Method for purifying phosphogypsum by using hydrocyclone

A technology of hydrocyclone separation and phosphogypsum, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve the problems of large tail gas pollution, large primary investment, secondary pollution, etc., and achieve separation operation. Low cost, reduced water consumption, energy saving effect

Inactive Publication Date: 2017-03-15
柳州紫荆技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water washing method has the advantage of high impurity removal rate, but has the disadvantages of large initial investment, high energy consumption and secondary pollution.
The main disadvantage of the neutralization method is that it cannot deal with impurities such as water-soluble salts, which makes comprehensive utilization difficult.
The calcination method also has problems such as high energy consumption, large tail gas pollution and corrosion of equipment.

Method used

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  • Method for purifying phosphogypsum by using hydrocyclone
  • Method for purifying phosphogypsum by using hydrocyclone
  • Method for purifying phosphogypsum by using hydrocyclone

Examples

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Effect test

Embodiment 1

[0035] Concrete purification example one: choose phosphogypsum with a calcium sulfate dihydrate content of 70% as a raw material, mix phosphogypsum and water at a ratio of 20:80 by weight and then grind to form a slurry, that is, phosphogypsum and water After mixing, put it into a beater for beating for 30 minutes, filter and sieve the ground slurry through a 40-mesh square hole sieve, remove impurities left on the hole sieve, and filter the slurry that can pass through the hole sieve Put it into the stirring tank for stirring; while stirring, pump the slurry in the stirring tank into the hydrocyclone, control the pressure of the feed inlet of the hydrocyclone to 0.1Mpa, and the slurry at a rate of 5m / s The speed enters the cylindrical barrel at the upper end of the hydrocyclone from the feed port along the tangential direction, and then the slurry is purified and separated by the hydrocyclone, and the separated impurities follow the flow of water from the hydrocyclone. The ov...

Embodiment 2

[0036] Embodiment 2: choose phosphogypsum with a calcium sulfate dihydrate content of 75% as raw material, mix phosphogypsum and water at a ratio of 30:70 by weight and then grind to form a slurry, that is, after mixing phosphogypsum with water Put it into the beater and beat for 45 minutes, filter and sieve the ground slurry through a 40-mesh square hole sieve, remove the impurities left on the hole sieve, put the filtered slurry that can pass through the hole sieve into Stir in the stirring tank; while stirring, the slurry in the stirring tank is pumped into the hydrocyclone, and the pressure of the feed inlet of the hydrocyclone is controlled to be 0.2Mpa, and the slurry flows from the hydrocyclone at a speed of 8m / s. The feed inlet enters the cylindrical barrel at the upper end of the hydrocyclone along the tangential direction, and then the slurry is purified and separated by the hydrocyclone, and the separated impurities follow the overflow of the water from the hydrocycl...

Embodiment 3

[0037]Embodiment 3: choose phosphogypsum with a calcium sulfate dihydrate content of 80% as raw material, mix phosphogypsum and water at a ratio of 15:85 by weight and then grind to form a slurry, that is, after mixing phosphogypsum with water Put it into the beater for beating for 90 minutes, filter and sieve the ground slurry through a 60-mesh square hole sieve, remove the impurities left on the hole sieve, put the filtered slurry that can pass through the hole sieve into Stir in the stirring tank; while stirring, the slurry in the stirring tank is pumped into the hydrocyclone, and the pressure at the inlet of the hydrocyclone is controlled to be 0.3Mpa, and the slurry flows from the hydrocyclone at a speed of 10m / s. The feed inlet enters the cylindrical barrel at the upper end of the hydrocyclone along the tangential direction, and then the slurry is purified and separated by the hydrocyclone, and the separated impurities follow the overflow of the water from the hydrocyclon...

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Abstract

The invention relates to a method for purifying phosphogypsum by using hydrocyclone. The method comprises the following steps: mixing the phosphogypsum with water according to the weight part ratio of 5-40: 60-95, and then grinding the mixture into slurry; sieving the slurry obtained in the step A by using a square hole sieve with meshes of 40-100, and stirring the slurry capable of passing through the sieve in a stirring pond; pumping the slurry in the stirring pond in the hydrocyclone while stirring, and purifying and separating the slurry by the hydrocyclone under the condition that the pressure of a feeding opening of the hydrocyclone is 0.1-0.4 Mpa so that impurities which are separated out flow out from an overflowing opening of the hydrocyclone along with the water and enter a settling pond and the high-purity phosphogypsum obtained by purification flows out from a discharging opening of the hydrocyclone; and naturally filtering out water from the phosphogypsum slurry obtained by purification or centrifugally separating the phosphogypsum slurry to obtain the high-purity phosphogypsum. By the method, water consumption in a purification process can be reduced.

Description

technical field [0001] The invention relates to a solid waste treatment technology, in particular to a method for purifying phosphogypsum by using a hydrocyclone separator. Background technique [0002] Phosphogypsum is the solid waste generated when sulfuric acid is used to treat phosphate rock in the production of phosphoric acid. Phosphogypsum contains a lot of harmful impurities, which not only occupies land, but also brings a lot of environmental pollution problems. In order to comprehensively utilize phosphogypsum, it needs to be purified. [0003] At present, the main methods of purification of phosphogypsum are water washing, neutralization and calcination. The water washing method has the advantage of high impurity removal rate, but has the disadvantages of large initial investment, high energy consumption and secondary pollution. The main disadvantage of the neutralization method is that it cannot deal with impurities such as water-soluble salts, which makes compr...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/468C01P2006/80
Inventor 易汉平严学军张弦梁才王立彬
Owner 柳州紫荆技术转移中心有限公司
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