Method for co-production of raw gypsum in preparation of Yengsu calcium chloride dihydrate by phosphogypsum

A technology of calcium chloride and phosphogypsum, applied in calcium/strontium/barium chloride, solid waste removal, calcium/strontium/barium halide, etc., to achieve small investment, considerable economic value, and environmental protection

Inactive Publication Date: 2010-09-08
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to make full use of the discarded yellow phosphorus slag, people have carried out a lot of research on this, such as the Chinese patent literature, the application number is 200810159713.7 which discloses a method for preparing phosphogypsum from industrial waste phosphogypsum, but has not yet used phosphogypsum to make two Related reports on the method of combining calcium chloride with water to produce gypsum

Method used

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  • Method for co-production of raw gypsum in preparation of Yengsu calcium chloride dihydrate by phosphogypsum
  • Method for co-production of raw gypsum in preparation of Yengsu calcium chloride dihydrate by phosphogypsum

Examples

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Embodiment 1

[0025] The method for producing calcium chloride dihydrate and co-producing gypsum with phosphogypsum, the preparation process is as follows:

[0026] 500 kg of converted pure phosphogypsum and hydrochloric acid are put into the purification purifier 1 according to the mass ratio of pure substances 1:0.34, and the chemical reaction is carried out under gentle stirring; the first suction filter 2 is used for suction filtration to obtain clarified 258.49 kg of For the mixed solution of pure calcium chloride and 228.22kg of pure sulfuric acid, the filter cake has only a small amount of impurities buried or burned.

[0027] Put the above-mentioned mixed solution of calcium chloride and sulfuric acid and sodium hydroxide into the synthesizer 3 according to the mass ratio of pure substance 1: 0.56, carry out the chemical reaction under gentle stirring, and use the second suction filter 4 to extract Filter to obtain clarified calcium chloride solution and white calcium sulfate filter...

Embodiment 2

[0030] The method for producing calcium chloride dihydrate and co-producing gypsum with phosphogypsum, the preparation process is as follows:

[0031] 500 kg of converted pure phosphogypsum and hydrochloric acid are put into the purification purifier 1 according to the mass ratio of pure substances 1:0.54, and the chemical reaction is carried out under gentle stirring; the first suction filter 2 is used for suction filtration to obtain clarified 410.55 kg of phosphogypsum. For the mixed solution of pure calcium chloride and 362.47kg of pure sulfuric acid, the filter cake has only a small amount of impurities buried or burned.

[0032] Put the above-mentioned mixed solution of calcium chloride and sulfuric acid and sodium hydroxide into the synthesizer 3 according to the mass ratio of pure substance 1: 76, carry out chemical reaction under gentle stirring, and use the second suction filter 4 to extract Filter to obtain clarified calcium chloride solution and white calcium sulfa...

Embodiment 3

[0035] The method for producing calcium chloride dihydrate and co-producing gypsum with phosphogypsum, the preparation process is as follows:

[0036] 500 kg of converted pure phosphogypsum and hydrochloric acid are put into the purification purifier 1 according to the mass ratio of pure substances 1:0.74, and the chemical reaction is carried out under gentle stirring; the first suction filter 2 is used for suction filtration to obtain clarified 562.60 kg of phosphogypsum. For the mixed solution of pure calcium chloride and 496.71kg of pure sulfuric acid, the filter cake has only a small amount of impurities buried or burned.

[0037] Put the above-mentioned mixed solution of calcium chloride and sulfuric acid and sodium hydroxide into the synthesizer 3 according to the mass ratio of pure substance 1: 0.96, carry out the chemical reaction under gentle stirring, and use the second suction filter 4 to extract Filter to obtain clarified calcium chloride solution and white calcium...

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Abstract

The invention belongs to the technical field of treatment and utilization of chemical 'three wastes', in particular to a method for co-production of raw gypsum in the preparation of Yengsu calcium chloride dihydrate by phosphogypsum. In the main technical scheme, phosphogypsum is purified and synthesized to obtain mixed solution of calcium chloride and calcium sulfate, a crystal calcium chloride dihydrate product can be obtained through distillation, washing, crushing and packaging of calcium chloride, and a white raw gypsum product can be obtained through washing, dehydrating, drying, crushing and packaging of the filter cake. The invention has the advantages of low production cost, high profit, large market demand and simple process and production equipment, and is a practical method for treatment and utilization. Moreover, the invention not only needs low investment, but also can create considerable economic value, eliminate the chemical waste residues, and protect the environment.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of inorganic chemical wastes, in particular to a method for producing calcium chloride dihydrate and co-producing gypsum with phosphogypsum. technical background [0002] At present, in the treatment of waste residue phosphogypsum in the phosphoric acid industry, most of them are processed and refined to produce pure gypsum to become building materials, and some are also used as cement retarders to be directly sold to cement plants and concrete mixing stations, and sulfuric acid and gypsum are prepared by calcination. Calcium Oxide. Although these methods can use waste residue phosphogypsum to produce corresponding products, their production process is relatively complicated, the production cost is high, it is difficult to industrialize, and it is difficult to meet the needs of the market. [0003] Calcium chloride dihydrate, also known as ice calcium, is a colorless crystal, ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24C04B11/26B09B3/00
Inventor 王嘉兴
Owner 汪晋强
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