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Method for producing basic chromic sulfate by utilizing tannery waste chromium mud

A technology of chromium sulfate and chromium mud, applied in the directions of chromium sulfate, chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of environmental pollution, waste of energy, etc., and achieves the solution of chromium pollution, easy content control, significant economic benefits and high efficiency. The effect of social benefit

Active Publication Date: 2017-01-11
菏泽泓泽贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is: according to the technical problems that the current waste chrome sludge cannot be effectively treated to cause environmental pollution and waste of energy, the present invention provides a method for producing basic chromium sulfate by using tanning waste chromium sludge

Method used

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Effect test

Embodiment 1

[0032] The present invention utilizes tannery waste chrome mud to produce the method for basic chromium sulfate, and the detailed steps of this production method are as follows:

[0033] a, at first the tanning waste chromium mud is carried out cool and dry, the mass percentage composition of water in the chrome mud after cool and sun is 36%; Then carry out drying (the waste heat that adopts roasting process to produce is dried), the gained chromium after drying The mass percent composition of water in the mud is 8%;

[0034] B, the chromium mud after step a drying is mixed with sodium hydroxide (the mass percentage composition of sodium hydroxide is 80%), and the weight ratio between chrome mud and sodium hydroxide is 1:33, Put into batch type rotary kiln after mixing, and add oxidant sodium nitrate (sodium nitrate is an industrial product, its mass percentage content is 98%), the addition of sodium nitrate accounts for 4% of the chromium mud weight after drying, then heat ;...

Embodiment 2

[0039] The present invention utilizes tannery waste chrome mud to produce the method for basic chromium sulfate, and the detailed steps of this production method are as follows:

[0040] a, at first carry out cool drying to tanning waste chrome mud, the mass percentage composition of water in the chrome mud after cooling is 30%; Then carry out drying (the waste heat that adopts roasting process to produce is dried), the gained chromium after drying The mass percent composition of water in the mud is 5%;

[0041] B, the chromium mud after step a drying is mixed with sodium hydroxide (the mass percentage composition of sodium hydroxide is 60%), and the weight ratio between chrome mud and sodium hydroxide is 1:35, Put into batch type rotary kiln after mixing, and add oxidant sodium nitrate (sodium nitrate is an industrial product, its mass percentage content is 98%), the addition of sodium nitrate accounts for 3% of the chrome mud weight after drying, then heat ; First, heat up ...

Embodiment 3

[0046] The present invention utilizes tannery waste chrome mud to produce the method for basic chromium sulfate, and the detailed steps of this production method are as follows:

[0047] a, at first carry out cool drying to tanning waste chrome mud, the mass percentage composition of water in the chrome mud after cooling is 40%; Then carry out drying (the waste heat that adopts roasting process to produce is dried), the gained chromium after drying The mass percent composition of water in the mud is 10%;

[0048] B, the chromium mud after step a drying is mixed with sodium hydroxide (the mass percentage composition of sodium hydroxide is 98%), and the weight ratio between chrome mud and sodium hydroxide is 1:30, Put into batch type rotary kiln after mixing, and add oxidant sodium nitrate (sodium nitrate is an industrial product, its mass percentage content is 98%), the addition of sodium nitrate accounts for 5% of the chromium mud weight after drying, then heat ;Firstly, heat...

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Abstract

The invention discloses a method for producing basic chromic sulfate by utilizing tannery waste chromium mud. The method comprises the following steps: airing and drying waste chromium mud, uniformly mixing the dried chromium mud and sodium hydroxide in a rotary kiln, and adding an oxidant for roasting; performing water circulation suction filtration washing on the roasted materials, and removing impurities, thereby obtaining a sodium chromate solution; adding sulfuric acid into the obtained solution for reacting, thereby obtaining sodium dichromate; continuously adding sulfuric acid for reacting, slowly adding cane sugar, and reacting, thereby obtaining liquid basic chromic sulfate; and finally, drying the basic chromic sulfate solution, thereby obtaining the powdered basic chromic sulfate. According to the technical scheme of the invention, the waste chromium mud is fully utilized, and changed into valuable things to be recycled, and the resources and the energy are saved. The problem of chromium pollution in tannery industry is solved, and the tannery cost can be reduced. The chromium pollution is solved, and meanwhile, the economic benefits and social benefits of enterprises are obviously improved.

Description

[0001] 1. Technical field: [0002] The invention relates to a preparation method of basic chromium sulfate, in particular to a method for producing basic chromium sulfate by utilizing tanning waste chromium mud. [0003] 2. Background technology: [0004] Chrome tanning is a key process in the leather manufacturing process. Since the chromium is not completely absorbed by the collagen fibers during the tanning process, the utilization rate of the chrome tanning solution is only about 70%, and the remaining 30% of the chrome tanning solution is not used. And into the waste water, on the one hand, it has caused serious pollution to the environment, and on the other hand, it has also caused a great waste of resources. [0005] At present, the most common method for treating chrome tanning wastewater is the alkali-adding precipitation method, which is to add a certain amount of alkaline substances to the waste liquid to make the chromium ions form chromium hydroxide, and then filt...

Claims

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Application Information

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IPC IPC(8): C01G37/08C01G37/033
CPCC01G37/033C01G37/08C01P2006/80
Inventor 张晓东
Owner 菏泽泓泽贸易有限公司
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