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Method for recovering sodium sulfate from white carbon black feed liquid

A technology of white carbon black and sodium sulfate, applied in the direction of alkali metal sulfite/sulfate purification, etc., can solve problems such as high cost and poor salt benefit

Active Publication Date: 2021-06-29
SICHUAN SIDANENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for reclaiming sodium sulfate from white carbon black feed liquid, to solve the technical problems of high cost and poor salt benefit in the treatment of white carbon black feed liquid in the prior art

Method used

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  • Method for recovering sodium sulfate from white carbon black feed liquid
  • Method for recovering sodium sulfate from white carbon black feed liquid
  • Method for recovering sodium sulfate from white carbon black feed liquid

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Embodiment 1

[0034] This embodiment provides the first specific implementation of the treatment method of the white carbon black feed liquid and the first specific implementation of the treatment system of the white carbon black feed liquid, wherein the white carbon black feed liquid is produced by the precipitation method In the process of preparing white carbon black, it is specifically the filtrate and washing water of plate and frame filtration of the acidification reaction feed liquid.

[0035] The processing method of white carbon black material liquid comprises steps:

[0036] (1) filtering the white carbon black material liquid to obtain a filtrate with SDI≤5;

[0037] (2) carry out membrane concentration to filtrate, obtain the membrane concentrate of sodium sulfate content ≥ 180g / L;

[0038] Wherein, the step (1) comprises: adopting the first filter medium with the interception rate ≥ 97% to the particles with a particle size ≥ 3nm to carry out primary filtration to the white ca...

Embodiment 2

[0050] This embodiment provides the second specific implementation of the treatment method of the white carbon black feed liquid and the second specific implementation of the treatment system of the white carbon black feed liquid, wherein the white carbon black feed liquid is produced by the precipitation method In the process of preparing white carbon black, it is specifically the filtrate and washing water of plate and frame filtration of the acidification reaction feed liquid.

[0051] Compared with Example 1, the difference is that step (1) includes in the treatment method of the silica feed liquid of the present embodiment:

[0052] Step1: Use the second filter medium with an interception rate of ≥99% for particles with a particle size ≥30nm to perform secondary filtration on the silica feed liquid to obtain a secondary filtrate with a turbidity ≤10NTU; the second filter medium is made of titanium-based metal filter element;

[0053] Step2: Use the first filter medium wi...

Embodiment 3

[0058] This embodiment provides the third specific implementation of the treatment method of the white carbon black feed liquid and the third specific implementation of the treatment system of the white carbon black feed liquid, wherein the white carbon black feed liquid is produced by the precipitation method In the process of preparing white carbon black, it is specifically the filtrate and washing water of plate and frame filtration of the acidification reaction feed liquid.

[0059] Compared with Example 2, the difference is that the treatment method of the white carbon black feed liquid of this embodiment further includes step (3): evaporating and concentrating the membrane concentrate to obtain an evaporation concentrate with a sodium sulfate content of 280-320 g / L .

[0060] image 3 It is a structural schematic diagram of the treatment system of the white carbon black material liquid of this embodiment. like image 3 As shown, compared with Example 2, the treatment ...

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Abstract

The invention discloses a method for recovering sodium sulfate from white carbon black feed liquid. The method comprises the following steps: (1) filtering a white carbon black feed liquid to obtain filtrate with SDI less than or equal to 5; (2) performing membrane concentration on the filtrate to obtain a membrane concentrated solution with the sodium sulfate content being greater than or equal to 180 g / L; (3) evaporating and concentrating the membrane concentrated solution to obtain an evaporated concentrated solution with the content of sodium sulfate being greater than or equal to 280 g / L; and (4) separating out sodium sulfate in the evaporation concentrated solution to obtain sodium sulfate. According to the method disclosed by the invention, residual silicon dioxide in the white carbon black feed liquid is effectively recovered in a filtering manner, the loss and pollution of granular silicon dioxide are reduced, the pretreatment investment is reduced, and the stability and economic benefits of the process are improved; through verification, compared with the mode of pure evaporation and concentration, the mode of combining membrane concentration and evaporation and concentration can reduce the evaporation capacity by 75-85%, so that the evaporation cost is reduced by more than 50%; and the sodium sulfate finally obtained by the method is high in purity and can be sold, and salt benefits are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of resource recovery in white carbon black feed liquid, in particular to, specifically, a method for recovering sodium sulfate from white carbon black feed liquid. Background technique [0002] Silica particles are also called white carbon black. The production of white carbon black is generally produced by chemical precipitation method, that is, using quartz stone, biomass and other materials as raw materials, firstly, sodium silicate solution (also known as sodium silicate) is formed by alkali dissolution, and the residue is removed by filtration (primary filtration), and the filtrate After adding dilute sulfuric acid (usually 8 to 10%) to neutralize and form amorphous silica particles (ie, acidification reaction feed liquid), and finally filter (secondary filter), wash, and dry to obtain white carbon with a low moisture content Black finished product; Among them, secondary filtration will produce more hi...

Claims

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Application Information

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IPC IPC(8): C01D5/16
CPCC01D5/16C01P2006/80
Inventor 何志许锦鹏肖松林
Owner SICHUAN SIDANENG ENVIRONMENTAL PROTECTION TECH CO LTD
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