Comprehensive utilization method of silicate minerals

A silicate and mineral technology, used in the comprehensive utilization of non-metallic ores and hydrometallurgy, can solve the problems of harsh operation and equipment conditions, inability to prepare magnesium sulfate monohydrate products, and high energy consumption

Active Publication Date: 2015-09-09
河南省睿博环境工程技术有限公司
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Problems solved by technology

However, the shortcomings of these processes are: low product purity, which cannot meet the quality requirements of feed additives, such as the direct method of sulfuric acid, etc.; poor product solubility, such as high-temperature dehydration; high energy consumption, such as bittern evaporation; operation With harsh equipment conditions, such as high temperature and high pressure method
Therefore, the description of the preparation process of crude magnesium sulfate monohydrate in this method does not meet the most basic characteristics of the spray drying method.
[0009] (3) The crude magnesium sulfate monohydrate produced in the drying tower needs to be further sent to the cooling tower for cooling and crystallization, which is not only complicated in process, but also does not meet the characteristics of spray drying
[0010] (4), the production method of magnesium sulfate monohydrate described in this method lacks the refining means of magnesium sulfate, so the magnesium sulfate monohydrate product of feed grade cannot be prepared
[0011] (5), due to the many process procedures and long drying time of this method, there are still shortcomings such as high energy consumption
[0018] The disadvantage of this process is that when preparing solid polymeric ferric sulfate powder, liquid polymeric ferric sulfate needs to be concentrated at 90-150°C. From the physical characteristics of polymeric ferric sulfate, it can be synthesized at a temperature greater than 50°C or Drying will have a significant impact on the basicity of polyferric sulfate. The higher the temperature, the lower the basicity or even lose it; secondly, this method does not propose a stable method for the basicity of polyferric sulfate; meanwhile, polyferric sulfate is a Heat-sensitive products are very sensitive to temperature conditions. Although this method proposes the idea of ​​preparing solid polyferric sulfate by spray drying, it does no

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  • Comprehensive utilization method of silicate minerals

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Effect test

Embodiment 1

[0108] like figure 1As shown, the comprehensive utilization method of the silicate minerals, the processed ore is Sichuan Ya'an asbestos tailings, chemical composition: MgO: 35.74%, Fe 2 o 3 : 6.22%, SiO 2 : 41.81%, NiO: 0.37%, CoO: 0.031%, follow the steps below:

[0109] (1) Pulverize the asbestos tailings to 120 mesh, weigh 100kg of asbestos tailings powder and the secondary acid hydrolysis solution at a solid-to-liquid ratio of 1:2.5 (secondary acid hydrolysis solution 250L) and mix them in the primary acid hydrolysis reactor, After stirring evenly, add 1 kg of activator fluorite, then raise the temperature and add sulfuric acid, control the reaction temperature to 80°C, keep the reaction for 60 minutes, and control the end point pH value to 1. After the reaction was finished, 139kg of the first-level acidolysis residue (50.5% water content, 68.8kg in dry form) and 255L of the first-level acidolysis solution were obtained by filtration. MgSO in primary acid hydrolysis ...

Embodiment 2

[0124] The raw ore processed is asbestos tailings in Ya'an, Sichuan, chemical composition: SiO 2 : 41.81%, MgO: 35.74%, Fe 2 o 3 : 6.22%, NiO: 0.37%, CoO: 0.031%. Follow the steps below:

[0125] (1) Pulverize the asbestos tailings to 120 mesh, weigh 100kg of asbestos tailings powder and the secondary acid hydrolysis solution at a solid-to-liquid ratio of 1:5 (secondary acid hydrolysis solution 500L) and mix them in the primary acid hydrolysis reactor, After stirring evenly, add 1 kg of activator industrial calcium fluoride, then raise the temperature and add sulfuric acid, control the reaction temperature to 75°C, keep the reaction for 90 minutes, and control the end point pH value to 1. After the reaction was completed, 120 kg of the primary acidolysis residue (49.5% water content, 60.6 kg in dry form) and 500 L of the primary acidolysis solution were obtained by filtration. MgSO in primary acid hydrolysis solution 4 Concentration 213g / l, FeSO 4 The concentration was 2...

Embodiment 3

[0140] The raw ore processed is Serpentine Mine in Inner Mongolia Sunite Left Banner, chemical composition: MgO: 37.81%, SiO 2 : 36%, Fe 2 o 3 : 5.93%, Ni: 0.20%, Co: 0.009%.

[0141] (1) Crush the serpentine to 100 mesh, weigh 100kg of serpentine ore powder and the secondary acid hydrolysis solution at a solid-to-liquid ratio of 1:2.5 (secondary acid hydrolysis solution 250L) and mix them in the primary acid hydrolysis reactor After stirring evenly, add 1kg of activator, then raise the temperature and add sulfuric acid, control the reaction temperature to 85°C, keep the reaction for 60min, and control the end point pH value to 1.2. After the reaction was completed, 174 kg of the primary acidolysis residue (50.5% water content, 86 kg in dry form) and 262 L of the primary acidolysis solution were obtained by filtration. MgSO in primary acid hydrolysis solution 4 Concentration 432g / l, FeSO 4 The concentration was 42.7 g / l.

[0142] Mix the primary acidolysis residue and wa...

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Abstract

The invention discloses a comprehensive utilization method of silicate minerals. The method comprises the following steps: firstly decomposing silicate minerals by using sulfuric acid as a decomposing agent, and carrying out acid leaching of residues for preparation of white carbon black; sending an acidolysis solution into a magnesium sulfate heptahydrate crystallizer to prepare a magnesium sulfate heptahydrate product and an acidolysis solution obtained after separation of magnesium sulfate; mixing magnesium sulfate heptahydrate and water, adding an oxidizing agent, a pH regulator and an adsorbent to convert iron in the solution to a ferric hydroxide precipitate, filtering to obtain a pure magnesium sulfate solution, sending the magnesium sulfate solution into a magnesium sulfate monohydrate powder dedicated preparation system to prepare a feed-grade magnesium sulfate monohydrate product; separating an iron precipitate from the acidolysis solution by an oxidation-precipitation process, carrying out oxidation, carrying out a polymerization reaction, and solidifying to prepare a solid polymeric ferric sulfate product; and sending the acidolysis solution after separation of the iron precipitate to a follow-up process to prepare a magnesium compound. According to the invention, insufficiencies such as high energy consumption during present technical process of production, low product purity and the like are overcome; and there is no emission of ''three wastes (waste gas, waste water and industrial residue) '' during the production process, so as to minimize the influence on the environment.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of non-metallic ores and hydrometallurgy, and in particular relates to a comprehensive utilization method of silicate minerals (any one of serpentine ore, asbestos tailings and forsterite ore). Background technique [0002] Silicate minerals (any one of serpentine ore, asbestos tailings, and forsterite ore) are a kind of minerals whose main chemical composition is silicon and magnesium, accompanied by iron, aluminum, nickel, cobalt and other elements. non-metallic minerals. Among them, the grades of magnesium oxide and iron oxide are respectively between 34-45% and 4-10%. Magnesium compounds such as magnesium carbonate, magnesium hydroxide, magnesium oxide, and magnesium silicate can be prepared by using magnesium in silicate minerals, and iron compounds such as ferrous oxalate, high-purity iron oxide, and iron-based industrial pigments can be prepared by using iron in them . ...

Claims

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Application Information

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IPC IPC(8): C01F5/40C01G49/14C01G49/06
Inventor 肖景波陈居玲夏娇彬
Owner 河南省睿博环境工程技术有限公司
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