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Method for preparing boric acid from ulexite

A technology of sodium borate and boric acid, which is applied in the field of inorganic chemistry and can solve problems such as the lack of methods for preparing boric acid

Inactive Publication Date: 2017-03-08
泰誉威(天津)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the technical defects of the prior art, and provides a method for preparing boric acid with sodium borate ore as raw material, so as to solve the problem in the prior art that there is no method for preparing boric acid with sodium borate ore as raw material. technical problem

Method used

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  • Method for preparing boric acid from ulexite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Raw material composition analysis of sodium borate ore

[0037] Sodium borate ore is in powder form, and its composition content is as follows: B 2 o 3 32.94%, CaO 12.67%, MgO 1.03%, Cl 5.22%, moisture 16.73%.

[0038] Among them, the acid-insoluble content is 4%, and the approximate mineral composition is calculated as follows: NaCaB 5 o 9 ·8H 2 O content 76.6%, MgCl 2.44%, CaCO 3 3.75%, NaCl 5.61%, free water 7.6% (16.73%-7.6%=9.13% difference from the measured value, in fact, crystal water is released at 105°C or 110°C).

[0039] CaO in minerals is here referred to as NaCaB 5 o 9 ·8H 2 O and CaCO 3 In fact, it is also possible to calculate the existence of the form as CaCl 2 or CaSO 4 2H 2 The O form exists, but according to the bubble (colloid) situation, CaCO 3 Definitely the main form.

[0040]2, a kind of method that boric acid is prepared as raw material with sodium borate ore, comprises the following steps (technical process such as figure 1...

Embodiment 2

[0048] A method for preparing boric acid as raw material with sodium borate ore, comprising the following steps:

[0049] 1) Take powdery sodium borate ore and mix it with concentrated sulfuric acid, and react in the range of 95-105°C;

[0050] 2) solid-liquid separation to get the supernatant;

[0051] 3) cooling and crystallizing the supernatant described in step 2);

[0052] 4) solid-liquid separation to get precipitation;

[0053] 5) Take the precipitate described in step 4) and dry it to obtain the boric acid product.

[0054] On the basis of the above technical solutions, the following conditions are met:

[0055] The reaction temperature described in step 1) is 100°C.

[0056] In step 1), perform step 2) after the reaction is complete within the range of 95-105°C.

[0057] The reaction time in step 1) is 8-10 hours.

[0058] During the reaction in step 1), the mixture of powdery sodium borate ore and concentrated sulfuric acid is in a stirring state.

[0059] The...

Embodiment 3

[0065] A method for preparing boric acid as raw material with sodium borate ore, comprising the following steps:

[0066] 1) Take powdery sodium borate ore and mix it with concentrated sulfuric acid, and react in the range of 95-105°C;

[0067] 2) solid-liquid separation to get the supernatant;

[0068] 3) cooling and crystallizing the supernatant described in step 2);

[0069] 4) solid-liquid separation to get precipitation;

[0070] 5) Take the precipitate described in step 4) and dry it to obtain the boric acid product.

[0071] On the basis of the above technical solutions, the following conditions are met:

[0072] The reaction temperature described in step 1) is 100°C.

[0073] In step 1), perform step 2) after the reaction is complete within the range of 95-105°C.

[0074] The solid-liquid separation described in step 2) is to utilize plate and frame filter to filter.

[0075] Step 3) Adjust the pH during the cooling and crystallization process so that the pH of t...

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Abstract

The invention provides a method for preparing boric acid from ulexite. The technical scheme includes that the method includes the technological process of acidolysis, crystallization, washing and drying, and production efficiency is improved by optimization of reaction conditions and process operation. The method includes the steps of 1), enabling concentrated sulfuric acid and ulexite powder to react as sufficiently as possible; 2), performing solid-liquid separation to remove CaSO4 2H2O, CaSO4 MgSO4 composite salt and sediment carried in ore; 3), cooling for crystallizing to separate out a boric acid coarse product, observing pH value change of the boric acid coarse product at different temperatures in the process, and properly adjusting a pH value to better control granularity and whiteness of the product; 4), performing solid-liquid separation to collect the solid boric acid coarse product, using water to wash the coarse product, and returning washing liquid to the first process to increase yield. The method is simple and convenient to operate, high in product purity, needless of adjusting process conditions according to types and content of impurities and especially suitable for production on a large scale higher than ten thousand tons.

Description

technical field [0001] The invention relates to the technical field of inorganic chemistry, and further relates to a large-scale production method of boric acid, in particular to a method for preparing boric acid using sodium borate ore as a raw material. Background technique [0002] Naborite is a borate mineral, which occurs in arid regions and is formed after boron in sediments and volcanic debris is washed out by water. The crystals of sorborite are colorless and transparent with a glassy luster. The chemical formula of its pure product is NaCa[B 3 B 2 o 7 (OH) 4 ]·6H 2 O, the theoretical composition is about: Na 2 O 7.65%, CaO 13.85%, B 2 o 3 42.95%, H 2 O35.55%. In the microscopic state, it is triclinic, a0=0.881nm, b0=1.286nm, c0=0.668nm, α=90°15', β=109°10', γ=105°05'; Z=2. [0003] In the natural state, sodium borate ore generally exists in the state of crystal aggregates. In addition to sodium borate, it is also mixed with other mineral components, ofte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10
CPCC01B35/1045
Inventor 耿振友
Owner 泰誉威(天津)新材料科技有限公司
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