Method and device for preparing basic magnesium hypochlorite by using waste chlorine

A technology of magnesium hypochlorite and sodium hypochlorite, which is applied to the equipment for preparing basic magnesium hypochlorite, the preparation of basic magnesium hypochlorite, and the field of production of basic magnesium hypochlorite, which can solve the problems of low yield and achieve the goal of preparing Simple process, stable properties, mild oxidation effect

Inactive Publication Date: 2009-09-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the preparation of basic magnesium hypochlorite generally adopts the magnesium oxide chlorination method or the double decomposition method of magnesium sulfate and calcium hypochlorite, but the yield of these two methods is low, no more than 50%.

Method used

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  • Method and device for preparing basic magnesium hypochlorite by using waste chlorine

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Embodiment 1

[0033] Embodiment 1: utilize the chlorine-containing gas produced in the process of preparing rare earth metal by electrolysis of chloride system molten salt to prepare basic magnesium hypochlorite equipment and technology as follows:

[0034] (1) Equipment

[0035] The present invention prepares the equipment of basic magnesium hypochlorite, comprises air heat exchanger 1, water cooler 2, absorption tower 4, liquid storage tank 5, reactor 8 and centrifuge 10 successively, wherein heat exchanger 1 is connected by pipeline The water cooler 2 is connected to the bottom of the absorption tower 4 through the pipeline and the fan 3; the liquid storage tank 5 is arranged on one side of the absorption tower 4, and the upper part of the liquid storage tank 5 is connected to the liquid absorption tower through the submerged pump 6 and the pipeline. The top of 4 is connected, and the lower part of the liquid storage tank 5 is connected with the reactor 8 through the liquid delivery pump...

Embodiment 2

[0044] Example 2: Using anhydrous magnesium chloride and rare earth chloride as the main raw materials to electrolyze the chlorine-containing gas produced in the process of preparing the rare earth magnesium master alloy to prepare basic magnesium hypochlorite

[0045] (1) Equipment

[0046] Basically the same as embodiment 1, the difference is that two lye absorption towers 4 need to be arranged to ensure that the chlorine content in the tail gas discharged from the top of the absorption tower reaches the discharge standard. When using two or more lye absorption towers, the top of the previous lye absorption tower is connected with the bottom of the next lye absorption tower through a pipeline.

[0047] (2) Process

[0048] In the process of preparing rare earth magnesium master alloy by electrolysis using anhydrous magnesium chloride and rare earth chloride as main raw materials, the electrolysis current is 2000-4000A, the electrolysis temperature is 800-900°C, and 3-6kg of...

Embodiment 3

[0054] Example 3: Preparation of basic magnesium hypochlorite by using partially dehydrated magnesium chloride and partially dehydrated rare earth chloride as the main raw materials to electrolytically prepare the chlorine-containing gas produced in the process of preparing the rare earth magnesium master alloy

[0055] The electrolysis current is 2000-4000A, the electrolysis temperature is 800-900°C, and 3-6kg of chlorine gas is produced per hour.

[0056] The preparation device and the preparation process are the same as in Example 2.

[0057] The available chlorine content in this product is 38.3%, the magnesium content is 29.6%, and the available chlorine yield is 86.2%.

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Abstract

The invention discloses a method for preparing basic magnesium hypochlorite by using waste chlorine. Firstly, chlorine is absorbed by a solution of sodium hydroxide to form a solution of sodium hypochlorite; and secondly, the solution of sodium hypochlorite is reacted with a solution of magnesium chloride to form solid basic magnesium hypochlorite. In the basic magnesium hypochlorite product prepared by the method, the effective chlorine content is 38 to 42 percent, the magnesium content is 28 to 32 percent and the effective chlorine yield is 85 to 95 percent. The method uses chlorine-containing gases produced in the production processes of electrolytic industry or other industries and makes full use of the cheap but high-quality bischofite resources in salt lake areas. The prepared basic magnesium hypochlorite is stable in property and mild in oxidation and can avoid the adverse impact of pinhole damages when used on textiles. The waste liquid produced in the preparation process mainly contains sodium chloride and magnesium chloride and can be directly discharged into salt lakes after simple treatment without adverse impact on the resource structure of the salt lakes.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, relates to a method for preparing basic magnesium hypochlorite, in particular to a method for producing basic magnesium hypochlorite with chlorine gas produced in an electrolysis process or other processes as the main raw material; the present invention At the same time, it also relates to a device for preparing basic magnesium hypochlorite by using waste chlorine gas. Background technique [0002] Basic magnesium hypochlorite (basic magnesium hypochlorite referred to as BMH) is a white powder, hardly soluble in water, the solubility in water is about 0.02%, non-hygroscopic, quite stable in the air, and can be decomposed when heated above 200°C. BMH encounters acid and decomposes to generate new ecological oxygen: [0003] Mg 2 ClO(OH) 3 h 2 O+H + = MgCl 2 +HClO+2H 2 o [0004] HClO=HCl+O (active oxygen) [0005] Therefore, BMH has good disinfection, sterilization and bleaching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/06
Inventor 吴志坚李权葛飞叶秀深卿彬菊刘海宁郭敏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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