A method for preparing anhydrous calcium sulfate filler with phosphogypsum

A technology of anhydrous calcium sulfate and phosphogypsum, applied in chemical instruments and methods, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve the problems of low technical content and low added value of products, and achieve broad industrial application prospects , good economic benefits, and the effect of increasing added value

Inactive Publication Date: 2018-11-02
SICHUAN SHIFANG XINGTIANFENG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at the current status of comprehensive utilization of phosphogypsum, its comprehensive utilization products have low technical content and product added value, and it is still impossible to upgrade phosphogypsum to a product with high technical content, high added value and wide market application

Method used

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  • A method for preparing anhydrous calcium sulfate filler with phosphogypsum
  • A method for preparing anhydrous calcium sulfate filler with phosphogypsum
  • A method for preparing anhydrous calcium sulfate filler with phosphogypsum

Examples

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Embodiment Construction

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but not limited to the following embodiments.

[0033] This example is to provide a preparation method of "Double 90" anhydrous calcium sulfate filler with high raw material utilization rate, simple process and high purity.

[0034] Such as figure 1 As shown, the method includes the following steps: preparing raw materials, decrystallization water, preliminary impurity removal reaction, deep impurity removal reaction, solid-liquid separation, pH adjustment, drying and calcination and particle size classification;

[0035] Such as figure 2 As shown, the specific steps of this method are as follows:

[0036] (1) The following raw materials are taken in parts by weight: 200-220 phosphogypsum with a free water rate of 21.8%, 80-100 concentrated sulfuric acid with a mass concentration of not less than 95%, and 5-...

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Abstract

The invention discloses a method for preparing anhydrous calcium sulfate filler by using phosphogypsum, comprising the steps of preparing the material phosphogypsum, concentrated sulfuric acid and an oxidizing agent; mixing the concentrated sulfuric acid, phosphogypsum and returned acid, removing crystallization water, and carrying out initial cleaning reaction; adding an oxidizing agent to carry out deep cleaning reaction; carrying out solid separation and washing; adding lime milk to adjust pH; carrying out solid-liquid separation, dry calcination and size grading. The added value of the phosphogypsum is increased, 'double 90' high-quality functional filler-level anhydrous calcium sulfate with particle size of <2Mum, particle content of >90% and whiteness of >90% can be produced, and the method has high material utilization rate and good process simplicity and is suitable for popularization and application.

Description

technical field [0001] The invention relates to a preparation method of calcium sulfate filler, in particular to a method for preparing anhydrous calcium sulfate filler by using phosphogypsum. Background technique [0002] Wet-process phosphoric acid production uses phosphate rock and concentrated sulfuric acid as raw materials, and a large amount of phosphogypsum (CaSO4·2H2O) is produced by-product during the reaction to generate phosphoric acid. The production of one ton of phosphoric acid (calculated as P2O5) can produce about 5-6 tons of by-product phosphogypsum. At present, the annual discharge of phosphogypsum by wet-process phosphoric acid enterprises in my country is about 50 million tons, and the stock of its by-product phosphogypsum is 250-300 million tons. The hidden danger is huge; since phosphogypsum contains a variety of impurities (such as phosphoric acid and phosphate, eutectic phosphorus, fluoride, organic impurities and metal salts) in addition to calcium su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01F11/466C01F11/468C01P2004/61C01P2006/65C01P2006/80
Inventor 张小东王大为张林黄波王敏
Owner SICHUAN SHIFANG XINGTIANFENG TECH CO LTD
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