Leather tanning chromium-containing waste treatment method

A treatment method and waste technology, which is applied in the field of roasting treatment of chromium-containing waste from leather tanning, can solve the problems of high recovery rate, less secondary hazardous waste, and difficult disposal of hazardous waste, and achieve the chromium content of waste residue The effect of reducing toxicity, saving production cost, and reducing chromium content in waste residue

Pending Publication Date: 2021-06-08
丁吉东
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Problems solved by technology

[0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a method for treating chromium-containing waste from leather tanning, which solves the problem that the treatment of hazardous waste from leather tanning is difficult, and realizes the resource utilization of hazardous waste. Recycling, high recovery rate of chromium, less secondary hazardous waste

Method used

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  • Leather tanning chromium-containing waste treatment method

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Embodiment 1

[0033] refer to figure 1 A method for treating chromium-containing waste from leather tanning of the present embodiment includes four sections of pretreatment, roasting, posttreatment and flue gas treatment, and the specific steps are as follows:

[0034] (1) Pretreatment of the raw materials to be processed: (1) Processing of raw chrome leather scraps: pass the raw chrome leather scraps to be processed through a shearing machine, and coarsely crush large pieces of extruded chrome leather scraps to obtain coarsely crushed chrome leather Chips; Drying: Coarsely crushed chrome leather chips are dried with a belt dryer at a temperature of 60-70°C to reduce the moisture content to 13%, and then enter the secondary grinder to be crushed into particles with a particle size of no more than 140 μm. Leather powder, stored in the chrome leather shavings silo; (2) Processing of raw material chrome sludge: Large pieces of chromium sludge are coarsely crushed through a primary crusher to o...

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Abstract

The invention discloses a leather tanning chromium-containing waste treatment method, which aims to solve the problems that hazardous wastes including chromium leather shavings and chromium mud can be generated during leather tanning, a small amount of trivalent chromium is converted into hexavalent chromium due to direct incineration of the chromium leather shavings, the toxicity of waste residues after combustion is increased, the treatment difficulty is increased, the nitrogen content of the chromium leather shavings is high, the nitric oxide content in combustion smoke is high, and the smoke treatment cost is high. The chromium leather shavings and chromium mud are treated through the four working stages of pretreatment, roasting, post-treatment and smoke treatment, the problem existing in landfill after direct incineration or direct landfill of the chromium leather shavings is solved, and recycling of waste resources is achieved,. The leather tanning chromium-containing waste treatment method has good environmental benefits and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment of chromium-containing waste, and in particular relates to a process for roasting chromium-containing waste from leather tanning. Background technique [0002] Chrome tanned leather has excellent properties such as high shrinkage temperature, good softness and plumpness, non-removable tanning after washing, etc., which are incomparable to other single tanning agent tanned leather. Therefore, more than 90% of the leather products on the market, especially light leather, are chrome tanned. Or chrome tanning-based processing. In order to make the finished leather have a uniform thickness, the leather must be shaved after tanning. The shaving operation of chrome tanned leather will produce chromium-containing leather scraps. Shavings are hazardous wastes (HW21-193-002-21), and the resource utilization of shaved chrome leather shavings is imperative. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00F23G5/00F23G5/02F23G5/033F23G5/04F23G5/44F23J15/06F23J15/02F23J15/04F23J15/08B01D53/78B01D53/56B01D53/81B01D53/40B01D53/70
CPCB09B5/00F23G5/006F23G5/02F23G5/033F23G5/04F23G5/444F23J15/06F23J15/02F23J15/04F23J15/08B01D53/78B01D53/56B01D53/81B01D53/40B01D53/70F23G2201/80B01D2257/206B01D2258/0283B01D2251/404B09B3/40Y02W30/20
Inventor 丁吉东
Owner 丁吉东
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