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Technology using calcium and magnesium mud purified by brine to produce magnesium sulfate and calcium sulfate

A brine purification, calcium carbonate technology, applied in the direction of magnesium sulfate, calcium carbonate/strontium/barium, alkali metal sulfite/sulfite, etc., can solve the problems of environmental pollution, calcium magnesium mud not comprehensive utilization, etc., to achieve technological Continuous and concise, strong adaptability of raw materials, low production cost

Inactive Publication Date: 2017-05-31
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] known as NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine purification process to remove magnesium sulfate, calcium sulfate impurities: use NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine and caustic soda (NaOH), soda ash (Na 2 CO 3 ) reaction to remove magnesium sulfate and calcium sulfate impurities, referred to as caustic soda-soda ash method; yet, the above-mentioned caustic soda-soda ash method has the problem that calcium magnesium mud is not comprehensively utilized and causes environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: take 100m 3 NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine (Na 2 SO 4 30g / l, NaCl 300g / l, CaSO 4 1.5g / l, MgSO 4 1.0g / l) and 0.54m 3 Freezing and cooling magnesium mother liquor (MgSO 4 264g / l) mixed brine as raw material, adding caustic soda (NaOH) and soda ash (NaOH) to the brine 2 CO 3 ) to carry out continuous reaction (reaction temperature 25 ℃, reaction pressure normal pressure, reaction time 2 hours) to remove Ca 2+ , Mg 2+ Ions produce magnesium hydroxide (Mg(OH) 2 ) and calcium carbonate (CaCO 3 ) sediment and 100.54m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l); Solid-liquid separation obtains 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium carbonate (CaCO 3 ) sediment, 100.54m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l) clarified liquid; 100.54m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l) clarified liquid to produce salt salt system; 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium ...

Embodiment 2

[0026] Embodiment 2: take 100m 3 NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine (Na 2 SO 4 30g / l, NaCl 300g / l, CaSO 4 1.5g / l, MgSO 4 1.0g / l) and 1.01m 3 Freezing and cooling magnesium mother liquor (MgSO 4 326g / l) mixed brine as raw material, adding caustic soda (NaOH) and soda ash (NaOH) to the brine 2 CO 3 ) for continuous reaction (reaction temperature 30°C, reaction pressure normal pressure, reaction time 2 hours) to remove Ca 2+ , Mg 2+ Ions produce magnesium hydroxide (Mg(OH) 2 ) and calcium carbonate (CaCO 3 ) sediment and 101.01m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l); Solid-liquid separation obtains 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium carbonate (CaCO 3 ) sediment, 101.01m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l) clarified liquid; 101.01m 3 Refined brine (Na 2 SO 4 30g / l, NaCl 300g / l) clarified liquid to produce salt salt system; 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium carbonate...

Embodiment 3

[0027] Embodiment 3: take 100m 3 NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H2O system brine (Na 2 SO 4 300g / l, NaCl 30g / l, CaSO 4 1.5g / l, MgSO 4 1.0g / l) as raw material, add caustic soda (NaOH) and soda ash (NaOH) into the brine 2 CO 3 ) to carry out continuous reaction (reaction temperature 25 ℃, reaction pressure normal pressure, reaction time 2 hours) to remove Ca 2+ , Mg 2+ Ions produce magnesium hydroxide (Mg(OH) 2 ) and calcium carbonate (CaCO 3 ) sediment and 100m 3 Refined brine (Na 2 SO 4 300g / l, NaCl 30g / l); Solid-liquid separation obtains 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium carbonate (CaCO 3 ) sediment, 100m 3 Refined brine (Na 2 SO 4 300g / l, NaCl 30g / l) clarified liquid; 100m 3 Refined brine (Na 2 SO 4 300g / l, NaCl 30g / l) clarified liquid to produce salt salt system; 48.3kg magnesium hydroxide (Mg(OH) 2 ) and 110.3kg calcium carbonate (CaCO 3 ) The precipitate was added with 118.6kg of sulfuric acid (H 2 SO 4 70%) and 108...

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PUM

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Abstract

The invention relates to a technology using calcium and magnesium mud purified by brine to produce magnesium sulfate and calcium sulfate. The technology comprises the following steps of sequentially adding caustic soda and pure soda into raw materials to remove Ca<2+> and Mg<2+>, so as to simultaneously obtain a magnesium hydroxide and calcium sulfate precipitate and refined brine; separating soil and liquid, so as to obtain a magnesium hydroxide and calcium sulfate mixing precipitate and a refined brine clarifying liquid; sending the refined brine clarifying liquid into a sodium nitrate production system; adding sulfuric acid and water into the magnesium hydroxide and calcium sulfate mixing precipitate, and reacting with magnesium hydroxide, so as to obtain a magnesium sulfate solution and a calcium sulfate precipitate; separating solid and liquid, so as to obtain a magnesium sulfate clarifying liquid and the calcium sulfate precipitate; freezing and cooling the magnesium sulfate clarifying liquid, so as to obtain magnesium sulfate heptahydrate and a freezing and cooling magnesium mother liquid; or, evaporating at high temperature, so as to obtain magnesium sulfate monohydrate; cycling the freezing and cooling magnesium mother liquid to a sulfuric acid and water reaction system; washing the calcium sulfate precipitate by fresh water, and drying, so as to obtain a calcium carbonate product. The technology has the advantages that the product quality is high, the suitability of raw materials is high, the technology is continuous and concise, the cost is low, and the environment-friendly effect is realized.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a process for producing magnesium sulfate and calcium carbonate by using calcium-magnesium mud in brine purification. Background technique [0002] known as NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine purification process to remove magnesium sulfate, calcium sulfate impurities: use NaCl-Na 2 SO 4 -Ca 2+ , Mg 2+ -H 2 O system brine and caustic soda (NaOH), soda ash (Na 2 CO 3 ) reaction to remove magnesium sulfate, calcium sulfate impurities, referred to as caustic soda-soda ash method; yet, the above-mentioned caustic soda-soda ash method has the problem that calcium magnesium mud is not comprehensively utilized and causes environmental pollution. Therefore, a process with high utilization rate of raw materials is needed to solve the above problems. Contents of the invention [0003] The purpose of the present invention is to provide a proc...

Claims

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Application Information

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IPC IPC(8): C01F5/40C01F11/18C01D3/06C01D5/00
CPCC01F5/40C01D3/06C01D5/00C01F11/18C01P2006/80
Inventor 彭赛军王明柱朱晓峰阙勇魏禄聚戴时敏
Owner CHINA LIGHT IND INT ENG CO LTD
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