Method for preparing ammonium chloride and light magnesium carbonate from phosphate tailings and recycling ammonium chloride and light magnesium carbonate

A technology of light magnesium carbonate and ammonium chloride is applied in the field of waste resource utilization, which can solve the problems of low added value of products and low utilization rate of phosphorus tailings, so as to improve comprehensive utilization efficiency and facilitate industrialization promotion. , the effect of convenient operation

Pending Publication Date: 2020-08-04
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method of using phosphorus tailings to prepare ammonium chloride and light magnesium carbonate and recycle them, so as to solve the problems of low resource utilization rate of existing phosphorus tailings and low added value of products

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  • Method for preparing ammonium chloride and light magnesium carbonate from phosphate tailings and recycling ammonium chloride and light magnesium carbonate

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Embodiment 1

[0033] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 6.5%, MgO: 13.1%, CaO: 31.9%.

[0034] combine figure 1 As shown, the method of utilizing phosphorus tailings to prepare ammonium chloride and light magnesium carbonate and recycling in the present embodiment specifically includes the following steps:

[0035] 1) Weigh 100g of phosphorus tailings and put it into the acidolysis reactor, add 232mL of tap water and heat up to 40°C, slowly add 232mL of industrial hydrochloric acid with a mass fraction of 35%, after acidolysis for 25 minutes, heat-preserve and suction filter, and wash The silicon slag obtained by suction filtration obtains the acid solution A;

[0036] 2) The ratio of ammonium sulfate and the amount of calcium ion in the above-mentioned acid solution A is 1: 1 to configure the ammonium sulfate solution with a mass fraction of 30%, and add the configured ammonium sulfate solution to the reactor Raise the temperature to 70°C...

Embodiment 2

[0043] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 3.8%, MgO: 14.2%, CaO: 35.8%.

[0044] combine figure 1 As shown, the method of utilizing phosphorus tailings to prepare ammonium chloride and light magnesium carbonate and recycling in the present embodiment specifically includes the following steps:

[0045] 1) Weigh 90g of phosphorus tailings and put it into an acidolysis reactor, add 195mL of tap water and heat up to 50°C, slowly add 232mL of industrial hydrochloric acid with a mass fraction of 35%, and after acidolysis for 35 minutes, heat-preserve and suction filter, and wash The silicon slag obtained by suction filtration obtains the acid solution A;

[0046]2) The ratio of ammonium sulfate and the amount of calcium ion in the above-mentioned acid solution A is 1.2: 1. The mass fraction is 40% ammonium sulfate solution, and the configured ammonium sulfate solution is added to the reactor Raise the temperature to 80°C, then slow...

Embodiment 3

[0053] In an embodiment, the raw ore chemical composition of phosphate rock is: P 2 o 5 : 8.5%, MgO: 13.8%, CaO: 40.5%.

[0054] combine figure 1 As shown, the method of utilizing phosphorus tailings to prepare ammonium chloride and light magnesium carbonate and recycling in the present embodiment specifically includes the following steps:

[0055] 1) Weigh 82g of phosphorus tailings and put it into the acidolysis reactor, add 170mL of tap water and heat up to 60°C, slowly add 232mL of industrial hydrochloric acid with a mass fraction of 35%, and after acidolysis for 45 minutes, heat-preserve and suction filter, and wash The silicon slag obtained by suction filtration obtains the acid solution A;

[0056] 2) Ammonium sulfate solution with a mass fraction of 55% is configured in an amount of 1.4:1 in the ratio of ammonium sulfate to the amount of calcium ion in the above-mentioned acid solution A, and the configured ammonium sulfate solution is added to the reactor Raise th...

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Abstract

The invention provides a method for preparing ammonium chloride and light magnesium carbonate from phosphate tailings and recycling the ammonium chloride and the light magnesium carbonate. The methodcomprises the following steps: carrying out acidolysis on the phosphate tailings, adding a decalcifying agent into the acidolysis solution, carrying out a decalcifying reaction to obtain calcium sulfate whiskers and a decalcifying mother solution, adding a dephosphorizing agent into the decalcifying mother solution, carrying out a dephosphorizing reaction, and carrying out vacuum concentration ona mixed solution obtained by the dephosphorizing reaction to obtain an ammonium chloride crude product and a magnesium chloride solution, recrystallizing the ammonium chloride crude product to obtaina fine ammonium chloride product, mixing the residual liquid obtained by carrying out reduced pressure distillation on the filtrate obtained in the recrystallization process with the magnesium chloride solution, adding a magnesium precipitation agent, carrying out a magnesium precipitation reaction to obtain magnesium carbonate, and mixing the filtrate generated by the magnesium precipitation reaction with the mixed solution obtained by the dephosphorizing reaction for recycling. The phosphorus tailings are used as a raw material to produce the ammonium chloride and the magnesium carbonate andthe byproduct calcium sulfate whiskers, the residual liquid is recycled, and the goals of changing the waste phosphorus chemical solid waste into valuable substances and clean production are implemented.

Description

technical field [0001] The invention relates to the technical field of waste resource utilization, in particular to a method for preparing ammonium chloride and light magnesium carbonate from phosphorous tailings and recycling them. Background technique [0002] my country is rich in phosphate rock resources, which is one of the main fertilizers necessary for agricultural production - the raw material of phosphate fertilizer. However, with the continuous mining of phosphate rock, the existing phosphate rock gradually tends to be depleted, and most of the phosphate rock is mainly low-grade and difficult-to-select colphosphane. Phosphorus tailings is the tailings slag remaining after phosphate ore beneficiation and extraction of concentrate. It is essentially a solid waste, and its main component is dolomite (MgCO 3 ·CaCO 3 ), fluorapatite and aluminosilicates. Phosphorus tailings produced by phosphate rock reverse flotation are mainly composed of dolomite, of which the MgO...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01C1/16C01F5/24
CPCC01F11/46C01C1/164C01F5/24C01P2004/10
Inventor 吴汉军潘志权张华丽潘洁
Owner WUHAN INSTITUTE OF TECHNOLOGY
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