Sintering shaft kiln of phosphate pellets

Abstract

The invention discloses a sintering shaft kiln of phosphate pellets, consisting of a kiln body, a hearth, a furnace door and an annular reverberatory furnace. The invention is characterized in that the annular reverberatory furnace which surrounds the kiln body and supplies a heat energy to the upper part of an inner cavity of the shaft kiln from outside to inside is manufactured on the upper part of the kiln body; the annular reverberatory furnace consists of eight combustion furnace cavities which are uniformly built by refractory bricks; a flaming opening of the annular reverberatory furnace is arranged outside the kiln body; a combustion-supporting air pipe which supplies a channel to a combustion-supporting air path and a gas pipe which supplies a gas source to the annular reverberatory furnace for burning are arranged on an outer wall of a cavity body. As the annular reverberatory furnace is manufactured on the upper part of the shaft kiln, a tail gas which is with the temperature of 200 to 300 DGR C and is generated in a sintering production process of the pellets is recovered, and a sintering operation of powdered mineral aggregates is completed by taking the tail gas as the combustion-supporting gas of the reverberatory furnace outside the shaft kiln through the combustion-supporting air pipe, and by making full use of waste heat; thus an energy source is saved, and a pollution is reduced. The sintering shaft kiln of the phosphate pellets provides a processing device for a processing depth and a utilization level of powdered mineral resources, and reduces 20% of a coke ratio of a calcium magnesium phosphate fertilizer.

Description

technical field [0001] The invention relates to a phosphorus chemical equipment technology, in particular to a phosphate rock pellet sintering shaft kiln. Background technique [0002] The present invention aims at the problem of accumulation of mineral powder, coke powder and other powder materials in calcium magnesium phosphate fertilizer and thermal phosphorus chemical production enterprises, which not only accumulates funds, but also affects the environment and causes secondary pollution. Although the investment of sintering into agglomerates by flat blowing is small, the cost is high and the pollution is serious, and the country has explicitly eliminated its use; the sintering process of a large smelter (grinding by a ball mill, forming a ball, and sintering in a rotary kiln) is used for pellet sintering, and equipment investment is required. Large, high operating costs, the calcium magnesium phosphate fertilizer plant and thermal phosphating plant cannot afford and inv...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a phosphate rock pellet sintering shaft kiln to solve the problem of accumulation of mineral powder, coke powder and other powder materials in calcium-magnesium phosphate fertilizer and thermal phosphorus chemical production enterprises. It also affects the environment and causes The status quo of secondary pollution

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