Method for measuring gold in secondary utilization waste

A measurement method and waste technology, which are used in the preparation of test samples, testing metals, material inspection products, etc., can solve the problems of inaccurate measurement methods of heavy metal elements, low recovery rate, waste of resources, etc., and achieve a favorable recovery rate of gold minerals. , Low production cost, the effect of ensuring the leaching rate

Pending Publication Date: 2020-08-25
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a series of problems in the process of recycling and processing. The first is the lack of system design and recycling system, which leads to the extensive state of waste electronic waste in my country, and gradually forms a gray industrial chain of self-employed recycling and small workshop processing, which makes it difficult for formal enterprises to Start of work; then the treatment method is inappropriate and inefficient, and most of them are mechanical crushing and sorting treatment methods, such as rough dismantling, strong acid extraction, random landfill, incineration, discarding and other treatment methods, ignoring the regeneration and harmlessness of resource treatment Chemicalization: Finally, the measurement method of heavy metal elements in the processing process is inaccurate, the recovery rate is low, and the precious secondary utilization resources are seriously lost
[0004] Based on the above data, domestic e-waste has a large base of generation, a low proportion of effective treatment, and there are problems such as improper measurement methods of heavy metal elements in the treatment process, which not only brings about large environmental pollution problems, but also wastes resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking the waste crushed from the circuit board of the washing machine as a sample, the gold grade of the raw material is 30.58g / t, and the specific steps are as follows:

[0033] 1) The crushed raw waste sample is ground to -0.074mm and the content accounts for 62%;

[0034] 2) Proportioning dilute hydrochloric acid extractant concentration 4.8mol / L;

[0035] 3) get 2g tin protochloride, 10ml concentration is that the dilute hydrochloric acid of 4.8mol / L is mixed as tin protochloride solution;

[0036] 4) The amount of hydrochloric acid extractant, the solid-liquid ratio between the solid mass added by the waste material and the volume added by the dilute hydrochloric acid extractant is 1:10, g / ml, the relative ratio increases, the amount of stannous chloride reducing agent, according to the waste material The solid-to-liquid ratio between the added mass and the added volume of stannous chloride reducing agent is 10:0.25, g / ml, and the relative ratio increases; the le...

Embodiment 2

[0041] Taking the crushed waste of mobile phone circuit boards as a sample, the raw material gold grade is 38.24g / t, and the specific steps are as follows:

[0042] 1) The crushed raw waste sample is ground to -0.074mm and the content accounts for 70%;

[0043] 2) Proportioning hydrochloric acid concentration 5.4mol / L;

[0044] 3) get 2g stannous chloride, 10ml concentration is that the dilute hydrochloric acid of 5.4mol / L is mixed as tin protochloride solution;

[0045] 4) The amount of hydrochloric acid extractant, the solid-liquid ratio between the solid mass added by the waste material and the volume added by the dilute hydrochloric acid extractant is 1:15, g / ml, the relative ratio increases, the amount of stannous chloride reducing agent, according to the waste material The solid-liquid ratio between the added mass and the added volume of the stannous chloride reducing agent is 10:0.30, g / ml, and the relative ratio increases. The leaching reaction time is 2.5h, the wate...

Embodiment 3

[0050]Taking the crushed waste of computer circuit boards as a sample, the gold grade of the raw material is 44.61g / t, which specifically includes the following steps:

[0051] 1) The crushed raw waste sample is ground to -0.074mm and the content accounts for 80%;

[0052] 2) Proportioning hydrochloric acid concentration 6mol / L;

[0053] 3) get 2g tin protochloride, 10ml concentration is that the dilute hydrochloric acid of 6mol / L is mixed as tin protochloride solution; 4) hydrochloric acid extractant consumption, the solid mass that adds by waste and the volume that hydrochloric acid extractant adds The liquid ratio is 1:20, g / ml, and the relative ratio increases. The dosage of the stannous chloride reducing agent is 10:0.35, g / ml according to the solid-liquid ratio between the quality added by the waste material and the volume added by the stannous chloride reducing agent, and the relative ratio increases. The leaching reaction time is 3h, the water bath heating temperatur...

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Abstract

The invention relates to a method for measuring gold in secondary utilization waste, and belongs to the technical field of solid waste comprehensive utilization. The method comprises the steps of waste preparation, preparation of diluted hydrochloric acid extracting agent, stannous chloride and diluted hydrochloric acid are mixed to prepare a reducing agent; mixing the waste material with a diluted hydrochloric acid extracting agent and then carrying out leaching reaction; synchronously adding a stannous chloride solution reducing agent; the method comprises the following steps: taking gold-containing waste leachate, heating in a water bath, mixing the gold-containing waste leachate with a cyanide-free agent or an environment-friendly agent or an iodine-potassium iodide gold leaching solution, carrying out a leaching reaction, synchronously introducing micro-nano bubbles in the cyanide-free or environment-friendly leaching reaction to obtain gold-free waste leachate subjected to the leaching reaction, and calculating the leaching rate of gold according to a test result. The method has the advantages that the natural solubility of jarosite and stannate is brought into full play, andthe recovery rate of gold minerals is increased; a small amount of stannous chloride mixed solution is added as a reducing agent, the reaction is more sufficient and thorough through water bath heating, the leaching rate of gold minerals is ensured, and the gold recovery rate is high.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, in particular to a method for measuring gold in secondary utilization waste. Background technique [0002] With the gradual acceleration of the renewal rate of electronic products in society, the rate of generation of secondary utilization resources such as electronic waste is also gradually increasing. Based on relevant survey information from domestic social and environmental management departments: the amount of electronic waste generated in China every year accounts for 60.17% of social waste. Scientists have discovered that there are astonishing reserves of "gold mines" in these electronic wastes, and their resources are no less than the gold obtained by mining. It is reported that if the disposal method is proper, 50 pounds of gold and 20,000 pounds of copper can be extracted from one million discarded mobile phones, which is a very considerable resource fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N33/20
CPCG01N1/28G01N33/20
Inventor 马东梅郝福来张世镖
Owner CHANGCHUN GOLD RES INST
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