Original form dechroming method for chrome leather fragment, and application of product thereof in fertilizer aspect

A technology of chromium leather scraps and morphology, applied in the direction of solid waste removal, etc., can solve problems such as a large amount of chromium leather scraps hydrolysis, and achieve the effects of low hydrolysis rate, low chromium content, and reduced production costs.

Active Publication Date: 2013-06-12
王全杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for dechroming the original form of chrome leather shavings and the application of its products in the production of fertilizers. By designing reasonable process steps and screening suitable process parameters, it is possible to solve the current problem of massive hydrolysis of chrome leather shavings after dechromation question

Method used

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  • Original form dechroming method for chrome leather fragment, and application of product thereof in fertilizer aspect
  • Original form dechroming method for chrome leather fragment, and application of product thereof in fertilizer aspect
  • Original form dechroming method for chrome leather fragment, and application of product thereof in fertilizer aspect

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 50g of chrome leather shavings, 5g of calcium oxide, and 500mL of distilled water. After fully stirring, soak at 30°C for 2 days. During this period, stir frequently to ensure that the chrome leather shavings are fully dispersed; wash and filter, and add 350mL of distilled water and 5g of sodium chloride to the filter residue. , 10g of oxalic acid and 15mL of concentrated sulfuric acid, stir well, dechrome at 25°C for 2h, wash and filter with water; continue to add 350mL of distilled water, 5g of sodium hydroxide alkali and 8g of sodium chloride to the filter residue, and dechrome at 25°C for 40min, Adjusting the pH to neutral, fully washing with water, and filtering; drying the filter residue to obtain the original form of chrome leather shavings dechromed product.

[0023] The drying process adopts a two-step drying method: first, dry at a low temperature at 60-70°C for 3 hours to make the moisture content below 20%; then perform high-temperature drying at a cont...

Embodiment 2

[0026] Weigh 50g of chrome leather shavings, 7g of calcium oxide, and 250mL of distilled water. After fully stirring, soak at 40°C for 1 day. Stir often during this period to ensure that the chrome leather shavings are fully dispersed; wash and filter with water, and add 300mL of distilled water and 6g of sodium chloride to the filter residue. , 15g of oxalic acid and 15mL of concentrated sulfuric acid, stir well, dechrome at 30°C for 3 hours, wash and filter with water; continue to add 250mL of distilled water, 7g of sodium hydroxide and 5g of sodium chloride to the filter residue, heat and dechrome at 20°C for 30min, adjust pH to neutral, fully washed with water, filtered; drying the filter residue to obtain the original form of chrome leather shavings dechromed product.

[0027] The drying process adopts a two-step drying method: first, dry at a low temperature at 60-70°C for 4 hours to make the moisture content below 20%; then perform high-temperature drying at a controlled...

Embodiment 3

[0030] Weigh 50g of chrome leather shavings, 10g of calcium oxide, and 400mL of distilled water. After fully stirring, soak at 20°C for 4 days. During this period, stir frequently to ensure that the chrome leather shavings are fully dispersed; wash and filter, and add 200mL of distilled water and 10g of sodium chloride to the filter residue. , 10g of oxalic acid and 20mL of concentrated sulfuric acid, stir well, dechrome at 20°C for 4 hours, wash and filter with water; continue to add 500mL of distilled water, 10g of magnesium oxide and 10g of sodium chloride to the filter residue, heat at 60°C for 60min after dechrome, adjust the pH to neutral, fully washed with water, and filtered; after drying the filter residue, the original form of chromium leather scraps is obtained.

[0031] The drying process adopts a two-step drying method: firstly, dry at a low temperature at 60-70°C for 5 hours to make the moisture content below 20%; then perform high-temperature drying at a controll...

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Abstract

The invention relates to an original form dechroming method for chrome leather fragment, and application of a product thereof in fertilizer aspect. The method comprises the following steps of: adding water and calcium oxide, soaking at 20-40 DEG C for 1-4 days, washing by water and filtering; adding water, acid and salt into the filter residue, dechroming at 20-30 DEG C for 2-4 hours, washing by water and filtering; continuing to add water, salt and alkaline into the filter residue, keeping the temperature and dechroming for 30-60 min, regulating the pH to be neutral, washing by water and filtering; obtaining an original form dechromed product of chrome leather fragment; mixing and crushing the original form dechromed product of chrome leather fragment with plant ash, pelleting, and thus containing an agricultural composite fertilizer. The composite fertilizer not only has low chrome content and is rich of potassium element and organic nitrogen, but also has certain slow release function, and can effectively promote growth of plants.

Description

technical field [0001] The invention relates to a method for dechroming the original form of chrome leather scraps and the application of the product in fertilizer production. Background technique [0002] After 30 years of rapid development of the leather industry, my country has become a world-recognized leather powerhouse. At the same time, the leather industry has become the third most polluting industry after the paper industry and the brewing industry. It discharges about 8,000 to 12,000 tons of tannery sewage every year. 10,000 tons, 300,000 to 400,000 tons of chromium-containing dander dregs are produced, mainly in the form of chrome leather shavings. Therefore, how to efficiently and reasonably recycle leather shavings has become the focus of the industry. [0003] With the rapid development of my country's agriculture, the varieties of agricultural fertilizers are becoming more and more diversified. From the perspective of regulating soil microorganisms and promoti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C05F15/00
Inventor 王全杰简未平
Owner 王全杰
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