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Recycling method of rinsing liquid in the production process of bleaching powder

A production process and treatment method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as uneven acid quality, environmental pollution, and environmental protection issues , to achieve the effects of strong operability, simple condition control and short processing time

Inactive Publication Date: 2016-08-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if these waste liquids are discharged directly without treatment, it will cause serious environmental pollution and lead to a series of environmental problems.
At present, there is no good solution for pickling liquid. Some enterprises spend tens of millions to import large-scale equipment and machines from abroad for the treatment of acid liquid waste. This method is relatively mature, but the cost is too high and the operation is difficult. The difficulty, coupled with the uneven quality of acid solutions in various companies, it is difficult to use the same set of equipment and the same procedure to solve the problem

Method used

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  • Recycling method of rinsing liquid in the production process of bleaching powder
  • Recycling method of rinsing liquid in the production process of bleaching powder
  • Recycling method of rinsing liquid in the production process of bleaching powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for recycling the rinse solution in the production process of bleaching powder includes the following steps:

[0026] (1) At a temperature of 25-30°C and under stirring conditions, add 5ml of pickling solution to a container containing 50ml (55.35g) of rinse solution to make the pH = 4, stir evenly, and obtain an orange-red viscous shape substance;

[0027] (2) Under the condition of stirring, add 13.5ml pickling solution to make the orange-red viscous substance turn into black liquid;

[0028] (3) Under the condition of stirring, add 200ml rinse solution, make pH=7, the black liquid gradually becomes the liquid containing orange-red particles and chlorine gas is generated, continue to stir for 10min; collect chlorine gas; chlorine gas can be prepared into polymer by conventional technology Ferric chloride products;

[0029] (4) Filter the liquid containing orange-red particles obtained in step (3) to obtain a colorless, clear and transparent neutral liquid...

Embodiment 2

[0032] The method for recycling the rinse solution in the production process of bleaching powder includes the following steps:

[0033] (1) At a temperature of 25-30°C and under stirring conditions, add 4ml of pickling solution to a container containing 50ml (55.35g) of rinse solution to make the pH = 5, stir evenly, and obtain an orange-red viscous shape substance;

[0034] (2) Under the condition of stirring, add 10ml pickling solution to make the orange-red viscous substance turn into a black liquid;

[0035] (3) Under the condition of stirring, add 137ml rinse solution, make pH=7, the black liquid gradually becomes the liquid containing orange-red particles and chlorine gas is generated, continue to stir for 30min; collect chlorine gas; chlorine gas can be prepared into polymer by conventional technology Ferric chloride products;

[0036] (4) Filter the liquid containing orange-red particles obtained in step (3) to obtain a colorless, clear and transparent neutral liquid...

Embodiment 3

[0039] The method for recycling the rinse solution in the production process of bleaching powder includes the following steps:

[0040] (1) At a temperature of 75-80°C and under stirring conditions, add 6.5ml of pickling solution to a container containing 80ml (88.56g) of rinse solution to make the pH = 5, stir evenly, and obtain orange-red viscous shape substance;

[0041] (2) Under the condition of stirring, add 20.5ml pickling solution to make the orange-red viscous substance turn into a black liquid;

[0042] (3) Under the condition of stirring, add 250ml rinse solution, make pH=7.5, the black liquid gradually becomes the liquid containing orange-red particles and chlorine gas is generated, continue to stir for 60min; collect chlorine gas; chlorine gas can be prepared into a polymer by conventional techniques Ferric chloride products;

[0043] (4) Filter the liquid containing orange-red particles obtained in step (3) to obtain a colorless, clear and transparent neutral l...

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Abstract

The invention discloses a method for recycling treatment of a rinsing solution during production of a bleaching powder concentrate. The method comprises the following steps: (1) adding a pickling solution into the rinsing solution at 25-80 DEG C while stirring to ensure that the pH value is equal to 4-5, and stirring uniformly to obtain an orange red sticky substance; (2) adding the pickling solution while stirring to ensure that the orange red sticky substance becomes block liquid; (3) adding the rinsing solution while stirring to ensure that the pH value is equal to 7-7.5 and the black liquid gradually becomes liquid containing orange red particles and generates chlorine, stirring continuously, and collecting chlorine; and (4) filtering the liquid containing the orange red particles to obtain a colorless, clarified and transparent neutral liquid and a red brown filter cake, washing the filter cake, and drying, grinding and firing to obtain iron oxide red. The method disclosed by the invention can be used for treating two types of industrial wastewater, and iron oxide red and chlorine are obtained at the same time, so that the method is green and environment-friendly. The method is short in treatment time, simple to operate, low in energy consumption, and suitable for treatment and production manners under industrial conditions.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic functional materials, in particular to a method for recycling rinse liquid in the production process of bleaching powder concentrate. Background technique [0002] Bleaching powder is high-concentration calcium hypochlorite, and its main component, calcium hypochlorite, has an effective chlorine content of over 70%. It can be used as a high-efficiency bleaching agent for cotton and silk products, and can also be used as a household and industrial disinfectant. Disinfectants and water treatment for swimming pools. Because of its high stability and strong heat resistance, bleaching powder is suitable for long-distance transportation and is widely favored. The production of bleaching powder varies with different raw materials. There are two kinds of products made by passing chlorine gas: calcium method and sodium method. However, no matter which process is used, there will be a by-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G49/06C01B7/01
Inventor 王兴尧陈莉白培锋
Owner TIANJIN UNIV
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