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A method for preparing powdery iron-free polyaluminum chloride from calcium aluminate with high whiteness

A whiteness calcium aluminate, polyaluminum chloride technology, applied in aluminum chloride, aluminum halide and other directions, can solve the problems of unreachable, unstable heavy metal content, etc., and achieve the effect of high activity

Active Publication Date: 2015-10-28
淄博宝特化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of calcium aluminate raw materials, the content of heavy metals in the product is unstable, and it often fails to meet the standard requirements of "Polyaluminum Chloride for Drinking Water" (GB15892-2009)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate comprises the following raw materials and preparation steps:

[0022] (1) 1000g of aluminum hydroxide with a mass content of 64% of alumina and 1000g of calcite powder with a mass content of calcium carbonate of 98.5% and a whiteness of 91% were pre-fired at 850°C for 5 hours, cooled naturally to room temperature, and then respectively Grind it into 80 mesh powder to obtain active alumina 630g and 550g calcium oxide powder;

[0023] (2) Mix 550g of alumina powder, 350g of calcium oxide powder and 100g of coal powder with a calorific value of 7100kcal / kg from step (1) and mix evenly, add an appropriate amount of water and stir to form a spherical body, and then pass through the temperature of 1200°C Calcined for 6 hours, cooled naturally to normal temperature, and ground into a 100-mesh powder to obtain 900 g of high-whiteness calcium aluminate powder with an alumina ma...

Embodiment 2

[0026] The method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate comprises the following raw materials and preparation steps:

[0027] (1) 1000g of aluminum hydroxide with a mass content of 64.5% of alumina and 1000g of calcite powder with a mass content of calcium carbonate of 99% and a whiteness of 92% were pre-fired at 900°C for 4 hours, cooled naturally to room temperature, and then respectively Grind it into 100 mesh powder to obtain active alumina 645g and 550g calcium oxide powder;

[0028] (2) Take 600g of alumina powder obtained in step (1), 300g of calcium oxide powder and 100g of coal powder with a calorific value of 7100kcal / kg and mix evenly, add an appropriate amount of water and stir to form a spherical body, and then pass through the temperature of 1250°C Calcined for 5 hours, cooled naturally to room temperature, and ground into a 120-mesh powder to obtain 920 g of high-whiteness calcium aluminate powder with an alu...

Embodiment 3

[0031] The method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate comprises the following raw materials and preparation steps:

[0032] (1) 1000g of calcite powder with a mass content of 65% of alumina and a mass content of calcium carbonate of 99% and a whiteness of 91% was pre-fired at 950°C for 3 hours, then naturally cooled to room temperature, and then respectively It is ground into a 120-mesh powder to obtain 650g of active alumina and 550g of calcium oxide powder;

[0033] (2) Mix 580g of alumina powder, 320g of calcium oxide powder and 100g of coal powder with a calorific value of 7100kcal / kg obtained in step (1) and mix evenly, add an appropriate amount of water and stir to form a spherical body, and then pass through the temperature of 1300°C Calcined for 4 hours, cooled naturally to room temperature, and ground into a 180-mesh powder to obtain 900 g of high-whiteness calcium aluminate powder with an alumina mass content of...

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Abstract

The invention discloses a method for preparing powdery iron-free polyaluminum chloride from high-whiteness calcium aluminate. The method comprises the following steps: (1) respectively presintering aluminum hydroxide and calcite powder at high temperature, naturally cooling, and grinding to obtain aluminum oxide powder and calcium oxide powder; (2) proportionally and evenly mixing the aluminum oxide powder and calcium oxide powder with high-heating-value coal powder to obtain spheres, calcining at high temperature, naturally cooling, and grinding to obtain high-whiteness calcium aluminate powder; and (3) adding the calcium aluminate powder as a basicity regulator into an iron-free aluminum chloride solution to react, adding high-purity aluminum to remove iron to obtain an iron-free polyaluminum chloride liquid, and carrying out spray drying on the liquid polyaluminum chloride to obtain the powdery iron-free polyaluminum chloride. The powdery iron-free polyaluminum chloride has the advantages of favorable coagulation effect, low heavy metal content, satisfactory residual aluminum content in the treated effluent water, and low production cost; and other quality indexes can satisfy the standard requirements in Polyaluminum Chloride for Domestic Drinking Water (GB15892-2009).

Description

technical field [0001] The invention relates to the field of inorganic aluminum salt water purifiers, in particular to a method for preparing powdery iron-free polyaluminum chloride from calcium aluminate with high whiteness. Background technique [0002] Polyaluminum chloride has the advantages of good drug effect, less dosage, convenient use, and low price. It has become one of the most widely used water purifiers for domestic drinking water treatment in my country. The Chinese government and the public are paying more and more attention to the safety of drinking water, and the requirements are becoming stricter and stricter. The national "Drinking Water Hygienic Standards" (GB 5749-2006) stipulates the control standards for heavy metals such as arsenic, cadmium, chromium (hexavalent), mercury, lead, etc., and revised arsenic, cadmium , lead and other heavy (type) metal indicators. Correspondingly, "Polyaluminum Chloride for Drinking Water" (GB15892-2009) also stipulates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/56
Inventor 王琼晏永祥刘国兴徐杰刘春华黄亚许
Owner 淄博宝特化工科技有限公司