Unlock instant, AI-driven research and patent intelligence for your innovation.

Chromium-containing inorganic complex chrome-containing tanning agent and preparation method thereof

A chrome tanning agent and inorganic technology, applied in the field of chromium-containing inorganic complex chrome-containing tanning agent and its preparation, can solve the problems of slow sinking speed, complex composition of chrome tanning waste liquid, increase of dissolved chromium, etc.

Active Publication Date: 2017-11-10
XUZHOU HONGFENG HIGH MOLECULAR MATERIAL CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The resulting Cr(OH) 3 Loose structure, high water content, slow sinking speed, difficult to natural filtration and separation of impurities, which brings difficulties to subsequent treatment
[0006] 2) The composition of chrome tanning waste liquid is complex, in fact, a large amount exists in the form of organic complexes, or is compounded by the added concealing agent, or is compounded by the hydrolyzate after collagen pretreatment to form complexes
However, due to the problem of alkali dissolution rate and amphoteric chromium ions in the chrome tanning waste liquor during the alkalization process, the pH of the solution increases, which leads to an increase in dissolved chromium and reduces the flocculation rate of chromium.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chromium-containing inorganic complex chrome-containing tanning agent and preparation method thereof
  • Chromium-containing inorganic complex chrome-containing tanning agent and preparation method thereof
  • Chromium-containing inorganic complex chrome-containing tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] According to the index method of the inorganic complex chrome-containing tanning agent of described self-flocculation, it is characterized in that comprising the following steps in terms of parts by mass:

[0026] 1) In the acid-resistant semi-circular open stainless steel reaction kettle, the calculated amount of water added is 180kg. Then add 98kg concentrated H 2 SO 4 .

[0027] 2) Slowly add 684.3kg Al to the acid solution 2 (SO 4 ) 3 ·6H 2 O, completely miscible. Spray and dry the mixed solution with a particle size of 100-120 mesh.

[0028] 3) Add 284.06kg Na to the above mixed powder 2 SiO 3 ·5H 2 O, heated to 45°C in a stirrer, stirred for 40 minutes, and cooled by cold air for 20 minutes to obtain a mixture with a particle size of 80-100 mesh.

[0029] 4) Add 392.18kg powdered Cr to the above mixed powder 2 (SO 4 ) 3 , mixed and stirred, crushed for 30 minutes, and cooled by cold air to obtain a product with a particle size of 80-100 mesh.

Embodiment approach 2

[0031] 1) In the acid-resistant semicircular open stainless steel reaction kettle, calculate the amount of water added to be 200kg. Then calculated to add 120kgH 2 SO 4 .

[0032] 2) Slowly add 800kg Al to the acid solution 2 (SO 4 ) 3 , are completely miscible. Spray and dry the mixed solution with a particle size of 100-120 mesh.

[0033] 3) Calculate and add 300kg Na to the above powder mixture 2 SiO 3 9H 2 O, heat to 50°C in a stirrer, stir for 40 minutes, cool down and stir for 20 minutes, or a powder mixture with a particle size of 80-100 mesh.

[0034] 4) Add 500kg Cr to the above powder mixture 2 (SO 4 ) 3 , stirred and pulverized for 30-40 minutes, and cooled by cold air to obtain a product with a particle size of 80-100 mesh.

Embodiment approach 3

[0036] 1) In the acid-resistant semicircular open stainless steel reaction kettle, calculate the amount of water added to be 200kg. Then calculated to add 120kgH 2 SO 4 .

[0037] 2) Slowly add 1000kg Al to the acid solution 2 (SO 4 ) 3 , are completely miscible. Spray and dry the mixed solution with a particle size of 100-120 mesh.

[0038] 3) Calculate and add 300kg Na to the above powder mixture 2 SiO 3 9H 2 O, heat to 50°C in a stirrer, stir for 40 minutes, cool down and stir for 20 minutes, or a powder mixture with a particle size of 80-100 mesh.

[0039] 4) Add 700kg Cr to the above powder mixture 2 (SO 4 ) 3 , stirred and pulverized for 30-40 minutes, and cooled by cold air to obtain a product with a particle size of 80-100 mesh.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a chromium-containing inorganic complexing chromium-containing tanning agent. In a common method, an aluminum salt and a chromium salt are compounded together to serve as a chromium-containing tanning agent so as to reduce the usage amount of the chromium salt and improve the absorption of chromium. The chromium-containing inorganic complexing chromium-containing tanning agent provided by the invention is obtained by adding silicate into the two types of metal salts to produce aluminum silicate with the aluminum salt and then form a compound salt with chromium. The wastewater after tanning with chromium sulfate and aluminum silicate is subjected to basification to form macromolecular flocculant silicon-aluminum flocculation molecules so as to perform flocculation on separate chromium salt hydrolyte, an organic chromium salt complex and organic substances. Because a lot of organic acid and protolysate are additionally added into simple chromium tanning wastewater to form a complex with chromium, the alkali resistance is greatly increased.

Description

technical field [0001] The invention relates to the field of light industry technical tanning chemicals, and relates to a chromium-containing inorganic complex chromium-containing tanning agent and a preparation method thereof. Background technique [0002] The chrome tanning method is currently the most mature, most reliable and cost-effective tanning method in the leather industry. 90% globally. The above tanning production is through chrome tanning, and the world's average annual demand for chrome tanning agents reaches 400,000 tons. At present, the chrome tanning process commonly used in tanneries, but the utilization rate of chromium is only 60% to 70%, that is, 30% to 40% of chromium remains in the waste tanning liquor and cannot be absorbed and fixed by raw hides. The concentration reaches 3~8g / L (based on Cr 2 o 3 count). If chromium-containing pollution sources are directly discharged or disposed without recycling, it will not only cause great harm to water bod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06
CPCC14C3/06
Inventor 陈治军单志华吴儒伟龙忠珍
Owner XUZHOU HONGFENG HIGH MOLECULAR MATERIAL CO LTD