Method and device for producing monoammonium phosphate by wet-method phosphoric acid based on multiple neutralizations

Abstract

The invention discloses a method and a device for producing monoammonium phosphate by wet-method phosphoric acid based on multiple neutralizations. The method of a process comprises the following steps of preparing the phosphoric acid through a wet method; pretreating the wet-method phosphoric acid; primarily neutralizing; primarily filtering through a belt conveyor; secondarily neutralizing; secondarily filtering through a press filter; regulating an index; concentrating and crystallizing; separating and oven-drying. The method has the following beneficial effects that the press filter is replaced by adopting the belt conveyor in a filtration procedure; on the basis of the same production capacity, the labor can be decreased by 90 percent; the labor intensity of a worker is greatly reduced; after the belt conveyor is adopted, the labor intensity is only 10 percent of original one. According to the process, a secondary neutralization method and the mother solution circular treatment are adopted to carry out deep impurity removal; the problem of impurity in the wet-method phosphoric acid can be quite well solved; the production requirement of industrial-grade monoammonium phosphate can be met; the production is run continuously and stably. Therefore, the effects of decreasing production cost and promoting the market competitiveness of a product are achieved.

Description

technical field [0001] The invention relates to a method for producing monoammonium phosphate by wet-process phosphoric acid, in particular to a method and device for producing monoammonium phosphate based on wet-process phosphoric acid that has been neutralized multiple times. Background technique [0002] With the rapid development of fine phosphating industry at home and abroad, the market demand for industrial monoammonium phosphate is increasing day by day. Almost all of the traditional processes use thermal phosphoric acid as raw material for production. Since 2003, due to the accelerated commercialization of electric power in China and the shortage of electricity, the price of thermal phosphoric acid has risen. Many ammonium phosphate manufacturers have to stop production due to high costs, thus As a result, the supply of goods in the market is scarce, and the price of industrial-grade ammonium phosphate has skyrocketed. Many domestic scientific research institutes an...

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Problems solved by technology

[0004] In addition, the current domestic industrial monoammonium phosphate manufacturers use filter presses for filtration in the filtration process. With the same production capacity, the number of supporting filter presses required is large, the labor intensity of workers is high, the filter cloth is difficult to disassemble and wash, and the consumption of auxiliary materials for production is large. poor continuity

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