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Device for wet phosphoric acid refining and high-purity ammonium molybdate preparation

A wet-process phosphoric acid, ammonium molybdate technology, applied in molybdenum compounds, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of high equipment investment and depreciation costs, unstable quality of purified products, and difficulty in meeting tolerance at the same time. , to achieve the effect of convenient operation, reduce the number of processing and floor space, avoid volatilization and decomposition

Active Publication Date: 2008-10-01
侯炎学 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the wet-process phosphoric acid produced by medium and low-grade phosphate rock, due to its high impurity content, it is easy to cause equipment damage during the purification and refining process, and the quality of the purified product is unstable.
[0003] At present, 904L or two-way stainless steel is often used to manufacture wet-process phosphoric acid refining equipment. The price of these two materials is very expensive, and there is still a corrosion rate of 1-2 mm per year, which makes the equipment investment and depreciation costs higher.
However, it is difficult to meet the corrosion resistance of polar organic solvents and phosphoric acid at the same time by using other materials other than those described in this patent, especially when phosphoric acid contains a large amount of fluoride ions and sulfuric acid.

Method used

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  • Device for wet phosphoric acid refining and high-purity ammonium molybdate preparation
  • Device for wet phosphoric acid refining and high-purity ammonium molybdate preparation
  • Device for wet phosphoric acid refining and high-purity ammonium molybdate preparation

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Embodiment 1

[0055] By Fig. 1, 2, 3, the present invention is used for wet-process phosphoric acid refining and prepares the device of high-purity ammonium molybdate, comprises: extraction tank 1, washing tank and stripping tank;

[0056] The raw materials of the extraction tank 1, the washing tank and the stripping tank are made of I-shaped steel as the skeleton, and the o-phthalic resin is used as the matrix, and the surface is covered with polypropylene;

[0057] The interior of the extraction tank 1 is divided into seven rectangular sub-tanks with a partition 4 of the same material as the tank body. Each sub-tank includes a clarification chamber 2 and a mixing chamber 3. The upper part of the clarification chamber 2 and the mixing chamber 3 The organic phase reflux groove 4a is separated from the partition plate with the mixed phase outlet hole 4b in the middle, and the mixing chamber between the upper and lower sub-troughs is adjacent to the clarification chamber;

[0058]The extracti...

Embodiment 2

[0090] The tank bodies of the extraction tank 1, the washing and stripping tank 5 and the extraction and stripping tank 6 are made of I-shaped steel as the skeleton, with m-benzene resin as the matrix, and the surface is covered with novolac epoxy vinyl ester resin. The internal partitions 4 of the tank, the heavy phase weirs 3i, 3h, and the L-shaped baffles 3j are made of m-benzene resin as the matrix, and the surface is covered with novolac epoxy vinyl ester resin.

Embodiment 3

[0092] The tank bodies of the extraction tank 1, the washing and stripping tank 5 and the extracting and stripping tank 6 are made of channel steel as the skeleton, tetrabromo or tetrahydrophthalic anhydride resin as the matrix, and the surface is covered with novolac epoxy vinyl ester resin. The inner part of the tank The inner part of the tank 4, the heavy phase weir plate 3i, 3h, and the L-shaped baffle 3j are based on tetrabromo or tetrahydrophthalic anhydride resin, and the surface is covered with novolac epoxy vinyl ester resin.

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PUM

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Abstract

The invention relates to a device for preparing phosphoric acid and ammonium molybdate, in particular to a device used for refining phosphoric acid by a wet process and preparing high purity ammonium molybdate, and pertains to the field of chemical equipment. The device of the invention comprises an extraction tank, a washing tank and an anti-extraction tank which are all tank-typed mixer-settler extractor. By adopting a structure with a steel framework and made from organic materials, the device can not only effectively prevent corrosion by extraction agent, phosphoric acid, fluoride and sulfuric acid, but also can ensure the stability and durability of the structures of the tanks.

Description

technical field [0001] The invention relates to a device for preparing phosphoric acid and ammonium molybdate, in particular to a device for refining wet-process phosphoric acid and preparing high-purity ammonium molybdate. It belongs to the field of chemical equipment. Background technique [0002] The industry often adopts tower equipment to realize the refining of wet-process phosphoric acid (patent 200420033478.6, patent 200410081600.1) and has achieved certain results. However, for wet-process phosphoric acid produced from medium and low-grade phosphate rock, due to its high impurity content, it is easy to cause equipment damage during the purification and refining process, and the quality of purified products is unstable. [0003] At present, 904L or two-way stainless steel is often used to manufacture wet-process phosphoric acid refining equipment. The price of these two materials is very expensive, and there is still a corrosion rate of 1-2 mm per year, which makes ...

Claims

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Application Information

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IPC IPC(8): C01B25/46C01G39/00
Inventor 侯炎学吴杰黄华
Owner 侯炎学
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