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A method for preparing low-crystallinity high-elasticity nylon 66 by utilizing gold extraction waste liquid

A low-crystallinity, gold-extracting waste liquid technology, applied in the manufacture of rayon, single-component polyamide rayon, textiles and papermaking, etc., can solve the problems of difficult elements to handle, low elongation at break of nylon 66 fiber, etc. , to achieve the effect of high elongation at break

Active Publication Date: 2022-06-24
招金矿业股份有限公司蚕庄金矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that a large number of elements in the existing gold and silver extraction waste liquid are difficult to handle and the elongation at break of nylon 66 fiber is not high, the present invention provides a method for preparing nylon 66 with low crystallinity and high elasticity by using the gold extraction waste liquid

Method used

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  • A method for preparing low-crystallinity high-elasticity nylon 66 by utilizing gold extraction waste liquid

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Embodiment 1

[0015] A method for preparing low-crystallinity high-elastic nylon 66 by utilizing gold extraction waste liquid, comprising the following steps:

[0016] 1) The waste liquid after extraction of gold and silver is left to stand, take the supernatant, add hydrochloric acid to adjust the pH to 1, heat and concentrate until precipitation occurs and stop, to obtain a concentrated solution;

[0017] 2) Filter the PA66 powder with a relative viscosity of 1.8, take the particles with a particle size between 600 meshes, add it to the concentrated solution obtained in step 1), control the weight ratio of the concentrated solution to the polyamide powder to be 5:1, and stir at 40°C While adding calcium formate powder, the amount of calcium formate powder added is 2 times of that in PA66 powder, stirring and reacting for 5h, and then standing for filtration to obtain a solid reactant;

[0018] 3) drying the solid reactant obtained in step 2) at 60°C, and melting and granulating to obtain ...

Embodiment 2

[0021] A method for preparing low-crystallinity high-elastic nylon 66 by utilizing gold extraction waste liquid, comprising the following steps:

[0022] 1) the waste liquid after the gold and silver extraction is left to stand, take the supernatant, add hydrochloric acid to adjust the pH to 3, heat and concentrate until precipitation occurs and stop, to obtain a concentrated solution;

[0023] 2) Filter the PA66 powder with a relative viscosity of 2.4, take particles with a particle size between 400 meshes, add it to the concentrated solution obtained in step 1), control the weight ratio of the concentrated solution and polyamide powder to be 10:1, and stir at 50°C While adding calcium formate powder, the addition amount of calcium formate powder is 5 times of that in PA66 powder, stirring and reacting for 5h and then standing for filtration to obtain a solid reactant;

[0024] 3) drying the solid reactant obtained in step 2) at 60°C, and melting and granulating to obtain PA6...

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Abstract

The invention discloses a method for preparing nylon 66 with low crystallinity and high elasticity by using gold extraction waste liquid: 1) standing still the waste liquid after extracting gold and silver, taking the supernatant, adjusting the pH to 1-3, heating and concentrating; 2) Filter the PA66 powder at 400-600 mesh, add it to the concentrated solution, add calcium formate powder while stirring at 40-50°C, stir and react for 5 hours, then stand and filter to obtain a solid reactant; 3) Put the solid reactant at 60°C Drying and melt granulation to obtain PA66 masterbatch; 4) Mix PA66 masterbatch with spinning grade PA66 chips, and twin-screw melt spinning to form. In the present invention, the waste liquid after extracting gold and silver from the gold ore is concentrated to saturation, and then mixed with PA66 to prepare low-crystallinity masterbatch, and the principle that the calcium ions in the waste liquid are complexed with the amide bond in the PA66 molecular chain in an acidic environment is used to destroy The hydrogen bonds in the PA66 molecular chain reduce its crystallinity, and then mixed with spinning grade PA66 chips for spinning, the resulting nylon 66 fiber has a high elongation at break and high elastic properties.

Description

technical field [0001] The invention relates to the reuse of gold smelting waste liquid, in particular to a method for preparing low-crystallinity and high-elasticity nylon 66 by using the gold-extracting waste liquid. Background technique [0002] The treatment methods of gold concentrate in gold production mainly include cyanidation method, bacterial oxidation method and hot pressing method. In addition to cyanidation method, the gold and silver elements in the gold concentrate can be leached successively, and various kinds of gold and silver elements can be obtained simultaneously. Precious metals, but in the process of extracting gold and silver, various adjustment aids will be added. The waste liquid contains a large amount of sodium ions and calcium ions. The treatment of waste liquid is often evaporation and concentration to separate salt and water, but the obtained salt Fewer uses still create additional economic and environmental burdens. [0003] Nylon is one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/90D01F1/10
CPCD01F6/90D01F1/10
Inventor 彭剑平刘春江赵显辉闫刚王超张阳阳孙鸣阳
Owner 招金矿业股份有限公司蚕庄金矿
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