Device for preparing lightweight aggregate from semi-hydrated gypsum

Abstract

The utility model discloses a device for preparing lightweight aggregate from semi-hydrated gypsum, which is characterized in that the lower part of a lime hopper is provided with a lime feeding spiral scale, the lower part of the semi-hydrated gypsum hopper is provided with a semi-hydrated gypsum feeding belt scale, and the lime feeding spiral scale and the discharge port of the semi-hydrated gypsum feeding belt scale are communicated with a double-shaft stirring mixer; a cement feeding spiral scale is arranged on the lower portion of the cement hopper, a steel slag feeding spiral scale is arranged on the lower portion of the steel slag hopper, and the lower portions of the double-shaft stirring mixer, the cement feeding spiral scale and the steel slag feeding spiral scale are all communicated with a powder belt. And a discharge port of the drum-type stirrer is sequentially communicated with a feeding belt weigher of the disc granulator and the disc granulator through a conveying mechanism. According to the utility model, the semi-hydrated phosphogypsum is used for directly preparing the lightweight aggregate, so that the resource utilization of the semi-hydrated phosphogypsum is realized.

Description

Technical Field

[0001] The utility model relates to the field of resource utilization of phosphogypsum, in particular to a device for preparing lightweight aggregate from semi-hydrated gypsum. Background Art

[0002] The main ways to utilize phosphogypsum in my country include mine filling, ecological restoration materials, road construction materials, soil conditioners, cement retarders, gypsum-based building materials, sulfuric acid production, chemical fillers, etc. However, due to the high processing costs, uneven quality of gypsum products, and market recognition, the overall utilization rate of phosphogypsum is not high. A large amount of phosphogypsum needs to be stored, which not only occupies a large amount of land resources, but also the phosphorus, sulfur, and fluorine in the phosphogypsum are easily carried by rainwater during rain erosion, causing environmental pollution.

[0003] The hemihydrate phosphoric acid process is not widely used in my country due to factors such as low phosphorus yield and equipment material. Lightweight aggregate made from phosphogypsum is generally made by adding dihydrate phosphogypsum to cementitious materials and then drying it, which has high energy consumption and cost. Summary of the invention

[0004] The purpose of the utility model is to make up for the shortcomings of the prior art and provide a device for preparing lightweight aggregate from hemihydrate gypsum, which directly prepares lightweight aggregate from hemihydrate phosphogypsum and realizes the resource utilization of hemihydrate gypsum.

[0005] The technical solution of this utility model:

[0006] A device for preparing lightweight aggregate with semi-hydrated gypsum comprises a lime hopper, a lime feeding spiral scale is arranged at the bottom of the lime hopper, a semi-hydrated gypsum feeding belt scale is arranged at the bottom of the semi-hydrated gypsum hopper, the lime feeding spiral scale and the semi-hydrated gypsum feeding belt scale are connected, the discharge ports of the lime feeding spiral scale and the semi-hydrated gypsum feeding belt scale are connected to a double-shaft stirring mixer, a cement feeding spiral scale is arranged at the bottom of the cement hopper, a steel slag feeding spiral scale is arranged at the bottom of the steel slag hopper, the lower parts of the double-shaft stirring mixer, the cement feeding spiral scale and the steel slag feeding spiral scale are all connected to a powder belt, the powder belt discharge port is connected to a drum mixer, and the drum mixer discharge port is connected to a disc granulator feeding belt scale and the disc granulator in sequence through a conveying mechanism.

[0007] Preferably, the semi-hydrated gypsum hopper is provided with a loss-in-weight scale for verifying the accuracy of the semi-hydrated gypsum feeding belt scale.

[0008] Preferably, the lime feeding spiral scale, the semi-hydrated gypsum feeding belt scale, the cement feeding spiral scale and the slag feeding spiral scale are all provided with a frequency converter.

[0009] Preferably, the disc granulator is provided with a water atomizing nozzle, and a flow meter and an electric regulating valve are provided on the water pipe.

[0010] Preferably, the discharging port of the disc granulator is connected to a powdering machine via an aggregate belt, a powdering spiral metering scale and a powdering hopper are sequentially arranged above the powdering machine, and a finished product belt is arranged at the discharging port of the powdering machine.

[0011] More preferably, the finished product belt is connected to the curing yard through a conveyor device to meet the residence time required for the semi-crystalline transformation.

[0012] The utility model has the following beneficial effects:

[0013] After being measured, the semi-hydrated gypsum enters the double-shaft stirring mixer 5, and at the same time, after being measured by the spiral scale, the lime 1 also enters the double-shaft stirring mixer for stirring and mixing. The added lime can adjust the pH value of the semi-hydrated gypsum and solidify the water-soluble impurities such as phosphorus and fluorine in the semi-hydrated gypsum. At the same time, the temperature of the semi-hydrated gypsum can be increased during the lime reaction, accelerating the transformation of the crystal form of the semi-hydrated gypsum to the crystal form of the dihydrated gypsum. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] In the figure: lime hopper 1, lime feeding spiral scale 2, semi-hydrated gypsum hopper 3, semi-hydrated gypsum feeding belt scale 4, double-shaft stirring mixer 5, cement hopper 6, cement feeding spiral scale 7, slag hopper 8, slag feeding spiral scale 9, powder belt 10, drum mixer 11, disc granulator feeding belt scale 12, disc granulator 13, aggregate belt 14, powder hopper 15, powder spiral metering scale 16, powder machine 17, finished product belt 18. DETAILED DESCRIPTION

[0016] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Example 1

[0018] A device for preparing lightweight aggregate with semi-hydrated gypsum comprises a lime hopper 1, a lime feeding spiral scale 2 is arranged at the lower part of the lime hopper 1, a semi-hydrated gypsum feeding belt scale 4 is arranged at the lower part of the semi-hydrated gypsum hopper 3, the discharge ports of the lime feeding spiral scale 2 and the semi-hydrated gypsum feeding belt scale 4 are connected with a double-shaft stirring mixer 5, a cement feeding spiral scale 7 is arranged at the lower part of a cement hopper 6, a steel slag feeding spiral scale 9 is arranged at the lower part of a steel slag hopper 8, the lower parts of the double-shaft stirring mixer 5, the cement feeding spiral scale 7 and the steel slag feeding spiral scale 9 are all connected with a powder belt 10, the discharge port of the powder belt 10 is connected with a drum mixer 11, and the discharge port of the drum mixer 11 is connected with a disc granulator feeding belt scale 12 and a disc granulator 13 in sequence through a conveying mechanism.

[0019] Preferably, the semi-hydrated gypsum hopper 3 is provided with a loss-in-weight scale for verifying the accuracy of the semi-hydrated gypsum feeding belt scale 4 .

[0020] Preferably, the lime feeding spiral scale 2, the semi-hydrated gypsum feeding belt scale 4, the cement feeding spiral scale 7 and the slag feeding spiral scale 9 are all provided with frequency converters.

[0021] Preferably, the disc granulator 13 is provided with a water atomizing nozzle, and a flow meter and an electric regulating valve are provided on the water pipe.

[0022] Preferably, the discharge port of the disc granulator 13 is connected to the powdering machine 17 via the aggregate belt 14, a powdering spiral metering scale 16 and a powdering hopper 15 are sequentially arranged above the powdering machine 17, and a finished product belt 18 is arranged at the discharge port of the powdering machine 17.

[0023] More preferably, the finished product belt 18 is connected to the curing yard through a conveying device to meet the residence time required for the semi-crystalline transformation.

[0024] In the preferred solution, the semi-hydrated gypsum feed is measured at two levels, namely, a loss-in-weight scale and a belt scale, so that the feed amount can be compared at any time to reduce the measurement deviation.

[0025] In the preferred solution, the material feed can be self-adjusted. After the material ratio and the hemihydrate gypsum feed amount are set in the DCS system, the feed flow of hemihydrate gypsum, lime, cement and steel slag does not require manual intervention.

[0026] In a preferred embodiment, a twin-shaft stirring mixer is used for premixing of the semi-hydrated gypsum and lime, and a drum mixer is used for mixing the premix with cement and steel slag.

[0027] In a preferred embodiment, the disc granulator rotates clockwise, the powder feeding position is located at the lower right corner of the disc granulator, and the discharge belt is located at the lower left corner of the disc granulator.

[0028] In the preferred solution, the disc granulator is provided with three groups of water atomizing nozzles, which can cover all disc areas. The three groups of water atomizing nozzle main pipes are provided with pressure gauges, and the three groups of branch pipes are respectively provided with electric regulating valves and flow meters.

[0029] The modified hemihydrate gypsum, the measured cement and the steel slag are put into the powder conveyor together and transported to the drum mixer for full mixing. The mixed powder enters the disc granulator for granulation. At the same time, the atomization water volume is adjusted according to the powder feed flow and the material dryness and humidity to control the aggregate particle size and forming rate.

[0030] The semi-finished aggregates from the disc granulator are sent to the powdering machine via a belt conveyor, and powder is added in proportion to avoid agglomeration during the crystal transformation during the curing process. The powdered aggregates are sent to the yard for curing to ensure sufficient time for the crystal transformation, and can be shipped out after 3-4 days of curing.

[0031] The above are only relatively preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preparing lightweight aggregate from hemihydrate gypsum, comprising a lime hopper (1), characterized in that: A lime feeding spiral scale (2) is provided at the bottom of the lime hopper (1), a semi-hydrated gypsum feeding belt scale (4) is provided at the bottom of the semi-hydrated gypsum hopper (3), the discharge ports of the lime feeding spiral scale (2) and the semi-hydrated gypsum feeding belt scale (4) are connected to a double-shaft stirring mixer (5), a cement feeding spiral scale (7) is provided at the bottom of the cement hopper (6), a steel slag feeding spiral scale (9) is provided at the bottom of the steel slag hopper (8), the lower parts of the double-shaft stirring mixer (5), the cement feeding spiral scale (7) and the steel slag feeding spiral scale (9) are all connected to a powder belt (10), the discharge port of the powder belt (10) is connected to a drum mixer (11), and the discharge port of the drum mixer (11) is connected to a disc granulator feeding belt scale (12) and a disc granulator (13) in sequence through a conveying mechanism; The disc granulator (13) is provided with a water atomizing nozzle, and a flow meter and an electric regulating valve are provided on the water pipe of the water atomizing nozzle; The lime feeding spiral scale (2), the semi-hydrated gypsum feeding belt scale (4), the cement feeding spiral scale (7) and the slag feeding spiral scale (9) are all provided with frequency converters.

2. The device for preparing lightweight aggregate using hemihydrate gypsum according to claim 1, characterized in that: The semi-hydrated gypsum hopper (3) is provided with a loss-in-weight scale.

3. The device for preparing lightweight aggregate using hemihydrate gypsum according to claim 1, characterized in that: The material outlet of the disc granulator (13) is connected to the powdering machine (17) via an aggregate belt (14); a powdering spiral metering scale (16) and a powdering hopper (15) are arranged in sequence above the powdering machine (17); and a finished product belt (18) is arranged at the material outlet of the powdering machine (17).

4. The device for preparing lightweight aggregate using hemihydrate gypsum according to claim 3, characterized in that: The finished product belt (18) is connected to the curing yard via a conveying device.

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