A method for preparing organic intercalated chromium-containing hydrotalcite nano-tanning agent by utilizing chrome tanning waste liquor

Abstract

The invention discloses a method for preparing an organic intercalated chromium-containing hydrotalcite nano-tanning agent by using chrome tanning waste liquid, which solves the disadvantages of high cost, complicated operation, secondary pollution and the like in the existing chromium reuse method. The technical scheme of the present invention is as follows: a method for preparing an organic intercalated chromium-containing hydrotalcite nano-tanning agent using chrome tanning waste liquid, using organic anions such as citric acid, tartaric acid or itaconic acid as an intercalation agent, using chrome tanning waste liquid Preparation of organic intercalated chromium-containing hydrotalcite nano-tanning agent. The present invention uses the chrome tanning waste liquid which is the most polluted in the tanneries as the raw material to prepare the material for tanning leather, which can effectively treat the chrome tanning waste liquid so that it can be effectively recycled, save chemical raw materials, and reduce the waste water of chrome tanning comprehensive waste water. The processing burden, the tanning performance of the organic intercalated chromium-containing hydrotalcite nano-tanning agent prepared by the present invention meets the standard requirements, and has practical application value.

Description

A kind of method that utilizes chrome tanning waste liquor to prepare organic intercalation chromium-containing hydrotalcite nano-tanning agent technical field The invention belongs to the field of leather tanning agents, be specifically related to a kind of utilizing chrome tanning waste liquor to prepare organic intercalation chrome-containing hydrotalcite Methods for nanotanning agents. Background technique Chrome tanning agent is the commonly used main tanning agent in tanning industry because of its excellent tanning performance, but the absorption rate of chrome tanning method is low, and the waste liquid is polluted. dyeing environment, the composition of chrome tanning waste liquid is complex and contains a large amount of heavy metal Cr 3+ and various inorganic ions and organic acids such as SO 4 2- , Cl ‑ , Na + , K + , formic acid and acetic acid, as well as proteins and animal fats decomposed from skin collagen, etc., are difficult to ha...

AI Technical Summary

Problems solved by technology

[0002] Chrome tanning agent is the main tanning agent commonly used in leather industry because of its excellent tanning performance, but the absorption rate of chrome tanning method is low, the waste liquid pollutes the environment, and the composition of chrome tanning waste liquid is complex, containing a large amount of heavy metal Cr 3+ and various inorganic ions and organic acids, such as SO 4 2- , Cl - 、Na + 、K + , formic acid, acetic acid, etc., as well as proteins decomposed from skin collagen, animal fats, etc., are difficult to handle

my country's leather industry produces about 50-80 million cubic meters of chromium-containing wastewater every year, and the chromium content (in terms of Cr 2 o 3 (calculated) up to 1000-5000mg / L, the existing chromium recycling method has disadvantages such as high cost, complicated operation, secondary pollution, etc.