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Process for recovering boric acid and magnesium sulfate from boric acid mother liquor

A technology of magnesium sulfate and boric acid mother, applied in the direction of magnesium sulfate, boron oxide, energy input, etc., can solve problems such as low production efficiency, unsuitability for large-scale production, and impact on the quality of boric acid products, so as to improve production efficiency and reduce energy consumption. The effect of reducing consumption and reducing corrosion

Active Publication Date: 2015-09-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are the following problems in this process: 1. Concentration adopts solar energy direct evaporation, the production efficiency is low, and it is not suitable for large-scale production; 2. Adding flotation agent in flotation will inevitably have a certain impact on the quality of the product boric acid

Method used

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  • Process for recovering boric acid and magnesium sulfate from boric acid mother liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The mother liquor pool (1) contains mother liquor containing 4% boric acid and 13% magnesium sulfate (mass), with a treatment capacity of 6000kg / h, which is preheated to 75°C, and then enter the first-effect separation chamber (5), through the first-effect circulation pump (11), the mother liquor is sent to the first-effect heating chamber (4) for heating and evaporation, the boiling point temperature of the solution is controlled at 100°C, and the concentration of magnesium sulfate reaches 20%. , the gas-liquid separation is carried out in the first-effect separation chamber (5); the separated liquid enters the second-effect separation chamber (7) by the pressure difference between the two effects, and the mother liquor is pumped into the second-effect heating chamber by the second-effect circulating pump (12) (6) Heating and evaporating, the boiling point temperature of the solution is controlled at 80°C, the concentration of magnesium sulfate reaches 26%, and the ...

Embodiment 2

[0027] The mother liquor pool (1) contains mother liquor containing 3% boric acid and 15% magnesium sulfate, with a treatment capacity of 10,000kg / h, preheated to 70°C by the exhaust steam preheater (2) and condensed water preheater (3), Then it enters the first-effect separation chamber (5), and the mother liquor is sent to the first-effect heating chamber (4) for heating and evaporation through the first-effect circulating pump (11). The separated liquid enters the second-effect separation chamber (7) by the pressure difference between the two effects, and the mother liquor is sent to the second-effect heating chamber (6) by the second-effect circulating pump (12). Heating and evaporation, the boiling point temperature of the solution is controlled at 85°C, the concentration of magnesium sulfate reaches 26%, and the gas-liquid separation is carried out in the second-effect separation chamber (7); the separated liquid enters the third-effect separation chamber (9) by the p...

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Abstract

The invention relates to a process for recycling boric acid and magnesium sulfate from a boric acid mother solution. The heat is fully utilized by adopting multi-effect heat pump vacuum evaporation. The process comprises the following steps: entering the boric acid mother solution into a multi-effect evaporator to concentrate to obtain 380-420g / L of magnesium sulfate, crystallizing in a cooling crystallizer, performing gravity stratification on the crystallization solution, wherein the upper layer is the boric acid solution, and the lower layer is the magnesium sulfate solution; performing centrifugal separation on the upper boric acid solution in a centrifugal machine, entering allowing the crystal into a dryer, wherein the drying temperature is 100-130 DEG C, packaging the finished product, returning the boric acid mother solution to a boric acid evaporator for concentrating again; performing centrifugal separation on the lower magnesium sulfate solution in another centrifugal machine, entering the crystal into the dryer at the drying temperature is 110-150 DEG C, thereby obtaining magnesium sulfate monohydrate, and packaging the finished product. According to the process, the magnesium sulfate monohydrate with high value is prepared, the recycling rate of the boric acid is improved, the magnesium sulfate is recycled, the process is high in production efficiency, adapts to large-scale production and has high economic benefits and social benefits, the pollution of the boric acid mother solution on the environment is avoided, and the cost is reduced.

Description

technical field [0001] The invention relates to boric acid mother liquor treatment, in particular to a process for recovering boric acid and magnesium sulfate from boric acid mother liquor. Background technique [0002] Boric acid is an important inorganic chemical basic raw material, which occupies an important position in the development of national economy and industrial and agricultural production. The processing of boron ore resources adopts different processing methods according to the different raw materials. At present, boron-magnesium ore is widely mined and utilized in our country. The processing method of boron-magnesium ore mainly adopts the sulfuric acid method, and the yield of this method is only 70% to 72%. For every 1 ton of boric acid produced, 4 to 6 tons of mother liquor is discharged. The concentration of boric acid in the mother liquor is about 3%, and the concentration of magnesium sulfate is about 20%. A large amount of discharged mother liquor not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01F5/40
CPCY02P20/129
Inventor 胡柏松邓会宁赵景利
Owner HEBEI UNIV OF TECH
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