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Production of acqueous talc from brine

A technology of hydrotalcite and bittern, which is applied in the field of preparation of hydrotalcite, can solve the problem of unreasonable utilization of bittern, achieve strong adsorption, simple process, and low price

Inactive Publication Date: 2005-07-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many technical solutions for comprehensive utilization [1-4], due to factors such as cost and benefit, there are still a considerable amount of bittern that has not been rationally utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The first method for preparing hydrotalcite proposed by the present invention is to use salt-making bittern as the source of divalent metal elements, i.e. magnesium, and use laterite-type bauxite acid-dissolved ore pulp as the source of trivalent metal elements aluminum and iron. Reaction and crystallization to synthesize hydrotalcite. The main mineral composition of lateritic bauxite is gibbsite, followed by goethite and hematite. This type of bauxite has a loose structure and strong chemical activity, and is easily dissolved by inorganic acids such as hydrochloric acid, nitric acid, and sulfuric acid. Considering environmental and cost factors, hydrochloric acid is recommended. Due to the presence of ferric iron, the hydrotalcite synthesized from laterite-type bauxite is reddish. The ratio of divalent metal elements and trivalent metal elements in the additive has a certain influence on the performance of the final product. Generally speaking, when the amount of the...

Embodiment 1

[0051] Example 1: Preparation of hydrotalcite from salt lake bittern and bauxite acid-dissolved pulp.

[0052] Raw material 1: bittern from a salt lake in a certain place, the chemical composition is: MgSO 4 =70g / L, MgCl 2 =165g / L, NaCl=90g / L, KCl=20g / L. Raw material 2: laterite-type bauxite in a certain place, the chemical composition of the ore is: Al 2 o 3 = 48%; Fe 2 o 3 = 16; SiO 2 = 7%, TiO 2 = 3%, water of crystallization = 24%, other impurities = 2%.

[0053] 1) Weigh 175 grams of laterite-type bauxite, grind it into powder, add 6.5 liters of 1N hydrochloric acid, stir until the mineral powder is basically dissolved, filter out the residue, add 1.3 liters of bittern, stir evenly, and record it as solution A;

[0054] 2) Weigh 90 grams of NaOH and 120 grams of NaOH 2 CO 3 Dissolve in 2 liters of water, stir until the solute is completely dissolved, and record it as solution B;

[0055] 3) Stir solution A vigorously, quickly pour solution B into solution A whi...

Embodiment 2

[0057] Example 2: Preparation of hydrotalcite from sea salt bittern and bauxite acid-dissolved pulp.

[0058] Raw material 1: sea salt bittern from a certain place, chemical composition: MgSO 4 =116g / L, MgCl 2 =311g / L, NaCl=52g / L, KCl=5g / L. Raw material 2: laterite-type bauxite in a certain place, the chemical composition of the ore is the same as in Example 1.

[0059] 1) Weigh 175 grams of laterite-type bauxite, grind it into powder, add 1.5 liters of hydrochloric acid with a concentration of 4N, stir until the ore powder is basically dissolved, filter out the residue, add 0.7 liters of bittern, then add 15 liters of water, stir evenly, Recorded as solution A;

[0060] 2) Weigh 100 grams of NaOH and 100 grams of NaHCO 3 Dissolve in 4 liters of water, stir until the solute is completely dissolved, and record it as solution B;

[0061] 3) Stir solution A vigorously, quickly pour solution B into solution A while stirring, and continue stirring for 5 minutes;

[0062] 4) T...

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Abstract

Production of hydrotalcite by salt-making bittern is carried out by mixing bittern, bauxite acid dissolving or basic dissolving pulp with red mud, crystallizing, washing, and drying to obtain hydrotalcite. It can be used as catalyst and catalyst carrier in chemical field, as infrared or ultraviolet absorbing material in functional material field,etc., and sewage treatment and pollution prevention. It achieves simple process and low cost.

Description

technical field [0001] The invention relates to a method for preparing hydrotalcite from salt-making bittern. Background technique [0002] Salt-making bittern is the evaporation and concentration of seawater, salt lake water, and underground salt brine to produce table salt (NaCl) or Glauber's salt (NaCl). 2 SO 4 10H 2 O) after residual solution, the dissolved component that it contains is mainly MgCl 2 , followed by MgSO 4 , NaCl and KCl, in addition to MgBr 2 and other trace components, see references [1-3] for details. After seawater or brine from other sources is evaporated by sunlight to obtain NaCl, it is difficult to further concentrate by evaporation due to the high viscosity and strong hygroscopicity of the solution. Although there are many technical solutions for comprehensive utilization [1-4], due to factors such as cost and benefit, there are still a considerable amount of bittern that has not been rationally utilized. [0003] Hydrotalcite, also known a...

Claims

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Application Information

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IPC IPC(8): C01G1/02
Inventor 叶瑛季珊珊邬黛黛黄霞陈志飞李俊张维睿
Owner ZHEJIANG UNIV
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