A phosphogypsum calciner

Abstract

A phosphogypsum calcining furnace, belonging to the field of phosphogypsum calcining, comprising a flame-throwing furnace, an inner cylinder, a feed port, an outer cylinder, an outer cylinder pushing plate, an inner and outer cylinder connecting piece, an outer cylinder tail end, a cone, and an inner cylinder pushing plate , a pressure equalizing device, and a discharge port; the flame-injecting furnace is a coal-injection furnace or a gas-injecting furnace, installed at the discharge port of the inner cylinder, and its fire direction is located at the discharge end of the inner cylinder; the inner cylinder is arranged on the outer The inside of the cylinder is coaxial with the outer cylinder, and its outer wall is fixedly connected with the outer cylinder through the inner and outer cylinder connectors; the feed inlet is arranged on the outer cylinder, located at one end of the flame-breathing furnace, and runs through the wall thickness of the outer cylinder; The air flow is balanced, the material to be calcined is heated evenly, and the movement of the material to be calcined tends to be smooth, which improves the production efficiency and calcination quality.

Description

Technical field [0001] The present invention belongs to the field of phosphate calcination, and in particular, the present invention relates to a phosphite calciner of a binocular rotary roller using a coal furnace or a gas injection furnace as a heating source. Background technique [0002] Phosphate is a by-product produced by phosphorus chemical enterprises. Due to high moisture content, harmful substances and acidic ions, and main components are dihydrates, therefore, it is not possible to directly apply to other plasters and other applied plasters, resulting in a large amount of accumulation Therefore, it has caused new environmental pollution; for this purpose, the inventors will invent the phosphite is invented to remove harmful substances and acidic ions inventive, so that the phosphorus can be used to solve the phosphorus. Gypsum has a large amount of environmental pollution, and it provides a high strength and water-resistant plaster building material for building const...

AI Technical Summary

Problems solved by technology

[0002] Phosphogypsum is a by-product produced by phosphorus chemical enterprises. Due to its high water content, harmful substances and acid ions, and the main component is dihydrate gypsum, it cannot be directly applied to building construction and other occasions where gypsum is used, causing a large amount of accumulation , so as to cause new environmental pollution; for this reason, the inventor first invented phosphogypsum to remove harmful substances and acid ions through calcination, so that it can be converted into a complex phase hemihydrate gypsum mixture that can be used for building construction, and solve the problem of phosphorus A large amount of gypsum accumulation causes environmental pollution, and at the same time, it provides high-strength and water-resistant gypsum building materials for construction; at present, the calciner used is a rotary kiln-type double-barrel calciner, and the backfire calciner is used. The method is to feed the material at the end of the outer cylinder of the calciner located at the flame-injection furnace. With the rotation of the drum, under the action of the pusher plate, the gypsum powder moves from one end of the flame-injection furnace to the other end, and then moves to the end of the outer cylinder. After entering the inner cylinder through the cone, the gypsum powder moves from the far end of the inner cylinder to the near end of the flame-throwing furnace, and the flame-throwing furnace needs strong wind assistance when spraying fire, so that the heat of the flame can be sprayed to the deep part of the inner cylinder. To achieve the purpose of calcining gypsum; due to the requirements for the flame length of the flame-throwing furnace, the nozzle diameter of the flame-throwing furnace is limited, that is to say, the diameter of the flame-throwing furnace cannot be infinitely enlarged, and the diameter of the inner cylinder is not different from the flame-throwing diameter of the flame-throwing furnace. When it is large, the fire sprayed by the flame-breathing furnace can take into account the overall wind of the inner cylinder section, and at the same time, there is no need to increase the wind pressure of the flame-breathing furnace; It cannot be expanded infinitely, because the flame-breathing effect cannot be formed if the diameter of the flame-breathing furnace exceeds the limit. In order to meet the large-diameter inner tube with large gypsum capacity and high output, it is necessary to increase the fire-breathing wind. Because the mouth of the flame-breathing furnace is small, The flame or hot air flow from the flame-injecting furnace is concentrated in the central area of ​​the inner cylinder section corresponding to the nozzle diameter of the flame-injecting furnace. Therefore, a hot air column will be formed in the central area of ​​the inner cylinder section. Particles, the hot air column can blow these fine particles to the far end of the inner cylinder and then return to the outer cylinder, which cannot ensure smooth entry into the calcination area near the flame-breathing furnace, or stop advancing after entering the calcination area, resulting in over-burning and scrapping. The calcination quality and output of phosphogypsum have a great impact, the result is no material or less material, or the material is burned to death

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