver-containing polymetallic materials, and belongs to the field of comprehensive recovery of non-ferrous metals. Background technique [0002] In the prior art, gold-silver-containing polymetallic materials are usually mixed with materials with high lead content and then fed into blast furnaces or oxygen-enriched system furnaces (such as side-blown furnaces, bottom-blown furnaces, etc.) to be smelted to form lead-containing alloys or crude lead, which are electrolyzed. , anode slime converter smelting and other processes to produce crude silver, and then go through electrolytic silver, gold purification and other processes to obtain gold ingots and silver ingots; in this way, gold and silver can be obtained after multiple fire smelting, and repeated fire smelting will only make the system Many volatile heavy metals such as lead and antimony in the flue gas flow into the flue gas, whic...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/04C22B11/00C22B13/00C22B15/00C22B25/00C22B30/02
CPCY02P10/20
Inventor 张二军肖芬
Owner CHENZHOU YANGTAO CHEM
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