阅读说明：本技术 一种红土型锐钛矿分离富集及氢氧化铝制备的方法 (Method for separating and enriching laterite type anatase and preparing aluminum hydroxide ) 是由 张松 王建蕊 徐磊 董光林 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种红土型锐钛矿分离富集及氢氧化铝制备的方法,包括如下步骤：S1,将红土型锐钛矿样和氢氧化钠按照一定比例混合,并用研钵研磨5～10分钟,混匀起到机械力活化作用,确保混合均匀；S2,将混匀的试样置于坩埚内,在一定温度下用马弗炉焙烧一定时间,恒温20分钟后取出冷却；S3,冷却后,将样品研磨后置于水中搅拌浸出40分钟,固液分离后得到滤渣1和滤液1；S4,将滤渣1与一定量的盐酸反应一定时间后反复洗涤得锐钛矿精矿；S5,往滤液1中逐滴滴入盐酸,待絮状物量最大时,过滤得到氢氧化铝。(The invention discloses a method for separating and enriching laterite anatase and preparing aluminum hydroxide, which comprises the following steps: s1, mixing the laterite-type anatase sample and sodium hydroxide according to a certain proportion, grinding for 5-10 minutes by using a mortar, and uniformly mixing to play a role in mechanical activation so as to ensure uniform mixing; s2, placing the uniformly mixed sample in a crucible, roasting the sample for a certain time at a certain temperature by using a muffle furnace, keeping the temperature for 20 minutes, taking out the sample and cooling the sample; s3, cooling, grinding the sample, placing the ground sample into water, stirring and leaching for 40 minutes, and performing solid-liquid separation to obtain filter residue 1 and filtrate 1; s4, reacting the filter residue 1 with a certain amount of hydrochloric acid for a certain time, and repeatedly washing to obtain anatase concentrate; s5, dropwise adding hydrochloric acid into the filtrate 1, and filtering to obtain aluminum hydroxide when the floc amount is maximum.)

1. The invention discloses a method for separating and enriching laterite anatase and preparing aluminum hydroxide, which comprises the following steps: s1, mixing the laterite-type anatase sample and sodium hydroxide according to a certain proportion, grinding for 5-10 minutes by using a mortar, and uniformly mixing to play a role in mechanical activation so as to ensure uniform mixing; s2, placing the uniformly mixed sample in a crucible, roasting the sample for a certain time at a certain temperature by using a muffle furnace, keeping the temperature for 20 minutes, taking out the sample and cooling the sample; s3, cooling, grinding the sample, placing the ground sample into water, stirring and leaching for 40 minutes, and performing solid-liquid separation to obtain filter residue 1 and filtrate 1; s4, reacting the filter residue 1 with 100ml of hydrochloric acid with certain concentration for a certain time, and repeatedly washing to obtain anatase concentrate; s5, dropwise adding hydrochloric acid into the filtrate 1, and filtering to obtain aluminum hydroxide when the floc amount is maximum.

2. The method for separating and enriching the laterite-type anatase and preparing the aluminum hydroxide according to claim 1, which is characterized by comprising the following steps of: the mass ratio of the laterite type anatase sample to the sodium hydroxide in S1 is 10: 5-10: 8.

3. The method for separating and enriching the laterite-type anatase and preparing the aluminum hydroxide according to claim 1, which is characterized by comprising the following steps of: and roasting the uniformly mixed sample in the S2 in a muffle furnace at the temperature of 350-600 ℃ for 25-40 min.

4. The method for separating and enriching the laterite-type anatase and preparing the aluminum hydroxide according to claim 1, which is characterized by comprising the following steps of: s3 the medium stirring intensity is 300-400 r.min^-1。

5. The method for separating and enriching the laterite-type anatase and preparing the aluminum hydroxide according to claim 1, which is characterized by comprising the following steps of: the concentration of hydrochloric acid at a certain concentration in S4 is determined according to the following formula: water 1: 1-4, and reacting with filter residue for 6-15 min.

6. The method for separating and enriching the laterite-type anatase and preparing the aluminum hydroxide according to claim 1, which is characterized by comprising the following steps of: the maximum floc amount in S5 is not reduced to critical point for dropwise addition of hydrochloric acid floc.

Technical Field

The invention belongs to the technical field of comprehensive utilization of mineral resources, and relates to a new method for separation and enrichment of laterite anatase and preparation of aluminum hydroxide.

Background

The laterite anatase is a weathered product formed by strong weathering of rocks under subtropical and tropical climatic conditions, has the characteristics of aluminum enrichment, iron enrichment, desilicication and the like, and generally has a chemical composition of Al₂O₃、SiO₂、Fe₂O₃And H₂The mineral composition mainly comprises anatase, kaolinite, hematite, limonite and the like, and has a lower silicon-aluminum-iron ratio or silicon-aluminum ratio. The method has great significance for the research and processing of the ores.

The titanium atom has small outer electron ionization potential, is easy to lose outer electrons, is easy to oxidize, can generate a compact nano-scale oxide film on the surface of the titanium metal, and has instant self-repairing capability after local damage, so the titanium and the titanium alloy have good corrosion resistance. In addition, although the strength of pure titanium is low, the strength of the commonly used titanium alloy is high, generally can reach the level of high-strength steel, and even higher strength, and is widely applied in the fields of aerospace, medical treatment, ships and warships and the like.

Disclosure of Invention

The invention aims to provide a method for separating and enriching laterite-type anatase and preparing aluminum hydroxide, wherein anatase in a sample is separated and enriched, the aluminum hydroxide is prepared, and a reasonable process flow is determined so as to improve the comprehensive utilization rate of ore and increase the added value of products.

The invention is realized in such a way, and mainly comprises the following steps:

s1, mixing the laterite-type anatase sample and sodium hydroxide according to a certain proportion, grinding for 5-10 minutes by using a mortar, and uniformly mixing to play a role in mechanical activation so as to ensure uniform mixing;

s2, placing the uniformly mixed sample in a crucible, roasting the sample for a certain time at a certain temperature by using a muffle furnace, keeping the temperature for 20 minutes, taking out the sample and cooling the sample;

s3, cooling, grinding the sample, placing the ground sample into water, stirring and leaching for 40 minutes, and performing solid-liquid separation to obtain filter residue 1 and filtrate 1;

s4, reacting the filter residue 1 with 100ml of hydrochloric acid with certain concentration for a certain time, and repeatedly washing to obtain anatase concentrate;

s5, dropwise adding hydrochloric acid into the filtrate 1, and filtering to obtain aluminum hydroxide when the floc amount is maximum.

Wherein:

the mass ratio of the laterite type anatase sample to the sodium hydroxide in S1 is 10: 5-10: 8.

And roasting the uniformly mixed sample in the S2 in a muffle furnace at the temperature of 350-600 ℃ for 25-40 min.

S3 the medium stirring intensity is 300-400 r.min^-1

The concentration of hydrochloric acid at a certain concentration in S4 is determined according to the following formula: water 1: 1-4, and reacting with filter residue for 6-15 min.

The hydrochloric acid in the S4 has the function of neutralizing residual alkali on one hand, and reacts with gangue minerals such as iron oxide and the like to generate soluble salts on the other hand, and the soluble salts can be washed.

S4, the filter residue 2 after washing is anatase ore concentrate.

The maximum floc amount in S5 is not reduced to critical point for dropwise addition of hydrochloric acid floc.

The method has the advantages of high leaching rate, simple operation, strong adaptability and reliability, and can recover anatase to prepare aluminum hydroxide and comprehensive byproducts such as orthosilicic acid and sodium silicate.

Drawings

FIG. 1 is a process flow diagram of a method for separating and enriching laterite-type anatase and preparing aluminum hydroxide.

Detailed Description

The invention is further described with reference to the following figures and specific examples.