Carbide slag continuous pulping system

Abstract

The utility model relates to a carbide slag continuous slurrying system which is characterized in that the upper part of a blanking hopper is connected with a water inlet pipe, a discharge port at the bottom of the blanking hopper is connected into an overflow mill through a self-flowing pipe, an overflow port of the overflow mill is connected into a density control tank, a weighing system is arranged below the density control tank, an outlet of the density control tank is connected with a discharge pipe, and the discharge pipe is connected with a slurry tank. An outlet of the slurry tank is connected to the next process through a conveying pump. The system is simple and reasonable in design, and the grid is arranged in the discharging hopper, so that large carbide slag can be prevented from falling to block the system; a partition plate is arranged in the control groove, a high-position overflow mode is adopted, and material sinking and system short circuit can be prevented. The whole system is low in material consumption, easy to control, flexible and convenient to operate and capable of continuously and stably pulping and improving the production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of titanium dioxide production technology and equipment, specifically relating to a continuous slurry preparation system for carbide slag in titanium dioxide production. Technical Background

[0002] In the production of titanium dioxide using the sulfuric acid process, a large amount of acidic wastewater is generated. This acidic wastewater is usually treated by neutralization. Typically, limestone is first used to neutralize it to a pH value of 2-6, followed by the use of quicklime or carbide slag. While adjusting the pH value, this process also removes some iron and other ions from the wastewater. The effective component of both quicklime slurry and carbide slag is calcium hydroxide. Quicklime is expensive, while carbide slag is a waste product from the production of acetylene from calcium carbide, which is inexpensive and highly alkaline. Direct dumping of carbide slag can easily pollute the environment. However, using carbide slag to neutralize the acidic wastewater generated from titanium dioxide production can achieve the effect of "treating waste with waste," reducing environmental pollution, lowering production costs, and enabling resource recycling. When using carbide slag to neutralize wastewater, a large amount of carbide slag is required, necessitating continuous and stable slurry preparation. Furthermore, the high moisture content of carbide slag results in poor flowability and easy clumping after being fed into the hopper, making continuous and stable slurry preparation difficult. This leads to fluctuations in the calcium hydroxide concentration in the slurry, affecting the quality and stability of the neutralized wastewater. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a continuous pulping system for carbide slag.

[0004] To achieve the above objectives, the technical solution of this utility model is: a continuous slurry preparation system for carbide slag, comprising a hopper and an overflow mill, characterized in that: the upper part of the hopper is connected to a water inlet pipe, the bottom outlet of the hopper is connected to the overflow mill through a gravity flow pipe, the overflow outlet of the overflow mill is connected to a density control tank, a weighing system is provided below the density control tank, the outlet of the density control tank is connected to a discharge pipe, the discharge pipe is connected to a slurry tank, and the outlet of the slurry tank is connected to the next process through a conveying pump.

[0005] The inlet pipe is equipped with a flow meter and is connected to the recycled water pipe of the production system. The section of the inlet pipe above the hopper is equipped with multiple high-pressure nozzles for flushing down the carbide slag.

[0006] The hopper is equipped with a grid to prevent large pieces of carbide slag from falling and clogging the system.

[0007] The density control tank is equipped with a baffle plate, the height of which is not less than half the height of the density control tank, and the upper end of the baffle plate is flush with the upper end of the density control tank. The outlet of the density control tank is located at the upper part of the density control tank and adopts a high-level overflow mode to prevent materials from settling to the bottom and the system from short-circuiting.

[0008] The density control tank is connected to a water supply pipe, which is connected to a greywater pipe from the production system.

[0009] The outlet of the density control tank is also connected to a defective material pipe, which is connected to a circulation tank. The outlet of the circulation tank is returned to the feed hopper via a circulation pump. The circulation tank is equipped with an agitator to prevent slurry sedimentation.

[0010] Both the density control tank and the slurry tank are equipped with a stirrer.

[0011] The beneficial effects of this utility model are: the system design is simple and reasonable; by setting a grid in the hopper, large pieces of carbide slag can be prevented from falling and clogging the system; by setting a baffle in the control tank and adopting a high-level overflow mode, material settling to the bottom and system short circuit can be prevented. The entire system consumes few materials, is easy to control, and is flexible and convenient to operate. It can continuously and stably produce pulp, improving production efficiency; it is safe and hygienic, has low energy consumption, is environmentally friendly, and can also reduce labor intensity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention;

[0013] Figure 2 This is a top view of the feeding hopper of this utility model;

[0014] In the diagram: 1-Feeding hopper, 11-Grate, 2-Overflow mill, 3-Density control tank, 31-Baffle plate, 4-Slurry tank, 5-Transfer pump, 6-Circulation tank, 7-Circulation pump, 8-Weighing system, 9-Flow meter, A-Inlet pipe, A1-High-pressure nozzle, B-Water supply pipe, L-Outlet pipe, L1-Unqualified material pipe. Detailed Implementation

[0015] See Figure 1-2 A continuous slurry preparation system for carbide slag includes a hopper 1 and an overflow mill 2. The hopper 1 is characterized by: an inlet pipe A connected to its upper part; a discharge port at the bottom of the hopper 1 connected to the overflow mill 2 via a gravity flow pipe; an overflow port of the overflow mill 2 connected to a density control tank 3; a weighing system 8 installed below the density control tank 3; a discharge pipe L connected to the outlet of the density control tank 3; a slurry tank 4 connected to the outlet of the slurry tank 4 connected to the next process via a conveying pump 5.

[0016] The inlet pipe A is equipped with a flow meter 9 and is connected to the water pipe of the production system. The section of the inlet pipe A above the hopper 1 is equipped with multiple high-pressure nozzles A1 for flushing down the carbide slag.

[0017] The hopper 1 is equipped with a grid 11 to prevent large pieces of carbide slag from falling and clogging the system.

[0018] The density control tank 3 is equipped with a baffle 31. The height of the baffle 31 is not less than half the height of the density control tank 3, and the upper end of the baffle 31 is flush with the upper end of the density control tank 3. The outlet of the density control tank 3 is located at the upper part of the density control tank 3 and adopts a high-level overflow mode to prevent materials from settling to the bottom and the system from short-circuiting.

[0019] The density control tank 3 is connected to a water supply pipe B, which is connected to a recycled water pipe from the production system.

[0020] The outlet of the density control tank 3 is also connected to the unqualified material pipe L1, which is connected to the circulation tank 6. The outlet of the circulation tank 6 is returned to the hopper 1 via the circulation pump 7. The circulation tank 6 is equipped with an agitator to prevent slurry sedimentation.

[0021] Both the density control tank 3 and the slurry tank 4 are equipped with a stirrer.

[0022] Working process: The loader feeds the calcium carbide slag into the feed hopper 1, opens the water inlet pipe A, and through the high-pressure nozzle A1, high-pressure water flushes the calcium carbide slag into the overflow mill 2 via the gravity flow pipe. The feed rate of the overflow mill 2 can be controlled by adjusting the flow rate of the water in the water inlet pipe A. After the overflow mill 2 crushes the coarse particles to a certain fineness, the calcium carbide slag overflows into the density control tank 3 along with the water. The agitator in the density control tank 3 prevents solids from settling to the bottom. The calcium carbide slag slurry overflows from a high position in the density control tank 3 after being deflected by the baffle 31. If the weighing system 8 displays a weight higher than the target value, it indicates that the density of the carbide slag slurry is higher than the control requirement. Open the water supply pipe B to add water until the requirement is met. If the weighing system 8 displays a weight lower than the set value, or the particle size of the carbide slag is unqualified, open the unqualified material pipe L1, and the slurry enters the circulation tank 5, and then returns to the discharge hopper 1 through the circulation pump 7 to re-slurry. When the weighing system 8 displays a weight that is qualified, the density of the carbide slag slurry meets the requirement, and it directly enters the slurry tank 4, and is sent to the user unit through the delivery pump 5.

[0023] Note: When laying out and installing the equipment, the gravity flow pipe of hopper 1 should be as short as possible to prevent blockage; the water pressure should not be lower than 0.45 MPa.

Claims

1. A continuous carbide slag slurry system comprising a hopper (1) and a overflow mill (2), characterized in that: The upper part of the feeding hopper (1) is connected to the water inlet pipe (A), and the bottom outlet of the feeding hopper (1) is connected to the overflow mill (2) through the gravity flow pipe. The overflow outlet of the overflow mill (2) is connected to the density control tank (3). A weighing system (8) is set below the density control tank (3). The outlet of the density control tank (3) is connected to the discharge pipe (L), and the discharge pipe (L) is connected to the slurry tank (4). The outlet of the slurry tank (4) is connected to the next process through the conveying pump (5).

2. A continuous carbide slag slurry system as claimed in claim 1 wherein: The inlet pipe (A) is equipped with a flow meter (9) and is connected to the water pipe of the production system. The section of the inlet pipe (A) above the hopper (1) is equipped with multiple high-pressure nozzles (A1) for flushing carbide slag.

3. A continuous carbide slag slurry system as claimed in claim 1 wherein: The hopper (1) is equipped with a grid (11) to prevent large pieces of carbide slag from falling and clogging the system.

4. A continuous carbide slag slurry system as claimed in claim 1 wherein: The density control tank (3) is equipped with a partition (31). The height of the partition (31) is not less than half the height of the density control tank (3). The upper end of the partition (31) is flush with the upper end of the density control tank (3). The outlet of the density control tank (3) is located at the upper part of the density control tank (3) and adopts a high-level overflow mode to prevent materials from settling to the bottom and the system from short-circuiting.

5. A continuous carbide slag slurry system as claimed in claim 1 wherein: The density control tank (3) is connected to a water supply pipe (B), which is connected to a water supply pipe from the production system.

6. A continuous carbide slag slurry system as claimed in claim 1 wherein: The outlet of the density control tank (3) is also connected to the unqualified material pipe (L1), which is connected to the circulation tank (6). The outlet of the circulation tank (6) is returned to the feed hopper (1) through the circulation pump (7). The circulation tank (6) is equipped with an agitator to prevent slurry deposition.

7. A continuous carbide slag slurry system as claimed in claim 1 wherein: Both the density control tank (3) and the slurry tank (4) are equipped with a stirrer.

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