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High-quality hydrolysis scale recycling method

A scale-removing, high-quality technology, applied in the direction of titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of high recovery cost, low titanium recovery rate, long process flow, etc.

Pending Publication Date: 2020-07-24
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has practical problems such as high recovery cost, long process flow, and low titanium recovery rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 150g of hydrolyzed scale, add 150g of zirconium beads with a diameter of 8-12mm, add 100mL of water, ball mill for 100min, sieve through a mesh of 325 and above, and rinse the undersize suspension once. The specific operations include: Mass meter, beating the depolymerized material to a concentration of 300g / L, adding sulfuric acid first, controlling the concentration of sulfuric acid in the rinsing slurry to be 80g / L, then adding trivalent titanium, controlling the concentration of trivalent titanium in the rinsing slurry to be 2g / L, and then Washing with water, controlling the amount of washing water to be 10 times the mass of titanium dioxide, removes most of the iron and other colored impurities, and obtains metatitanic acid after one rinse. After the primary rinsing, the metatitanic acid is beaten with water, based on the amount of titanium dioxide, 8 wt% of barium chloride is added for depolymerization, precipitation, centrifugation, and calcined seeds and tr...

Embodiment 2

[0029] Same as Example 1, the difference lies in: based on the amount of titanium dioxide, the added amount of barium chloride is 10wt%.

Embodiment 3

[0031] Same as Example 1, the difference lies in: based on the amount of titanium dioxide, the added amount of barium chloride is 12wt%.

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Abstract

The invention belongs to the technical field of titanium dioxide production, and discloses a high-quality hydrolysis scale recycling method, which comprises: 1) mechanical depolymerization: mixing hydrolysis scale and a ball milling medium, adding water, carrying out wet ball milling, and filtering by using a sieve with a size of more than or equal to 325 meshes to obtain a mechanical depolymerization material; 2) primary purification: carrying out primary rinsing on the mechanical depolymerized material to obtain primarily-rinsed metatitanic acid; 3) chemical depolymerization: pulping the primarily-rinsed metatitanic acid, adding 8-20wt% of a soluble barium salt, and carrying out solid-liquid separation to obtain a chemical depolymerized material; 4) secondary purification: carrying out secondary rinsing on the chemical depolymerized material to obtain secondarily-rinsed metatitanic acid ; and 5) recycling: directly carrying out subsequent treatment on the secondarily-rinsed metatitanic acid, or carrying out subsequent treatment after blending the secondarily-rinsed metatitanic acid with a hydrolysis secondary washing cake so as to obtain rutile titanium dioxide. The method disclosed by the invention can realize high-quality recycling of the hydrolysis scale, increase economic benefits and reduce production cost.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a method for high-quality recovery and utilization of hydrolyzed scale. Background technique [0002] In the production process of titanium dioxide by sulfuric acid method, due to many factors such as the equipment design of the hydrolysis pot, the material of the pot wall and the washing equipment in the hydrolysis process, 50-100 cm of hydrolyzed solid phase is adhered to the inner wall of the hydrolysis pot, which is also called hydrolysis scale, because its Hard structure, high iron content, many calcium impurities, difficult to depolymerize, difficult to recycle. [0003] The current conventional treatment methods for hydrolyzed scale include: pile up the landfill with titanium gypsum and discard it directly; or sell it cheaply to downstream industries with low titanium quality requirements, which reduces the pressure on environmental protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCC01G23/047C01P2006/65C01P2006/62C01P2002/30
Inventor 林发蓉杜国华曹鹏熊怀忠张小倩周春勇吴彭森和奔流孙世杰
Owner SICHUAN LOMON TITANIUM IND CO LTD