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A kind of device and method for preparing sulfur from phosphogypsum

A phosphogypsum and sulfur technology, which is applied in the fields of resource utilization and environmental protection, can solve the problems of poor cement quality, high energy consumption, and poor efficiency, and achieve the effects of making full use of energy, low operating costs, and good economic benefits.

Active Publication Date: 2021-04-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In 2011, the by-product of phosphogypsum in China was 67.5 million tons. At present, the discharge of phosphogypsum is increasing at a rate of 5% to 10% every year. The accumulated stock of phosphogypsum in China has exceeded 300 million tons, but the comprehensive utilization rate is still less than the output of the year. 20%
At present, although several domestic production lines for co-production of cement with sulfuric acid from phosphogypsum have been built, they are difficult to promote due to problems such as high energy consumption, poor cement quality, high calcination temperature, difficult operation and poor efficiency.

Method used

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  • A kind of device and method for preparing sulfur from phosphogypsum

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Experimental program
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Effect test

Embodiment 1

[0056] The annual processing of phosphogypsum is 7500 tons, 1000kg / h of phosphogypsum is added from phosphogypsum storage tank 1, 220kg / h of coke is added from reducing agent storage tank 2, 100kg / h of manganese ore powder is added from batching storage tank 3, and it enters the ball mill through weighing scale 4, carry out grinding until the material is crushed to below 160 mesh to obtain the grinding material; use the bucket elevator 5 to send the grinding material into the sulfur reaction rotary kiln 6 kiln head and enter the sulfur reaction rotary kiln 6 for further processing Decomposition and reduction reaction to obtain mineral materials and sulfur tail gas. The mineral materials enter the quencher 7 from the kiln tail of the sulfur reaction rotary kiln and cool down to below 50°C to obtain a soil conditioner containing phosphorus, calcium and manganese;

[0057] The sulfur tail gas (temperature 600-650°C) enters the heat exchanger 8 from the kiln head of the sulfur reac...

Embodiment 2

[0060] Annual processing of 25,000 tons of phosphogypsum, 3300kg / h of phosphogypsum is added from phosphogypsum storage tank 1, 720kg / h of coke is added from reducing agent storage tank 2, 300kg / h of bentonite is added from batching storage tank 3, and it is fed into ball mill 4 by weighing inside, pulverized to less than 160 mesh to obtain grinding materials, and the grinding materials are sent to the kiln head of sulfur reaction rotary kiln 6 with bucket elevator 5 and enter the sulfur reaction rotary kiln 6 for decomposition and reduction reaction to obtain mineral materials and sulfur tail gas, the mineral material enters the quencher 7 from the kiln tail and is cooled to below 50°C to obtain a soil conditioner containing phosphorus, calcium and manganese.

[0061] The sulfur tail gas (temperature 600-650°C) enters the heat exchanger from the kiln head of the sulfur reaction rotary kiln to exchange heat with the cold-purified sulfur tail gas from the tail gas blower, and th...

Embodiment 3

[0064] Annual processing of 50,000 tons of phosphogypsum, adding 6600kg / h of phosphogypsum from phosphogypsum storage tank 1, adding 1440kg / h of coke from reducing agent storage tank 2, adding 500kg / h of magnesite powder from batching storage tank 3, and weighing into the ball mill 4, crushed to below 160 mesh to obtain the ground material, and the ground material is sent to the kiln head of the sulfur reaction rotary kiln 6 with the bucket elevator 5, and enters the sulfur reaction rotary kiln 6 for decomposition and reduction reaction. Mineral material and sulfur tail gas are obtained, and the mineral material enters the quencher 7 from the kiln tail and is cooled to below 50°C to obtain a soil conditioner containing phosphorus, calcium and magnesium.

[0065] The sulfur tail gas (temperature 600-650°C) enters the heat exchanger from the kiln head of the sulfur reaction rotary kiln to exchange heat with the cold-purified sulfur tail gas from the tail gas blower, and the tempe...

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Abstract

The invention belongs to the technical field of resource utilization and environmental protection, and in particular relates to a device and method for preparing sulfur from phosphogypsum. The present invention designs a sulfur reaction rotary kiln, quench cooler, heat exchanger, sulfur cooler and cooling scrubber, together with the existing equipment (ball mill, bucket elevator, electric dust collector and tail gas blower) to form a device for preparing sulfur from phosphogypsum , the device can prepare sulfur from waste phosphogypsum, and co-produce phosphorus-containing soil conditioner to realize resource utilization, and open up a new way for the comprehensive utilization of phosphogypsum; the device and method of the present invention prepare sulfur The process has no secondary pollution, and is an environment-friendly production technology; the scheme of the invention can make full use of energy, has low energy consumption, low operating cost, and good economic benefits.

Description

technical field [0001] The invention relates to the technical field of resource utilization and environmental protection, in particular to a device and method for preparing sulfur from phosphogypsum. Background technique [0002] Phosphoric acid is the main raw material for the production of high-concentration phosphorus compound fertilizers (such as diammonium phosphate, monoammonium phosphate, heavy calcium, phosphate-based compound fertilizers, etc.), and 1 ton of phosphoric acid (with 100% P 2 o 5 Total) produces about 4.5-5.5 tons of phosphogypsum (dry basis). [0003] In 2011, the by-product of phosphogypsum in China was 67.5 million tons. At present, the discharge of phosphogypsum is increasing at a rate of 5% to 10% every year. The accumulated stock of phosphogypsum in China has exceeded 300 million tons, but the comprehensive utilization rate is still less than the output of the year. 20%. In 2012, the stockpile of phosphogypsum in my country was close to 400 mil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/02C09K17/06C09K101/00
Inventor 宁平殷梁淘张秋林贾丽娟殷在飞
Owner KUNMING UNIV OF SCI & TECH