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A method for extracting and enriching gold in soil

A soil and enrichment technology, which is applied in the direction of improving process efficiency, can solve problems affecting test accuracy and incomplete extraction, and achieve the effects of increasing porosity, improving adsorption efficiency, and increasing contact area

Active Publication Date: 2019-08-09
中煤浙江检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for extracting and enriching gold in soil, which solves the problem that the existing extraction and enrichment method does not extract completely and affects the accuracy of the test, and has the effect of increasing the extraction amount and thereby improving the accuracy of the test

Method used

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  • A method for extracting and enriching gold in soil
  • A method for extracting and enriching gold in soil
  • A method for extracting and enriching gold in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: a kind of preparation method of candle ash modified foamed plastics, comprises the steps:

[0043] A1: Preparation of candle ashes: place the cleaned glass above the burning candle flame to accumulate candle ashes; wait until the candle ashes accumulate to a certain thickness and scrape off the candle ashes with a scraper for later use;

[0044] A2: Put the candle ashes in the crucible, raise the temperature to 200°C at a heating rate of 5°C / min, keep it for 30 minutes, continue to raise the temperature at a heating rate of 5°C / min to 550°C, keep it for 1.5h, cool down to room temperature naturally, and set aside ;

[0045] A3: Weigh raw materials according to the following parts by weight: candle ash in step A2: 4.8 parts; polyether polyol: 22 parts; diisocyanate: 50 parts; water: 3.2 parts; catalyst: 2.0 parts; silicone foam stabilizer: 0.6 part; Wherein, polyether polyol adopts polyether triol 330N, diisocyanate adopts toluene diisocyanate, catalyst is...

Embodiment 2

[0047] Embodiment 2: a kind of preparation method of candle ash modified foamed plastics, comprises the steps:

[0048] A1: Preparation of candle ashes: place the cleaned glass above the burning candle flame to accumulate candle ashes; wait until the candle ashes accumulate to a certain thickness and scrape off the candle ashes with a scraper for later use;

[0049] A2: Put the candle ashes in the crucible, raise the temperature to 200°C at a heating rate of 5°C / min, keep it for 30 minutes, continue to raise the temperature to 550°C at a heating rate of 5°C / min, keep it for 1 hour, cool it down to room temperature naturally, and set aside;

[0050] A3: Weigh raw materials according to the following parts by weight: candle ash in step A2: 4.8 parts; polyether polyol: 22 parts; diisocyanate: 50 parts; water: 3.2 parts; catalyst: 2.0 parts; silicone foam stabilizer: 0.6 part; Wherein, polyether polyol adopts polyether triol 330N, diisocyanate adopts toluene diisocyanate, catalyst...

Embodiment 3

[0052] Embodiment 3: a kind of preparation method of candle ash modified foamed plastics, comprises the steps:

[0053] A1: Preparation of candle ashes: place the cleaned glass above the burning candle flame to accumulate candle ashes; wait until the candle ashes accumulate to a certain thickness and scrape off the candle ashes with a scraper for later use;

[0054] A2: Put the candle ashes in the crucible, raise the temperature to 200°C at a heating rate of 5°C / min, keep it for 30 minutes, continue to raise the temperature to 550°C at a heating rate of 5°C / min, keep it for 2 hours, cool it down to room temperature naturally, and set aside;

[0055] A3: Weigh raw materials according to the following parts by weight: candle ash in step A2: 4.8 parts; polyether polyol: 22 parts; diisocyanate: 50 parts; water: 3.2 parts; catalyst: 2.0 parts; silicone foam stabilizer: 0.6 part; Wherein, polyether polyol adopts polyether triol 330N, diisocyanate adopts toluene diisocyanate, catalys...

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Abstract

The invention discloses an extraction and enrichment method for gold in soil. The extraction and enrichment method includes the following steps that S1, a sample is weighed, fired and cooled to be transferred into a container; S2, 1:1 aqua regia and a 95-120 g / L of Fe3+ solution are added into the container in the step S1, the volume ratio of the aqua regia to the Fe3+ solution is (45-60):1, heating and boiling are carried out for 1.5 h-3 h, heating, evaporation and concentration are carried out until the acidity is 5%-10%, and water is added for diluting the mixture into a primary extractingsolution for standby application; S3, foamed plastic is added into the primary extracting solution obtained in the step S2, and shocking is carried out for 45 min-90 min; S4, the foamed plastic is taken out, water is used for thorough cleaning, and drying is carried out; and S5, the foamed plastic in the step S4 is placed into the container, a thiourea solution with the concentration being 10-12 g / L is added into the container, a limiting device is placed into the container, and therefore the position of the foamed plastic is limited below the liquid level of the thiourea solution, an openingof the container is covered, the container is heated for 30 min to 60 min in a boiling water bath, the foamed plastic is taken out when it is hot, and the constant volume is carried out to obtain a concentration extracting solution. The effects of improving the extracting amount and improving the testing accuracy are achieved.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal treatment, in particular to a method for extracting and enriching gold in soil. Background technique [0002] Soil heavy metal pollution is one of the most serious environmental problems in the world. Generally, the higher the total amount of heavy metals in the soil, the greater the potential harm to the environment. At present, the remediation technology of heavy metal pollution still stays at the technical stage of phytoremediation, supplemented by chemical, microbial and agricultural ecological measures. It is expected to increase the bioavailability of heavy metals, promote the growth and absorption of plants, and thus improve Overall efficiency of phytoremediation. The "system engineering" dominated by phytoremediation is still immature, and there are still technical limitations. Therefore, it is necessary to monitor the heavy metal content in the soil and detect its content. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/06C22B3/16C22B3/24
CPCC22B3/06C22B3/1616C22B3/24C22B11/04Y02P10/20
Inventor 沈国新池伟星王现利
Owner 中煤浙江检测技术有限公司