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Method for preparing calcium sulfate whisker and magnesium hydroxide by hydrochloric acid and phosphate tailing

A calcium sulfate whisker and magnesium hydroxide technology, applied in the direction of magnesium hydroxide, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of restricting compound fertilizer production capacity, overcapacity, and low quality, and achieve Low production cost, reduced pressure on environmental protection, and simple production process

Inactive Publication Date: 2017-08-15
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrochloric acid is a by-product of compound fertilizer, which has low quality and excess production capacity, which seriously restricts the production capacity of compound fertilizer

Method used

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  • Method for preparing calcium sulfate whisker and magnesium hydroxide by hydrochloric acid and phosphate tailing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add phosphorus tailings, mother liquor II, mother liquor III, hydrochloric acid, and washing water into the leaching tank, control the amount of HCl in the leaching tank to be 2.0 times that of CaO and MgO in the phosphorus tailings, and fully mix and react in the leaching tank , the reaction temperature is 40° C., and the reaction time is 30 minutes. The obtained reaction first slurry is subjected to solid-liquid separation I, and acid-insoluble matter and mother liquor I are separated. According to Ca in mother liquor Ⅰ 2+ The total amount of sulfuric acid is added, and the amount of sulfuric acid added = Ca in mother liquor I 2+ The amount of the substance, control reaction temperature 40 ℃, reaction time 30 minutes, generate calcium sulfate whisker. The second slurry containing calcium sulfate whiskers is subjected to solid-liquid separation II to separate calcium sulfate whiskers and mother liquor II. Wash the calcium sulfate whiskers with water to obtain high-p...

Embodiment 2

[0039] Add phosphorus tailings, mother liquor II, mother liquor III, hydrochloric acid, and washing water to the leaching tank, control the amount of HCl in the leaching tank to be 2.5 times that of CaO and MgO in the phosphorus tailings, and fully mix and react in the leaching tank , the reaction temperature is 50° C., and the reaction time is 60 minutes. The obtained first reaction slurry is subjected to solid-liquid separation I, and acid-insoluble matter and mother liquor I are separated. According to Ca in mother liquor Ⅰ 2+ The total amount of sulfuric acid is added, and the amount of sulfuric acid added = Ca in mother liquor I 2+ The amount of substance, control reaction temperature 30 ℃, reaction time 60 minutes, generate calcium sulfate whisker. The second slurry containing calcium sulfate whiskers is subjected to solid-liquid separation II to separate calcium sulfate whiskers and mother liquor II. Wash the calcium sulfate whiskers with water to obtain high-purity ...

Embodiment 3

[0042] Add phosphorus tailings, mother liquor II, mother liquor III, hydrochloric acid, and washing water to the leaching tank, control the amount of HCl in the leaching tank to be 2.2 times that of CaO and MgO in the phosphorus tailings, and fully mix and react in the leaching tank , the reaction temperature is 30° C., and the reaction time is 60 minutes. The obtained reaction first slurry is subjected to solid-liquid separation I, and acid-insoluble matter and mother liquor I are separated. According to Ca in mother liquor Ⅰ 2+ The total amount of sulfuric acid is added, and the amount of sulfuric acid added = Ca in mother liquor I 2+The amount of the substance, control reaction temperature 50 ℃, reaction time 45 minutes, generate calcium sulfate whisker. The second slurry containing calcium sulfate whiskers is subjected to solid-liquid separation II to separate calcium sulfate whiskers and mother liquor II. Wash the calcium sulfate whiskers with water to obtain high-puri...

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Abstract

The invention relates to a method for preparing calcium sulfate whisker and magnesium hydroxide by hydrochloric acid and phosphate tailing. The method comprises the following steps: phosphate tailing and hydrochloric acid are fully mixed in a leaching groove, an obtained reacted first slurry is subjected to solid-liquid separation I, the acid insoluble substance and mother liquor I are separated, the mother liquor I is added in sulfuric acid in proportion to generate a second slurry containing calcium sulfate whisker, through solid-liquid separation II, the calcium sulfate whisker and mother liquor II are separated, a part of the mother liquor II is subjected to flash evaporation, a part of free hydrochloric acid is recovered, the mother liquor after recovery of hydrochloric acid is added in calcium hydrate (or calcium oxide), a third slurry containing magnesium hydroxide precipitate is obtained through a reaction, the third slurry is subjected to solid-liquid separation III, the magnesium hydroxide and mother liquor III are separated, and the mother liquor III is returned to the leaching groove. According to the invention, waste phosphate tailing and industrial by-product hydrochloric acid are taken as the production raw materials, sulfuric acid and calcium hydrate (calcium oxide), and whisker of magnesium hydroxide and calcium sulfate are added, the whole production has the advantages of simple process and totally-enclosed circulation, the waste can be changed to valuables, and cleaning production is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a method for preparing calcium sulfate whiskers and magnesium hydroxide from hydrochloric acid and phosphorus tailings, specifically a method of using hydrochloric acid and phosphorus tailings mixed liquid, adding sulfuric acid and calcium hydroxide (calcium oxide ) method for producing calcium sulfate whiskers and magnesium hydroxide by reaction. Background technique [0002] my country's phosphate rock reserves are relatively abundant, but most of them are low-grade ore, and most of them are refractory minerals. As a large agricultural country, phosphate rock resources are widely used in the production of agricultural chemical fertilizers. Phosphorus resources have shifted from high-grade ore mining to low-grade lean ore mining, resulting in a large amount of phosphorus tailings. The accumulation of phosphorus tailings not only leads to the waste of resources, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/14C01F5/22C01F11/46
CPCC30B29/62C01F5/22C01F11/46C01P2006/80C30B7/14C30B29/46
Inventor 田承涛肖林波徐思红方超李攀红周玲玲王琳
Owner HUBEI SANNING CHEM
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