Drinking water-grade calcium aluminate powder and preparation method thereof

Abstract

The invention discloses drinking water grade calcium aluminate powder and a preparation method thereof, and the calcium aluminate powder comprises the following components in parts by weight: 15-18 parts of aluminum oxide, 15-18 parts of ferric oxide, 15-18 parts of calcium oxide, 10-15 parts of polyaluminum chloride, 10-15 parts of polyacrylamide, 10-15 parts of ferrous sulfate, 10-15 parts of aluminum sulfate and 10-15 parts of polyferric sulfate. 20 to 25 parts of iron oxide; 18-30 parts of calcium oxide; 7-12 parts of polyaluminum chloride; 4 to 8 parts of polyacrylamide; 3-7 parts of ferrous sulfate; 5-10 parts of aluminum sulfate; and 9-18 parts of polyferric sulfate. The raw materials are subjected to impurity removal, impurities attached to the surfaces of the raw materials can be removed in advance, the raw materials are dried and smashed, the dryness of the surfaces of the raw materials can be guaranteed in advance, the follow-up grinding difficulty can be lowered, the follow-up grinding efficiency can be improved, and therefore the quality of the raw materials is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of calcium aluminate powder, in particular to drinking water grade calcium aluminate powder and a preparation method thereof. Background Art

[0002] Calcium aluminate powder is a raw material for water purifiers. Its main components are CaO, Al2O3, and Fe2O3. It has strong activity. Using calcium aluminate powder to prepare water purifiers can save a lot of manpower and electricity, and can greatly reduce costs. It also has the advantages of simple process equipment and easy control. Calcium aluminate powder is off-white powder, slightly soluble in water, and its aqueous solution is alkaline with a pH value of about 11. Calcium aluminate powder has a high reaction activity with inorganic strong acids and can start to occur at room temperature. It also releases a large amount of heat and heats up quickly. The dissolution rate of aluminum oxide can reach more than 90%. Using it as a raw material for production Liquid or solid polyaluminium chloride can simplify the process, reduce costs and improve product quality. It is the raw material used by most polyaluminium chloride manufacturers at home and abroad. Calcium aluminate powder is mainly used to produce polyaluminium chloride, aluminium sulfate, sodium aluminate and other aluminium salt products. It can also be used to adjust the alkalinity and can also be used for refractory materials. However, the existing production of calcium aluminate powder is mainly made of high-aluminium bauxite and limestone, which are crushed, dried, ball-milled, and then sintered under high temperature in a rotary kiln, resulting in low yield and poor quality of the calcium aluminate powder produced, which is not conducive to the interests of the enterprise itself. Summary of the invention

[0003] The object of the present invention is to provide drinking water grade calcium aluminate powder and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above purpose, the present invention provides the following technical scheme: drinking water grade calcium aluminate powder, the calcium aluminate powder is composed of aluminum oxide, iron oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate, and the components in parts by weight are: 15-18 parts of aluminum oxide; 20-25 parts of iron oxide; 18-30 parts of calcium oxide; 7-12 parts of polyaluminum chloride; 4-8 parts of polyacrylamide; 3-7 parts of ferrous sulfate; 5-10 parts of aluminum sulfate; and 9-18 parts of polyferric sulfate.

[0005] The preparation method of drinking water grade calcium aluminate powder comprises the following steps:

[0006] A. Impurity removal: Place aluminum oxide, ferric oxide, calcium oxide, polyaluminium chloride, polyacrylamide, ferrous sulfate, aluminium sulfate and polyferric sulfate separately into an impurity removal box for impurity removal;

[0007] B. Drying: The aluminum oxide, ferric oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate after impurity removal are placed in a drying oven for drying;

[0008] C. Crushing: Put the dried aluminum oxide, iron oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate into a crusher according to their weight and crush them;

[0009] D. Calcination: The crushed raw materials are transported to a rotary kiln for calcination at a temperature of 1500-1700°C and a calcination time of 30-60 minutes;

[0010] E. Ball milling: The crushed raw materials are placed in a ball mill for ball milling to obtain drinking water grade calcium aluminate powder, and the particle size of the drinking water grade calcium aluminate powder is 100-200 meshes;

[0011] F. Transportation and storage: The product should be kept dry, waterproof and moisture-proof during transportation and storage. If it clumps when exposed to water, it must be treated before use.

[0012] Preferably, the impurity removal method in step A is carried out by combining a blower and a vibrating screen, and a spring and a vibrating motor are provided at the bottom of the vibrating screen.

[0013] Preferably, the drying method in step B is carried out in combination with a heating device and a stirring device, and the heating device includes a heating plate and a heat conducting plate, the heating plate is arranged at the bottom of the inner cavity of the drying box, the heat conducting plate is arranged at the bottom of the inner cavity of the drying box and is located on the outside of the heating plate, the stirring device includes a motor, a stirring shaft and stirring blades, and the motor is installed at the middle end of the outer side of the drying box, the stirring shaft is fixedly connected to the output shaft of the motor, and the stirring blades are fixedly connected to the outer surface of the stirring shaft, the temperature of the drying box is controlled between 80-120°C, and the drying time is controlled between 1-2h.

[0014] Preferably, the pulverizer in step C is also equipped with a filtering mechanism and a conveying mechanism, the filtering mechanism is a filtering screen cover provided with a screen and a vibration motor, the conveying mechanism is a conveying box provided with spiral conveying blades and a motor, the filtering mechanism filters the pulverized raw materials, and the conveying mechanism conveys the unqualified raw materials into the pulverizer again for secondary or multiple pulverization until they are qualified, and the mesh size of the screen is between 200-800 meshes.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention removes impurities from the raw material surface and dries and pulverizes the raw material to ensure the dryness of the raw material surface and reduce the subsequent grinding difficulty and improve the subsequent grinding efficiency, thereby ensuring the quality of the raw material. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Drinking water grade calcium aluminate powder, calcium aluminate powder is composed of aluminum oxide, iron oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate, and its components in parts by weight are: 15-18 parts of aluminum oxide; 20-25 parts of iron oxide; 18-30 parts of calcium oxide; 7-12 parts of polyaluminum chloride; 4-8 parts of polyacrylamide; 3-7 parts of ferrous sulfate; 5-10 parts of aluminum sulfate; 9-18 parts of polyferric sulfate.

[0019] The preparation method of drinking water grade calcium aluminate powder comprises the following steps:

[0020] A. Impurity removal: Place aluminum oxide, ferric oxide, calcium oxide, polyaluminium chloride, polyacrylamide, ferrous sulfate, aluminium sulfate and polyferric sulfate separately into an impurity removal box for impurity removal;

[0021] B. Drying: The aluminum oxide, ferric oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate after impurity removal are placed in a drying oven for drying;

[0022] C. Crushing: Put the dried aluminum oxide, iron oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate into a crusher according to their weight and crush them;

[0023] D. Calcination: The crushed raw materials are transported to a rotary kiln for calcination at a temperature of 1500-1700°C and a calcination time of 30-60 minutes;

[0024] E. Ball milling: The crushed raw materials are placed in a ball mill for ball milling to obtain drinking water grade calcium aluminate powder, and the particle size of the drinking water grade calcium aluminate powder is 100-200 meshes;

[0025] F. Transportation and storage: The product should be kept dry, waterproof and moisture-proof during transportation and storage. If it clumps when exposed to water, it must be treated before use.

[0026] The impurity removal method in step A uses a blower and a vibrating screen in combination, and a spring and a vibrating motor are provided at the bottom of the vibrating screen.

[0027] The drying method in step B adopts a heating device and a stirring device to cooperate, and the heating device includes a heating plate and a heat conducting plate, the heating plate is arranged at the bottom of the inner cavity of the drying box, the heat conducting plate is arranged at the bottom of the inner cavity of the drying box and is located on the outside of the heating plate, the stirring device includes a motor, a stirring shaft and a stirring blade, and the motor is installed at the middle end of the outer side of the drying box, the stirring shaft is fixedly connected to the output shaft of the motor, and the stirring blade is fixedly connected to the outer surface of the stirring shaft. The temperature of the drying box is controlled between 80-120°C, and the drying time is controlled between 1-2h.

[0028] The pulverizer in step C is also equipped with a filtering mechanism and a conveying mechanism. The filtering mechanism is a filtering screen cover provided with a screen and a vibration motor, and the conveying mechanism is a conveying box provided with spiral conveying blades and a motor. The filtering mechanism filters the pulverized raw materials, and the conveying mechanism conveys the unqualified raw materials into the pulverizer again for secondary or multiple pulverization until they are qualified. At the same time, the mesh number of the screen is between 200-800 meshes.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Drinking water grade calcium aluminate powder, characterized by: Calcium aluminate powder is composed of aluminum oxide, ferric oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate, and its weight proportions are: 15-18 parts of aluminum oxide; 20-25 parts of iron oxide; 18-30 parts of calcium oxide; 7-12 parts of polyaluminium chloride; 4-8 parts of polyacrylamide; 3-7 parts of ferrous sulfate; 5-10 parts of aluminium sulfate; 9-18 parts of polyferric sulfate.

2. A method for preparing drinking water grade calcium aluminate powder, characterized in that: The preparation method comprises the following steps: A. Impurity removal: Place aluminum oxide, ferric oxide, calcium oxide, polyaluminium chloride, polyacrylamide, ferrous sulfate, aluminium sulfate and polyferric sulfate separately into an impurity removal box for impurity removal; B. Drying: The aluminum oxide, ferric oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate after impurity removal are placed in a drying oven for drying; C. Crushing: Put the dried aluminum oxide, iron oxide, calcium oxide, polyaluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate into a crusher according to their weight and crush them; D. Calcination: The crushed raw materials are transported to a rotary kiln for calcination at a temperature of 1500-1700°C and a calcination time of 30-60 minutes; E. Ball milling: The crushed raw materials are placed in a ball mill for ball milling to obtain drinking water grade calcium aluminate powder, and the particle size of the drinking water grade calcium aluminate powder is 100-200 meshes; F. Transportation and storage: The product should be kept dry, waterproof and moisture-proof during transportation and storage. If it clumps when exposed to water, it must be treated before use.

3. The drinking water grade calcium aluminate powder and preparation method thereof according to claim 2, characterized in that: The impurity removal method in step A is carried out by combining a blower and a vibrating screen, and a spring and a vibrating motor are provided at the bottom of the vibrating screen.

4. The drinking water grade calcium aluminate powder and the preparation method thereof according to claim 2, characterized in that: The drying method in step B is carried out in combination with a heating device and a stirring device, and the heating device includes a heating plate and a heat conducting plate, the heating plate is arranged at the bottom of the inner cavity of the drying box, the heat conducting plate is arranged at the bottom of the inner cavity of the drying box and is located on the outside of the heating plate, the stirring device includes a motor, a stirring shaft and stirring blades, and the motor is installed at the middle end of the outer side of the drying box, the stirring shaft is fixedly connected to the output shaft of the motor, and the stirring blades are fixedly connected to the outer surface of the stirring shaft, the temperature of the drying box is controlled between 80-120°C, and the drying time is controlled between 1-2h.

5. The drinking water grade calcium aluminate powder and preparation method thereof according to claim 2, characterized in that: The pulverizer in step C is also equipped with a filtering mechanism and a conveying mechanism. The filtering mechanism is a filtering screen cover with a screen and a vibration motor, and the conveying mechanism is a conveying box with spiral conveying blades and a motor. The filtering mechanism filters the pulverized raw materials, and the conveying mechanism conveys the unqualified raw materials into the pulverizer again for secondary or multiple pulverization until they are qualified. At the same time, the mesh size of the screen is between 200-800 meshes.