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

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

Experimental program
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Example Embodiment

[0035] Specific purification example 1: Choose phosphogypsum with a content of 70% calcium sulfate dihydrate as raw material, mix phosphogypsum and water at a weight ratio of 20:80, and then grind to form a slurry, that is, phosphogypsum and water After mixing, put it into a beating machine for 30 minutes to be beaten. The ground slurry is filtered and sieved through a 40-mesh square sieve to remove impurities left on the sieve. The filtered slurry that can pass through the sieve Put the slurry in the mixing tank for stirring; while stirring, the slurry in the mixing tank is pumped to the hydrocyclone separator, and the pressure at the inlet of the hydrocyclone separator is controlled to be 0.1Mpa, and the slurry is at a rate of 5m / s. The speed enters the cylindrical cylinder at the upper end of the hydrocyclone from the feed port in the tangential direction, and then the slurry is purified and separated by the hydrocyclone. The separated impurities follow the water from the hyd...

Example Embodiment

[0036] Example 2: Using phosphogypsum with a content of 75% calcium sulfate dihydrate as the raw material, mixing the phosphogypsum and water at a weight ratio of 30:70 and then grinding to form a slurry, that is, after mixing the phosphogypsum with water Put the slurry into the beater for 45 minutes. Filter the ground slurry through a 40-mesh square sieve to remove the impurities left on the sieve. Put the filtered slurry that can pass through the sieve. Stirring in the stirring tank; while stirring, the slurry in the stirring tank is pumped to the hydrocyclone separator, and the pressure at the inlet of the hydrocyclone separator is controlled to 0.2Mpa, and the slurry is removed from the water at a speed of 8m / s. The feed inlet enters the cylindrical cylinder at the upper end of the hydrocyclone in the tangential direction, and then the slurry is purified and separated by the hydrocyclone. The separated impurities follow the overflow of the water from the hydrocyclone. The o...

Example Embodiment

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

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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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