CN105441690A

CN105441690A - Method for extracting gold from material liquid with high gold content

Info

Publication number: CN105441690A
Application number: CN201510797459.3A
Authority: CN
Inventors: 潘从明; 谢振山; 李进武; 刘成; 刘世和; 李芬霞
Original assignee: Jinchuan Group Co Ltd
Current assignee: Jinchuan Group Co Ltd
Priority date: 2015-11-18
Filing date: 2015-11-18
Publication date: 2016-03-30

Abstract

The invention provides a method for extracting gold from material liquid with the high gold content. The method comprises the following steps that first, the pH value of a solution is regulated; second, the solution is appropriately heated; third, acid is added into the solution for filtering and separating; fourth, primary coarse gold powder purification is conducted; fifth, the remaining solution is subjected to acidity regulating and extraction; sixth, reverse extraction solid-liquid separation is conducted. Furthermore, a reducing agent adopted in the sixth step is oxalic acid; furthermore, the reducing agent adopted in the sixth step is sodium sulfite; furthermore, zinc powder is added into the remaining tail solution in the sixth step, and platinum group metal can be displaced; furthermore, the method is suitable for waste gold electrolyte and gold chloroazotic acid dissolved solutions.

Description

A kind of method extracting gold from the feed liquid of high Gold Content

Technical field

The present invention relates to technical field of wet metallurgy, specifically a kind of method extracting gold from the feed liquid of high Gold Content.

Background technology

Gold is a kind of important precious metal, because of economic worth and unique physicochemical property such as high temperature resistant, corrosion-resistant of its costliness, and plays important effect in modern economy and industrial production.At present, the production method of gold mainly contains fire refining process, electrolytic process, extraction process and chemical method.Fire refining process raw material is the various solid materialss containing gold, and this method material strong adaptability, equipment are simple, cost is lower, but labour intensity is large, environment is poor, product purity is low, direct yield is low; Electrolytic process raw material is mainly solids crude gold goods, and this method output product purity is high, cost is low, cleanliness of operation, without obnoxious flavour, but the production cycle is grown, direct yield is lower, let funds lie idle; Extraction process is suitable for process low levels gold feed liquid, and operational condition is good, and direct yield is high, but is unsuitable for the material directly processing high-content; Chemical method is with short production cycle, direct yield is high, equipment is simple, material adaptability is comparatively strong, but the golden foreign matter content that primary treatment obtains is higher, and direct yield is difficult to ensure.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of method extracting gold from the feed liquid of high Gold Content, to solve the problem of prior art.

The technical scheme of technical solution problem of the present invention is: a kind of method extracting gold from the feed liquid of high Gold Content, described method comprises the steps.

The first step, reconciles the pH value of solution: by adding the sodium hydroxide solution of 40%, the pH value of solution be adjusted between 1 ~ 2.5.

Second step, mildly heating solution: by between solution warms to 70 ~ 80 DEG C.

3rd step, acid adding filtering separation: add appropriate oxalic acid in the solution of heating, the oxalic acid amount added is 1 ~ 1.5 times that can make to precipitate in solution no longer variable quantity; Add complete reaction filtering separation after 1 ~ 2 hour, be precipitated as once thick bronze and gold-containing solution.

4th step, once thick bronze is purified: the once thick bronze and concentration that filter gained are 20% ~ 30% nitric acid reaction and are filtered, is boiled by the material deionized water filtering gained and wash 24 ~ 48 hours, obtain the bronze of 99.99%.

5th step, remaining solution acidity is reconciled, extraction: reconcile acidity to the 1 ~ 3mol/L of remaining solution in the 3rd step operation with hydrochloric acid till, re-uses dibutyl carbitol (DBC) extraction gold element wherein.

6th step, reextraction solid-liquid separation: add reductive agent in the dibutyl carbitol (DBC) of the 5th step operation gained, after precipitating no longer change in solution, filtering separation, obtains bronze and the tail washings of 99.99%.

Furthermore, described in the 6th step, reductive agent is oxalic acid.

Furthermore, described in the 6th step, reductive agent is S-WAT.

Furthermore, add zinc powder in tail washings remaining in described 6th step, can platinum metals be displaced.

Furthermore, described method is applicable to gold electrolyte, golden aqua regia dissolution liquid.

Beneficial effect of the present invention is: the principle of the inventive method is the reductibility utilizing oxalic acid, under certain pH value and certain temperature, the part gold in high content gold feed liquid is reduced to once thick bronze.Once thick bronze certain density nitric acid and deionized water carry out boiling washing, and finally obtain the qualified bronze of 99.99%.Still containing part gold in filtrate once after reduction, and dibutyl carbitol (DBC) extraction to low levels gold has, and extracting power is strong, selectivity good, stability advantages of higher, therefore adopts it to extract the gold once reduced in the filtrate of rear generation.After back extraction is carried out to extraction liquid, the qualified bronze of output 99.99%.Raffinate zinc dust precipitation, to reclaim platinum metals wherein.Few based on above-mentioned advantage this method reagent dosage known, the cost of material is low, flow process is simple, yield reaches more than 99%; Equipment used is simple, floor space is little, one-time investment is few; This method adaptability to raw material is strong, is particularly suited for the feed liquid processing high content gold.

Accompanying drawing explanation

Fig. 1 is present invention process schema.

Embodiment

Below in conjunction with specific embodiment, the present invention will be further described.

Embodiment 1.

The first step, reconciles the pH value of solution: choose 1L Gold electrolysis liquid, as raw material, add the sodium hydroxide solution 620g of 40% wherein, adjustment pH to 1.5.

Second step, mildly heating solution: by solution warms to 70 DEG C.

3rd step, acid adding filtering separation: add oxalic acid 115g in the solution of heating, react after 1 hour and filters, and is precipitated as once slightly bronze and gold-containing solution.

4th step, once thick bronze is purified: the thick bronze of gained through 20% nitric acid boil wash 24 hours after obtain 99.99% bronze 263.6g.

5th step, remaining solution acidity is reconciled, extraction: utilize hydrochloric acid to reconcile the acidity of remaining solution in the 3rd step operation to 1mol/L, re-use dibutyl carbitol (DBC) extraction gold element wherein.

6th step, reextraction solid-liquid separation: add reductive agent oxalic acid in the dibutyl carbitol (DBC) of the 5th step operation gained, after precipitating no longer change in solution, filtering separation, obtains bronze 11.75g and the tail washings of 99.99%.

7th step, tail washings process: add zinc powder in described tail washings, can displace platinum metals.

Overall reduction and DBC extraction process, the yield of gold is 99.63%.

Embodiment 2.

The first step, reconciles the pH value of solution: choose 100L gold aqua regia dissolution liquid, as raw material, add the sodium hydroxide solution 65.7L of 40% wherein, adjustment pH to 1.5.

Second step, mildly heating solution: by solution warms to 80 DEG C.

3rd step, acid adding filtering separation: add oxalic acid 12.1kg in the solution of heating, reacts after 2 hours and filters.

4th step, once thick bronze is purified: the thick bronze of gained through 30% nitric acid boil wash 48 hours after obtain 99.99% bronze 26397g.

5th step, remaining solution acidity is reconciled, extraction: utilize hydrochloric acid to reconcile the acidity of remaining solution in the 3rd step operation to 3mol/L, re-use dibutyl carbitol (DBC) extraction gold element wherein.

6th step, reextraction solid-liquid separation: add reductive agent S-WAT in the dibutyl carbitol (DBC) of the 5th step operation gained, after precipitating no longer change in solution, filtering separation, obtains bronze 1265g and the tail washings of 99.63%.

Overall reduction and DBC extraction process, the yield of gold is 99.42%.

Embodiment 3.

The first step, reconciles the pH value of solution: choose 10L gold aqua regia dissolution liquid, as raw material, add the sodium hydroxide solution 6.3L of 40% wherein, adjustment pH to 1.5.

Second step, mildly heating solution: by solution warms to 80 DEG C.

3rd step, acid adding filtering separation: add oxalic acid 1.32kg in the solution of heating, reacts after 2 hours and filters.

4th step, once thick bronze is purified: the thick bronze of gained through 30% nitric acid boil wash 48 hours after obtain 99.99% bronze 1567.6g.

5th step, remaining solution acidity is reconciled, extraction: utilize hydrochloric acid to reconcile the acidity of remaining solution in the 3rd step operation to 1mol/L, re-use dibutyl carbitol dibutyl carbitol (DBC) extraction gold element wherein.

6th step, reextraction solid-liquid separation: add reductive agent S-WAT in the DBC of the 5th step operation gained, after precipitating no longer change in solution, filtering separation, obtains bronze 105.3g and the tail washings of 99.63%.

Overall reduction and DBC extraction process, the yield of gold is 99.33%.

Claims

1. from the feed liquid of high Gold Content, extracting a method for gold, it is characterized in that: described method comprises the steps: the first step, reconciling the pH value of solution: by adding the sodium hydroxide solution of 40%, be adjusted between 1 ~ 2.5 by the pH value of solution;

Second step, mildly heating solution: by between solution warms to 70 ~ 80 DEG C;

3rd step, acid adding filtering separation: add appropriate oxalic acid in the solution of heating, the oxalic acid amount added is 1 ~ 1.5 times that can make to precipitate in solution no longer noticeable change amount, adds complete isothermal reaction filtering separation after 1 ~ 2 hour, is precipitated as once thick bronze and gold-containing solution;

4th step, once thick bronze is purified: the once thick bronze and concentration that filter gained are 20% ~ 30% nitric acid reaction and are filtered, is boiled by the material deionized water filtering gained and wash 24 ~ 48 hours, obtain the bronze of 99.99%;

5th step, remaining solution acidity is reconciled, extraction: till in the 3rd step operation, remaining solution adopts hydrochloric acid adjustment acidity to 1 ~ 3mol/L, re-uses dibutyl carbitol (DBC) extraction gold element wherein;

2. a kind of method extracting gold from the feed liquid of high Gold Content according to claim 1, is characterized in that: described reductive agent is oxalic acid.

3. a kind of method extracting gold from the feed liquid of high Gold Content according to claim 1, is characterized in that: described reductive agent is S-WAT.

4. a kind of method extracting gold from the feed liquid of high Gold Content according to Claims 2 or 3, is characterized in that: add zinc powder in tail washings remaining in described 6th step, can displace platinum metals.

5. a kind of method extracting gold from the feed liquid of high Gold Content according to claim 4, is characterized in that: described method is applicable to gold electrolyte, golden aqua regia dissolution liquid.