阅读说明：本技术 一种浸出固体镁矿制备氢氧化镁的装置及使用方法 (Device for preparing magnesium hydroxide by leaching solid magnesium ore and use method ) 是由 张旭 于 2018-07-25 设计创作，主要内容包括：本发明公开了一种浸出固体镁矿制备氢氧化镁的装置其特征在于：包括第一反应釜、第二反应釜、第一离心泵、水喷射泵,所述第一反应釜与水喷射泵气体入口处通过导气管连接,所述第二反应釜、第一离心泵、水喷射泵通过导液管依次连接形成闭合回路,水喷射泵在第二反应釜正上方,气液出口端连接第二镁反应釜,第一离心泵液体入口端连接第二反应釜,出口端连接水喷射泵液体入口端。还公开了利用该装置制备氢氧化镁的方法。采用该装置及方法制备氢氧化镁,能高效、清洁制备高纯度氢氧化镁,带来良好的经济效益环境效益。(The invention discloses a device for preparing magnesium hydroxide by leaching solid magnesium ore, which is characterized in that: the device comprises a first reaction kettle, a second reaction kettle, a first centrifugal pump and a water injection pump, wherein the first reaction kettle is connected with a gas inlet of the water injection pump through a gas guide pipe, the second reaction kettle, the first centrifugal pump and the water injection pump are sequentially connected through a liquid guide pipe to form a closed loop, the water injection pump is arranged right above the second reaction kettle, a gas-liquid outlet end is connected with the second magnesium reaction kettle, a liquid inlet end of the first centrifugal pump is connected with the second reaction kettle, and an outlet end is connected with a liquid inlet end of the water injection pump. Also discloses a method for preparing magnesium hydroxide by using the device. The device and the method for preparing the magnesium hydroxide can efficiently and cleanly prepare the high-purity magnesium hydroxide, and bring good economic benefit and environmental benefit.)

1. The device for preparing magnesium hydroxide by leaching solid magnesium ore is characterized in that: including first reation kettle (1), second reation kettle (2), first centrifugal pump (3), water injection pump (4), first reation kettle (1) passes through the air duct with water injection pump (4) gas inlet and is connected, second reation kettle (2), first centrifugal pump (3), water injection pump (4) connect gradually through the catheter and form closed loop, and water injection pump (4) are directly over second reation kettle (2), and second reation kettle (2) are connected to the gas-liquid outlet end, and second reation kettle (2) are connected to first centrifugal pump (3) liquid entry end, and water injection pump (4) liquid entry end is connected to the exit end.

2. The apparatus for leaching solid magnesium ore to prepare magnesium hydroxide according to claim 1, wherein: a condenser pipe (5) is installed near a first reaction kettle end on the gas guide pipe at the gas inlet of the first reaction kettle (1) and the water injection pump (4), and comprises a cylinder body (A), a to-be-condensed gas inlet (B), a condensed gas outlet (C) and a condensate backflow outlet (D), wherein the to-be-condensed gas inlet (B) and the condensate backflow outlet (D) are connected with the first reaction kettle (1), the condensed gas outlet (C) is connected with the gas inlet of the water injection pump (4), and the condensate backflow outlet (D) is connected with a valve.

3. An apparatus for leaching solid magnesium ore to produce magnesium hydroxide as claimed in claim 1 and claim 2, wherein: the device also comprises a second centrifugal pump (6) and a filter cartridge (7), the first reaction kettle (1), the second centrifugal pump (6) and the filter cartridge (7) are sequentially connected through a liquid guide pipe, and the filter cartridge (7) is connected with a gas guide pipe between the condensing pipe (5) and the second reaction kettle (2) through a three-way pipe.

4. A method for leaching solid magnesium ore to produce magnesium hydroxide, using the apparatus of any one of claims 1 to 3, comprising the steps of:

1) a preparation stage, adding a mixture of magnesium mineral and ammonium salt solution into a first reaction kettle (1), and adding soluble magnesium salt solution into a second reaction kettle (2);

2) in the stage of leaching magnesium in the first reaction kettle (1) and preparing magnesium hydroxide in the second reaction kettle (2), the first reaction kettle (1) is heated in a water bath heating mode, the first centrifugal pump (3) is started, magnesium salt is obtained in the first reaction kettle (1), and magnesium hydroxide is obtained in the second reaction kettle (2).

3) And in the stage of discharging magnesium hydroxide and slag, opening a valve to discharge magnesium hydroxide suspension in the second reaction kettle (2), filtering and washing to obtain magnesium hydroxide and ammonium salt solution, starting the second centrifugal pump (6) to convey leached solid and liquid to the filter cylinder (7), starting the first centrifugal pump (3), allowing the magnesium salt solution in the first centrifugal pump (7) to enter the second reaction kettle (2), discharging slag in the filter cylinder (7), and adding ammonium salt and magnesium minerals in the first reaction kettle (1).

4) Repeating the operations 2) and 3), namely entering the process for circularly extracting the magnesium hydroxide, and repeating the steps.

5. The method for leaching solid magnesium ore to prepare magnesium hydroxide according to claim 4, wherein: the magnesium ion solution is one of magnesium sulfate, magnesium chloride or magnesium nitrate, and the magnesium mineral comprises one of light-burned magnesite, calcined boron mud and calcined asbestos tailings.

Technical Field

The invention belongs to the field of inorganic chemical industry, and particularly relates to a reaction device for preparing magnesium hydroxide from solid magnesium ore and a using method of the reaction device.

Background

The magnesium hydroxide is nontoxic and non-corrosive medium and strong alkali, has wide application as a green environment-friendly material in the fields of flame retardants, high-grade ceramics, electronic products, fine chemicals, flue gas desulfurization agents, wastewater treatment and medicines, and is suitable for producing high-added-value products due to good uniformity and high whiteness, so that the magnesium hydroxide has higher competitiveness.

Solid magnesium ore such as magnesite, boron mud and asbestos tailings is used as raw materials to react with ammonium salt to obtain ammonia water and soluble magnesium salt solution, the solution is filtered to remove impurities, and then reacts with the ammonia water to obtain magnesium hydroxide with high purity, and the ammonium salt is recycled. The essence is that valuable components of magnesium oxide react with ammonium salt, the currently adopted method is generally ammonia distillation under normal pressure and high temperature, and the temperature is above 100 ℃, so the method has the following defects: 1) under normal conditions, the reaction of magnesium oxide and ammonium chloride is difficult, the magnesium elution amount is small, the yield is low, and the reaction is slow even if the magnesium oxide is heated to the boiling point of water; 2) a large amount of water is evaporated, the energy consumption is high, the ammonium salt is crystallized due to water evaporation, the solid-liquid ratio of the solution is greatly changed, and the reaction is difficult to continue; 3) in the process, huge ammonia distillation equipment is used, so that the investment is large, and the ammonia distillation equipment is volatile to pollute the production environment and the ecological environment.

Disclosure of Invention

Aiming at the technical defects and imperfections, the invention provides a device for preparing magnesium hydroxide by leaching solid magnesium ore and a using method thereof, which can ensure ammonia sealing, prevent air pollution by volatilization, efficiently recover ammonia and avoid the discharge of ammonia nitrogen wastewater.

The technical scheme adopted by the invention is as follows:

a device for preparing magnesium hydroxide by leaching solid magnesium ore: the device comprises a first reaction kettle, a second reaction kettle, a first centrifugal pump and a water injection pump, wherein the first reaction kettle is connected with a gas inlet of the water injection pump through a gas guide pipe, the second reaction kettle, the first centrifugal pump and the water injection pump are sequentially connected through a liquid guide pipe to form a closed loop, the water injection pump is arranged right above the second reaction kettle, a gas-liquid outlet end is connected with the second reaction kettle, a liquid inlet end of the first centrifugal pump is connected with the second reaction kettle, and an outlet end is connected with a liquid inlet end of the water injection pump.

In the above scheme, be close to first reation kettle end and install the condenser pipe on first reation kettle and the gaseous entrance air duct of water jet pump, the novel nipple rectifier comprises a cylindrical shel, treat the condensing gas entry, the condensing gas export, the condensate backward flow export, treat that condensing gas entry and condensate backward flow export all connect first reation kettle, the gaseous entrance of condensing gas exit linkage water jet pump, the condensate backward flow export is connected with the valve, the condenser pipe is through the backward flow comdenstion water, can reduce greatly that first reation kettle water evaporation gets into in the second reation kettle and crystallization and hindrance reaction appear, the sediment after the washing reaction simultaneously, reduce the loss of smuggleing secretly of soluble salt, maintain the sustainable and go on and the environmental protection of reaction.

In the above scheme, the device still includes second centrifugal pump, cartridge filter, and first reation kettle, second centrifugal pump, cartridge filter connect gradually through the catheter, and the cartridge filter is located the air duct between condenser pipe and second reation kettle through the three-way pipe connection, can guarantee device integration, serialization production, simultaneously because sealed can avoid the volatilization loss of ammonia.

The method for preparing the magnesium hydroxide by leaching the solid magnesium ore is carried out by adopting the device and comprises the following steps:

1) a preparation stage, adding a mixture of magnesium mineral and ammonium salt solution into a first reaction kettle, and adding soluble magnesium salt solution into a second reaction kettle;

2) and in the stage of leaching magnesium in the first reaction kettle and preparing magnesium hydroxide in the second reaction kettle, the first reaction kettle is heated in a water bath heating mode, the first centrifugal pump is started, the magnesium salt is obtained in the first reaction kettle, and the magnesium hydroxide is obtained in the second reaction kettle.

3) And in the stage of discharging magnesium hydroxide and slag, opening a valve to discharge magnesium hydroxide turbid liquid in the second reaction kettle, filtering and washing to obtain magnesium hydroxide and ammonium salt solution, starting a second centrifugal pump to convey leached solid and liquid to a filter cylinder, starting a first centrifugal pump, allowing the magnesium salt solution in the filter cylinder to enter the second magnesium reaction kettle, discharging slag of the filter cylinder, and adding ammonium salt and magnesium minerals in the first reaction kettle.

4) Repeating the operations 2) and 3), namely entering the process for circularly extracting the magnesium hydroxide, and repeating the steps.

In the scheme, the magnesium ion solution is one of magnesium sulfate, magnesium chloride or magnesium nitrate, and the magnesium mineral comprises one of light-burned magnesite, calcined boron mud and calcined asbestos tailings.

The principle of the invention comprises the following reaction formula:

preparation of Mg (OH)₂In the leaching reaction kettle, the material containing magnesium oxide reacts with ammonium solution under the condition of heating and pressure reduction, and is leached to obtain soluble magnesium salt and ammonia gas:

MgO+2NH₄ ⁺＝Mg²⁺+2NH₃↑+H₂O

pumping liquid by a first centrifugal pump, generating negative pressure at one end of a first reaction kettle, and absorbing ammonia gas to obtain magnesium hydroxide;

Mg²⁺+2NH₃+2H₂O＝Mg(OH)₂+2NH₄ ⁺

because the magnesium oxide leaching and the magnesium hydroxide generation are carried out simultaneously, no ammonia accumulation exists, the device has good sealing performance, no ammonia overflow is generated, in addition, the device is simple, the operation is easy, and the purity of the prepared magnesium hydroxide is high.

Drawings

Fig. 1 is an apparatus for leaching solid magnesium ore to prepare magnesium hydroxide according to the present invention.

Fig. 2 is a condenser tube assembly of the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.