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

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

Active Publication Date: 2020-04-03
招金矿业股份有限公司蚕庄金矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • 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 using gold extraction waste liquid, comprising the steps of:

[0016] 1) Put the waste liquid after extracting gold and silver to stand, take the supernatant, add hydrochloric acid to adjust the pH to 1, heat and concentrate until precipitation occurs, and then 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 of 600 mesh, add them to the concentrated solution obtained in step 1), control the weight ratio of the concentrated solution and polyamide powder to 5:1, and stir at 40°C While adding calcium formate powder, the amount of calcium formate powder added is twice that of the PA66 powder, stirred and reacted for 5 hours, then left to stand and filtered to obtain a solid reactant;

[0018] 3) Dry the solid reactant obtained in step 2) at 60°C, melt and granulate to obtain PA66 masterbatch;

[0019] 4) Mix ...

Embodiment 2

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

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

[0023] 2) Filter the PA66 powder with a relative viscosity of 2.4, take the particles with a particle size of 400 mesh, add them to the concentrated solution obtained in step 1), control the weight ratio of the concentrated solution and polyamide powder to 10:1, and stir at 50°C While adding calcium formate powder, the amount of calcium formate powder added is 5 times that of PA66 powder, stirred and reacted for 5 hours, then left to stand and filtered to obtain a solid reactant;

[0024] 3) Dry the solid reactant obtained in step 2) at 60°C, melt and granulate to obtain PA66 masterbatch;

[0025] 4) Mix the...

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Abstract

The invention discloses a method for preparing low-crystallinity high-elasticity nylon 66 by utilizing gold extraction waste liquid. The method comprises the following steps of: 1) allowing the wasteliquid after extraction of gold and silver to stand, taking liquid supernatant, adjusting the pH value to be 1-3, and performing heating and concentrating; 2) filtering PA 66 powder though a screen of400-600 meshes, adding the PA 66 powder into a concentrated solution, adding calcium formate powder while stirring at 40-50 DEG C, performing stirring to react for 5 hours, and performing standing and filtering to obtain a solid reactant; 3) drying the solid reactants at 60 DEG C, and carrying out melt granulation to obtain a PA 66 master batch; and 4) mixing the PA 66 master batch with spinninggrade PA66 slices, and carrying out twin-screw rod melt spinning molding to obtain the low-crystallinity high-elasticity nylon 66. The waste liquid with gold and silver extracted from gold ore is concentrated to be saturated and then is prepared together with the PA 66 into the low-crystallinity master batch, hydrogen bonds in molecular chains of the PA 66 are destroyed by utilizing the principlethat calcium ions in the waste liquid are complexed with amide bonds in the molecular chains of the PA 66 under an acidic environment, the crystallinity of the PA 66 is reduced, and then the PA 66 ismixed and spun with the spinning grade PA 66 slices, and the obtained nylon 66 fibers have high elongation at break and high elastic property.

Description

technical field [0001] The invention relates to the reuse of gold smelting waste liquid, in particular to a method for preparing nylon 66 with low crystallinity and high elasticity by using gold extraction 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, among which, besides cyanide method, the gold element and silver element in gold concentrate can be leached successively, and a variety of gold elements can be obtained at the same time. Precious metals, but in the process of extracting gold and silver will add a variety of adjustment aids, the waste liquid contains a large amount of sodium ions and calcium ions, the treatment of waste liquid is often evaporated and concentrated to separate salt and water, but the obtained salt There are fewer uses, and additional economic and environmental burdens will still be generated. [0003] N...

Claims

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Application Information

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Patent Type & Authority Applications(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铭阳
Owner 招金矿业股份有限公司蚕庄金矿
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